Add recently connected state to core and UI.

.idea/codeStyles/Project.xml

@@ -1,5 +1,8 @@
 <component name="ProjectCodeStyleConfiguration">
   <code_scheme name="Project" version="173">
+    <AndroidXmlCodeStyleSettings>
+      <option name="ARRANGEMENT_SETTINGS_MIGRATED_TO_191" value="true" />
+    </AndroidXmlCodeStyleSettings>
     <JavaCodeStyleSettings>
       <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
       <option name="IMPORT_LAYOUT_TABLE">

TRANSLATION.md

@@ -1,9 +0,0 @@
-Translations for this project are managed through Transifex:
-
-https://transifex.com/otf/briar
-
-If you'd like to volunteer as a translator, please create a Transifex account and request to be
-added to the project's translation team. The Localization Lab has some instructions and advice for
-translators here:
-
-https://wiki.localizationlab.org/index.php/Briar

bramble-android/build.gradle

@@ -11,8 +11,8 @@ android {
 	defaultConfig {
 		minSdkVersion 16
 		targetSdkVersion 28
-		versionCode 10209
+		versionCode 10207
-		versionName "1.2.9"
+		versionName "1.2.7"
 		consumerProguardFiles 'proguard-rules.txt'
 
 		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

bramble-android/src/main/AndroidManifest.xml

@@ -16,8 +16,6 @@
 		android:label="@string/app_name"
 		android:supportsRtl="true">
 
-		<receiver android:name=".system.AlarmReceiver" />
-
 	</application>
 
 </manifest>

bramble-android/src/main/java/org/briarproject/bramble/BrambleAndroidModule.java

@@ -6,8 +6,6 @@ import org.briarproject.bramble.plugin.tor.CircumventionModule;
 import org.briarproject.bramble.reporting.ReportingModule;
 import org.briarproject.bramble.socks.SocksModule;
 import org.briarproject.bramble.system.AndroidSystemModule;
-import org.briarproject.bramble.system.AndroidTaskSchedulerModule;
-import org.briarproject.bramble.system.AndroidWakefulIoExecutorModule;
 
 import dagger.Module;
 
@@ -15,8 +13,6 @@ import dagger.Module;
 		AndroidBatteryModule.class,
 		AndroidNetworkModule.class,
 		AndroidSystemModule.class,
-		AndroidTaskSchedulerModule.class,
-		AndroidWakefulIoExecutorModule.class,
 		CircumventionModule.class,
 		ReportingModule.class,
 		SocksModule.class

bramble-android/src/main/java/org/briarproject/bramble/BrambleAppComponent.java

@@ -1,8 +0,0 @@
-package org.briarproject.bramble;
-
-import org.briarproject.bramble.api.system.AlarmListener;
-
-public interface BrambleAppComponent {
-
-	AlarmListener alarmListener();
-}

bramble-android/src/main/java/org/briarproject/bramble/BrambleApplication.java

@@ -1,6 +0,0 @@
-package org.briarproject.bramble;
-
-public interface BrambleApplication {
-
-	BrambleAppComponent getBrambleAppComponent();
-}

bramble-android/src/main/java/org/briarproject/bramble/api/system/AlarmListener.java

@@ -1,11 +0,0 @@
-package org.briarproject.bramble.api.system;
-
-import android.content.Intent;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface AlarmListener {
-
-	void onAlarm(Intent intent);
-}

bramble-android/src/main/java/org/briarproject/bramble/api/system/AndroidWakeLock.java

@@ -1,19 +0,0 @@
-package org.briarproject.bramble.api.system;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface AndroidWakeLock {
-
-	/**
-	 * Acquires the wake lock. This has no effect if the wake lock has already
-	 * been acquired.
-	 */
-	void acquire();
-
-	/**
-	 * Releases the wake lock. This has no effect if the wake lock has already
-	 * been released.
-	 */
-	void release();
-}

bramble-android/src/main/java/org/briarproject/bramble/api/system/AndroidWakeLockManager.java

@@ -1,38 +0,0 @@
-package org.briarproject.bramble.api.system;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.concurrent.Executor;
-
-@NotNullByDefault
-public interface AndroidWakeLockManager {
-
-	/**
-	 * Creates a wake lock with the given tag. The tag is only used for
-	 * logging; the underlying OS wake lock will use its own tag.
-	 */
-	AndroidWakeLock createWakeLock(String tag);
-
-	/**
-	 * Runs the given task while holding a wake lock.
-	 */
-	void runWakefully(Runnable r, String tag);
-
-	/**
-	 * Submits the given task to the given executor while holding a wake lock.
-	 * The lock is released when the task completes, or if an exception is
-	 * thrown while submitting or running the task.
-	 */
-	void executeWakefully(Runnable r, Executor executor, String tag);
-
-	/**
-	 * Starts a dedicated thread to run the given task asynchronously. A wake
-	 * lock is acquired before starting the thread and released when the task
-	 * completes, or if an exception is thrown while starting the thread or
-	 * running the task.
-	 * <p>
-	 * This method should only be used for lifecycle management tasks that
-	 * can't be run on an executor.
-	 */
-	void executeWakefully(Runnable r, String tag);
-}

bramble-android/src/main/java/org/briarproject/bramble/network/AndroidNetworkManager.java

@@ -9,17 +9,16 @@ import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
 
 import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.network.NetworkManager;
 import org.briarproject.bramble.api.network.NetworkStatus;
 import org.briarproject.bramble.api.network.event.NetworkStatusEvent;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.system.TaskScheduler;
+import org.briarproject.bramble.api.system.Scheduler;
-import org.briarproject.bramble.api.system.TaskScheduler.Cancellable;
 
-import java.util.concurrent.Executor;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
@@ -51,22 +50,20 @@ class AndroidNetworkManager implements NetworkManager, Service {
 	private static final String WIFI_AP_STATE_CHANGED_ACTION =
 			"android.net.wifi.WIFI_AP_STATE_CHANGED";
 
-	private final TaskScheduler scheduler;
+	private final ScheduledExecutorService scheduler;
 	private final EventBus eventBus;
-	private final Executor eventExecutor;
 	private final Context appContext;
-	private final AtomicReference<Cancellable> connectivityCheck =
+	private final AtomicReference<Future<?>> connectivityCheck =
 			new AtomicReference<>();
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
 	private volatile BroadcastReceiver networkStateReceiver = null;
 
 	@Inject
-	AndroidNetworkManager(TaskScheduler scheduler, EventBus eventBus,
+	AndroidNetworkManager(@Scheduler ScheduledExecutorService scheduler,
-			@EventExecutor Executor eventExecutor, Application app) {
+			EventBus eventBus, Application app) {
 		this.scheduler = scheduler;
 		this.eventBus = eventBus;
-		this.eventExecutor = eventExecutor;
 		this.appContext = app.getApplicationContext();
 	}
 
@@ -107,12 +104,11 @@ class AndroidNetworkManager implements NetworkManager, Service {
 	}
 
 	private void scheduleConnectionStatusUpdate(int delay, TimeUnit unit) {
-		Cancellable newConnectivityCheck =
+		Future<?> newConnectivityCheck =
-				scheduler.schedule(this::updateConnectionStatus, eventExecutor,
+				scheduler.schedule(this::updateConnectionStatus, delay, unit);
-						delay, unit);
+		Future<?> oldConnectivityCheck =
-		Cancellable oldConnectivityCheck =
 				connectivityCheck.getAndSet(newConnectivityCheck);
-		if (oldConnectivityCheck != null) oldConnectivityCheck.cancel();
+		if (oldConnectivityCheck != null) oldConnectivityCheck.cancel(false);
 	}
 
 	private class NetworkStateReceiver extends BroadcastReceiver {

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothConnectionFactory.java

@@ -1,36 +0,0 @@
-package org.briarproject.bramble.plugin.bluetooth;
-
-import android.bluetooth.BluetoothSocket;
-
-import org.briarproject.bramble.api.io.TimeoutMonitor;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
-
-import java.io.IOException;
-
-@NotNullByDefault
-class AndroidBluetoothConnectionFactory
-		implements BluetoothConnectionFactory<BluetoothSocket> {
-
-	private final BluetoothConnectionLimiter connectionLimiter;
-	private final AndroidWakeLockManager wakeLockManager;
-	private final TimeoutMonitor timeoutMonitor;
-
-	AndroidBluetoothConnectionFactory(
-			BluetoothConnectionLimiter connectionLimiter,
-			AndroidWakeLockManager wakeLockManager,
-			TimeoutMonitor timeoutMonitor) {
-		this.connectionLimiter = connectionLimiter;
-		this.wakeLockManager = wakeLockManager;
-		this.timeoutMonitor = timeoutMonitor;
-	}
-
-	@Override
-	public DuplexTransportConnection wrapSocket(DuplexPlugin plugin,
-			BluetoothSocket s) throws IOException {
-		return new AndroidBluetoothTransportConnection(plugin,
-				connectionLimiter, wakeLockManager, timeoutMonitor, s);
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.plugin.bluetooth;
 
-import android.app.Application;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.BluetoothServerSocket;
@@ -59,8 +58,7 @@ import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-class AndroidBluetoothPlugin
+class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
-		extends BluetoothPlugin<BluetoothSocket, BluetoothServerSocket> {
 
 	private static final Logger LOG =
 			getLogger(AndroidBluetoothPlugin.class.getName());
@@ -68,31 +66,23 @@ class AndroidBluetoothPlugin
 	private static final int MAX_DISCOVERY_MS = 10_000;
 
 	private final AndroidExecutor androidExecutor;
-	private final Application app;
+	private final Context appContext;
 	private final Clock clock;
 
+	private volatile boolean wasEnabledByUs = false;
 	private volatile BluetoothStateReceiver receiver = null;
 
 	// Non-null if the plugin started successfully
 	private volatile BluetoothAdapter adapter = null;
 
 	AndroidBluetoothPlugin(BluetoothConnectionLimiter connectionLimiter,
-			BluetoothConnectionFactory<BluetoothSocket> connectionFactory,
+			Executor ioExecutor, AndroidExecutor androidExecutor,
-			Executor ioExecutor,
+			Context appContext, SecureRandom secureRandom, Clock clock,
-			Executor wakefulIoExecutor,
+			Backoff backoff, PluginCallback callback, int maxLatency) {
-			SecureRandom secureRandom,
+		super(connectionLimiter, ioExecutor, secureRandom, backoff, callback,
-			AndroidExecutor androidExecutor,
+				maxLatency);
-			Application app,
-			Clock clock,
-			Backoff backoff,
-			PluginCallback callback,
-			int maxLatency,
-			int maxIdleTime) {
-		super(connectionLimiter, connectionFactory, ioExecutor,
-				wakefulIoExecutor, secureRandom, backoff, callback,
-				maxLatency, maxIdleTime);
 		this.androidExecutor = androidExecutor;
-		this.app = app;
+		this.appContext = appContext;
 		this.clock = clock;
 	}
 
@@ -104,13 +94,13 @@ class AndroidBluetoothPlugin
 		filter.addAction(ACTION_STATE_CHANGED);
 		filter.addAction(ACTION_SCAN_MODE_CHANGED);
 		receiver = new BluetoothStateReceiver();
-		app.registerReceiver(receiver, filter);
+		appContext.registerReceiver(receiver, filter);
 	}
 
 	@Override
 	public void stop() {
 		super.stop();
-		if (receiver != null) app.unregisterReceiver(receiver);
+		if (receiver != null) appContext.unregisterReceiver(receiver);
 	}
 
 	@Override
@@ -132,10 +122,36 @@ class AndroidBluetoothPlugin
 		return adapter != null && adapter.isEnabled();
 	}
 
+	@Override
+	void enableAdapter() {
+		if (adapter != null && !adapter.isEnabled()) {
+			if (adapter.enable()) {
+				LOG.info("Enabling Bluetooth");
+				wasEnabledByUs = true;
+			} else {
+				LOG.info("Could not enable Bluetooth");
+			}
+		}
+	}
+
+	@Override
+	void disableAdapterIfEnabledByUs() {
+		if (isAdapterEnabled() && wasEnabledByUs) {
+			if (adapter.disable()) LOG.info("Disabling Bluetooth");
+			else LOG.info("Could not disable Bluetooth");
+			wasEnabledByUs = false;
+		}
+	}
+
+	@Override
+	void setEnabledByUs() {
+		wasEnabledByUs = true;
+	}
+
 	@Override
 	@Nullable
 	String getBluetoothAddress() {
-		String address = AndroidUtils.getBluetoothAddress(app, adapter);
+		String address = AndroidUtils.getBluetoothAddress(appContext, adapter);
 		return address.isEmpty() ? null : address;
 	}
 
@@ -153,7 +169,12 @@ class AndroidBluetoothPlugin
 	@Override
 	DuplexTransportConnection acceptConnection(BluetoothServerSocket ss)
 			throws IOException {
-		return connectionFactory.wrapSocket(this, ss.accept());
+		return wrapSocket(ss.accept());
+	}
+
+	private DuplexTransportConnection wrapSocket(BluetoothSocket s) {
+		return new AndroidBluetoothTransportConnection(this,
+				connectionLimiter, s);
 	}
 
 	@Override
@@ -170,7 +191,7 @@ class AndroidBluetoothPlugin
 		try {
 			s = d.createInsecureRfcommSocketToServiceRecord(u);
 			s.connect();
-			return connectionFactory.wrapSocket(this, s);
+			return wrapSocket(s);
 		} catch (IOException e) {
 			IoUtils.tryToClose(s, LOG, WARNING);
 			throw e;
@@ -205,7 +226,7 @@ class AndroidBluetoothPlugin
 		filter.addAction(ACTION_DISCOVERY_STARTED);
 		filter.addAction(ACTION_DISCOVERY_FINISHED);
 		filter.addAction(ACTION_FOUND);
-		app.registerReceiver(receiver, filter);
+		appContext.registerReceiver(receiver, filter);
 		try {
 			if (adapter.startDiscovery()) {
 				long now = clock.currentTimeMillis();
@@ -242,7 +263,7 @@ class AndroidBluetoothPlugin
 		} finally {
 			LOG.info("Cancelling discovery");
 			adapter.cancelDiscovery();
-			app.unregisterReceiver(receiver);
+			appContext.unregisterReceiver(receiver);
 		}
 		// Shuffle the addresses so we don't always try the same one first
 		shuffle(addresses);

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPluginFactory.java

@@ -1,11 +1,8 @@
 package org.briarproject.bramble.plugin.bluetooth;
 
-import android.app.Application;
+import android.content.Context;
-import android.bluetooth.BluetoothSocket;
 
 import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.io.TimeoutMonitor;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
@@ -14,15 +11,12 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.system.AndroidExecutor;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.system.WakefulIoExecutor;
 
 import java.security.SecureRandom;
 import java.util.concurrent.Executor;
 
 import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
 
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
 
@@ -31,41 +25,28 @@ import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
 public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 
 	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
-	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
 	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
 	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
 	private static final double BACKOFF_BASE = 1.2;
 
-	private final Executor ioExecutor, wakefulIoExecutor;
+	private final Executor ioExecutor;
 	private final AndroidExecutor androidExecutor;
-	private final AndroidWakeLockManager wakeLockManager;
+	private final Context appContext;
-	private final Application app;
 	private final SecureRandom secureRandom;
 	private final EventBus eventBus;
 	private final Clock clock;
-	private final TimeoutMonitor timeoutMonitor;
 	private final BackoffFactory backoffFactory;
 
-	@Inject
+	public AndroidBluetoothPluginFactory(Executor ioExecutor,
-	public AndroidBluetoothPluginFactory(@IoExecutor Executor ioExecutor,
+			AndroidExecutor androidExecutor, Context appContext,
-			@WakefulIoExecutor Executor wakefulIoExecutor,
+			SecureRandom secureRandom, EventBus eventBus, Clock clock,
-			AndroidExecutor androidExecutor,
-			AndroidWakeLockManager wakeLockManager,
-			Application app,
-			SecureRandom secureRandom,
-			EventBus eventBus,
-			Clock clock,
-			TimeoutMonitor timeoutMonitor,
 			BackoffFactory backoffFactory) {
 		this.ioExecutor = ioExecutor;
-		this.wakefulIoExecutor = wakefulIoExecutor;
 		this.androidExecutor = androidExecutor;
-		this.wakeLockManager = wakeLockManager;
+		this.appContext = appContext;
-		this.app = app;
 		this.secureRandom = secureRandom;
 		this.eventBus = eventBus;
 		this.clock = clock;
-		this.timeoutMonitor = timeoutMonitor;
 		this.backoffFactory = backoffFactory;
 	}
 
@@ -82,16 +63,12 @@ public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 	@Override
 	public DuplexPlugin createPlugin(PluginCallback callback) {
 		BluetoothConnectionLimiter connectionLimiter =
-				new BluetoothConnectionLimiterImpl(eventBus);
+				new BluetoothConnectionLimiterImpl();
-		BluetoothConnectionFactory<BluetoothSocket> connectionFactory =
-				new AndroidBluetoothConnectionFactory(connectionLimiter,
-						wakeLockManager, timeoutMonitor);
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		AndroidBluetoothPlugin plugin = new AndroidBluetoothPlugin(
-				connectionLimiter, connectionFactory, ioExecutor,
+				connectionLimiter, ioExecutor, androidExecutor, appContext,
-				wakefulIoExecutor, secureRandom, androidExecutor, app,
+				secureRandom, clock, backoff, callback, MAX_LATENCY);
-				clock, backoff, callback, MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothTransportConnection.java

@@ -2,12 +2,9 @@ package org.briarproject.bramble.plugin.bluetooth;
 
 import android.bluetooth.BluetoothSocket;
 
-import org.briarproject.bramble.api.io.TimeoutMonitor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.duplex.AbstractDuplexTransportConnection;
-import org.briarproject.bramble.api.system.AndroidWakeLock;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -20,30 +17,22 @@ import static org.briarproject.bramble.util.AndroidUtils.isValidBluetoothAddress
 class AndroidBluetoothTransportConnection
 		extends AbstractDuplexTransportConnection {
 
-	private final BluetoothConnectionLimiter connectionLimiter;
+	private final BluetoothConnectionLimiter connectionManager;
 	private final BluetoothSocket socket;
-	private final InputStream in;
-	private final AndroidWakeLock wakeLock;
 
 	AndroidBluetoothTransportConnection(Plugin plugin,
-			BluetoothConnectionLimiter connectionLimiter,
+			BluetoothConnectionLimiter connectionManager,
-			AndroidWakeLockManager wakeLockManager,
+			BluetoothSocket socket) {
-			TimeoutMonitor timeoutMonitor,
-			BluetoothSocket socket) throws IOException {
 		super(plugin);
-		this.connectionLimiter = connectionLimiter;
+		this.connectionManager = connectionManager;
 		this.socket = socket;
-		in = timeoutMonitor.createTimeoutInputStream(
-				socket.getInputStream(), plugin.getMaxIdleTime() * 2);
-		wakeLock = wakeLockManager.createWakeLock("BluetoothConnection");
-		wakeLock.acquire();
 		String address = socket.getRemoteDevice().getAddress();
 		if (isValidBluetoothAddress(address)) remote.put(PROP_ADDRESS, address);
 	}
 
 	@Override
-	protected InputStream getInputStream() {
+	protected InputStream getInputStream() throws IOException {
-		return in;
+		return socket.getInputStream();
 	}
 
 	@Override
@@ -55,10 +44,8 @@ class AndroidBluetoothTransportConnection
 	protected void closeConnection(boolean exception) throws IOException {
 		try {
 			socket.close();
-			in.close();
 		} finally {
-			wakeLock.release();
+			connectionManager.connectionClosed(this);
-			connectionLimiter.connectionClosed(this);
 		}
 	}
 }

bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java

@@ -1,30 +1,23 @@
 package org.briarproject.bramble.plugin.tcp;
 
-import android.annotation.TargetApi;
+import android.content.Context;
-import android.app.Application;
 import android.net.ConnectivityManager;
-import android.net.LinkAddress;
-import android.net.LinkProperties;
 import android.net.Network;
-import android.net.NetworkCapabilities;
+import android.net.NetworkInfo;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 
 import org.briarproject.bramble.PoliteExecutor;
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.network.event.NetworkStatusEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.PluginCallback;
-import org.briarproject.bramble.api.settings.Settings;
 
 import java.io.IOException;
 import java.net.InetAddress;
-import java.net.InterfaceAddress;
-import java.net.NetworkInterface;
 import java.net.Socket;
-import java.net.SocketException;
 import java.net.UnknownHostException;
 import java.util.List;
 import java.util.concurrent.Executor;
@@ -35,22 +28,14 @@ import javax.net.SocketFactory;
 
 import static android.content.Context.CONNECTIVITY_SERVICE;
 import static android.content.Context.WIFI_SERVICE;
-import static android.net.NetworkCapabilities.TRANSPORT_WIFI;
+import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Collections.emptyList;
-import static java.util.Collections.list;
 import static java.util.Collections.singletonList;
-import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-import static org.briarproject.bramble.api.plugin.LanTcpConstants.DEFAULT_PREF_PLUGIN_ENABLE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.INACTIVE;
-import static org.briarproject.bramble.util.IoUtils.tryToClose;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
-class AndroidLanTcpPlugin extends LanTcpPlugin {
+class AndroidLanTcpPlugin extends LanTcpPlugin implements EventListener {
 
 	private static final Logger LOG =
 			getLogger(AndroidLanTcpPlugin.class.getName());
@@ -62,22 +47,20 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 
 	private volatile SocketFactory socketFactory;
 
-	AndroidLanTcpPlugin(Executor ioExecutor,
+	AndroidLanTcpPlugin(Executor ioExecutor, Context appContext,
-			Executor wakefulIoExecutor,
+			Backoff backoff, PluginCallback callback, int maxLatency,
-			Application app,
+			int maxIdleTime, int connectionTimeout) {
-			Backoff backoff,
+		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime,
-			PluginCallback callback,
+				connectionTimeout);
-			int maxLatency,
-			int maxIdleTime,
-			int connectionTimeout) {
-		super(ioExecutor, wakefulIoExecutor, backoff, callback, maxLatency,
-				maxIdleTime, connectionTimeout);
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor =
 				new PoliteExecutor("AndroidLanTcpPlugin", ioExecutor, 1);
-		connectivityManager = (ConnectivityManager)
+		ConnectivityManager connectivityManager = (ConnectivityManager)
-				requireNonNull(app.getSystemService(CONNECTIVITY_SERVICE));
+				appContext.getSystemService(CONNECTIVITY_SERVICE);
-		wifiManager = (WifiManager) app.getSystemService(WIFI_SERVICE);
+		if (connectivityManager == null) throw new AssertionError();
+		this.connectivityManager = connectivityManager;
+		wifiManager = (WifiManager) appContext.getApplicationContext()
+				.getSystemService(WIFI_SERVICE);
 		socketFactory = SocketFactory.getDefault();
 	}
 
@@ -85,137 +68,37 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	public void start() {
 		if (used.getAndSet(true)) throw new IllegalStateException();
 		initialisePortProperty();
-		Settings settings = callback.getSettings();
+		running = true;
-		state.setStarted(settings.getBoolean(PREF_PLUGIN_ENABLE,
-				DEFAULT_PREF_PLUGIN_ENABLE));
 		updateConnectionStatus();
 	}
 
+	@Override
+	public void stop() {
+		running = false;
+		tryToClose(socket);
+	}
+
 	@Override
 	protected Socket createSocket() throws IOException {
 		return socketFactory.createSocket();
 	}
 
 	@Override
-	protected List<InetAddress> getUsableLocalInetAddresses(boolean ipv4) {
+	protected List<InetAddress> getUsableLocalInetAddresses() {
-		InetAddress addr = getWifiAddress(ipv4);
+		// If the device doesn't have wifi, don't open any sockets
-		return addr == null ? emptyList() : singletonList(addr);
+		if (wifiManager == null) return emptyList();
-	}
-
-	@Nullable
-	private InetAddress getWifiAddress(boolean ipv4) {
-		Pair<InetAddress, Boolean> wifi = getWifiIpv4Address();
-		if (ipv4) return wifi == null ? null : wifi.getFirst();
-		// If there's no wifi IPv4 address, we might be a client on an
-		// IPv6-only wifi network. We can only detect this on API 21+
-		if (wifi == null) {
-			return SDK_INT >= 21 ? getWifiClientIpv6Address() : null;
-		}
-		// Use the wifi IPv4 address to determine which interface's IPv6
-		// address we should return (if the interface has a suitable address)
-		return getIpv6AddressForInterface(wifi.getFirst());
-	}
-
-	/**
-	 * Returns a {@link Pair} where the first element is the IPv4 address of
-	 * the wifi interface and the second element is true if this device is
-	 * providing an access point, or false if this device is a client. Returns
-	 * null if this device isn't connected to wifi as an access point or client.
-	 */
-	@Nullable
-	private Pair<InetAddress, Boolean> getWifiIpv4Address() {
-		if (wifiManager == null) return null;
 		// If we're connected to a wifi network, return its address
 		WifiInfo info = wifiManager.getConnectionInfo();
 		if (info != null && info.getIpAddress() != 0) {
-			return new Pair<>(intToInetAddress(info.getIpAddress()), false);
+			return singletonList(intToInetAddress(info.getIpAddress()));
 		}
-		List<InterfaceAddress> ifAddrs = getLocalInterfaceAddresses();
+		// If we're running an access point, return its address
-		// If we're providing a normal access point, return its address
+		for (InetAddress addr : getLocalInetAddresses()) {
-		for (InterfaceAddress ifAddr : ifAddrs) {
+			if (addr.equals(WIFI_AP_ADDRESS)) return singletonList(addr);
-			if (isAndroidWifiApAddress(ifAddr)) {
+			if (addr.equals(WIFI_DIRECT_AP_ADDRESS)) return singletonList(addr);
-				return new Pair<>(ifAddr.getAddress(), true);
-			}
-		}
-		// If we're providing a wifi direct access point, return its address
-		for (InterfaceAddress ifAddr : ifAddrs) {
-			if (isAndroidWifiDirectApAddress(ifAddr)) {
-				return new Pair<>(ifAddr.getAddress(), true);
-			}
-		}
-		// Not connected to wifi
-		return null;
-	}
-
-	/**
-	 * Returns true if the given address belongs to a network provided by an
-	 * Android access point (including the access point's own address).
-	 * <p>
-	 * The access point's address is usually 192.168.43.1, but at least one
-	 * device (Honor 8A) may use other addresses in the range 192.168.43.0/24.
-	 */
-	private boolean isAndroidWifiApAddress(InterfaceAddress ifAddr) {
-		if (ifAddr.getNetworkPrefixLength() != 24) return false;
-		byte[] ip = ifAddr.getAddress().getAddress();
-		return ip.length == 4
-				&& ip[0] == (byte) 192
-				&& ip[1] == (byte) 168
-				&& ip[2] == (byte) 43;
-	}
-
-	/**
-	 * Returns true if the given address belongs to a network provided by an
-	 * Android wifi direct legacy mode access point (including the access
-	 * point's own address).
-	 */
-	private boolean isAndroidWifiDirectApAddress(InterfaceAddress ifAddr) {
-		if (ifAddr.getNetworkPrefixLength() != 24) return false;
-		byte[] ip = ifAddr.getAddress().getAddress();
-		return ip.length == 4
-				&& ip[0] == (byte) 192
-				&& ip[1] == (byte) 168
-				&& ip[2] == (byte) 49;
-	}
-
-	/**
-	 * Returns a link-local IPv6 address for the wifi client interface, or null
-	 * if there's no such interface or it doesn't have a suitable address.
-	 */
-	@TargetApi(21)
-	@Nullable
-	private InetAddress getWifiClientIpv6Address() {
-		for (Network net : connectivityManager.getAllNetworks()) {
-			NetworkCapabilities caps =
-					connectivityManager.getNetworkCapabilities(net);
-			if (caps == null || !caps.hasTransport(TRANSPORT_WIFI)) continue;
-			LinkProperties props = connectivityManager.getLinkProperties(net);
-			if (props == null) continue;
-			for (LinkAddress linkAddress : props.getLinkAddresses()) {
-				InetAddress addr = linkAddress.getAddress();
-				if (isIpv6LinkLocalAddress(addr)) return addr;
-			}
-		}
-		return null;
-	}
-
-	/**
-	 * Returns a link-local IPv6 address for the interface with the given IPv4
-	 * address, or null if the interface doesn't have a suitable address.
-	 */
-	@Nullable
-	private InetAddress getIpv6AddressForInterface(InetAddress ipv4) {
-		try {
-			NetworkInterface iface = NetworkInterface.getByInetAddress(ipv4);
-			if (iface == null) return null;
-			for (InetAddress addr : list(iface.getInetAddresses())) {
-				if (isIpv6LinkLocalAddress(addr)) return addr;
-			}
-			// No suitable address
-			return null;
-		} catch (SocketException e) {
-			logException(LOG, WARNING, e);
-			return null;
 		}
+		// No suitable addresses
+		return emptyList();
 	}
 
 	private InetAddress intToInetAddress(int ip) {
@@ -237,11 +120,9 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	private SocketFactory getSocketFactory() {
 		if (SDK_INT < 21) return SocketFactory.getDefault();
 		for (Network net : connectivityManager.getAllNetworks()) {
-			NetworkCapabilities caps =
+			NetworkInfo info = connectivityManager.getNetworkInfo(net);
-					connectivityManager.getNetworkCapabilities(net);
+			if (info != null && info.getType() == TYPE_WIFI)
-			if (caps != null && caps.hasTransport(TRANSPORT_WIFI)) {
 				return net.getSocketFactory();
-			}
 		}
 		LOG.warning("Could not find suitable socket factory");
 		return SocketFactory.getDefault();
@@ -249,59 +130,31 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 
 	@Override
 	public void eventOccurred(Event e) {
-		super.eventOccurred(e);
 		if (e instanceof NetworkStatusEvent) updateConnectionStatus();
 	}
 
 	private void updateConnectionStatus() {
 		connectionStatusExecutor.execute(() -> {
-			State s = getState();
+			if (!running) return;
-			if (s != ACTIVE && s != INACTIVE) return;
+			List<InetAddress> addrs = getUsableLocalInetAddresses();
-			Pair<InetAddress, Boolean> wifi = getPreferredWifiAddress();
+			if (addrs.contains(WIFI_AP_ADDRESS)
-			if (wifi == null) {
+					|| addrs.contains(WIFI_DIRECT_AP_ADDRESS)) {
-				LOG.info("Not connected to wifi");
-				socketFactory = SocketFactory.getDefault();
-				// Server sockets may not have been closed automatically when
-				// interface was taken down. If any sockets are open, closing
-				// them here will cause the sockets to be cleared and the state
-				// to be updated in acceptContactConnections()
-				if (s == ACTIVE) {
-					LOG.info("Closing server sockets");
-					tryToClose(state.getServerSocket(true), LOG, WARNING);
-					tryToClose(state.getServerSocket(false), LOG, WARNING);
-				}
-			} else if (wifi.getSecond()) {
 				LOG.info("Providing wifi hotspot");
 				// There's no corresponding Network object and thus no way
 				// to get a suitable socket factory, so we won't be able to
 				// make outgoing connections on API 21+ if another network
 				// has internet access
 				socketFactory = SocketFactory.getDefault();
-				bind();
+				if (socket == null || socket.isClosed()) bind();
+			} else if (addrs.isEmpty()) {
+				LOG.info("Not connected to wifi");
+				socketFactory = SocketFactory.getDefault();
+				tryToClose(socket);
 			} else {
 				LOG.info("Connected to wifi");
 				socketFactory = getSocketFactory();
-				bind();
+				if (socket == null || socket.isClosed()) bind();
 			}
 		});
 	}
-
-	/**
-	 * Returns a {@link Pair} where the first element is an IP address (IPv4 if
-	 * available, otherwise IPv6) of the wifi interface and the second element
-	 * is true if this device is providing an access point, or false if this
-	 * device is a client. Returns null if this device isn't connected to wifi
-	 * as an access point or client.
-	 */
-	@Nullable
-	private Pair<InetAddress, Boolean> getPreferredWifiAddress() {
-		Pair<InetAddress, Boolean> wifi = getWifiIpv4Address();
-		// If there's no wifi IPv4 address, we might be a client on an
-		// IPv6-only wifi network. We can only detect this on API 21+
-		if (wifi == null && SDK_INT >= 21) {
-			InetAddress ipv6 = getWifiClientIpv6Address();
-			if (ipv6 != null) return new Pair<>(ipv6, false);
-		}
-		return wifi;
-	}
 }

bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPluginFactory.java

@@ -1,9 +1,8 @@
 package org.briarproject.bramble.plugin.tcp;
 
-import android.app.Application;
+import android.content.Context;
 
 import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
@@ -11,12 +10,10 @@ import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.system.WakefulIoExecutor;
 
 import java.util.concurrent.Executor;
 
 import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
 
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
 
@@ -31,22 +28,17 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 	private static final int MAX_POLLING_INTERVAL = 600_000; // 10 mins
 	private static final double BACKOFF_BASE = 1.2;
 
-	private final Executor ioExecutor, wakefulIoExecutor;
+	private final Executor ioExecutor;
 	private final EventBus eventBus;
 	private final BackoffFactory backoffFactory;
-	private final Application app;
+	private final Context appContext;
 
-	@Inject
+	public AndroidLanTcpPluginFactory(Executor ioExecutor, EventBus eventBus,
-	public AndroidLanTcpPluginFactory(@IoExecutor Executor ioExecutor,
+			BackoffFactory backoffFactory, Context appContext) {
-			@WakefulIoExecutor Executor wakefulIoExecutor,
-			EventBus eventBus,
-			BackoffFactory backoffFactory,
-			Application app) {
 		this.ioExecutor = ioExecutor;
-		this.wakefulIoExecutor = wakefulIoExecutor;
 		this.eventBus = eventBus;
 		this.backoffFactory = backoffFactory;
-		this.app = app;
+		this.appContext = appContext;
 	}
 
 	@Override
@@ -64,8 +56,8 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		AndroidLanTcpPlugin plugin = new AndroidLanTcpPlugin(ioExecutor,
-				wakefulIoExecutor, app, backoff, callback,
+				appContext, backoff, callback, MAX_LATENCY, MAX_IDLE_TIME,
-				MAX_LATENCY, MAX_IDLE_TIME, CONNECTION_TIMEOUT);
+				CONNECTION_TIMEOUT);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/AndroidTorPlugin.java

@@ -1,9 +1,10 @@
 package org.briarproject.bramble.plugin.tor;
 
-import android.app.Application;
+import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
+import android.os.PowerManager;
 
 import org.briarproject.bramble.api.battery.BatteryManager;
 import org.briarproject.bramble.api.network.NetworkManager;
@@ -11,50 +12,48 @@ import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.PluginCallback;
-import org.briarproject.bramble.api.system.AndroidWakeLock;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.api.system.ResourceProvider;
+import org.briarproject.bramble.util.RenewableWakeLock;
 
-import java.io.File;
 import java.io.IOException;
 import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
 
 import javax.net.SocketFactory;
 
+import static android.content.Context.MODE_PRIVATE;
+import static android.content.Context.POWER_SERVICE;
+import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
+import static java.util.concurrent.TimeUnit.MINUTES;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 class AndroidTorPlugin extends TorPlugin {
 
-	private final Application app;
+	private final Context appContext;
-	private final AndroidWakeLock wakeLock;
+	private final RenewableWakeLock wakeLock;
 
-	AndroidTorPlugin(Executor ioExecutor,
+	AndroidTorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
-			Executor wakefulIoExecutor,
+			Context appContext, NetworkManager networkManager,
-			Application app,
+			LocationUtils locationUtils, SocketFactory torSocketFactory,
-			NetworkManager networkManager,
+			Clock clock, ResourceProvider resourceProvider,
-			LocationUtils locationUtils,
-			SocketFactory torSocketFactory,
-			Clock clock,
-			ResourceProvider resourceProvider,
 			CircumventionProvider circumventionProvider,
-			BatteryManager batteryManager,
+			BatteryManager batteryManager, Backoff backoff,
-			AndroidWakeLockManager wakeLockManager,
-			Backoff backoff,
 			TorRendezvousCrypto torRendezvousCrypto,
-			PluginCallback callback,
+			PluginCallback callback, String architecture, int maxLatency,
-			String architecture,
+			int maxIdleTime) {
-			int maxLatency,
+		super(ioExecutor, networkManager, locationUtils, torSocketFactory,
-			int maxIdleTime,
+				clock, resourceProvider, circumventionProvider, batteryManager,
-			File torDirectory) {
+				backoff, torRendezvousCrypto, callback, architecture, maxLatency, maxIdleTime,
-		super(ioExecutor, wakefulIoExecutor, networkManager, locationUtils,
+				appContext.getDir("tor", MODE_PRIVATE));
-				torSocketFactory, clock, resourceProvider,
+		this.appContext = appContext;
-				circumventionProvider, batteryManager, backoff,
+		PowerManager pm = (PowerManager)
-				torRendezvousCrypto, callback, architecture, maxLatency,
+				appContext.getSystemService(POWER_SERVICE);
-				maxIdleTime, torDirectory);
+		if (pm == null) throw new AssertionError();
-		this.app = app;
+		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
-		wakeLock = wakeLockManager.createWakeLock("TorPlugin");
+				getWakeLockTag(), 1, MINUTES);
 	}
 
 	@Override
@@ -65,8 +64,8 @@ class AndroidTorPlugin extends TorPlugin {
 	@Override
 	protected long getLastUpdateTime() {
 		try {
-			PackageManager pm = app.getPackageManager();
+			PackageManager pm = appContext.getPackageManager();
-			PackageInfo pi = pm.getPackageInfo(app.getPackageName(), 0);
+			PackageInfo pi = pm.getPackageInfo(appContext.getPackageName(), 0);
 			return pi.lastUpdateTime;
 		} catch (NameNotFoundException e) {
 			throw new AssertionError(e);
@@ -75,6 +74,7 @@ class AndroidTorPlugin extends TorPlugin {
 
 	@Override
 	protected void enableNetwork(boolean enable) throws IOException {
+		if (!running) return;
 		if (enable) wakeLock.acquire();
 		super.enableNetwork(enable);
 		if (!enable) wakeLock.release();
@@ -85,4 +85,17 @@ class AndroidTorPlugin extends TorPlugin {
 		super.stop();
 		wakeLock.release();
 	}
+
+	private String getWakeLockTag() {
+		PackageManager pm = appContext.getPackageManager();
+		for (PackageInfo info : pm.getInstalledPackages(0)) {
+			String name = info.packageName.toLowerCase();
+			if (name.startsWith("com.huawei.powergenie")) {
+				return "LocationManagerService";
+			} else if (name.startsWith("com.evenwell.powermonitor")) {
+				return "AudioIn";
+			}
+		}
+		return getClass().getSimpleName();
+	}
 }

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/AndroidTorPluginFactory.java

@@ -1,33 +1,28 @@
 package org.briarproject.bramble.plugin.tor;
 
-import android.app.Application;
+import android.content.Context;
 
 import org.briarproject.bramble.api.battery.BatteryManager;
 import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.network.NetworkManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.TorConstants;
-import org.briarproject.bramble.api.plugin.TorDirectory;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.api.system.ResourceProvider;
-import org.briarproject.bramble.api.system.WakefulIoExecutor;
 import org.briarproject.bramble.util.AndroidUtils;
 
-import java.io.File;
 import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
 import javax.net.SocketFactory;
 
 @Immutable
@@ -43,8 +38,9 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
 	private static final double BACKOFF_BASE = 1.2;
 
-	private final Executor ioExecutor, wakefulIoExecutor;
+	private final Executor ioExecutor;
-	private final Application app;
+	private final ScheduledExecutorService scheduler;
+	private final Context appContext;
 	private final NetworkManager networkManager;
 	private final LocationUtils locationUtils;
 	private final EventBus eventBus;
@@ -53,28 +49,18 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 	private final ResourceProvider resourceProvider;
 	private final CircumventionProvider circumventionProvider;
 	private final BatteryManager batteryManager;
-	private final AndroidWakeLockManager wakeLockManager;
 	private final Clock clock;
-	private final File torDirectory;
 
-	@Inject
+	public AndroidTorPluginFactory(Executor ioExecutor,
-	public AndroidTorPluginFactory(@IoExecutor Executor ioExecutor,
+			ScheduledExecutorService scheduler, Context appContext,
-			@WakefulIoExecutor Executor wakefulIoExecutor,
+			NetworkManager networkManager, LocationUtils locationUtils,
-			Application app,
+			EventBus eventBus, SocketFactory torSocketFactory,
-			NetworkManager networkManager,
+			BackoffFactory backoffFactory, ResourceProvider resourceProvider,
-			LocationUtils locationUtils,
-			EventBus eventBus,
-			SocketFactory torSocketFactory,
-			BackoffFactory backoffFactory,
-			ResourceProvider resourceProvider,
 			CircumventionProvider circumventionProvider,
-			BatteryManager batteryManager,
+			BatteryManager batteryManager, Clock clock) {
-			AndroidWakeLockManager wakeLockManager,
-			Clock clock,
-			@TorDirectory File torDirectory) {
 		this.ioExecutor = ioExecutor;
-		this.wakefulIoExecutor = wakefulIoExecutor;
+		this.scheduler = scheduler;
-		this.app = app;
+		this.appContext = appContext;
 		this.networkManager = networkManager;
 		this.locationUtils = locationUtils;
 		this.eventBus = eventBus;
@@ -83,9 +69,7 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 		this.resourceProvider = resourceProvider;
 		this.circumventionProvider = circumventionProvider;
 		this.batteryManager = batteryManager;
-		this.wakeLockManager = wakeLockManager;
 		this.clock = clock;
-		this.torDirectory = torDirectory;
 	}
 
 	@Override
@@ -128,12 +112,11 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		TorRendezvousCrypto torRendezvousCrypto = new TorRendezvousCryptoImpl();
-		AndroidTorPlugin plugin = new AndroidTorPlugin(ioExecutor,
+		AndroidTorPlugin plugin = new AndroidTorPlugin(ioExecutor, scheduler,
-				wakefulIoExecutor, app, networkManager, locationUtils,
+				appContext, networkManager, locationUtils, torSocketFactory,
-				torSocketFactory, clock, resourceProvider,
+				clock, resourceProvider, circumventionProvider, batteryManager,
-				circumventionProvider, batteryManager, wakeLockManager,
 				backoff, torRendezvousCrypto, callback, architecture,
-				MAX_LATENCY, MAX_IDLE_TIME, torDirectory);
+				MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

bramble-android/src/main/java/org/briarproject/bramble/system/AlarmConstants.java

@@ -1,18 +0,0 @@
-package org.briarproject.bramble.system;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-interface AlarmConstants {
-
-	/**
-	 * Request code for the broadcast intent attached to the periodic alarm.
-	 */
-	int REQUEST_ALARM = 1;
-
-	/**
-	 * Key for storing the process ID in the extras of the periodic alarm's
-	 * intent. This allows us to ignore alarms scheduled by dead processes.
-	 */
-	String EXTRA_PID = "org.briarproject.bramble.EXTRA_PID";
-}

bramble-android/src/main/java/org/briarproject/bramble/system/AlarmReceiver.java

@@ -1,17 +0,0 @@
-package org.briarproject.bramble.system;
-
-import android.content.BroadcastReceiver;
-import android.content.Context;
-import android.content.Intent;
-
-import org.briarproject.bramble.BrambleApplication;
-
-public class AlarmReceiver extends BroadcastReceiver {
-
-	@Override
-	public void onReceive(Context ctx, Intent intent) {
-		BrambleApplication app =
-				(BrambleApplication) ctx.getApplicationContext();
-		app.getBrambleAppComponent().alarmListener().onAlarm(intent);
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidLocationUtils.java

@@ -61,12 +61,12 @@ class AndroidLocationUtils implements LocationUtils {
 	private String getCountryFromPhoneNetwork() {
 		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
 		TelephonyManager tm = (TelephonyManager) o;
-		return tm == null ? "" : tm.getNetworkCountryIso();
+		return tm.getNetworkCountryIso();
 	}
 
 	private String getCountryFromSimCard() {
 		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
 		TelephonyManager tm = (TelephonyManager) o;
-		return tm == null ? "" : tm.getSimCountryIso();
+		return tm.getSimCountryIso();
 	}
 }

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSystemModule.java

@@ -1,17 +1,12 @@
 package org.briarproject.bramble.system;
 
 import org.briarproject.bramble.api.event.EventExecutor;
-import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.system.AndroidExecutor;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.api.system.ResourceProvider;
 import org.briarproject.bramble.api.system.SecureRandomProvider;
 
 import java.util.concurrent.Executor;
-import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledThreadPoolExecutor;
 
 import javax.inject.Singleton;
 
@@ -21,23 +16,6 @@ import dagger.Provides;
 @Module
 public class AndroidSystemModule {
 
-	private final ScheduledExecutorService scheduledExecutorService;
-
-	public AndroidSystemModule() {
-		// Discard tasks that are submitted during shutdown
-		RejectedExecutionHandler policy =
-				new ScheduledThreadPoolExecutor.DiscardPolicy();
-		scheduledExecutorService = new ScheduledThreadPoolExecutor(1, policy);
-	}
-
-	@Provides
-	@Singleton
-	ScheduledExecutorService provideScheduledExecutorService(
-			LifecycleManager lifecycleManager) {
-		lifecycleManager.registerForShutdown(scheduledExecutorService);
-		return scheduledExecutorService;
-	}
-
 	@Provides
 	@Singleton
 	SecureRandomProvider provideSecureRandomProvider(
@@ -69,11 +47,4 @@ public class AndroidSystemModule {
 	ResourceProvider provideResourceProvider(AndroidResourceProvider provider) {
 		return provider;
 	}
-
-	@Provides
-	@Singleton
-	AndroidWakeLockManager provideWakeLockManager(
-			AndroidWakeLockManagerImpl wakeLockManager) {
-		return wakeLockManager;
-	}
 }

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidTaskScheduler.java

@@ -1,242 +0,0 @@
-package org.briarproject.bramble.system;
-
-import android.annotation.TargetApi;
-import android.app.AlarmManager;
-import android.app.Application;
-import android.app.PendingIntent;
-import android.content.Intent;
-import android.os.Process;
-import android.os.SystemClock;
-
-import org.briarproject.bramble.api.lifecycle.Service;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.AlarmListener;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
-import org.briarproject.bramble.api.system.TaskScheduler;
-import org.briarproject.bramble.api.system.Wakeful;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.PriorityQueue;
-import java.util.Queue;
-import java.util.concurrent.Executor;
-import java.util.concurrent.Future;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.logging.Logger;
-
-import javax.annotation.concurrent.GuardedBy;
-import javax.annotation.concurrent.ThreadSafe;
-
-import static android.app.AlarmManager.ELAPSED_REALTIME_WAKEUP;
-import static android.app.AlarmManager.INTERVAL_FIFTEEN_MINUTES;
-import static android.app.PendingIntent.FLAG_CANCEL_CURRENT;
-import static android.content.Context.ALARM_SERVICE;
-import static android.os.Build.VERSION.SDK_INT;
-import static java.util.Objects.requireNonNull;
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static java.util.logging.Level.INFO;
-import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.system.AlarmConstants.EXTRA_PID;
-import static org.briarproject.bramble.system.AlarmConstants.REQUEST_ALARM;
-
-@ThreadSafe
-@NotNullByDefault
-class AndroidTaskScheduler implements TaskScheduler, Service, AlarmListener {
-
-	private static final Logger LOG =
-			getLogger(AndroidTaskScheduler.class.getName());
-
-	private static final long ALARM_MS = INTERVAL_FIFTEEN_MINUTES;
-
-	private final Application app;
-	private final AndroidWakeLockManager wakeLockManager;
-	private final ScheduledExecutorService scheduledExecutorService;
-	private final AlarmManager alarmManager;
-
-	private final Object lock = new Object();
-	@GuardedBy("lock")
-	private final Queue<ScheduledTask> tasks = new PriorityQueue<>();
-
-	AndroidTaskScheduler(Application app,
-			AndroidWakeLockManager wakeLockManager,
-			ScheduledExecutorService scheduledExecutorService) {
-		this.app = app;
-		this.wakeLockManager = wakeLockManager;
-		this.scheduledExecutorService = scheduledExecutorService;
-		alarmManager = (AlarmManager)
-				requireNonNull(app.getSystemService(ALARM_SERVICE));
-	}
-
-	@Override
-	public void startService() {
-		scheduleAlarm();
-	}
-
-	@Override
-	public void stopService() {
-		cancelAlarm();
-	}
-
-	@Override
-	public Cancellable schedule(Runnable task, Executor executor, long delay,
-			TimeUnit unit) {
-		AtomicBoolean cancelled = new AtomicBoolean(false);
-		return schedule(task, executor, delay, unit, cancelled);
-	}
-
-	@Override
-	public Cancellable scheduleWithFixedDelay(Runnable task, Executor executor,
-			long delay, long interval, TimeUnit unit) {
-		AtomicBoolean cancelled = new AtomicBoolean(false);
-		return scheduleWithFixedDelay(task, executor, delay, interval, unit,
-				cancelled);
-	}
-
-	@Override
-	public void onAlarm(Intent intent) {
-		wakeLockManager.runWakefully(() -> {
-			int extraPid = intent.getIntExtra(EXTRA_PID, -1);
-			int currentPid = Process.myPid();
-			if (extraPid == currentPid) {
-				LOG.info("Alarm");
-				rescheduleAlarm();
-				runDueTasks();
-			} else if (LOG.isLoggable(INFO)) {
-				LOG.info("Ignoring alarm with PID " + extraPid
-						+ ", current PID is " + currentPid);
-			}
-		}, "TaskAlarm");
-	}
-
-	private Cancellable schedule(Runnable task, Executor executor, long delay,
-			TimeUnit unit, AtomicBoolean cancelled) {
-		long now = SystemClock.elapsedRealtime();
-		long dueMillis = now + MILLISECONDS.convert(delay, unit);
-		Runnable wakeful = () ->
-				wakeLockManager.executeWakefully(task, executor, "TaskHandoff");
-		Future<?> check = scheduleCheckForDueTasks(delay, unit);
-		ScheduledTask s = new ScheduledTask(wakeful, dueMillis, check,
-				cancelled);
-		synchronized (lock) {
-			tasks.add(s);
-		}
-		return s;
-	}
-
-	private Cancellable scheduleWithFixedDelay(Runnable task, Executor executor,
-			long delay, long interval, TimeUnit unit, AtomicBoolean cancelled) {
-		// All executions of this periodic task share a cancelled flag
-		Runnable wrapped = () -> {
-			task.run();
-			scheduleWithFixedDelay(task, executor, interval, interval, unit,
-					cancelled);
-		};
-		return schedule(wrapped, executor, delay, unit, cancelled);
-	}
-
-	private Future<?> scheduleCheckForDueTasks(long delay, TimeUnit unit) {
-		Runnable wakeful = () -> wakeLockManager.runWakefully(
-				this::runDueTasks, "TaskScheduler");
-		return scheduledExecutorService.schedule(wakeful, delay, unit);
-	}
-
-	@Wakeful
-	private void runDueTasks() {
-		long now = SystemClock.elapsedRealtime();
-		List<ScheduledTask> due = new ArrayList<>();
-		synchronized (lock) {
-			while (true) {
-				ScheduledTask s = tasks.peek();
-				if (s == null || s.dueMillis > now) break;
-				due.add(tasks.remove());
-			}
-		}
-		if (LOG.isLoggable(INFO)) {
-			LOG.info("Running " + due.size() + " due tasks");
-		}
-		for (ScheduledTask s : due) {
-			if (LOG.isLoggable(INFO)) {
-				LOG.info("Task is " + (now - s.dueMillis) + " ms overdue");
-			}
-			s.run();
-		}
-	}
-
-	private void scheduleAlarm() {
-		if (SDK_INT >= 23) scheduleIdleAlarm();
-		else scheduleInexactRepeatingAlarm();
-	}
-
-	private void rescheduleAlarm() {
-		// If SDK_INT < 23 the alarm repeats automatically
-		if (SDK_INT >= 23) scheduleIdleAlarm();
-	}
-
-	private void cancelAlarm() {
-		alarmManager.cancel(getAlarmPendingIntent());
-	}
-
-	private void scheduleInexactRepeatingAlarm() {
-		alarmManager.setInexactRepeating(ELAPSED_REALTIME_WAKEUP,
-				SystemClock.elapsedRealtime() + ALARM_MS, ALARM_MS,
-				getAlarmPendingIntent());
-	}
-
-	@TargetApi(23)
-	private void scheduleIdleAlarm() {
-		alarmManager.setAndAllowWhileIdle(ELAPSED_REALTIME_WAKEUP,
-				SystemClock.elapsedRealtime() + ALARM_MS,
-				getAlarmPendingIntent());
-	}
-
-	private PendingIntent getAlarmPendingIntent() {
-		Intent i = new Intent(app, AlarmReceiver.class);
-		i.putExtra(EXTRA_PID, android.os.Process.myPid());
-		return PendingIntent.getBroadcast(app, REQUEST_ALARM, i,
-				FLAG_CANCEL_CURRENT);
-	}
-
-	private class ScheduledTask
-			implements Runnable, Cancellable, Comparable<ScheduledTask> {
-
-		private final Runnable task;
-		private final long dueMillis;
-		private final Future<?> check;
-		private final AtomicBoolean cancelled;
-
-		public ScheduledTask(Runnable task, long dueMillis,
-				Future<?> check, AtomicBoolean cancelled) {
-			this.task = task;
-			this.dueMillis = dueMillis;
-			this.check = check;
-			this.cancelled = cancelled;
-		}
-
-		@Override
-		public void run() {
-			if (!cancelled.get()) task.run();
-		}
-
-		@Override
-		public void cancel() {
-			// Cancel any future executions of this task
-			cancelled.set(true);
-			// Cancel the scheduled check for due tasks
-			check.cancel(false);
-			// Remove the task from the queue
-			synchronized (lock) {
-				tasks.remove(this);
-			}
-		}
-
-		@Override
-		public int compareTo(ScheduledTask s) {
-			//noinspection UseCompareMethod
-			if (dueMillis < s.dueMillis) return -1;
-			if (dueMillis > s.dueMillis) return 1;
-			return 0;
-		}
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidTaskSchedulerModule.java

@@ -1,49 +0,0 @@
-package org.briarproject.bramble.system;
-
-import android.app.Application;
-
-import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.system.AlarmListener;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
-import org.briarproject.bramble.api.system.TaskScheduler;
-
-import java.util.concurrent.ScheduledExecutorService;
-
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class AndroidTaskSchedulerModule {
-
-	public static class EagerSingletons {
-		@Inject
-		AndroidTaskScheduler scheduler;
-	}
-
-	@Provides
-	@Singleton
-	AndroidTaskScheduler provideAndroidTaskScheduler(
-			LifecycleManager lifecycleManager, Application app,
-			AndroidWakeLockManager wakeLockManager,
-			ScheduledExecutorService scheduledExecutorService) {
-		AndroidTaskScheduler scheduler = new AndroidTaskScheduler(app,
-				wakeLockManager, scheduledExecutorService);
-		lifecycleManager.registerService(scheduler);
-		return scheduler;
-	}
-
-	@Provides
-	@Singleton
-	AlarmListener provideAlarmListener(AndroidTaskScheduler scheduler) {
-		return scheduler;
-	}
-
-	@Provides
-	@Singleton
-	TaskScheduler provideTaskScheduler(AndroidTaskScheduler scheduler) {
-		return scheduler;
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidWakeLockImpl.java

@@ -1,74 +0,0 @@
-package org.briarproject.bramble.system;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.AndroidWakeLock;
-
-import java.util.concurrent.atomic.AtomicInteger;
-import java.util.logging.Logger;
-
-import javax.annotation.concurrent.GuardedBy;
-import javax.annotation.concurrent.ThreadSafe;
-
-import static java.util.logging.Level.FINE;
-import static java.util.logging.Logger.getLogger;
-
-/**
- * A wrapper around a {@link SharedWakeLock} that provides the more convenient
- * semantics of {@link AndroidWakeLock} (i.e. calls to acquire() and release()
- * don't need to be balanced).
- */
-@ThreadSafe
-@NotNullByDefault
-class AndroidWakeLockImpl implements AndroidWakeLock {
-
-	private static final Logger LOG =
-			getLogger(AndroidWakeLockImpl.class.getName());
-
-	private static final AtomicInteger INSTANCE_ID = new AtomicInteger(0);
-
-	private final SharedWakeLock sharedWakeLock;
-	private final String tag;
-
-	private final Object lock = new Object();
-	@GuardedBy("lock")
-	private boolean held = false;
-
-	AndroidWakeLockImpl(SharedWakeLock sharedWakeLock, String tag) {
-		this.sharedWakeLock = sharedWakeLock;
-		this.tag = tag + "_" + INSTANCE_ID.getAndIncrement();
-	}
-
-	@Override
-	public void acquire() {
-		synchronized (lock) {
-			if (held) {
-				if (LOG.isLoggable(FINE)) {
-					LOG.fine(tag + " already acquired");
-				}
-			} else {
-				if (LOG.isLoggable(FINE)) {
-					LOG.fine(tag + " acquiring shared wake lock");
-				}
-				held = true;
-				sharedWakeLock.acquire();
-			}
-		}
-	}
-
-	@Override
-	public void release() {
-		synchronized (lock) {
-			if (held) {
-				if (LOG.isLoggable(FINE)) {
-					LOG.fine(tag + " releasing shared wake lock");
-				}
-				held = false;
-				sharedWakeLock.release();
-			} else {
-				if (LOG.isLoggable(FINE)) {
-					LOG.fine(tag + " already released");
-				}
-			}
-		}
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidWakeLockManagerImpl.java

@@ -1,119 +0,0 @@
-package org.briarproject.bramble.system;
-
-import android.app.Application;
-import android.content.Context;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager;
-import android.os.PowerManager;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.AndroidWakeLock;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
-
-import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
-
-import javax.inject.Inject;
-
-import static android.content.Context.POWER_SERVICE;
-import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
-import static java.util.concurrent.TimeUnit.MINUTES;
-import static java.util.concurrent.TimeUnit.SECONDS;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-
-@NotNullByDefault
-class AndroidWakeLockManagerImpl implements AndroidWakeLockManager {
-
-	/**
-	 * How often to replace the wake lock.
-	 */
-	private static final long LOCK_DURATION_MS = MINUTES.toMillis(1);
-
-	/**
-	 * Automatically release the lock this many milliseconds after it's due
-	 * to have been replaced and released.
-	 */
-	private static final long SAFETY_MARGIN_MS = SECONDS.toMillis(30);
-
-	private final SharedWakeLock sharedWakeLock;
-
-	@Inject
-	AndroidWakeLockManagerImpl(Application app,
-			ScheduledExecutorService scheduledExecutorService) {
-		PowerManager powerManager = (PowerManager)
-				requireNonNull(app.getSystemService(POWER_SERVICE));
-		String tag = getWakeLockTag(app);
-		sharedWakeLock = new RenewableWakeLock(powerManager,
-				scheduledExecutorService, PARTIAL_WAKE_LOCK, tag,
-				LOCK_DURATION_MS, SAFETY_MARGIN_MS);
-	}
-
-	@Override
-	public AndroidWakeLock createWakeLock(String tag) {
-		return new AndroidWakeLockImpl(sharedWakeLock, tag);
-	}
-
-	@Override
-	public void runWakefully(Runnable r, String tag) {
-		AndroidWakeLock wakeLock = createWakeLock(tag);
-		wakeLock.acquire();
-		try {
-			r.run();
-		} finally {
-			wakeLock.release();
-		}
-	}
-
-	@Override
-	public void executeWakefully(Runnable r, Executor executor, String tag) {
-		AndroidWakeLock wakeLock = createWakeLock(tag);
-		wakeLock.acquire();
-		try {
-			executor.execute(() -> {
-				try {
-					r.run();
-				} finally {
-					// Release the wake lock if the task throws an exception
-					wakeLock.release();
-				}
-			});
-		} catch (Exception e) {
-			// Release the wake lock if the executor throws an exception when
-			// we submit the task (in which case the release() call above won't
-			// happen)
-			wakeLock.release();
-			throw e;
-		}
-	}
-
-	@Override
-	public void executeWakefully(Runnable r, String tag) {
-		AndroidWakeLock wakeLock = createWakeLock(tag);
-		wakeLock.acquire();
-		try {
-			new Thread(() -> {
-				try {
-					r.run();
-				} finally {
-					wakeLock.release();
-				}
-			}).start();
-		} catch (Exception e) {
-			wakeLock.release();
-			throw e;
-		}
-	}
-
-	private String getWakeLockTag(Context ctx) {
-		PackageManager pm = ctx.getPackageManager();
-		for (PackageInfo info : pm.getInstalledPackages(0)) {
-			String name = info.packageName.toLowerCase();
-			if (name.startsWith("com.huawei.powergenie")) {
-				return "LocationManagerService";
-			} else if (name.startsWith("com.evenwell.powermonitor")) {
-				return "AudioIn";
-			}
-		}
-		return ctx.getPackageName();
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidWakefulIoExecutorModule.java

@@ -1,23 +0,0 @@
-package org.briarproject.bramble.system;
-
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.system.AndroidWakeLockManager;
-import org.briarproject.bramble.api.system.WakefulIoExecutor;
-
-import java.util.concurrent.Executor;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public
-class AndroidWakefulIoExecutorModule {
-
-	@Provides
-	@WakefulIoExecutor
-	Executor provideWakefulIoExecutor(@IoExecutor Executor ioExecutor,
-			AndroidWakeLockManager wakeLockManager) {
-		return r -> wakeLockManager.executeWakefully(r, ioExecutor,
-				"WakefulIoExecutor");
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/system/RenewableWakeLock.java

@@ -1,130 +0,0 @@
-package org.briarproject.bramble.system;
-
-import android.os.PowerManager;
-import android.os.PowerManager.WakeLock;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.concurrent.Future;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
-import javax.annotation.concurrent.ThreadSafe;
-
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static java.util.logging.Level.FINE;
-import static java.util.logging.Level.INFO;
-import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-
-@ThreadSafe
-@NotNullByDefault
-class RenewableWakeLock implements SharedWakeLock {
-
-	private static final Logger LOG =
-			getLogger(RenewableWakeLock.class.getName());
-
-	private final PowerManager powerManager;
-	private final ScheduledExecutorService scheduledExecutorService;
-	private final int levelAndFlags;
-	private final String tag;
-	private final long durationMs, safetyMarginMs;
-
-	private final Object lock = new Object();
-	@GuardedBy("lock")
-	@Nullable
-	private WakeLock wakeLock;
-	@GuardedBy("lock")
-	@Nullable
-	private Future<?> future;
-	@GuardedBy("lock")
-	private int refCount = 0;
-	@GuardedBy("lock")
-	private long acquired = 0;
-
-	RenewableWakeLock(PowerManager powerManager,
-			ScheduledExecutorService scheduledExecutorService,
-			int levelAndFlags,
-			String tag,
-			long durationMs,
-			long safetyMarginMs) {
-		this.powerManager = powerManager;
-		this.scheduledExecutorService = scheduledExecutorService;
-		this.levelAndFlags = levelAndFlags;
-		this.tag = tag;
-		this.durationMs = durationMs;
-		this.safetyMarginMs = safetyMarginMs;
-	}
-
-	@Override
-	public void acquire() {
-		synchronized (lock) {
-			refCount++;
-			if (refCount == 1) {
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Acquiring wake lock " + tag);
-				}
-				wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
-				// We do our own reference counting so we can replace the lock
-				// TODO: Check whether using a ref-counted wake lock affects
-				//  power management apps
-				wakeLock.setReferenceCounted(false);
-				wakeLock.acquire(durationMs + safetyMarginMs);
-				future = scheduledExecutorService.schedule(this::renew,
-						durationMs, MILLISECONDS);
-				acquired = android.os.SystemClock.elapsedRealtime();
-			} else if (LOG.isLoggable(FINE)) {
-				LOG.fine("Wake lock " + tag + " has " + refCount + " holders");
-			}
-		}
-	}
-
-	private void renew() {
-		if (LOG.isLoggable(INFO)) LOG.info("Renewing wake lock " + tag);
-		synchronized (lock) {
-			if (wakeLock == null) {
-				LOG.info("Already released");
-				return;
-			}
-			if (LOG.isLoggable(FINE)) {
-				LOG.fine("Wake lock " + tag + " has " + refCount + " holders");
-			}
-			long now = android.os.SystemClock.elapsedRealtime();
-			long expiry = acquired + durationMs + safetyMarginMs;
-			if (now > expiry && LOG.isLoggable(WARNING)) {
-				LOG.warning("Wake lock expired " + (now - expiry) + " ms ago");
-			}
-			WakeLock oldWakeLock = wakeLock;
-			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
-			wakeLock.setReferenceCounted(false);
-			wakeLock.acquire(durationMs + safetyMarginMs);
-			oldWakeLock.release();
-			future = scheduledExecutorService.schedule(this::renew, durationMs,
-					MILLISECONDS);
-			acquired = now;
-		}
-	}
-
-	@Override
-	public void release() {
-		synchronized (lock) {
-			refCount--;
-			if (refCount == 0) {
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Releasing wake lock " + tag);
-				}
-				requireNonNull(future).cancel(false);
-				future = null;
-				requireNonNull(wakeLock).release();
-				wakeLock = null;
-				acquired = 0;
-			} else if (LOG.isLoggable(FINE)) {
-				LOG.fine("Wake lock " + tag + " has " + refCount + " holders");
-			}
-		}
-	}
-}
-

bramble-android/src/main/java/org/briarproject/bramble/system/SharedWakeLock.java

@@ -1,22 +0,0 @@
-package org.briarproject.bramble.system;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.AndroidWakeLock;
-
-@NotNullByDefault
-interface SharedWakeLock {
-
-	/**
-	 * Acquires the wake lock. This increments the wake lock's reference count,
-	 * so unlike {@link AndroidWakeLock#acquire()} every call to this method
-	 * must be followed by a balancing call to {@link #release()}.
-	 */
-	void acquire();
-
-	/**
-	 * Releases the wake lock. This decrements the wake lock's reference count,
-	 * so unlike {@link AndroidWakeLock#release()} every call to this method
-	 * must follow a balancing call to {@link #acquire()}.
-	 */
-	void release();
-}

bramble-android/src/main/java/org/briarproject/bramble/util/RenewableWakeLock.java

@@ -0,0 +1,100 @@
+package org.briarproject.bramble.util;
+
+import android.os.PowerManager;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.ThreadSafe;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.logging.Level.INFO;
+
+@ThreadSafe
+@NotNullByDefault
+public class RenewableWakeLock {
+
+	private static final Logger LOG =
+			Logger.getLogger(RenewableWakeLock.class.getName());
+
+	/**
+	 * Automatically release the lock this many milliseconds after it's due
+	 * to have been replaced and released.
+	 */
+	private static final int SAFETY_MARGIN_MS = 10_000;
+
+	private final PowerManager powerManager;
+	private final ScheduledExecutorService scheduler;
+	private final int levelAndFlags;
+	private final String tag;
+	private final long durationMs;
+	private final Runnable renewTask;
+
+	private final Object lock = new Object();
+	@Nullable
+	private PowerManager.WakeLock wakeLock; // Locking: lock
+	@Nullable
+	private ScheduledFuture future; // Locking: lock
+
+	public RenewableWakeLock(PowerManager powerManager,
+			ScheduledExecutorService scheduler, int levelAndFlags, String tag,
+			long duration, TimeUnit timeUnit) {
+		this.powerManager = powerManager;
+		this.scheduler = scheduler;
+		this.levelAndFlags = levelAndFlags;
+		this.tag = tag;
+		durationMs = MILLISECONDS.convert(duration, timeUnit);
+		renewTask = this::renew;
+	}
+
+	public void acquire() {
+		if (LOG.isLoggable(INFO)) LOG.info("Acquiring wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock != null) {
+				LOG.info("Already acquired");
+				return;
+			}
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	private void renew() {
+		if (LOG.isLoggable(INFO)) LOG.info("Renewing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			PowerManager.WakeLock oldWakeLock = wakeLock;
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			oldWakeLock.release();
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	public void release() {
+		if (LOG.isLoggable(INFO)) LOG.info("Releasing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			if (future == null) throw new AssertionError();
+			future.cancel(false);
+			future = null;
+			wakeLock.release();
+			wakeLock = null;
+		}
+	}
+}
+

bramble-api/src/main/java/org/briarproject/bramble/api/connection/ConnectionRegistry.java

@@ -1,130 +0,0 @@
-package org.briarproject.bramble.api.connection;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginConfig;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
-import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
-import org.briarproject.bramble.api.plugin.event.ContactConnectedEvent;
-import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
-import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
-import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
-import org.briarproject.bramble.api.sync.Priority;
-
-import java.util.Collection;
-
-/**
- * Keeps track of which contacts are currently connected by which transports.
- */
-@NotNullByDefault
-public interface ConnectionRegistry {
-
-	/**
-	 * Registers an incoming connection from the given contact over the given
-	 * transport. The connection's {@link Priority priority} can be set later
-	 * via {@link #setPriority(ContactId, TransportId, InterruptibleConnection,
-	 * Priority)} if a priority record is received from the contact.
-	 * <p>
-	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
-	 * {@link ContactConnectedEvent} if this is the only connection with the
-	 * contact.
-	 */
-	void registerIncomingConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn);
-
-	/**
-	 * Registers an outgoing connection to the given contact over the given
-	 * transport.
-	 * <p>
-	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
-	 * {@link ContactConnectedEvent} if this is the only connection with the
-	 * contact.
-	 * <p>
-	 * If the registry has any "better" connections with the given contact, the
-	 * given connection will be interrupted. If the registry has any "worse"
-	 * connections with the given contact, those connections will be
-	 * interrupted.
-	 * <p>
-	 * Connection A is considered "better" than connection B if both
-	 * connections have had their priorities set, and either A's transport is
-	 * {@link PluginConfig#getTransportPreferences() preferred} to B's, or
-	 * they use the same transport and A has higher {@link Priority priority}
-	 * than B.
-	 * <p>
-	 * For backward compatibility, connections without priorities are not
-	 * considered better or worse than other connections.
-	 */
-	void registerOutgoingConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, Priority priority);
-
-	/**
-	 * Unregisters a connection with the given contact over the given transport.
-	 * <p>
-	 * Broadcasts {@link ConnectionClosedEvent}. Also broadcasts
-	 * {@link ContactDisconnectedEvent} if this is the only connection with
-	 * the contact.
-	 */
-	void unregisterConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, boolean incoming, boolean exception);
-
-	/**
-	 * Sets the {@link Priority priority} of a connection that was previously
-	 * registered via {@link #registerIncomingConnection(ContactId, TransportId,
-	 * InterruptibleConnection)}.
-	 * <p>
-	 * If the registry has any "better" connections with the given contact, the
-	 * given connection will be interrupted. If the registry has any "worse"
-	 * connections with the given contact, those connections will be
-	 * interrupted.
-	 * <p>
-	 * Connection A is considered "better" than connection B if both
-	 * connections have had their priorities set, and either A's transport is
-	 * {@link PluginConfig#getTransportPreferences() preferred} to B's, or
-	 * they use the same transport and A has higher {@link Priority priority}
-	 * than B.
-	 * <p>
-	 * For backward compatibility, connections without priorities are not
-	 * considered better or worse than other connections.
-	 */
-	void setPriority(ContactId c, TransportId t, InterruptibleConnection conn,
-			Priority priority);
-
-	/**
-	 * Returns any contacts that are connected via the given transport.
-	 */
-	Collection<ContactId> getConnectedContacts(TransportId t);
-
-	/**
-	 * Returns any contacts that are connected via the given transport or any
-	 * {@link PluginConfig#getTransportPreferences() better} transport.
-	 */
-	Collection<ContactId> getConnectedOrBetterContacts(TransportId t);
-
-	/**
-	 * Returns true if the given contact is connected via the given transport.
-	 */
-	boolean isConnected(ContactId c, TransportId t);
-
-	/**
-	 * Returns true if the given contact is connected via any transport.
-	 */
-	boolean isConnected(ContactId c);
-
-	/**
-	 * Registers a connection with the given pending contact. Broadcasts
-	 * {@link RendezvousConnectionOpenedEvent} if this is the only connection
-	 * with the pending contact.
-	 *
-	 * @return True if this is the only connection with the pending contact,
-	 * false if it is redundant and should be closed
-	 */
-	boolean registerConnection(PendingContactId p);
-
-	/**
-	 * Unregisters a connection with the given pending contact. Broadcasts
-	 * {@link RendezvousConnectionClosedEvent}.
-	 */
-	void unregisterConnection(PendingContactId p, boolean success);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/connection/InterruptibleConnection.java

@@ -1,19 +0,0 @@
-package org.briarproject.bramble.api.connection;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-/**
- * A duplex sync connection that can be closed by interrupting its outgoing
- * sync session.
- */
-@NotNullByDefault
-public interface InterruptibleConnection {
-
-	/**
-	 * Interrupts the connection's outgoing sync session. If the underlying
-	 * transport connection is alive and the remote peer is cooperative, this
-	 * should result in both sync sessions ending and the connection being
-	 * cleanly closed.
-	 */
-	void interruptOutgoingSession();
-}

bramble-api/src/main/java/org/briarproject/bramble/api/event/EventBus.java

@@ -18,8 +18,6 @@ public interface EventBus {
 	/**
 	 * Asynchronously notifies all listeners of an event. Listeners are
 	 * notified on the {@link EventExecutor}.
-	 * <p>
-	 * This method can safely be called while holding a lock.
 	 */
 	void broadcast(Event e);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/io/TimeoutMonitor.java

@@ -1,19 +0,0 @@
-package org.briarproject.bramble.api.io;
-
-import java.io.InputStream;
-
-public interface TimeoutMonitor {
-
-	/**
-	 * Returns an {@link InputStream} that wraps the given stream and allows
-	 * read timeouts to be detected.
-	 * <p>
-	 * The returned stream must be {@link InputStream#close() closed} when it's
-	 * no longer needed to ensure that resources held by the timeout monitor
-	 * are released.
-	 *
-	 * @param timeoutMs The read timeout in milliseconds. Timeouts will be
-	 * detected eventually but are not guaranteed to be detected immediately.
-	 */
-	InputStream createTimeoutInputStream(InputStream in, long timeoutMs);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/LifecycleManager.java

@@ -5,7 +5,6 @@ import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.Wakeful;
 
 import java.util.concurrent.ExecutorService;
 
@@ -66,7 +65,6 @@ public interface LifecycleManager {
 	 * Opens the {@link DatabaseComponent} using the given key and starts any
 	 * registered {@link Service Services}.
 	 */
-	@Wakeful
 	StartResult startServices(SecretKey dbKey);
 
 	/**
@@ -74,7 +72,6 @@ public interface LifecycleManager {
 	 * registered {@link ExecutorService ExecutorServices}, and closes the
 	 * {@link DatabaseComponent}.
 	 */
-	@Wakeful
 	void stopServices();
 
 	/**
@@ -107,7 +104,6 @@ public interface LifecycleManager {
 		 *
 		 * @param txn A read-write transaction
 		 */
-		@Wakeful
 		void onDatabaseOpened(Transaction txn) throws DbException;
 	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/Service.java

@@ -1,20 +1,16 @@
 package org.briarproject.bramble.api.lifecycle;
 
-import org.briarproject.bramble.api.system.Wakeful;
-
 public interface Service {
 
 	/**
-	 * Starts the service. This method must not be called concurrently with
+	 * Starts the service.This method must not be called concurrently with
 	 * {@link #stopService()}.
 	 */
-	@Wakeful
 	void startService() throws ServiceException;
 
 	/**
 	 * Stops the service. This method must not be called concurrently with
 	 * {@link #startService()}.
 	 */
-	@Wakeful
 	void stopService() throws ServiceException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/BluetoothConstants.java

@@ -6,16 +6,8 @@ public interface BluetoothConstants {
 
 	int UUID_BYTES = 16;
 
-	// Transport properties
 	String PROP_ADDRESS = "address";
 	String PROP_UUID = "uuid";
 
-	// Local settings (not shared with contacts)
+	String PREF_BT_ENABLE = "enable";
-	String PREF_ADDRESS_IS_REFLECTED = "addressIsReflected";
-	String PREF_EVER_CONNECTED = "everConnected";
-
-	// Default values for local settings
-	boolean DEFAULT_PREF_PLUGIN_ENABLE = false;
-	boolean DEFAULT_PREF_ADDRESS_IS_REFLECTED = false;
-	boolean DEFAULT_PREF_EVER_CONNECTED = false;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/ConnectionManager.java

@@ -1,11 +1,8 @@
-package org.briarproject.bramble.api.connection;
+package org.briarproject.bramble.api.plugin;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.PendingContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 
 @NotNullByDefault

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/ConnectionRegistry.java

@@ -0,0 +1,66 @@
+package org.briarproject.bramble.api.plugin;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.PendingContactId;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
+import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
+import org.briarproject.bramble.api.plugin.event.ConnectionStatusChangedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
+
+import java.util.Collection;
+
+/**
+ * Keeps track of which contacts are currently connected by which transports.
+ */
+@NotNullByDefault
+public interface ConnectionRegistry {
+
+	/**
+	 * Registers a connection with the given contact over the given transport.
+	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
+	 * {@link ConnectionStatusChangedEvent} if this is the only connection with
+	 * the contact.
+	 */
+	void registerConnection(ContactId c, TransportId t, boolean incoming);
+
+	/**
+	 * Unregisters a connection with the given contact over the given transport.
+	 * Broadcasts {@link ConnectionClosedEvent}. Also broadcasts
+	 * {@link ConnectionStatusChangedEvent} if this is the only connection with
+	 * the contact.
+	 */
+	void unregisterConnection(ContactId c, TransportId t, boolean incoming);
+
+	/**
+	 * Returns any contacts that are connected via the given transport.
+	 */
+	Collection<ContactId> getConnectedContacts(TransportId t);
+
+	/**
+	 * Returns true if the given contact is connected via the given transport.
+	 */
+	boolean isConnected(ContactId c, TransportId t);
+
+	/**
+	 * Returns the connection status of the given contact via all transports.
+	 */
+	ConnectionStatus getConnectionStatus(ContactId c);
+
+	/**
+	 * Registers a connection with the given pending contact. Broadcasts
+	 * {@link RendezvousConnectionOpenedEvent} if this is the only connection
+	 * with the pending contact.
+	 *
+	 * @return True if this is the only connection with the pending contact,
+	 * false if it is redundant and should be closed
+	 */
+	boolean registerConnection(PendingContactId p);
+
+	/**
+	 * Unregisters a connection with the given pending contact. Broadcasts
+	 * {@link RendezvousConnectionClosedEvent}.
+	 */
+	void unregisterConnection(PendingContactId p, boolean success);
+}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/ConnectionStatus.java

@@ -0,0 +1,5 @@
+package org.briarproject.bramble.api.plugin;
+
+public enum ConnectionStatus {
+	CONNECTED, RECENTLY_CONNECTED, DISCONNECTED
+}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/LanTcpConstants.java

@@ -7,12 +7,7 @@ public interface LanTcpConstants {
 	// Transport properties (shared with contacts)
 	String PROP_IP_PORTS = "ipPorts";
 	String PROP_PORT = "port";
-	String PROP_IPV6 = "ipv6";
 
-	// Local settings (not shared with contacts)
+	// A local setting
 	String PREF_LAN_IP_PORTS = "ipPorts";
-	String PREF_IPV6 = "ipv6";
-
-	// Default value for PREF_PLUGIN_ENABLE
-	boolean DEFAULT_PREF_PLUGIN_ENABLE = true;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/Plugin.java

@@ -3,56 +3,12 @@ package org.briarproject.bramble.api.plugin;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.properties.TransportProperties;
-import org.briarproject.bramble.api.settings.SettingsManager;
-import org.briarproject.bramble.api.system.Wakeful;
 
 import java.util.Collection;
 
 @NotNullByDefault
 public interface Plugin {
 
-	enum State {
-
-		/**
-		 * The plugin has not finished starting or has been stopped.
-		 */
-		STARTING_STOPPING,
-
-		/**
-		 * The plugin is disabled by settings. Use {@link #getReasonsDisabled()}
-		 * to find out which settings are responsible.
-		 */
-		DISABLED,
-
-		/**
-		 * The plugin is being enabled and can't yet make or receive
-		 * connections.
-		 */
-		ENABLING,
-
-		/**
-		 * The plugin is enabled and can make or receive connections.
-		 */
-		ACTIVE,
-
-		/**
-		 * The plugin is enabled but can't make or receive connections
-		 */
-		INACTIVE
-	}
-
-	/**
-	 * The string for the boolean preference
-	 * to use with the {@link SettingsManager} to enable or disable the plugin.
-	 */
-	String PREF_PLUGIN_ENABLE = "enable";
-
-	/**
-	 * Reason flag returned by {@link #getReasonsDisabled()} to indicate that
-	 * the plugin has been disabled by the user.
-	 */
-	int REASON_USER = 1;
-
 	/**
 	 * Returns the plugin's transport identifier.
 	 */
@@ -71,28 +27,17 @@ public interface Plugin {
 	/**
 	 * Starts the plugin.
 	 */
-	@Wakeful
 	void start() throws PluginException;
 
 	/**
 	 * Stops the plugin.
 	 */
-	@Wakeful
 	void stop() throws PluginException;
 
 	/**
-	 * Returns the current state of the plugin.
+	 * Returns true if the plugin is running.
 	 */
-	State getState();
+	boolean isRunning();
-
-	/**
-	 * Returns a set of flags indicating why the plugin is
-	 * {@link State#DISABLED disabled}, or 0 if the plugin is not disabled.
-	 * <p>
-	 * The flags used are plugin-specific, except the generic flag
-	 * {@link #REASON_USER}, which may be used by any plugin.
-	 */
-	int getReasonsDisabled();
 
 	/**
 	 * Returns true if the plugin should be polled periodically to attempt to
@@ -109,7 +54,6 @@ public interface Plugin {
 	 * Attempts to create connections using the given transport properties,
 	 * passing any created connections to the corresponding handlers.
 	 */
-	@Wakeful
 	void poll(Collection<Pair<TransportProperties, ConnectionHandler>>
 			properties);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/PluginCallback.java

@@ -1,15 +1,9 @@
 package org.briarproject.bramble.api.plugin;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
-import org.briarproject.bramble.api.plugin.event.TransportStateEvent;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
 
-import java.util.Collection;
-
 /**
  * An interface through which a transport plugin interacts with the rest of
  * the application.
@@ -27,11 +21,6 @@ public interface PluginCallback extends ConnectionHandler {
 	 */
 	TransportProperties getLocalProperties();
 
-	/**
-	 * Returns the plugin's remote transport properties.
-	 */
-	Collection<TransportProperties> getRemoteProperties();
-
 	/**
 	 * Merges the given settings with the plugin's settings
 	 */
@@ -43,17 +32,12 @@ public interface PluginCallback extends ConnectionHandler {
 	void mergeLocalProperties(TransportProperties p);
 
 	/**
-	 * Informs the callback of the plugin's current state.
+	 * Signals that the transport is enabled.
-	 * <p>
-	 * If the current state is different from the previous state, the callback
-	 * will broadcast a {@link TransportStateEvent}. If the current state is
-	 * {@link State#ACTIVE} and the previous state was not
-	 * {@link State#ACTIVE}, the callback will broadcast a
-	 * {@link TransportActiveEvent}. If the current state is not
-	 * {@link State#ACTIVE} and the previous state was {@link State#ACTIVE},
-	 * the callback will broadcast a {@link TransportInactiveEvent}.
-	 * <p>
-	 * This method can safely be called while holding a lock.
 	 */
-	void pluginStateChanged(State state);
+	void transportEnabled();
+
+	/**
+	 * Signals that the transport is disabled.
+	 */
+	void transportDisabled();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/PluginConfig.java

@@ -5,8 +5,6 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 
 import java.util.Collection;
-import java.util.List;
-import java.util.Map;
 
 @NotNullByDefault
 public interface PluginConfig {
@@ -16,11 +14,4 @@ public interface PluginConfig {
 	Collection<SimplexPluginFactory> getSimplexFactories();
 
 	boolean shouldPoll();
-
-	/**
-	 * Returns a map representing transport preferences. For each entry in the
-	 * map, connections via the transports identified by the value are
-	 * preferred to connections via the transport identified by the key.
-	 */
-	Map<TransportId, List<TransportId>> getTransportPreferences();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/PluginManager.java

@@ -41,17 +41,4 @@ public interface PluginManager {
 	 * Returns any duplex plugins that support rendezvous.
 	 */
 	Collection<DuplexPlugin> getRendezvousPlugins();
-
-	/**
-	 * Enables or disables the plugin
-	 * identified by the given {@link TransportId}.
-	 * <p>
-	 * Note that this applies the change asynchronously
-	 * and there are no order guarantees.
-	 * <p>
-	 * If no plugin with the given {@link TransportId} is registered,
-	 * this is a no-op.
-	 */
-	void setPluginEnabled(TransportId t, boolean enabled);
-
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TorConstants.java

@@ -1,12 +1,9 @@
 package org.briarproject.bramble.api.plugin;
 
-import static java.util.concurrent.TimeUnit.DAYS;
-
 public interface TorConstants {
 
 	TransportId ID = new TransportId("org.briarproject.bramble.tor");
 
-	// Transport properties
 	String PROP_ONION_V2 = "onion";
 	String PROP_ONION_V3 = "onion3";
 
@@ -16,45 +13,14 @@ public interface TorConstants {
 	int CONNECT_TO_PROXY_TIMEOUT = 5000; // Milliseconds
 	int EXTRA_SOCKET_TIMEOUT = 30000; // Milliseconds
 
-	// Local settings (not shared with contacts)
 	String PREF_TOR_NETWORK = "network2";
 	String PREF_TOR_PORT = "port";
 	String PREF_TOR_MOBILE = "useMobileData";
 	String PREF_TOR_ONLY_WHEN_CHARGING = "onlyWhenCharging";
-	String HS_PRIVATE_KEY_V2 = "onionPrivKey";
-	String HS_PRIVATE_KEY_V3 = "onionPrivKey3";
-	String HS_V3_CREATED = "onionPrivKey3Created";
 
-	/**
-	 * How long to publish a v3 hidden service before retiring the v2 service.
-	 */
-	long V3_MIGRATION_PERIOD_MS = DAYS.toMillis(180);
-
-	// Values for PREF_TOR_NETWORK
 	int PREF_TOR_NETWORK_AUTOMATIC = 0;
 	int PREF_TOR_NETWORK_WITHOUT_BRIDGES = 1;
 	int PREF_TOR_NETWORK_WITH_BRIDGES = 2;
-	// TODO: Remove when settings migration code is removed
 	int PREF_TOR_NETWORK_NEVER = 3;
 
-	// Default values for local settings
-	boolean DEFAULT_PREF_PLUGIN_ENABLE = true;
-	int DEFAULT_PREF_TOR_NETWORK = PREF_TOR_NETWORK_AUTOMATIC;
-	boolean DEFAULT_PREF_TOR_MOBILE = true;
-	boolean DEFAULT_PREF_TOR_ONLY_WHEN_CHARGING = false;
-
-	/**
-	 * Reason flag returned by {@link Plugin#getReasonsDisabled()}.
-	 */
-	int REASON_BATTERY = 2;
-
-	/**
-	 * Reason flag returned by {@link Plugin#getReasonsDisabled()}.
-	 */
-	int REASON_MOBILE_DATA = 4;
-
-	/**
-	 * Reason flag returned by {@link Plugin#getReasonsDisabled()}.
-	 */
-	int REASON_COUNTRY_BLOCKED = 8;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/WanTcpConstants.java

@@ -4,7 +4,4 @@ public interface WanTcpConstants {
 
 	TransportId ID = new TransportId("org.briarproject.bramble.wan");
 
-	// Default value for PREF_PLUGIN_ENABLE
-	boolean DEFAULT_PREF_PLUGIN_ENABLE = false;
 }
-

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/DuplexPlugin.java

@@ -8,7 +8,6 @@ import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.rendezvous.KeyMaterialSource;
 import org.briarproject.bramble.api.rendezvous.RendezvousEndpoint;
-import org.briarproject.bramble.api.system.Wakeful;
 
 import javax.annotation.Nullable;
 
@@ -22,7 +21,6 @@ public interface DuplexPlugin extends Plugin {
 	 * Attempts to create and return a connection using the given transport
 	 * properties. Returns null if a connection cannot be created.
 	 */
-	@Wakeful
 	@Nullable
 	DuplexTransportConnection createConnection(TransportProperties p);
 

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/BluetoothEnabledEvent.java

@@ -0,0 +1,15 @@
+package org.briarproject.bramble.api.plugin.event;
+
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that informs the Bluetooth plugin that we have enabled the
+ * Bluetooth adapter.
+ */
+@Immutable
+@NotNullByDefault
+public class BluetoothEnabledEvent extends Event {
+}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/ConnectionClosedEvent.java

@@ -13,14 +13,13 @@ public class ConnectionClosedEvent extends Event {
 
 	private final ContactId contactId;
 	private final TransportId transportId;
-	private final boolean incoming, exception;
+	private final boolean incoming;
 
 	public ConnectionClosedEvent(ContactId contactId, TransportId transportId,
-			boolean incoming, boolean exception) {
+			boolean incoming) {
 		this.contactId = contactId;
 		this.transportId = transportId;
 		this.incoming = incoming;
-		this.exception = exception;
 	}
 
 	public ContactId getContactId() {
@@ -34,8 +33,4 @@ public class ConnectionClosedEvent extends Event {
 	public boolean isIncoming() {
 		return incoming;
 	}
-
-	public boolean isException() {
-		return exception;
-	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/ConnectionStatusChangedEvent.java

@@ -3,24 +3,31 @@ package org.briarproject.bramble.api.plugin.event;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.ConnectionStatus;
 
 import javax.annotation.concurrent.Immutable;
 
 /**
- * An event that is broadcast when a contact connects that was not previously
+ * An event that is broadcast when a contact's connection status changes.
- * connected via any transport.
  */
 @Immutable
 @NotNullByDefault
-public class ContactConnectedEvent extends Event {
+public class ConnectionStatusChangedEvent extends Event {
 
 	private final ContactId contactId;
+	private final ConnectionStatus status;
 
-	public ContactConnectedEvent(ContactId contactId) {
+	public ConnectionStatusChangedEvent(ContactId contactId,
+			ConnectionStatus status) {
 		this.contactId = contactId;
+		this.status = status;
 	}
 
 	public ContactId getContactId() {
 		return contactId;
 	}
+
+	public ConnectionStatus getConnectionStatus() {
+		return status;
+	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/ContactDisconnectedEvent.java

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.api.plugin.event;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when a contact disconnects and is no longer
- * connected via any transport.
- */
-@Immutable
-@NotNullByDefault
-public class ContactDisconnectedEvent extends Event {
-
-	private final ContactId contactId;
-
-	public ContactDisconnectedEvent(ContactId contactId) {
-		this.contactId = contactId;
-	}
-
-	public ContactId getContactId() {
-		return contactId;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/DisableBluetoothEvent.java

@@ -0,0 +1,15 @@
+package org.briarproject.bramble.api.plugin.event;
+
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that asks the Bluetooth plugin to disable the Bluetooth adapter if
+ * we previously enabled it.
+ */
+@Immutable
+@NotNullByDefault
+public class DisableBluetoothEvent extends Event {
+}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/EnableBluetoothEvent.java

@@ -0,0 +1,14 @@
+package org.briarproject.bramble.api.plugin.event;
+
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that asks the Bluetooth plugin to enable the Bluetooth adapter.
+ */
+@Immutable
+@NotNullByDefault
+public class EnableBluetoothEvent extends Event {
+}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/TransportDisabledEvent.java

@@ -2,22 +2,20 @@ package org.briarproject.bramble.api.plugin.event;
 
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.TransportId;
 
 import javax.annotation.concurrent.Immutable;
 
 /**
- * An event that is broadcast when a plugin enters the {@link State#ACTIVE}
+ * An event that is broadcast when a transport is disabled.
- * state.
  */
 @Immutable
 @NotNullByDefault
-public class TransportActiveEvent extends Event {
+public class TransportDisabledEvent extends Event {
 
 	private final TransportId transportId;
 
-	public TransportActiveEvent(TransportId transportId) {
+	public TransportDisabledEvent(TransportId transportId) {
 		this.transportId = transportId;
 	}
 

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/TransportEnabledEvent.java

@@ -2,22 +2,20 @@ package org.briarproject.bramble.api.plugin.event;
 
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.TransportId;
 
 import javax.annotation.concurrent.Immutable;
 
 /**
- * An event that is broadcast when a plugin leaves the {@link State#ACTIVE}
+ * An event that is broadcast when a transport is enabled.
- * state.
  */
 @Immutable
 @NotNullByDefault
-public class TransportInactiveEvent extends Event {
+public class TransportEnabledEvent extends Event {
 
 	private final TransportId transportId;
 
-	public TransportInactiveEvent(TransportId transportId) {
+	public TransportEnabledEvent(TransportId transportId) {
 		this.transportId = transportId;
 	}
 

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/TransportStateEvent.java

@@ -1,32 +0,0 @@
-package org.briarproject.bramble.api.plugin.event;
-
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
-import org.briarproject.bramble.api.plugin.TransportId;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when the {@link State state} of a plugin changes.
- */
-@Immutable
-@NotNullByDefault
-public class TransportStateEvent extends Event {
-
-	private final TransportId transportId;
-	private final State state;
-
-	public TransportStateEvent(TransportId transportId, State state) {
-		this.transportId = transportId;
-		this.state = state;
-	}
-
-	public TransportId getTransportId() {
-		return transportId;
-	}
-
-	public State getState() {
-		return state;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/simplex/SimplexPlugin.java

@@ -5,7 +5,6 @@ import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
 import org.briarproject.bramble.api.properties.TransportProperties;
-import org.briarproject.bramble.api.system.Wakeful;
 
 import javax.annotation.Nullable;
 
@@ -19,7 +18,6 @@ public interface SimplexPlugin extends Plugin {
 	 * Attempts to create and return a reader for the given transport
 	 * properties. Returns null if a reader cannot be created.
 	 */
-	@Wakeful
 	@Nullable
 	TransportConnectionReader createReader(TransportProperties p);
 
@@ -27,7 +25,6 @@ public interface SimplexPlugin extends Plugin {
 	 * Attempts to create and return a writer for the given transport
 	 * properties. Returns null if a writer cannot be created.
 	 */
-	@Wakeful
 	@Nullable
 	TransportConnectionWriter createWriter(TransportProperties p);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/properties/TransportPropertyConstants.java

@@ -12,11 +12,6 @@ public interface TransportPropertyConstants {
 	 */
 	int MAX_PROPERTY_LENGTH = 100;
 
-	/**
-	 * Prefix for keys that represent reflected properties.
-	 */
-	String REFLECTED_PROPERTY_PREFIX = "u:";
-
 	/**
 	 * Message metadata key for the transport ID of a local or remote update,
 	 * as a BDF string.

bramble-api/src/main/java/org/briarproject/bramble/api/properties/event/RemoteTransportPropertiesUpdatedEvent.java

@@ -1,27 +0,0 @@
-package org.briarproject.bramble.api.properties.event;
-
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.properties.TransportProperties;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when {@link TransportProperties} are received
- * from a contact.
- */
-@Immutable
-@NotNullByDefault
-public class RemoteTransportPropertiesUpdatedEvent extends Event {
-
-	private final TransportId transportId;
-
-	public RemoteTransportPropertiesUpdatedEvent(TransportId transportId) {
-		this.transportId = transportId;
-	}
-
-	public TransportId getTransportId() {
-		return transportId;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/sync/Priority.java

@@ -1,23 +0,0 @@
-package org.briarproject.bramble.api.sync;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * A record containing a nonce for choosing between redundant sessions.
- */
-@Immutable
-@NotNullByDefault
-public class Priority {
-
-	private final byte[] nonce;
-
-	public Priority(byte[] nonce) {
-		this.nonce = nonce;
-	}
-
-	public byte[] getNonce() {
-		return nonce;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/sync/PriorityHandler.java

@@ -1,13 +0,0 @@
-package org.briarproject.bramble.api.sync;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-/**
- * An interface for handling a {@link Priority} record received by an
- * incoming {@link SyncSession}.
- */
-@NotNullByDefault
-public interface PriorityHandler {
-
-	void handle(Priority p);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/sync/RecordTypes.java

@@ -10,5 +10,4 @@ public interface RecordTypes {
 	byte OFFER = 2;
 	byte REQUEST = 3;
 	byte VERSIONS = 4;
-	byte PRIORITY = 5;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncConstants.java

@@ -49,10 +49,4 @@ public interface SyncConstants {
 	 * simultaneously.
 	 */
 	int MAX_SUPPORTED_VERSIONS = 10;
-
-	/**
-	 * The length of the priority nonce used for choosing between redundant
-	 * connections.
-	 */
-	int PRIORITY_NONCE_BYTES = 16;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordReader.java

@@ -28,8 +28,4 @@ public interface SyncRecordReader {
 	boolean hasVersions() throws IOException;
 
 	Versions readVersions() throws IOException;
-
-	boolean hasPriority() throws IOException;
-
-	Priority readPriority() throws IOException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordWriter.java

@@ -17,7 +17,5 @@ public interface SyncRecordWriter {
 
 	void writeVersions(Versions v) throws IOException;
 
-	void writePriority(Priority p) throws IOException;
-
 	void flush() throws IOException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncSessionFactory.java

@@ -2,23 +2,18 @@ package org.briarproject.bramble.api.sync;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.InputStream;
 
-import javax.annotation.Nullable;
-
 @NotNullByDefault
 public interface SyncSessionFactory {
 
-	SyncSession createIncomingSession(ContactId c, InputStream in,
+	SyncSession createIncomingSession(ContactId c, InputStream in);
-			PriorityHandler handler);
 
-	SyncSession createSimplexOutgoingSession(ContactId c, TransportId t,
+	SyncSession createSimplexOutgoingSession(ContactId c, int maxLatency,
-			int maxLatency, StreamWriter streamWriter);
+			StreamWriter streamWriter);
 
-	SyncSession createDuplexOutgoingSession(ContactId c, TransportId t,
+	SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxLatency, int maxIdleTime, StreamWriter streamWriter,
+			int maxIdleTime, StreamWriter streamWriter);
-			@Nullable Priority priority);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/event/CloseSyncConnectionsEvent.java

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.api.sync.event;
-
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportId;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when all sync connections using a given
- * transport should be closed.
- */
-@Immutable
-@NotNullByDefault
-public class CloseSyncConnectionsEvent extends Event {
-
-	private final TransportId transportId;
-
-	public CloseSyncConnectionsEvent(TransportId transportId) {
-		this.transportId = transportId;
-	}
-
-	public TransportId getTransportId() {
-		return transportId;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/system/Scheduler.java

@@ -1,6 +1,5 @@
-package org.briarproject.bramble.api.plugin;
+package org.briarproject.bramble.api.system;
 
-import java.io.File;
 import java.lang.annotation.Retention;
 import java.lang.annotation.Target;
 
@@ -12,11 +11,15 @@ import static java.lang.annotation.ElementType.PARAMETER;
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
 /**
- * Annotation for injecting the {@link File directory} where the Tor plugin
+ * Annotation for injecting a scheduled executor service
- * should store its state.
+ * that can be used to schedule the execution of tasks.
+ * <p>
+ * The service should <b>only</b> be used for running tasks on other executors
+ * at scheduled times.
+ * No significant work should be run by the service itself!
  */
 @Qualifier
 @Target({FIELD, METHOD, PARAMETER})
 @Retention(RUNTIME)
-public @interface TorDirectory {
+public @interface Scheduler {
-}
+}

bramble-api/src/main/java/org/briarproject/bramble/api/system/TaskScheduler.java

@@ -1,43 +0,0 @@
-package org.briarproject.bramble.api.system;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.concurrent.Executor;
-import java.util.concurrent.TimeUnit;
-
-/**
- * A service that can be used to schedule the execution of tasks.
- */
-@NotNullByDefault
-public interface TaskScheduler {
-
-	/**
-	 * Submits the given task to the given executor after the given delay.
-	 * <p>
-	 * If the platform supports wake locks, a wake lock will be held while
-	 * submitting and running the task.
-	 */
-	Cancellable schedule(Runnable task, Executor executor, long delay,
-			TimeUnit unit);
-
-	/**
-	 * Submits the given task to the given executor after the given delay,
-	 * and then repeatedly with the given interval between executions
-	 * (measured from the end of one execution to the beginning of the next).
-	 * <p>
-	 * If the platform supports wake locks, a wake lock will be held while
-	 * submitting and running the task.
-	 */
-	Cancellable scheduleWithFixedDelay(Runnable task, Executor executor,
-			long delay, long interval, TimeUnit unit);
-
-	interface Cancellable {
-
-		/**
-		 * Cancels the task if it has not already started running. If the task
-		 * is {@link #scheduleWithFixedDelay(Runnable, Executor, long, long, TimeUnit) periodic},
-		 * all future executions of the task are cancelled.
-		 */
-		void cancel();
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/system/Wakeful.java

@@ -1,19 +0,0 @@
-package org.briarproject.bramble.api.system;
-
-import java.lang.annotation.Retention;
-import java.lang.annotation.Target;
-
-import javax.inject.Qualifier;
-
-import static java.lang.annotation.ElementType.METHOD;
-import static java.lang.annotation.RetentionPolicy.RUNTIME;
-
-/**
- * Annotation for methods that must be called while holding a wake lock, if
- * the platform supports wake locks.
- */
-@Qualifier
-@Target(METHOD)
-@Retention(RUNTIME)
-public @interface Wakeful {
-}

bramble-api/src/main/java/org/briarproject/bramble/api/system/WakefulIoExecutor.java

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.api.system;
-
-import java.lang.annotation.Retention;
-import java.lang.annotation.Target;
-
-import javax.inject.Qualifier;
-
-import static java.lang.annotation.ElementType.FIELD;
-import static java.lang.annotation.ElementType.METHOD;
-import static java.lang.annotation.ElementType.PARAMETER;
-import static java.lang.annotation.RetentionPolicy.RUNTIME;
-
-/**
- * Annotation for injecting the executor for long-running IO tasks that should
- * run without sleeping. Also used for annotating methods that should run on
- * this executor.
- * <p>
- * The contract of this executor is that tasks may be run concurrently, and
- * submitting a task will never block. Tasks must not run indefinitely. Tasks
- * submitted during shutdown are discarded.
- */
-@Qualifier
-@Target({FIELD, METHOD, PARAMETER})
-@Retention(RUNTIME)
-public @interface WakefulIoExecutor {
-}

bramble-api/src/main/java/org/briarproject/bramble/util/PrivacyUtils.java

@@ -2,17 +2,13 @@ package org.briarproject.bramble.util;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
-import java.net.Inet4Address;
+import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 
 import javax.annotation.Nullable;
 
-import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
-import static org.briarproject.bramble.util.StringUtils.isValidMac;
-import static org.briarproject.bramble.util.StringUtils.toHexString;
-
 @NotNullByDefault
 public class PrivacyUtils {
 
@@ -23,7 +19,7 @@ public class PrivacyUtils {
 
 	@Nullable
 	public static String scrubMacAddress(@Nullable String address) {
-		if (isNullOrEmpty(address) || !isValidMac(address)) return address;
+		if (address == null || address.length() == 0) return null;
 		// this is a fake address we need to know about
 		if (address.equals("02:00:00:00:00:00")) return address;
 		// keep first and last octet of MAC address
@@ -31,37 +27,39 @@ public class PrivacyUtils {
 				+ address.substring(14, 17);
 	}
 
+	@Nullable
 	public static String scrubInetAddress(InetAddress address) {
-		if (address instanceof Inet4Address) {
+		// don't scrub link and site local addresses
-			// Don't scrub local IPv4 addresses
+		if (address.isLinkLocalAddress() || address.isSiteLocalAddress())
-			if (address.isLoopbackAddress() || address.isLinkLocalAddress() ||
+			return address.toString();
-					address.isSiteLocalAddress()) {
+		// completely scrub IPv6 addresses
-				return address.getHostAddress();
+		if (address instanceof Inet6Address) return "[scrubbed]";
-			}
+		// keep first and last octet of IPv4 addresses
-			// Keep first and last octet of non-local IPv4 addresses
+		return scrubInetAddress(address.toString());
-			return scrubIpv4Address(address.getAddress());
-		} else {
-			// Keep first and last octet of IPv6 addresses
-			return scrubIpv6Address(address.getAddress());
-		}
 	}
 
-	private static String scrubIpv4Address(byte[] ipv4) {
+	@Nullable
-		return (ipv4[0] & 0xFF) + ".[scrubbed]." + (ipv4[3] & 0xFF);
+	public static String scrubInetAddress(@Nullable String address) {
-	}
+		if (address == null) return null;
-
+
-	private static String scrubIpv6Address(byte[] ipv6) {
+		int firstDot = address.indexOf(".");
-		String hex = toHexString(ipv6).toLowerCase();
+		if (firstDot == -1) return "[scrubbed]";
-		return hex.substring(0, 2) + "[scrubbed]" + hex.substring(30);
+		String prefix = address.substring(0, firstDot + 1);
+		int lastDot = address.lastIndexOf(".");
+		String suffix = address.substring(lastDot, address.length());
+		return prefix + "[scrubbed]" + suffix;
 	}
 
+	@Nullable
 	public static String scrubSocketAddress(InetSocketAddress address) {
-		return scrubInetAddress(address.getAddress());
+		InetAddress inetAddress = address.getAddress();
+		return scrubInetAddress(inetAddress);
 	}
 
+	@Nullable
 	public static String scrubSocketAddress(SocketAddress address) {
 		if (address instanceof InetSocketAddress)
 			return scrubSocketAddress((InetSocketAddress) address);
-		return "[scrubbed]";
+		return scrubInetAddress(address.toString());
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreEagerSingletons.java

@@ -9,6 +9,7 @@ import org.briarproject.bramble.plugin.PluginModule;
 import org.briarproject.bramble.properties.PropertiesModule;
 import org.briarproject.bramble.rendezvous.RendezvousModule;
 import org.briarproject.bramble.sync.validation.ValidationModule;
+import org.briarproject.bramble.system.SystemModule;
 import org.briarproject.bramble.transport.TransportModule;
 import org.briarproject.bramble.versioning.VersioningModule;
 
@@ -30,6 +31,8 @@ public interface BrambleCoreEagerSingletons {
 
 	void inject(RendezvousModule.EagerSingletons init);
 
+	void inject(SystemModule.EagerSingletons init);
+
 	void inject(TransportModule.EagerSingletons init);
 
 	void inject(ValidationModule.EagerSingletons init);
@@ -47,6 +50,7 @@ public interface BrambleCoreEagerSingletons {
 			c.inject(new RendezvousModule.EagerSingletons());
 			c.inject(new PluginModule.EagerSingletons());
 			c.inject(new PropertiesModule.EagerSingletons());
+			c.inject(new SystemModule.EagerSingletons());
 			c.inject(new TransportModule.EagerSingletons());
 			c.inject(new ValidationModule.EagerSingletons());
 			c.inject(new VersioningModule.EagerSingletons());

bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java

@@ -1,7 +1,6 @@
 package org.briarproject.bramble;
 
 import org.briarproject.bramble.client.ClientModule;
-import org.briarproject.bramble.connection.ConnectionModule;
 import org.briarproject.bramble.contact.ContactModule;
 import org.briarproject.bramble.crypto.CryptoExecutorModule;
 import org.briarproject.bramble.crypto.CryptoModule;
@@ -10,7 +9,6 @@ import org.briarproject.bramble.db.DatabaseExecutorModule;
 import org.briarproject.bramble.db.DatabaseModule;
 import org.briarproject.bramble.event.EventModule;
 import org.briarproject.bramble.identity.IdentityModule;
-import org.briarproject.bramble.io.IoModule;
 import org.briarproject.bramble.keyagreement.KeyAgreementModule;
 import org.briarproject.bramble.lifecycle.LifecycleModule;
 import org.briarproject.bramble.plugin.PluginModule;
@@ -21,7 +19,7 @@ import org.briarproject.bramble.rendezvous.RendezvousModule;
 import org.briarproject.bramble.settings.SettingsModule;
 import org.briarproject.bramble.sync.SyncModule;
 import org.briarproject.bramble.sync.validation.ValidationModule;
-import org.briarproject.bramble.system.ClockModule;
+import org.briarproject.bramble.system.SystemModule;
 import org.briarproject.bramble.transport.TransportModule;
 import org.briarproject.bramble.versioning.VersioningModule;
 
@@ -29,8 +27,6 @@ import dagger.Module;
 
 @Module(includes = {
 		ClientModule.class,
-		ClockModule.class,
-		ConnectionModule.class,
 		ContactModule.class,
 		CryptoModule.class,
 		CryptoExecutorModule.class,
@@ -39,7 +35,6 @@ import dagger.Module;
 		DatabaseExecutorModule.class,
 		EventModule.class,
 		IdentityModule.class,
-		IoModule.class,
 		KeyAgreementModule.class,
 		LifecycleModule.class,
 		PluginModule.class,
@@ -49,6 +44,7 @@ import dagger.Module;
 		RendezvousModule.class,
 		SettingsModule.class,
 		SyncModule.class,
+		SystemModule.class,
 		TransportModule.class,
 		ValidationModule.class,
 		VersioningModule.class

bramble-core/src/main/java/org/briarproject/bramble/connection/Connection.java

@@ -1,79 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
-
-import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
-import static org.briarproject.bramble.util.IoUtils.read;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-abstract class Connection {
-
-	protected static final Logger LOG = getLogger(Connection.class.getName());
-
-	final KeyManager keyManager;
-	final ConnectionRegistry connectionRegistry;
-	final StreamReaderFactory streamReaderFactory;
-	final StreamWriterFactory streamWriterFactory;
-
-	Connection(KeyManager keyManager, ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory) {
-		this.keyManager = keyManager;
-		this.connectionRegistry = connectionRegistry;
-		this.streamReaderFactory = streamReaderFactory;
-		this.streamWriterFactory = streamWriterFactory;
-	}
-
-	@Nullable
-	StreamContext recogniseTag(TransportConnectionReader reader,
-			TransportId transportId) {
-		StreamContext ctx;
-		try {
-			byte[] tag = readTag(reader.getInputStream());
-			return keyManager.getStreamContext(transportId, tag);
-		} catch (IOException | DbException e) {
-			logException(LOG, WARNING, e);
-			return null;
-		}
-	}
-
-	private byte[] readTag(InputStream in) throws IOException {
-		byte[] tag = new byte[TAG_LENGTH];
-		read(in, tag);
-		return tag;
-	}
-
-	void disposeOnError(TransportConnectionReader reader, boolean recognised) {
-		try {
-			reader.dispose(true, recognised);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-		}
-	}
-
-	void disposeOnError(TransportConnectionWriter writer) {
-		try {
-			writer.dispose(true);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-		}
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/ConnectionManagerImpl.java

@@ -1,114 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionManager;
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactExchangeManager;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.contact.HandshakeManager;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
-import org.briarproject.bramble.api.sync.SyncSessionFactory;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.security.SecureRandom;
-import java.util.concurrent.Executor;
-
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-
-@Immutable
-@NotNullByDefault
-class ConnectionManagerImpl implements ConnectionManager {
-
-	private final Executor ioExecutor;
-	private final KeyManager keyManager;
-	private final StreamReaderFactory streamReaderFactory;
-	private final StreamWriterFactory streamWriterFactory;
-	private final SyncSessionFactory syncSessionFactory;
-	private final HandshakeManager handshakeManager;
-	private final ContactExchangeManager contactExchangeManager;
-	private final ConnectionRegistry connectionRegistry;
-	private final TransportPropertyManager transportPropertyManager;
-	private final SecureRandom secureRandom;
-
-	@Inject
-	ConnectionManagerImpl(@IoExecutor Executor ioExecutor,
-			KeyManager keyManager, StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			SyncSessionFactory syncSessionFactory,
-			HandshakeManager handshakeManager,
-			ContactExchangeManager contactExchangeManager,
-			ConnectionRegistry connectionRegistry,
-			TransportPropertyManager transportPropertyManager,
-			SecureRandom secureRandom) {
-		this.ioExecutor = ioExecutor;
-		this.keyManager = keyManager;
-		this.streamReaderFactory = streamReaderFactory;
-		this.streamWriterFactory = streamWriterFactory;
-		this.syncSessionFactory = syncSessionFactory;
-		this.handshakeManager = handshakeManager;
-		this.contactExchangeManager = contactExchangeManager;
-		this.connectionRegistry = connectionRegistry;
-		this.transportPropertyManager = transportPropertyManager;
-		this.secureRandom = secureRandom;
-	}
-
-
-	@Override
-	public void manageIncomingConnection(TransportId t,
-			TransportConnectionReader r) {
-		ioExecutor.execute(new IncomingSimplexSyncConnection(keyManager,
-				connectionRegistry, streamReaderFactory, streamWriterFactory,
-				syncSessionFactory, transportPropertyManager, t, r));
-	}
-
-	@Override
-	public void manageIncomingConnection(TransportId t,
-			DuplexTransportConnection d) {
-		ioExecutor.execute(new IncomingDuplexSyncConnection(keyManager,
-				connectionRegistry, streamReaderFactory, streamWriterFactory,
-				syncSessionFactory, transportPropertyManager, ioExecutor,
-				t, d));
-	}
-
-	@Override
-	public void manageIncomingConnection(PendingContactId p, TransportId t,
-			DuplexTransportConnection d) {
-		ioExecutor.execute(new IncomingHandshakeConnection(keyManager,
-				connectionRegistry, streamReaderFactory, streamWriterFactory,
-				handshakeManager, contactExchangeManager, this, p, t, d));
-	}
-
-	@Override
-	public void manageOutgoingConnection(ContactId c, TransportId t,
-			TransportConnectionWriter w) {
-		ioExecutor.execute(new OutgoingSimplexSyncConnection(keyManager,
-				connectionRegistry, streamReaderFactory, streamWriterFactory,
-				syncSessionFactory, transportPropertyManager, c, t, w));
-	}
-
-	@Override
-	public void manageOutgoingConnection(ContactId c, TransportId t,
-			DuplexTransportConnection d) {
-		ioExecutor.execute(new OutgoingDuplexSyncConnection(keyManager,
-				connectionRegistry, streamReaderFactory, streamWriterFactory,
-				syncSessionFactory, transportPropertyManager, ioExecutor,
-				secureRandom, c, t, d));
-	}
-
-	@Override
-	public void manageOutgoingConnection(PendingContactId p, TransportId t,
-			DuplexTransportConnection d) {
-		ioExecutor.execute(new OutgoingHandshakeConnection(keyManager,
-				connectionRegistry, streamReaderFactory, streamWriterFactory,
-				handshakeManager, contactExchangeManager, this, p, t, d));
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/ConnectionModule.java

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionManager;
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-
-import javax.inject.Singleton;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class ConnectionModule {
-
-	@Provides
-	ConnectionManager provideConnectionManager(
-			ConnectionManagerImpl connectionManager) {
-		return connectionManager;
-	}
-
-	@Provides
-	@Singleton
-	ConnectionRegistry provideConnectionRegistry(
-			ConnectionRegistryImpl connectionRegistry) {
-		return connectionRegistry;
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/ConnectionRegistryImpl.java

@@ -1,283 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.connection.InterruptibleConnection;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginConfig;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
-import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
-import org.briarproject.bramble.api.plugin.event.ContactConnectedEvent;
-import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
-import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
-import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
-import org.briarproject.bramble.api.sync.Priority;
-
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import java.util.Set;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
-import javax.annotation.concurrent.ThreadSafe;
-import javax.inject.Inject;
-
-import static java.util.Collections.emptyList;
-import static java.util.logging.Level.INFO;
-import static java.util.logging.Logger.getLogger;
-
-@ThreadSafe
-@NotNullByDefault
-class ConnectionRegistryImpl implements ConnectionRegistry {
-
-	private static final Logger LOG =
-			getLogger(ConnectionRegistryImpl.class.getName());
-
-	private final EventBus eventBus;
-	private final Map<TransportId, List<TransportId>> transportPrefs;
-
-	private final Object lock = new Object();
-	@GuardedBy("lock")
-	private final Map<ContactId, List<ConnectionRecord>> contactConnections;
-	@GuardedBy("lock")
-	private final Set<PendingContactId> connectedPendingContacts;
-
-	@Inject
-	ConnectionRegistryImpl(EventBus eventBus, PluginConfig pluginConfig) {
-		this.eventBus = eventBus;
-		transportPrefs = pluginConfig.getTransportPreferences();
-		contactConnections = new HashMap<>();
-		connectedPendingContacts = new HashSet<>();
-	}
-
-	@Override
-	public void registerIncomingConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn) {
-		registerConnection(c, t, conn, true);
-	}
-
-	@Override
-	public void registerOutgoingConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, Priority priority) {
-		registerConnection(c, t, conn, false);
-		setPriority(c, t, conn, priority);
-	}
-
-	private void registerConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, boolean incoming) {
-		if (LOG.isLoggable(INFO)) {
-			if (incoming) LOG.info("Incoming connection registered: " + t);
-			else LOG.info("Outgoing connection registered: " + t);
-		}
-		boolean firstConnection;
-		synchronized (lock) {
-			List<ConnectionRecord> recs = contactConnections.get(c);
-			if (recs == null) {
-				recs = new ArrayList<>();
-				contactConnections.put(c, recs);
-			}
-			firstConnection = recs.isEmpty();
-			recs.add(new ConnectionRecord(t, conn));
-		}
-		eventBus.broadcast(new ConnectionOpenedEvent(c, t, incoming));
-		if (firstConnection) {
-			LOG.info("Contact connected");
-			eventBus.broadcast(new ContactConnectedEvent(c));
-		}
-	}
-
-	@Override
-	public void setPriority(ContactId c, TransportId t,
-			InterruptibleConnection conn, Priority priority) {
-		if (LOG.isLoggable(INFO)) LOG.info("Setting connection priority: " + t);
-		List<InterruptibleConnection> toInterrupt;
-		boolean interruptNewConnection = false;
-		synchronized (lock) {
-			List<ConnectionRecord> recs = contactConnections.get(c);
-			if (recs == null) throw new IllegalArgumentException();
-			toInterrupt = new ArrayList<>(recs.size());
-			for (ConnectionRecord rec : recs) {
-				if (rec.conn == conn) {
-					// Store the priority of this connection
-					rec.priority = priority;
-				} else if (rec.priority != null) {
-					int compare = compareConnections(t, priority,
-							rec.transportId, rec.priority);
-					if (compare == -1) {
-						// The old connection is better than the new one
-						interruptNewConnection = true;
-					} else if (compare == 1 && !rec.interrupted) {
-						// The new connection is better than the old one
-						toInterrupt.add(rec.conn);
-						rec.interrupted = true;
-					}
-				}
-			}
-		}
-		if (interruptNewConnection) {
-			LOG.info("Interrupting new connection");
-			conn.interruptOutgoingSession();
-		}
-		for (InterruptibleConnection old : toInterrupt) {
-			LOG.info("Interrupting old connection");
-			old.interruptOutgoingSession();
-		}
-	}
-
-	private int compareConnections(TransportId tA, Priority pA, TransportId tB,
-			Priority pB) {
-		if (getBetterTransports(tA).contains(tB)) return -1;
-		if (getBetterTransports(tB).contains(tA)) return 1;
-		return tA.equals(tB) ? Bytes.compare(pA.getNonce(), pB.getNonce()) : 0;
-	}
-
-	private List<TransportId> getBetterTransports(TransportId t) {
-		List<TransportId> better = transportPrefs.get(t);
-		return better == null ? emptyList() : better;
-	}
-
-	@Override
-	public void unregisterConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, boolean incoming, boolean exception) {
-		if (LOG.isLoggable(INFO)) {
-			if (incoming) LOG.info("Incoming connection unregistered: " + t);
-			else LOG.info("Outgoing connection unregistered: " + t);
-		}
-		boolean lastConnection;
-		synchronized (lock) {
-			List<ConnectionRecord> recs = contactConnections.get(c);
-			if (recs == null || !recs.remove(new ConnectionRecord(t, conn)))
-				throw new IllegalArgumentException();
-			lastConnection = recs.isEmpty();
-		}
-		eventBus.broadcast(
-				new ConnectionClosedEvent(c, t, incoming, exception));
-		if (lastConnection) {
-			LOG.info("Contact disconnected");
-			eventBus.broadcast(new ContactDisconnectedEvent(c));
-		}
-	}
-
-	@Override
-	public Collection<ContactId> getConnectedContacts(TransportId t) {
-		synchronized (lock) {
-			List<ContactId> contactIds = new ArrayList<>();
-			for (Entry<ContactId, List<ConnectionRecord>> e :
-					contactConnections.entrySet()) {
-				for (ConnectionRecord rec : e.getValue()) {
-					if (rec.transportId.equals(t)) {
-						contactIds.add(e.getKey());
-						break;
-					}
-				}
-			}
-			if (LOG.isLoggable(INFO)) {
-				LOG.info(contactIds.size() + " contacts connected: " + t);
-			}
-			return contactIds;
-		}
-	}
-
-	@Override
-	public Collection<ContactId> getConnectedOrBetterContacts(TransportId t) {
-		synchronized (lock) {
-			List<TransportId> better = getBetterTransports(t);
-			List<ContactId> contactIds = new ArrayList<>();
-			for (Entry<ContactId, List<ConnectionRecord>> e :
-					contactConnections.entrySet()) {
-				for (ConnectionRecord rec : e.getValue()) {
-					if (rec.transportId.equals(t) ||
-							better.contains(rec.transportId)) {
-						contactIds.add(e.getKey());
-						break;
-					}
-				}
-			}
-			if (LOG.isLoggable(INFO)) {
-				LOG.info(contactIds.size()
-						+ " contacts connected or better: " + t);
-			}
-			return contactIds;
-		}
-	}
-
-	@Override
-	public boolean isConnected(ContactId c, TransportId t) {
-		synchronized (lock) {
-			List<ConnectionRecord> recs = contactConnections.get(c);
-			if (recs == null) return false;
-			for (ConnectionRecord rec : recs) {
-				if (rec.transportId.equals(t)) return true;
-			}
-			return false;
-		}
-	}
-
-	@Override
-	public boolean isConnected(ContactId c) {
-		synchronized (lock) {
-			List<ConnectionRecord> recs = contactConnections.get(c);
-			return recs != null && !recs.isEmpty();
-		}
-	}
-
-	@Override
-	public boolean registerConnection(PendingContactId p) {
-		boolean added;
-		synchronized (lock) {
-			added = connectedPendingContacts.add(p);
-		}
-		if (added) eventBus.broadcast(new RendezvousConnectionOpenedEvent(p));
-		return added;
-	}
-
-	@Override
-	public void unregisterConnection(PendingContactId p, boolean success) {
-		synchronized (lock) {
-			if (!connectedPendingContacts.remove(p))
-				throw new IllegalArgumentException();
-		}
-		eventBus.broadcast(new RendezvousConnectionClosedEvent(p, success));
-	}
-
-	private static class ConnectionRecord {
-
-		private final TransportId transportId;
-		private final InterruptibleConnection conn;
-		@GuardedBy("lock")
-		@Nullable
-		private Priority priority = null;
-		@GuardedBy("lock")
-		private boolean interrupted = false;
-
-		private ConnectionRecord(TransportId transportId,
-				InterruptibleConnection conn) {
-			this.transportId = transportId;
-			this.conn = conn;
-		}
-
-		@Override
-		public boolean equals(Object o) {
-			if (o instanceof ConnectionRecord) {
-				return conn == ((ConnectionRecord) o).conn;
-			} else {
-				return false;
-			}
-		}
-
-		@Override
-		public int hashCode() {
-			return conn.hashCode();
-		}
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/DuplexSyncConnection.java

@@ -1,109 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.connection.InterruptibleConnection;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.properties.TransportProperties;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
-import org.briarproject.bramble.api.sync.Priority;
-import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.SyncSessionFactory;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriter;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-import java.util.concurrent.Executor;
-
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
-
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-
-@NotNullByDefault
-abstract class DuplexSyncConnection extends SyncConnection
-		implements InterruptibleConnection {
-
-	final Executor ioExecutor;
-	final TransportId transportId;
-	final TransportConnectionReader reader;
-	final TransportConnectionWriter writer;
-	final TransportProperties remote;
-
-	private final Object interruptLock = new Object();
-
-	@GuardedBy("interruptLock")
-	@Nullable
-	private SyncSession outgoingSession = null;
-	@GuardedBy("interruptLock")
-	private boolean interruptWaiting = false;
-
-	@Override
-	public void interruptOutgoingSession() {
-		SyncSession out = null;
-		synchronized (interruptLock) {
-			if (outgoingSession == null) interruptWaiting = true;
-			else out = outgoingSession;
-		}
-		if (out != null) out.interrupt();
-	}
-
-	void setOutgoingSession(SyncSession outgoingSession) {
-		boolean interruptWasWaiting = false;
-		synchronized (interruptLock) {
-			this.outgoingSession = outgoingSession;
-			if (interruptWaiting) {
-				interruptWasWaiting = true;
-				interruptWaiting = false;
-			}
-		}
-		if (interruptWasWaiting) outgoingSession.interrupt();
-	}
-
-	DuplexSyncConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			SyncSessionFactory syncSessionFactory,
-			TransportPropertyManager transportPropertyManager,
-			Executor ioExecutor, TransportId transportId,
-			DuplexTransportConnection connection) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory, syncSessionFactory,
-				transportPropertyManager);
-		this.ioExecutor = ioExecutor;
-		this.transportId = transportId;
-		reader = connection.getReader();
-		writer = connection.getWriter();
-		remote = connection.getRemoteProperties();
-	}
-
-	void onReadError(boolean recognised) {
-		disposeOnError(reader, recognised);
-		disposeOnError(writer);
-		interruptOutgoingSession();
-	}
-
-	void onWriteError() {
-		disposeOnError(reader, true);
-		disposeOnError(writer);
-	}
-
-	SyncSession createDuplexOutgoingSession(StreamContext ctx,
-			TransportConnectionWriter w, @Nullable Priority priority)
-			throws IOException {
-		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
-				w.getOutputStream(), ctx);
-		ContactId c = requireNonNull(ctx.getContactId());
-		return syncSessionFactory.createDuplexOutgoingSession(c,
-				ctx.getTransportId(), w.getMaxLatency(), w.getMaxIdleTime(),
-				streamWriter, priority);
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/HandshakeConnection.java

@@ -1,72 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionManager;
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactExchangeManager;
-import org.briarproject.bramble.api.contact.HandshakeManager;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import javax.annotation.Nullable;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-abstract class HandshakeConnection extends Connection {
-
-	final HandshakeManager handshakeManager;
-	final ContactExchangeManager contactExchangeManager;
-	final ConnectionManager connectionManager;
-	final PendingContactId pendingContactId;
-	final TransportId transportId;
-	final DuplexTransportConnection connection;
-	final TransportConnectionReader reader;
-	final TransportConnectionWriter writer;
-
-	HandshakeConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			HandshakeManager handshakeManager,
-			ContactExchangeManager contactExchangeManager,
-			ConnectionManager connectionManager,
-			PendingContactId pendingContactId,
-			TransportId transportId, DuplexTransportConnection connection) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory);
-		this.handshakeManager = handshakeManager;
-		this.contactExchangeManager = contactExchangeManager;
-		this.connectionManager = connectionManager;
-		this.pendingContactId = pendingContactId;
-		this.transportId = transportId;
-		this.connection = connection;
-		reader = connection.getReader();
-		writer = connection.getWriter();
-	}
-
-	@Nullable
-	StreamContext allocateStreamContext(PendingContactId pendingContactId,
-			TransportId transportId) {
-		try {
-			return keyManager.getStreamContext(pendingContactId, transportId);
-		} catch (DbException e) {
-			logException(LOG, WARNING, e);
-			return null;
-		}
-	}
-
-	void onError(boolean recognised) {
-		disposeOnError(reader, recognised);
-		disposeOnError(writer);
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/IncomingDuplexSyncConnection.java

@@ -1,107 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
-import org.briarproject.bramble.api.sync.PriorityHandler;
-import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.SyncSessionFactory;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-import java.util.concurrent.Executor;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-class IncomingDuplexSyncConnection extends DuplexSyncConnection
-		implements Runnable {
-
-	IncomingDuplexSyncConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			SyncSessionFactory syncSessionFactory,
-			TransportPropertyManager transportPropertyManager,
-			Executor ioExecutor, TransportId transportId,
-			DuplexTransportConnection connection) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory, syncSessionFactory,
-				transportPropertyManager, ioExecutor, transportId, connection);
-	}
-
-	@Override
-	public void run() {
-		// Read and recognise the tag
-		StreamContext ctx = recogniseTag(reader, transportId);
-		if (ctx == null) {
-			LOG.info("Unrecognised tag");
-			onReadError(false);
-			return;
-		}
-		ContactId contactId = ctx.getContactId();
-		if (contactId == null) {
-			LOG.warning("Expected contact tag, got rendezvous tag");
-			onReadError(true);
-			return;
-		}
-		if (ctx.isHandshakeMode()) {
-			// TODO: Support handshake mode for contacts
-			LOG.warning("Received handshake tag, expected rotation mode");
-			onReadError(true);
-			return;
-		}
-		connectionRegistry.registerIncomingConnection(contactId, transportId,
-				this);
-		// Start the outgoing session on another thread
-		ioExecutor.execute(() -> runOutgoingSession(contactId));
-		try {
-			// Store any transport properties discovered from the connection
-			transportPropertyManager.addRemotePropertiesFromConnection(
-					contactId, transportId, remote);
-			// Update the connection registry when we receive our priority
-			PriorityHandler handler = p -> connectionRegistry.setPriority(
-					contactId, transportId, this, p);
-			// Create and run the incoming session
-			createIncomingSession(ctx, reader, handler).run();
-			reader.dispose(false, true);
-			interruptOutgoingSession();
-			connectionRegistry.unregisterConnection(contactId, transportId,
-					this, true, false);
-		} catch (DbException | IOException e) {
-			logException(LOG, WARNING, e);
-			onReadError(true);
-			connectionRegistry.unregisterConnection(contactId, transportId,
-					this, true, true);
-		}
-	}
-
-	private void runOutgoingSession(ContactId contactId) {
-		// Allocate a stream context
-		StreamContext ctx = allocateStreamContext(contactId, transportId);
-		if (ctx == null) {
-			LOG.warning("Could not allocate stream context");
-			onWriteError();
-			return;
-		}
-		try {
-			// Create and run the outgoing session
-			SyncSession out = createDuplexOutgoingSession(ctx, writer, null);
-			setOutgoingSession(out);
-			out.run();
-			writer.dispose(false);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-			onWriteError();
-		}
-	}
-}
-

bramble-core/src/main/java/org/briarproject/bramble/connection/IncomingHandshakeConnection.java

@@ -1,93 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionManager;
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactExchangeManager;
-import org.briarproject.bramble.api.contact.HandshakeManager;
-import org.briarproject.bramble.api.contact.HandshakeManager.HandshakeResult;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriter;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-class IncomingHandshakeConnection extends HandshakeConnection
-		implements Runnable {
-
-	IncomingHandshakeConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			HandshakeManager handshakeManager,
-			ContactExchangeManager contactExchangeManager,
-			ConnectionManager connectionManager,
-			PendingContactId pendingContactId,
-			TransportId transportId, DuplexTransportConnection connection) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory, handshakeManager, contactExchangeManager,
-				connectionManager, pendingContactId, transportId, connection);
-	}
-
-	@Override
-	public void run() {
-		// Read and recognise the tag
-		StreamContext ctxIn = recogniseTag(reader, transportId);
-		if (ctxIn == null) {
-			LOG.info("Unrecognised tag");
-			onError(false);
-			return;
-		}
-		PendingContactId inPendingContactId = ctxIn.getPendingContactId();
-		if (inPendingContactId == null) {
-			LOG.warning("Expected rendezvous tag, got contact tag");
-			onError(true);
-			return;
-		}
-		// Allocate the outgoing stream context
-		StreamContext ctxOut =
-				allocateStreamContext(pendingContactId, transportId);
-		if (ctxOut == null) {
-			LOG.warning("Could not allocate stream context");
-			onError(true);
-			return;
-		}
-		// Close the connection if it's redundant
-		if (!connectionRegistry.registerConnection(pendingContactId)) {
-			LOG.info("Redundant rendezvous connection");
-			onError(true);
-			return;
-		}
-		// Handshake and exchange contacts
-		try {
-			InputStream in = streamReaderFactory.createStreamReader(
-					reader.getInputStream(), ctxIn);
-			// Flush the output stream to send the outgoing stream header
-			StreamWriter out = streamWriterFactory.createStreamWriter(
-					writer.getOutputStream(), ctxOut);
-			out.getOutputStream().flush();
-			HandshakeResult result =
-					handshakeManager.handshake(pendingContactId, in, out);
-			contactExchangeManager.exchangeContacts(pendingContactId,
-					connection, result.getMasterKey(), result.isAlice(), false);
-			connectionRegistry.unregisterConnection(pendingContactId, true);
-			// Reuse the connection as a transport connection
-			connectionManager.manageIncomingConnection(transportId, connection);
-		} catch (IOException | DbException e) {
-			logException(LOG, WARNING, e);
-			onError(true);
-			connectionRegistry.unregisterConnection(pendingContactId, false);
-		}
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/IncomingSimplexSyncConnection.java

@@ -1,79 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
-import org.briarproject.bramble.api.sync.PriorityHandler;
-import org.briarproject.bramble.api.sync.SyncSessionFactory;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-class IncomingSimplexSyncConnection extends SyncConnection implements Runnable {
-
-	private final TransportId transportId;
-	private final TransportConnectionReader reader;
-
-	IncomingSimplexSyncConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			SyncSessionFactory syncSessionFactory,
-			TransportPropertyManager transportPropertyManager,
-			TransportId transportId, TransportConnectionReader reader) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory, syncSessionFactory,
-				transportPropertyManager);
-		this.transportId = transportId;
-		this.reader = reader;
-	}
-
-	@Override
-	public void run() {
-		// Read and recognise the tag
-		StreamContext ctx = recogniseTag(reader, transportId);
-		if (ctx == null) {
-			LOG.info("Unrecognised tag");
-			onError(false);
-			return;
-		}
-		ContactId contactId = ctx.getContactId();
-		if (contactId == null) {
-			LOG.warning("Received rendezvous stream, expected contact");
-			onError(true);
-			return;
-		}
-		if (ctx.isHandshakeMode()) {
-			// TODO: Support handshake mode for contacts
-			LOG.warning("Received handshake tag, expected rotation mode");
-			onError(true);
-			return;
-		}
-		try {
-			// We don't expect to receive a priority for this connection
-			PriorityHandler handler = p ->
-					LOG.info("Ignoring priority for simplex connection");
-			// Create and run the incoming session
-			createIncomingSession(ctx, reader, handler).run();
-			reader.dispose(false, true);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-			onError(true);
-		}
-	}
-
-	private void onError(boolean recognised) {
-		disposeOnError(reader, recognised);
-	}
-}
-

bramble-core/src/main/java/org/briarproject/bramble/connection/OutgoingDuplexSyncConnection.java

@@ -1,140 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
-import org.briarproject.bramble.api.sync.Priority;
-import org.briarproject.bramble.api.sync.PriorityHandler;
-import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.SyncSessionFactory;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-import java.security.SecureRandom;
-import java.util.concurrent.Executor;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.api.sync.SyncConstants.PRIORITY_NONCE_BYTES;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-class OutgoingDuplexSyncConnection extends DuplexSyncConnection
-		implements Runnable {
-
-	private final SecureRandom secureRandom;
-	private final ContactId contactId;
-
-	OutgoingDuplexSyncConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			SyncSessionFactory syncSessionFactory,
-			TransportPropertyManager transportPropertyManager,
-			Executor ioExecutor, SecureRandom secureRandom, ContactId contactId,
-			TransportId transportId, DuplexTransportConnection connection) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory, syncSessionFactory,
-				transportPropertyManager, ioExecutor, transportId, connection);
-		this.secureRandom = secureRandom;
-		this.contactId = contactId;
-	}
-
-	@Override
-	public void run() {
-		// Allocate a stream context
-		StreamContext ctx = allocateStreamContext(contactId, transportId);
-		if (ctx == null) {
-			LOG.warning("Could not allocate stream context");
-			onWriteError();
-			return;
-		}
-		if (ctx.isHandshakeMode()) {
-			// TODO: Support handshake mode for contacts
-			LOG.warning("Cannot use handshake mode stream context");
-			onWriteError();
-			return;
-		}
-		// Start the incoming session on another thread
-		Priority priority = generatePriority();
-		ioExecutor.execute(() -> runIncomingSession(priority));
-		try {
-			// Create and run the outgoing session
-			SyncSession out =
-					createDuplexOutgoingSession(ctx, writer, priority);
-			setOutgoingSession(out);
-			out.run();
-			writer.dispose(false);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-			onWriteError();
-		}
-	}
-
-	private void runIncomingSession(Priority priority) {
-		// Read and recognise the tag
-		StreamContext ctx = recogniseTag(reader, transportId);
-		// Unrecognised tags are suspicious in this case
-		if (ctx == null) {
-			LOG.warning("Unrecognised tag for returning stream");
-			onReadError();
-			return;
-		}
-		// Check that the stream comes from the expected contact
-		ContactId inContactId = ctx.getContactId();
-		if (inContactId == null) {
-			LOG.warning("Expected contact tag, got rendezvous tag");
-			onReadError();
-			return;
-		}
-		if (!contactId.equals(inContactId)) {
-			LOG.warning("Wrong contact ID for returning stream");
-			onReadError();
-			return;
-		}
-		if (ctx.isHandshakeMode()) {
-			// TODO: Support handshake mode for contacts
-			LOG.warning("Received handshake tag, expected rotation mode");
-			onReadError();
-			return;
-		}
-		connectionRegistry.registerOutgoingConnection(contactId, transportId,
-				this, priority);
-		try {
-			// Store any transport properties discovered from the connection
-			transportPropertyManager.addRemotePropertiesFromConnection(
-					contactId, transportId, remote);
-			// We don't expect to receive a priority for this connection
-			PriorityHandler handler = p ->
-					LOG.info("Ignoring priority for outgoing connection");
-			// Create and run the incoming session
-			createIncomingSession(ctx, reader, handler).run();
-			reader.dispose(false, true);
-			interruptOutgoingSession();
-			connectionRegistry.unregisterConnection(contactId, transportId,
-					this, false, false);
-		} catch (DbException | IOException e) {
-			logException(LOG, WARNING, e);
-			onReadError();
-			connectionRegistry.unregisterConnection(contactId, transportId,
-					this, false, true);
-		}
-	}
-
-	private void onReadError() {
-		// 'Recognised' is always true for outgoing connections
-		onReadError(true);
-	}
-
-	private Priority generatePriority() {
-		byte[] nonce = new byte[PRIORITY_NONCE_BYTES];
-		secureRandom.nextBytes(nonce);
-		return new Priority(nonce);
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/OutgoingHandshakeConnection.java

@@ -1,115 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionManager;
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.Contact;
-import org.briarproject.bramble.api.contact.ContactExchangeManager;
-import org.briarproject.bramble.api.contact.HandshakeManager;
-import org.briarproject.bramble.api.contact.HandshakeManager.HandshakeResult;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriter;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-class OutgoingHandshakeConnection extends HandshakeConnection
-		implements Runnable {
-
-	OutgoingHandshakeConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			HandshakeManager handshakeManager,
-			ContactExchangeManager contactExchangeManager,
-			ConnectionManager connectionManager,
-			PendingContactId pendingContactId,
-			TransportId transportId, DuplexTransportConnection connection) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory, handshakeManager, contactExchangeManager,
-				connectionManager, pendingContactId, transportId, connection);
-	}
-
-	@Override
-	public void run() {
-		// Allocate the outgoing stream context
-		StreamContext ctxOut =
-				allocateStreamContext(pendingContactId, transportId);
-		if (ctxOut == null) {
-			LOG.warning("Could not allocate stream context");
-			onError();
-			return;
-		}
-		// Flush the output stream to send the outgoing stream header
-		StreamWriter out;
-		try {
-			out = streamWriterFactory.createStreamWriter(
-					writer.getOutputStream(), ctxOut);
-			out.getOutputStream().flush();
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-			onError();
-			return;
-		}
-		// Read and recognise the tag
-		StreamContext ctxIn = recogniseTag(reader, transportId);
-		// Unrecognised tags are suspicious in this case
-		if (ctxIn == null) {
-			LOG.warning("Unrecognised tag for returning stream");
-			onError();
-			return;
-		}
-		// Check that the stream comes from the expected pending contact
-		PendingContactId inPendingContactId = ctxIn.getPendingContactId();
-		if (inPendingContactId == null) {
-			LOG.warning("Expected rendezvous tag, got contact tag");
-			onError();
-			return;
-		}
-		if (!inPendingContactId.equals(pendingContactId)) {
-			LOG.warning("Wrong pending contact ID for returning stream");
-			onError();
-			return;
-		}
-		// Close the connection if it's redundant
-		if (!connectionRegistry.registerConnection(pendingContactId)) {
-			LOG.info("Redundant rendezvous connection");
-			onError();
-			return;
-		}
-		// Handshake and exchange contacts
-		try {
-			InputStream in = streamReaderFactory.createStreamReader(
-					reader.getInputStream(), ctxIn);
-			HandshakeResult result =
-					handshakeManager.handshake(pendingContactId, in, out);
-			Contact contact = contactExchangeManager.exchangeContacts(
-					pendingContactId, connection, result.getMasterKey(),
-					result.isAlice(), false);
-			connectionRegistry.unregisterConnection(pendingContactId, true);
-			// Reuse the connection as a transport connection
-			connectionManager.manageOutgoingConnection(contact.getId(),
-					transportId, connection);
-		} catch (IOException | DbException e) {
-			logException(LOG, WARNING, e);
-			onError();
-			connectionRegistry.unregisterConnection(pendingContactId, false);
-		}
-	}
-
-	private void onError() {
-		// 'Recognised' is always true for outgoing connections
-		onError(true);
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/connection/OutgoingSimplexSyncConnection.java

@@ -1,78 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
-import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.SyncSessionFactory;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriter;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-class OutgoingSimplexSyncConnection extends SyncConnection implements Runnable {
-
-	private final ContactId contactId;
-	private final TransportId transportId;
-	private final TransportConnectionWriter writer;
-
-	OutgoingSimplexSyncConnection(KeyManager keyManager,
-			ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			SyncSessionFactory syncSessionFactory,
-			TransportPropertyManager transportPropertyManager,
-			ContactId contactId, TransportId transportId,
-			TransportConnectionWriter writer) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory, syncSessionFactory,
-				transportPropertyManager);
-		this.contactId = contactId;
-		this.transportId = transportId;
-		this.writer = writer;
-	}
-
-	@Override
-	public void run() {
-		// Allocate a stream context
-		StreamContext ctx = allocateStreamContext(contactId, transportId);
-		if (ctx == null) {
-			LOG.warning("Could not allocate stream context");
-			onError();
-			return;
-		}
-		try {
-			// Create and run the outgoing session
-			createSimplexOutgoingSession(ctx, writer).run();
-			writer.dispose(false);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
-			onError();
-		}
-	}
-
-	private void onError() {
-		disposeOnError(writer);
-	}
-
-	private SyncSession createSimplexOutgoingSession(StreamContext ctx,
-			TransportConnectionWriter w) throws IOException {
-		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
-				w.getOutputStream(), ctx);
-		ContactId c = requireNonNull(ctx.getContactId());
-		return syncSessionFactory.createSimplexOutgoingSession(c,
-				ctx.getTransportId(), w.getMaxLatency(), streamWriter);
-	}
-}
-

bramble-core/src/main/java/org/briarproject/bramble/connection/SyncConnection.java

@@ -1,64 +0,0 @@
-package org.briarproject.bramble.connection;
-
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.properties.TransportPropertyManager;
-import org.briarproject.bramble.api.sync.PriorityHandler;
-import org.briarproject.bramble.api.sync.SyncSession;
-import org.briarproject.bramble.api.sync.SyncSessionFactory;
-import org.briarproject.bramble.api.transport.KeyManager;
-import org.briarproject.bramble.api.transport.StreamContext;
-import org.briarproject.bramble.api.transport.StreamReaderFactory;
-import org.briarproject.bramble.api.transport.StreamWriterFactory;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-import javax.annotation.Nullable;
-
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-@NotNullByDefault
-class SyncConnection extends Connection {
-
-	final SyncSessionFactory syncSessionFactory;
-	final TransportPropertyManager transportPropertyManager;
-
-	SyncConnection(KeyManager keyManager, ConnectionRegistry connectionRegistry,
-			StreamReaderFactory streamReaderFactory,
-			StreamWriterFactory streamWriterFactory,
-			SyncSessionFactory syncSessionFactory,
-			TransportPropertyManager transportPropertyManager) {
-		super(keyManager, connectionRegistry, streamReaderFactory,
-				streamWriterFactory);
-		this.syncSessionFactory = syncSessionFactory;
-		this.transportPropertyManager = transportPropertyManager;
-	}
-
-	@Nullable
-	StreamContext allocateStreamContext(ContactId contactId,
-			TransportId transportId) {
-		try {
-			return keyManager.getStreamContext(contactId, transportId);
-		} catch (DbException e) {
-			logException(LOG, WARNING, e);
-			return null;
-		}
-	}
-
-	SyncSession createIncomingSession(StreamContext ctx,
-			TransportConnectionReader r, PriorityHandler handler)
-			throws IOException {
-		InputStream streamReader = streamReaderFactory.createStreamReader(
-				r.getInputStream(), ctx);
-		ContactId c = requireNonNull(ctx.getContactId());
-		return syncSessionFactory
-				.createIncomingSession(c, streamReader, handler);
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/io/IoModule.java

@@ -1,18 +0,0 @@
-package org.briarproject.bramble.io;
-
-import org.briarproject.bramble.api.io.TimeoutMonitor;
-
-import javax.inject.Singleton;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class IoModule {
-
-	@Provides
-	@Singleton
-	TimeoutMonitor provideTimeoutMonitor(TimeoutMonitorImpl timeoutMonitor) {
-		return timeoutMonitor;
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/io/TimeoutInputStream.java

@@ -1,104 +0,0 @@
-package org.briarproject.bramble.io;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.Clock;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-import javax.annotation.concurrent.GuardedBy;
-
-@NotNullByDefault
-class TimeoutInputStream extends InputStream {
-
-	private final Clock clock;
-	private final InputStream in;
-	private final long timeoutMs;
-	private final CloseListener listener;
-	private final Object lock = new Object();
-	@GuardedBy("lock")
-	private long readStartedMs = -1;
-
-	TimeoutInputStream(Clock clock, InputStream in, long timeoutMs,
-			CloseListener listener) {
-		this.clock = clock;
-		this.in = in;
-		this.timeoutMs = timeoutMs;
-		this.listener = listener;
-	}
-
-	@Override
-	public int read() throws IOException {
-		synchronized (lock) {
-			readStartedMs = clock.currentTimeMillis();
-		}
-		int input = in.read();
-		synchronized (lock) {
-			readStartedMs = -1;
-		}
-		return input;
-	}
-
-	@Override
-	public int read(byte[] b) throws IOException {
-		return read(b, 0, b.length);
-	}
-
-	@Override
-	public int read(byte[] b, int off, int len) throws IOException {
-		synchronized (lock) {
-			readStartedMs = clock.currentTimeMillis();
-		}
-		int read = in.read(b, off, len);
-		synchronized (lock) {
-			readStartedMs = -1;
-		}
-		return read;
-	}
-
-	@Override
-	public void close() throws IOException {
-		try {
-			in.close();
-		} finally {
-			listener.onClose(this);
-		}
-	}
-
-	@Override
-	public int available() throws IOException {
-		return in.available();
-	}
-
-	@Override
-	public void mark(int readlimit) {
-		in.mark(readlimit);
-	}
-
-	@Override
-	public boolean markSupported() {
-		return in.markSupported();
-	}
-
-	@Override
-	public void reset() throws IOException {
-		in.reset();
-	}
-
-	@Override
-	public long skip(long n) throws IOException {
-		return in.skip(n);
-	}
-
-	boolean hasTimedOut() {
-		synchronized (lock) {
-			return readStartedMs != -1 &&
-					clock.currentTimeMillis() - readStartedMs > timeoutMs;
-		}
-	}
-
-	interface CloseListener {
-
-		void onClose(TimeoutInputStream closed);
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/io/TimeoutMonitorImpl.java

@@ -1,99 +0,0 @@
-package org.briarproject.bramble.io;
-
-import org.briarproject.bramble.api.io.TimeoutMonitor;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.system.TaskScheduler;
-import org.briarproject.bramble.api.system.TaskScheduler.Cancellable;
-import org.briarproject.bramble.api.system.Wakeful;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.concurrent.Executor;
-import java.util.logging.Logger;
-
-import javax.annotation.concurrent.GuardedBy;
-import javax.inject.Inject;
-
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static java.util.concurrent.TimeUnit.SECONDS;
-import static java.util.logging.Level.INFO;
-import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.util.LogUtils.logException;
-
-class TimeoutMonitorImpl implements TimeoutMonitor {
-
-	private static final Logger LOG =
-			getLogger(TimeoutMonitorImpl.class.getName());
-
-	private static final long CHECK_INTERVAL_MS = SECONDS.toMillis(10);
-
-	private final TaskScheduler scheduler;
-	private final Executor ioExecutor;
-	private final Clock clock;
-	private final Object lock = new Object();
-	@GuardedBy("lock")
-	private final List<TimeoutInputStream> streams = new ArrayList<>();
-
-	@GuardedBy("lock")
-	private Cancellable cancellable = null;
-
-	@Inject
-	TimeoutMonitorImpl(TaskScheduler scheduler,
-			@IoExecutor Executor ioExecutor, Clock clock) {
-		this.scheduler = scheduler;
-		this.ioExecutor = ioExecutor;
-		this.clock = clock;
-	}
-
-	@Override
-	public InputStream createTimeoutInputStream(InputStream in,
-			long timeoutMs) {
-		TimeoutInputStream stream = new TimeoutInputStream(clock, in,
-				timeoutMs, this::removeStream);
-		synchronized (lock) {
-			if (streams.isEmpty()) {
-				cancellable = scheduler.scheduleWithFixedDelay(
-						this::checkTimeouts, ioExecutor, CHECK_INTERVAL_MS,
-						CHECK_INTERVAL_MS, MILLISECONDS);
-			}
-			streams.add(stream);
-		}
-		return stream;
-	}
-
-	private void removeStream(TimeoutInputStream stream) {
-		Cancellable toCancel = null;
-		synchronized (lock) {
-			if (streams.remove(stream) && streams.isEmpty()) {
-				toCancel = cancellable;
-				cancellable = null;
-			}
-		}
-		if (toCancel != null) {
-			LOG.info("Cancelling timeout monitor task");
-			toCancel.cancel();
-		}
-	}
-
-	@IoExecutor
-	@Wakeful
-	private void checkTimeouts() {
-		List<TimeoutInputStream> snapshot;
-		synchronized (lock) {
-			snapshot = new ArrayList<>(streams);
-		}
-		for (TimeoutInputStream stream : snapshot) {
-			if (stream.hasTimedOut()) {
-				LOG.info("Input stream has timed out");
-				try {
-					stream.close();
-				} catch (IOException e) {
-					logException(LOG, INFO, e);
-				}
-			}
-		}
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/plugin/ConnectionManagerImpl.java

@@ -0,0 +1,709 @@
+package org.briarproject.bramble.plugin;
+
+import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.bramble.api.contact.ContactExchangeManager;
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.HandshakeManager;
+import org.briarproject.bramble.api.contact.HandshakeManager.HandshakeResult;
+import org.briarproject.bramble.api.contact.PendingContactId;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.ConnectionManager;
+import org.briarproject.bramble.api.plugin.ConnectionRegistry;
+import org.briarproject.bramble.api.plugin.TransportConnectionReader;
+import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
+import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.properties.TransportPropertyManager;
+import org.briarproject.bramble.api.sync.SyncSession;
+import org.briarproject.bramble.api.sync.SyncSessionFactory;
+import org.briarproject.bramble.api.transport.KeyManager;
+import org.briarproject.bramble.api.transport.StreamContext;
+import org.briarproject.bramble.api.transport.StreamReaderFactory;
+import org.briarproject.bramble.api.transport.StreamWriter;
+import org.briarproject.bramble.api.transport.StreamWriterFactory;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
+import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
+import static org.briarproject.bramble.util.IoUtils.read;
+import static org.briarproject.bramble.util.LogUtils.logException;
+
+@NotNullByDefault
+class ConnectionManagerImpl implements ConnectionManager {
+
+	private static final Logger LOG =
+			getLogger(ConnectionManagerImpl.class.getName());
+
+	private final Executor ioExecutor;
+	private final KeyManager keyManager;
+	private final StreamReaderFactory streamReaderFactory;
+	private final StreamWriterFactory streamWriterFactory;
+	private final SyncSessionFactory syncSessionFactory;
+	private final HandshakeManager handshakeManager;
+	private final ContactExchangeManager contactExchangeManager;
+	private final ConnectionRegistry connectionRegistry;
+	private final TransportPropertyManager transportPropertyManager;
+
+	@Inject
+	ConnectionManagerImpl(@IoExecutor Executor ioExecutor,
+			KeyManager keyManager, StreamReaderFactory streamReaderFactory,
+			StreamWriterFactory streamWriterFactory,
+			SyncSessionFactory syncSessionFactory,
+			HandshakeManager handshakeManager,
+			ContactExchangeManager contactExchangeManager,
+			ConnectionRegistry connectionRegistry,
+			TransportPropertyManager transportPropertyManager) {
+		this.ioExecutor = ioExecutor;
+		this.keyManager = keyManager;
+		this.streamReaderFactory = streamReaderFactory;
+		this.streamWriterFactory = streamWriterFactory;
+		this.syncSessionFactory = syncSessionFactory;
+		this.handshakeManager = handshakeManager;
+		this.contactExchangeManager = contactExchangeManager;
+		this.connectionRegistry = connectionRegistry;
+		this.transportPropertyManager = transportPropertyManager;
+	}
+
+	@Override
+	public void manageIncomingConnection(TransportId t,
+			TransportConnectionReader r) {
+		ioExecutor.execute(new ManageIncomingSimplexConnection(t, r));
+	}
+
+	@Override
+	public void manageIncomingConnection(TransportId t,
+			DuplexTransportConnection d) {
+		ioExecutor.execute(new ManageIncomingDuplexConnection(t, d));
+	}
+
+	@Override
+	public void manageIncomingConnection(PendingContactId p, TransportId t,
+			DuplexTransportConnection d) {
+		ioExecutor.execute(new ManageIncomingHandshakeConnection(p, t, d));
+	}
+
+	@Override
+	public void manageOutgoingConnection(ContactId c, TransportId t,
+			TransportConnectionWriter w) {
+		ioExecutor.execute(new ManageOutgoingSimplexConnection(c, t, w));
+	}
+
+	@Override
+	public void manageOutgoingConnection(ContactId c, TransportId t,
+			DuplexTransportConnection d) {
+		ioExecutor.execute(new ManageOutgoingDuplexConnection(c, t, d));
+	}
+
+	@Override
+	public void manageOutgoingConnection(PendingContactId p, TransportId t,
+			DuplexTransportConnection d) {
+		ioExecutor.execute(new ManageOutgoingHandshakeConnection(p, t, d));
+	}
+
+	private byte[] readTag(InputStream in) throws IOException {
+		byte[] tag = new byte[TAG_LENGTH];
+		read(in, tag);
+		return tag;
+	}
+
+	private SyncSession createIncomingSession(StreamContext ctx,
+			TransportConnectionReader r) throws IOException {
+		InputStream streamReader = streamReaderFactory.createStreamReader(
+				r.getInputStream(), ctx);
+		ContactId c = requireNonNull(ctx.getContactId());
+		return syncSessionFactory.createIncomingSession(c, streamReader);
+	}
+
+	private SyncSession createSimplexOutgoingSession(StreamContext ctx,
+			TransportConnectionWriter w) throws IOException {
+		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
+				w.getOutputStream(), ctx);
+		ContactId c = requireNonNull(ctx.getContactId());
+		return syncSessionFactory.createSimplexOutgoingSession(c,
+				w.getMaxLatency(), streamWriter);
+	}
+
+	private SyncSession createDuplexOutgoingSession(StreamContext ctx,
+			TransportConnectionWriter w) throws IOException {
+		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
+				w.getOutputStream(), ctx);
+		ContactId c = requireNonNull(ctx.getContactId());
+		return syncSessionFactory.createDuplexOutgoingSession(c,
+				w.getMaxLatency(), w.getMaxIdleTime(), streamWriter);
+	}
+
+	private void disposeOnError(TransportConnectionReader reader,
+			boolean recognised) {
+		try {
+			reader.dispose(true, recognised);
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+
+	private void disposeOnError(TransportConnectionWriter writer) {
+		try {
+			writer.dispose(true);
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+
+	private class ManageIncomingSimplexConnection implements Runnable {
+
+		private final TransportId transportId;
+		private final TransportConnectionReader reader;
+
+		private ManageIncomingSimplexConnection(TransportId transportId,
+				TransportConnectionReader reader) {
+			this.transportId = transportId;
+			this.reader = reader;
+		}
+
+		@Override
+		public void run() {
+			// Read and recognise the tag
+			StreamContext ctx;
+			try {
+				byte[] tag = readTag(reader.getInputStream());
+				ctx = keyManager.getStreamContext(transportId, tag);
+			} catch (IOException | DbException e) {
+				logException(LOG, WARNING, e);
+				onError(false);
+				return;
+			}
+			if (ctx == null) {
+				LOG.info("Unrecognised tag");
+				onError(false);
+				return;
+			}
+			ContactId contactId = ctx.getContactId();
+			if (contactId == null) {
+				LOG.warning("Received rendezvous stream, expected contact");
+				onError(true);
+				return;
+			}
+			if (ctx.isHandshakeMode()) {
+				// TODO: Support handshake mode for contacts
+				LOG.warning("Received handshake tag, expected rotation mode");
+				onError(true);
+				return;
+			}
+			connectionRegistry.registerConnection(contactId, transportId, true);
+			try {
+				// Create and run the incoming session
+				createIncomingSession(ctx, reader).run();
+				reader.dispose(false, true);
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+				onError(true);
+			} finally {
+				connectionRegistry.unregisterConnection(contactId, transportId,
+						true);
+			}
+		}
+
+		private void onError(boolean recognised) {
+			disposeOnError(reader, recognised);
+		}
+	}
+
+	private class ManageOutgoingSimplexConnection implements Runnable {
+
+		private final ContactId contactId;
+		private final TransportId transportId;
+		private final TransportConnectionWriter writer;
+
+		private ManageOutgoingSimplexConnection(ContactId contactId,
+				TransportId transportId, TransportConnectionWriter writer) {
+			this.contactId = contactId;
+			this.transportId = transportId;
+			this.writer = writer;
+		}
+
+		@Override
+		public void run() {
+			// Allocate a stream context
+			StreamContext ctx;
+			try {
+				ctx = keyManager.getStreamContext(contactId, transportId);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+				onError();
+				return;
+			}
+			if (ctx == null) {
+				LOG.warning("Could not allocate stream context");
+				onError();
+				return;
+			}
+			connectionRegistry.registerConnection(contactId, transportId,
+					false);
+			try {
+				// Create and run the outgoing session
+				createSimplexOutgoingSession(ctx, writer).run();
+				writer.dispose(false);
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+				onError();
+			} finally {
+				connectionRegistry.unregisterConnection(contactId, transportId,
+						false);
+			}
+		}
+
+		private void onError() {
+			disposeOnError(writer);
+		}
+	}
+
+	private class ManageIncomingDuplexConnection implements Runnable {
+
+		private final TransportId transportId;
+		private final TransportConnectionReader reader;
+		private final TransportConnectionWriter writer;
+		private final TransportProperties remote;
+
+		@Nullable
+		private volatile SyncSession outgoingSession = null;
+
+		private ManageIncomingDuplexConnection(TransportId transportId,
+				DuplexTransportConnection connection) {
+			this.transportId = transportId;
+			reader = connection.getReader();
+			writer = connection.getWriter();
+			remote = connection.getRemoteProperties();
+		}
+
+		@Override
+		public void run() {
+			// Read and recognise the tag
+			StreamContext ctx;
+			try {
+				byte[] tag = readTag(reader.getInputStream());
+				ctx = keyManager.getStreamContext(transportId, tag);
+			} catch (IOException | DbException e) {
+				logException(LOG, WARNING, e);
+				onReadError(false);
+				return;
+			}
+			if (ctx == null) {
+				LOG.info("Unrecognised tag");
+				onReadError(false);
+				return;
+			}
+			ContactId contactId = ctx.getContactId();
+			if (contactId == null) {
+				LOG.warning("Expected contact tag, got rendezvous tag");
+				onReadError(true);
+				return;
+			}
+			if (ctx.isHandshakeMode()) {
+				// TODO: Support handshake mode for contacts
+				LOG.warning("Received handshake tag, expected rotation mode");
+				onReadError(true);
+				return;
+			}
+			connectionRegistry.registerConnection(contactId, transportId, true);
+			// Start the outgoing session on another thread
+			ioExecutor.execute(() -> runOutgoingSession(contactId));
+			try {
+				// Store any transport properties discovered from the connection
+				transportPropertyManager.addRemotePropertiesFromConnection(
+						contactId, transportId, remote);
+				// Create and run the incoming session
+				createIncomingSession(ctx, reader).run();
+				reader.dispose(false, true);
+				// Interrupt the outgoing session so it finishes cleanly
+				SyncSession out = outgoingSession;
+				if (out != null) out.interrupt();
+			} catch (DbException | IOException e) {
+				logException(LOG, WARNING, e);
+				onReadError(true);
+			} finally {
+				connectionRegistry.unregisterConnection(contactId, transportId,
+						true);
+			}
+		}
+
+		private void runOutgoingSession(ContactId contactId) {
+			// Allocate a stream context
+			StreamContext ctx;
+			try {
+				ctx = keyManager.getStreamContext(contactId, transportId);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+				onWriteError();
+				return;
+			}
+			if (ctx == null) {
+				LOG.warning("Could not allocate stream context");
+				onWriteError();
+				return;
+			}
+			try {
+				// Create and run the outgoing session
+				SyncSession out = createDuplexOutgoingSession(ctx, writer);
+				outgoingSession = out;
+				out.run();
+				writer.dispose(false);
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+				onWriteError();
+			}
+		}
+
+		private void onReadError(boolean recognised) {
+			disposeOnError(reader, recognised);
+			disposeOnError(writer);
+			// Interrupt the outgoing session so it finishes
+			SyncSession out = outgoingSession;
+			if (out != null) out.interrupt();
+		}
+
+		private void onWriteError() {
+			disposeOnError(reader, true);
+			disposeOnError(writer);
+		}
+	}
+
+	private class ManageOutgoingDuplexConnection implements Runnable {
+
+		private final ContactId contactId;
+		private final TransportId transportId;
+		private final TransportConnectionReader reader;
+		private final TransportConnectionWriter writer;
+		private final TransportProperties remote;
+
+		@Nullable
+		private volatile SyncSession outgoingSession = null;
+
+		private ManageOutgoingDuplexConnection(ContactId contactId,
+				TransportId transportId, DuplexTransportConnection connection) {
+			this.contactId = contactId;
+			this.transportId = transportId;
+			reader = connection.getReader();
+			writer = connection.getWriter();
+			remote = connection.getRemoteProperties();
+		}
+
+		@Override
+		public void run() {
+			// Allocate a stream context
+			StreamContext ctx;
+			try {
+				ctx = keyManager.getStreamContext(contactId, transportId);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+				onWriteError();
+				return;
+			}
+			if (ctx == null) {
+				LOG.warning("Could not allocate stream context");
+				onWriteError();
+				return;
+			}
+			if (ctx.isHandshakeMode()) {
+				// TODO: Support handshake mode for contacts
+				LOG.warning("Cannot use handshake mode stream context");
+				onWriteError();
+				return;
+			}
+			// Start the incoming session on another thread
+			ioExecutor.execute(this::runIncomingSession);
+			try {
+				// Create and run the outgoing session
+				SyncSession out = createDuplexOutgoingSession(ctx, writer);
+				outgoingSession = out;
+				out.run();
+				writer.dispose(false);
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+				onWriteError();
+			}
+		}
+
+		private void runIncomingSession() {
+			// Read and recognise the tag
+			StreamContext ctx;
+			try {
+				byte[] tag = readTag(reader.getInputStream());
+				ctx = keyManager.getStreamContext(transportId, tag);
+			} catch (IOException | DbException e) {
+				logException(LOG, WARNING, e);
+				onReadError();
+				return;
+			}
+			// Unrecognised tags are suspicious in this case
+			if (ctx == null) {
+				LOG.warning("Unrecognised tag for returning stream");
+				onReadError();
+				return;
+			}
+			// Check that the stream comes from the expected contact
+			ContactId inContactId = ctx.getContactId();
+			if (inContactId == null) {
+				LOG.warning("Expected contact tag, got rendezvous tag");
+				onReadError();
+				return;
+			}
+			if (!contactId.equals(inContactId)) {
+				LOG.warning("Wrong contact ID for returning stream");
+				onReadError();
+				return;
+			}
+			if (ctx.isHandshakeMode()) {
+				// TODO: Support handshake mode for contacts
+				LOG.warning("Received handshake tag, expected rotation mode");
+				onReadError();
+				return;
+			}
+			connectionRegistry.registerConnection(contactId, transportId,
+					false);
+			try {
+				// Store any transport properties discovered from the connection
+				transportPropertyManager.addRemotePropertiesFromConnection(
+						contactId, transportId, remote);
+				// Create and run the incoming session
+				createIncomingSession(ctx, reader).run();
+				reader.dispose(false, true);
+				// Interrupt the outgoing session so it finishes cleanly
+				SyncSession out = outgoingSession;
+				if (out != null) out.interrupt();
+			} catch (DbException | IOException e) {
+				logException(LOG, WARNING, e);
+				onReadError();
+			} finally {
+				connectionRegistry.unregisterConnection(contactId, transportId,
+						false);
+			}
+		}
+
+		private void onReadError() {
+			// 'Recognised' is always true for outgoing connections
+			disposeOnError(reader, true);
+			disposeOnError(writer);
+			// Interrupt the outgoing session so it finishes
+			SyncSession out = outgoingSession;
+			if (out != null) out.interrupt();
+		}
+
+		private void onWriteError() {
+			disposeOnError(reader, true);
+			disposeOnError(writer);
+		}
+	}
+
+	private class ManageIncomingHandshakeConnection implements Runnable {
+
+		private final PendingContactId pendingContactId;
+		private final TransportId transportId;
+		private final DuplexTransportConnection connection;
+		private final TransportConnectionReader reader;
+		private final TransportConnectionWriter writer;
+
+		private ManageIncomingHandshakeConnection(
+				PendingContactId pendingContactId, TransportId transportId,
+				DuplexTransportConnection connection) {
+			this.pendingContactId = pendingContactId;
+			this.transportId = transportId;
+			this.connection = connection;
+			reader = connection.getReader();
+			writer = connection.getWriter();
+		}
+
+		@Override
+		public void run() {
+			// Read and recognise the tag
+			StreamContext ctxIn;
+			try {
+				byte[] tag = readTag(reader.getInputStream());
+				ctxIn = keyManager.getStreamContext(transportId, tag);
+			} catch (IOException | DbException e) {
+				logException(LOG, WARNING, e);
+				onError(false);
+				return;
+			}
+			if (ctxIn == null) {
+				LOG.info("Unrecognised tag");
+				onError(false);
+				return;
+			}
+			PendingContactId inPendingContactId = ctxIn.getPendingContactId();
+			if (inPendingContactId == null) {
+				LOG.warning("Expected rendezvous tag, got contact tag");
+				onError(true);
+				return;
+			}
+			// Allocate the outgoing stream context
+			StreamContext ctxOut;
+			try {
+				ctxOut = keyManager.getStreamContext(pendingContactId,
+						transportId);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+				onError(true);
+				return;
+			}
+			if (ctxOut == null) {
+				LOG.warning("Could not allocate stream context");
+				onError(true);
+				return;
+			}
+			// Close the connection if it's redundant
+			if (!connectionRegistry.registerConnection(pendingContactId)) {
+				LOG.info("Redundant rendezvous connection");
+				onError(true);
+				return;
+			}
+			// Handshake and exchange contacts
+			try {
+				InputStream in = streamReaderFactory.createStreamReader(
+						reader.getInputStream(), ctxIn);
+				// Flush the output stream to send the outgoing stream header
+				StreamWriter out = streamWriterFactory.createStreamWriter(
+						writer.getOutputStream(), ctxOut);
+				out.getOutputStream().flush();
+				HandshakeResult result = handshakeManager.handshake(
+						pendingContactId, in, out);
+				Contact contact = contactExchangeManager.exchangeContacts(
+						pendingContactId, connection, result.getMasterKey(),
+						result.isAlice(), false);
+				connectionRegistry.unregisterConnection(pendingContactId, true);
+				// Reuse the connection as a transport connection
+				manageOutgoingConnection(contact.getId(), transportId,
+						connection);
+			} catch (IOException | DbException e) {
+				logException(LOG, WARNING, e);
+				onError(true);
+				connectionRegistry.unregisterConnection(pendingContactId,
+						false);
+			}
+		}
+
+		private void onError(boolean recognised) {
+			disposeOnError(reader, recognised);
+			disposeOnError(writer);
+		}
+	}
+
+	private class ManageOutgoingHandshakeConnection implements Runnable {
+
+		private final PendingContactId pendingContactId;
+		private final TransportId transportId;
+		private final DuplexTransportConnection connection;
+		private final TransportConnectionReader reader;
+		private final TransportConnectionWriter writer;
+
+		private ManageOutgoingHandshakeConnection(
+				PendingContactId pendingContactId, TransportId transportId,
+				DuplexTransportConnection connection) {
+			this.pendingContactId = pendingContactId;
+			this.transportId = transportId;
+			this.connection = connection;
+			reader = connection.getReader();
+			writer = connection.getWriter();
+		}
+
+		@Override
+		public void run() {
+			// Allocate the outgoing stream context
+			StreamContext ctxOut;
+			try {
+				ctxOut = keyManager.getStreamContext(pendingContactId,
+						transportId);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+				onError();
+				return;
+			}
+			if (ctxOut == null) {
+				LOG.warning("Could not allocate stream context");
+				onError();
+				return;
+			}
+			// Flush the output stream to send the outgoing stream header
+			StreamWriter out;
+			try {
+				out = streamWriterFactory.createStreamWriter(
+						writer.getOutputStream(), ctxOut);
+				out.getOutputStream().flush();
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+				onError();
+				return;
+			}
+			// Read and recognise the tag
+			StreamContext ctxIn;
+			try {
+				byte[] tag = readTag(reader.getInputStream());
+				ctxIn = keyManager.getStreamContext(transportId, tag);
+			} catch (IOException | DbException e) {
+				logException(LOG, WARNING, e);
+				onError();
+				return;
+			}
+			// Unrecognised tags are suspicious in this case
+			if (ctxIn == null) {
+				LOG.warning("Unrecognised tag for returning stream");
+				onError();
+				return;
+			}
+			// Check that the stream comes from the expected pending contact
+			PendingContactId inPendingContactId = ctxIn.getPendingContactId();
+			if (inPendingContactId == null) {
+				LOG.warning("Expected rendezvous tag, got contact tag");
+				onError();
+				return;
+			}
+			if (!inPendingContactId.equals(pendingContactId)) {
+				LOG.warning("Wrong pending contact ID for returning stream");
+				onError();
+				return;
+			}
+			// Close the connection if it's redundant
+			if (!connectionRegistry.registerConnection(pendingContactId)) {
+				LOG.info("Redundant rendezvous connection");
+				onError();
+				return;
+			}
+			// Handshake and exchange contacts
+			try {
+				InputStream in = streamReaderFactory.createStreamReader(
+						reader.getInputStream(), ctxIn);
+				HandshakeResult result = handshakeManager.handshake(
+						pendingContactId, in, out);
+				Contact contact = contactExchangeManager.exchangeContacts(
+						pendingContactId, connection, result.getMasterKey(),
+						result.isAlice(), false);
+				connectionRegistry.unregisterConnection(pendingContactId, true);
+				// Reuse the connection as a transport connection
+				manageOutgoingConnection(contact.getId(), transportId,
+						connection);
+			} catch (IOException | DbException e) {
+				logException(LOG, WARNING, e);
+				onError();
+				connectionRegistry.unregisterConnection(pendingContactId,
+						false);
+			}
+		}
+
+		private void onError() {
+			// 'Recognised' is always true for outgoing connections
+			disposeOnError(reader, true);
+			disposeOnError(writer);
+		}
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/plugin/ConnectionRegistryImpl.java

@@ -0,0 +1,223 @@
+package org.briarproject.bramble.plugin;
+
+import org.briarproject.bramble.api.Multiset;
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.PendingContactId;
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.ConnectionRegistry;
+import org.briarproject.bramble.api.plugin.ConnectionStatus;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
+import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
+import org.briarproject.bramble.api.plugin.event.ConnectionStatusChangedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.Scheduler;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.logging.Logger;
+
+import javax.annotation.concurrent.GuardedBy;
+import javax.annotation.concurrent.ThreadSafe;
+import javax.inject.Inject;
+
+import static java.util.Collections.emptyList;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.concurrent.TimeUnit.MINUTES;
+import static java.util.concurrent.TimeUnit.SECONDS;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.plugin.ConnectionStatus.CONNECTED;
+import static org.briarproject.bramble.api.plugin.ConnectionStatus.DISCONNECTED;
+import static org.briarproject.bramble.api.plugin.ConnectionStatus.RECENTLY_CONNECTED;
+
+@ThreadSafe
+@NotNullByDefault
+class ConnectionRegistryImpl implements ConnectionRegistry {
+
+	private static final Logger LOG =
+			getLogger(ConnectionRegistryImpl.class.getName());
+
+	private static final long RECENTLY_CONNECTED_MS = MINUTES.toMillis(1);
+	private static final long EXPIRY_INTERVAL_MS = SECONDS.toMillis(10);
+
+	private final EventBus eventBus;
+	private final Clock clock;
+
+	private final Object lock = new Object();
+	@GuardedBy("lock")
+	private final Map<TransportId, Multiset<ContactId>> contactConnections;
+	@GuardedBy("lock")
+	private final Map<ContactId, Counter> contactCounts;
+	@GuardedBy("lock")
+	private final Set<PendingContactId> connectedPendingContacts;
+
+	@Inject
+	ConnectionRegistryImpl(EventBus eventBus, Clock clock,
+			@Scheduler ScheduledExecutorService scheduler) {
+		this.eventBus = eventBus;
+		this.clock = clock;
+		contactConnections = new HashMap<>();
+		contactCounts = new HashMap<>();
+		connectedPendingContacts = new HashSet<>();
+		scheduler.scheduleWithFixedDelay(this::expireRecentConnections,
+				EXPIRY_INTERVAL_MS, EXPIRY_INTERVAL_MS, MILLISECONDS);
+	}
+
+	@Override
+	public void registerConnection(ContactId c, TransportId t,
+			boolean incoming) {
+		if (LOG.isLoggable(INFO)) {
+			if (incoming) LOG.info("Incoming connection registered: " + t);
+			else LOG.info("Outgoing connection registered: " + t);
+		}
+		boolean firstConnection = false;
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
+			if (m == null) {
+				m = new Multiset<>();
+				contactConnections.put(t, m);
+			}
+			m.add(c);
+
+			Counter counter = contactCounts.get(c);
+			if (counter == null) {
+				counter = new Counter();
+				contactCounts.put(c, counter);
+			}
+			if (counter.connections == 0) {
+				counter.disconnectedTime = 0;
+				firstConnection = true;
+			}
+			counter.connections++;
+		}
+		eventBus.broadcast(new ConnectionOpenedEvent(c, t, incoming));
+		if (firstConnection) {
+			LOG.info("Contact connected");
+			eventBus.broadcast(new ConnectionStatusChangedEvent(c, CONNECTED));
+		}
+	}
+
+	@Override
+	public void unregisterConnection(ContactId c, TransportId t,
+			boolean incoming) {
+		if (LOG.isLoggable(INFO)) {
+			if (incoming) LOG.info("Incoming connection unregistered: " + t);
+			else LOG.info("Outgoing connection unregistered: " + t);
+		}
+		boolean lastConnection = false;
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
+			if (m == null || !m.contains(c))
+				throw new IllegalArgumentException();
+			m.remove(c);
+
+			Counter counter = contactCounts.get(c);
+			if (counter == null || counter.connections == 0) {
+				throw new IllegalArgumentException();
+			}
+			counter.connections--;
+			if (counter.connections == 0) {
+				counter.disconnectedTime = clock.currentTimeMillis();
+				lastConnection = true;
+			}
+		}
+		eventBus.broadcast(new ConnectionClosedEvent(c, t, incoming));
+		if (lastConnection) {
+			LOG.info("Contact disconnected");
+			eventBus.broadcast(
+					new ConnectionStatusChangedEvent(c, RECENTLY_CONNECTED));
+		}
+	}
+
+	@Override
+	public Collection<ContactId> getConnectedContacts(TransportId t) {
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
+			if (m == null) return emptyList();
+			List<ContactId> ids = new ArrayList<>(m.keySet());
+			if (LOG.isLoggable(INFO))
+				LOG.info(ids.size() + " contacts connected: " + t);
+			return ids;
+		}
+	}
+
+	@Override
+	public boolean isConnected(ContactId c, TransportId t) {
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
+			return m != null && m.contains(c);
+		}
+	}
+
+	@Override
+	public ConnectionStatus getConnectionStatus(ContactId c) {
+		synchronized (lock) {
+			Counter counter = contactCounts.get(c);
+			if (counter == null) return DISCONNECTED;
+			return counter.connections > 0 ? CONNECTED : RECENTLY_CONNECTED;
+		}
+	}
+
+	@Override
+	public boolean registerConnection(PendingContactId p) {
+		boolean added;
+		synchronized (lock) {
+			added = connectedPendingContacts.add(p);
+		}
+		if (added) eventBus.broadcast(new RendezvousConnectionOpenedEvent(p));
+		return added;
+	}
+
+	@Override
+	public void unregisterConnection(PendingContactId p, boolean success) {
+		synchronized (lock) {
+			if (!connectedPendingContacts.remove(p))
+				throw new IllegalArgumentException();
+		}
+		eventBus.broadcast(new RendezvousConnectionClosedEvent(p, success));
+	}
+
+	@Scheduler
+	private void expireRecentConnections() {
+		long now = clock.currentTimeMillis();
+		List<ContactId> disconnected = new ArrayList<>();
+		synchronized (lock) {
+			Iterator<Entry<ContactId, Counter>> it =
+					contactCounts.entrySet().iterator();
+			while (it.hasNext()) {
+				Entry<ContactId, Counter> e = it.next();
+				if (e.getValue().isExpired(now)) {
+					disconnected.add(e.getKey());
+					it.remove();
+				}
+			}
+		}
+		for (ContactId c : disconnected) {
+			eventBus.broadcast(
+					new ConnectionStatusChangedEvent(c, DISCONNECTED));
+		}
+	}
+
+	private static class Counter {
+
+		private int connections = 0;
+		private long disconnectedTime = 0;
+
+		private boolean isExpired(long now) {
+			return connections == 0 &&
+					now - disconnectedTime > RECENTLY_CONNECTED_MS;
+		}
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/plugin/PluginManagerImpl.java

@@ -1,15 +1,13 @@
 package org.briarproject.bramble.plugin;
 
-import org.briarproject.bramble.api.connection.ConnectionManager;
-import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.lifecycle.ServiceException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.ConnectionManager;
 import org.briarproject.bramble.api.plugin.Plugin;
-import org.briarproject.bramble.api.plugin.Plugin.State;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.PluginConfig;
 import org.briarproject.bramble.api.plugin.PluginException;
@@ -20,16 +18,14 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
-import org.briarproject.bramble.api.plugin.event.TransportStateEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
-import org.briarproject.bramble.api.system.WakefulIoExecutor;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -40,21 +36,15 @@ import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.concurrent.atomic.AtomicReference;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
-import static java.util.Collections.emptyList;
 import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.plugin.Plugin.PREF_PLUGIN_ENABLE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.DISABLED;
-import static org.briarproject.bramble.api.plugin.Plugin.State.STARTING_STOPPING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
@@ -66,7 +56,7 @@ class PluginManagerImpl implements PluginManager, Service {
 	private static final Logger LOG =
 			getLogger(PluginManagerImpl.class.getName());
 
-	private final Executor ioExecutor, wakefulIoExecutor;
+	private final Executor ioExecutor;
 	private final EventBus eventBus;
 	private final PluginConfig pluginConfig;
 	private final ConnectionManager connectionManager;
@@ -79,15 +69,11 @@ class PluginManagerImpl implements PluginManager, Service {
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
 	@Inject
-	PluginManagerImpl(@IoExecutor Executor ioExecutor,
+	PluginManagerImpl(@IoExecutor Executor ioExecutor, EventBus eventBus,
-			@WakefulIoExecutor Executor wakefulIoExecutor,
+			PluginConfig pluginConfig, ConnectionManager connectionManager,
-			EventBus eventBus,
-			PluginConfig pluginConfig,
-			ConnectionManager connectionManager,
 			SettingsManager settingsManager,
 			TransportPropertyManager transportPropertyManager) {
 		this.ioExecutor = ioExecutor;
-		this.wakefulIoExecutor = wakefulIoExecutor;
 		this.eventBus = eventBus;
 		this.pluginConfig = pluginConfig;
 		this.connectionManager = connectionManager;
@@ -115,7 +101,7 @@ class PluginManagerImpl implements PluginManager, Service {
 				simplexPlugins.add(s);
 				CountDownLatch startLatch = new CountDownLatch(1);
 				startLatches.put(t, startLatch);
-				wakefulIoExecutor.execute(new PluginStarter(s, startLatch));
+				ioExecutor.execute(new PluginStarter(s, startLatch));
 			}
 		}
 		// Instantiate the duplex plugins and start them asynchronously
@@ -131,7 +117,7 @@ class PluginManagerImpl implements PluginManager, Service {
 				duplexPlugins.add(d);
 				CountDownLatch startLatch = new CountDownLatch(1);
 				startLatches.put(t, startLatch);
-				wakefulIoExecutor.execute(new PluginStarter(d, startLatch));
+				ioExecutor.execute(new PluginStarter(d, startLatch));
 			}
 		}
 	}
@@ -143,16 +129,12 @@ class PluginManagerImpl implements PluginManager, Service {
 		LOG.info("Stopping simplex plugins");
 		for (SimplexPlugin s : simplexPlugins) {
 			CountDownLatch startLatch = startLatches.get(s.getId());
-			// Don't need the wakeful executor here as we wait for the plugin
-			// to stop before returning
 			ioExecutor.execute(new PluginStopper(s, startLatch, stopLatch));
 		}
 		// Stop the duplex plugins
 		LOG.info("Stopping duplex plugins");
 		for (DuplexPlugin d : duplexPlugins) {
 			CountDownLatch startLatch = startLatches.get(d.getId());
-			// Don't need the wakeful executor here as we wait for the plugin
-			// to stop before returning
 			ioExecutor.execute(new PluginStopper(d, startLatch, stopLatch));
 		}
 		// Wait for all the plugins to stop
@@ -195,27 +177,7 @@ class PluginManagerImpl implements PluginManager, Service {
 		return supported;
 	}
 
-	@Override
+	private class PluginStarter implements Runnable {
-	public void setPluginEnabled(TransportId t, boolean enabled) {
-		Plugin plugin = plugins.get(t);
-		if (plugin == null) return;
-
-		Settings s = new Settings();
-		s.putBoolean(PREF_PLUGIN_ENABLE, enabled);
-		ioExecutor.execute(() -> mergeSettings(s, t.getString()));
-	}
-
-	private void mergeSettings(Settings s, String namespace) {
-		try {
-			long start = now();
-			settingsManager.mergeSettings(s, namespace);
-			logDuration(LOG, "Merging settings", start);
-		} catch (DbException e) {
-			logException(LOG, WARNING, e);
-		}
-	}
-
-	private static class PluginStarter implements Runnable {
 
 		private final Plugin plugin;
 		private final CountDownLatch startLatch;
@@ -245,7 +207,7 @@ class PluginManagerImpl implements PluginManager, Service {
 		}
 	}
 
-	private static class PluginStopper implements Runnable {
+	private class PluginStopper implements Runnable {
 
 		private final Plugin plugin;
 		private final CountDownLatch startLatch, stopLatch;
@@ -288,8 +250,7 @@ class PluginManagerImpl implements PluginManager, Service {
 	private class Callback implements PluginCallback {
 
 		private final TransportId id;
-		private final AtomicReference<State> state =
+		private final AtomicBoolean enabled = new AtomicBoolean(false);
-				new AtomicReference<>(STARTING_STOPPING);
 
 		private Callback(TransportId id) {
 			this.id = id;
@@ -316,22 +277,14 @@ class PluginManagerImpl implements PluginManager, Service {
 		}
 
 		@Override
-		public Collection<TransportProperties> getRemoteProperties() {
+		public void mergeSettings(Settings s) {
 			try {
-				Map<ContactId, TransportProperties> remote =
+				settingsManager.mergeSettings(s, id.getString());
-						transportPropertyManager.getRemoteProperties(id);
-				return remote.values();
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
-				return emptyList();
 			}
 		}
 
-		@Override
-		public void mergeSettings(Settings s) {
-			PluginManagerImpl.this.mergeSettings(s, id.getString());
-		}
-
 		@Override
 		public void mergeLocalProperties(TransportProperties p) {
 			try {
@@ -342,24 +295,15 @@ class PluginManagerImpl implements PluginManager, Service {
 		}
 
 		@Override
-		public void pluginStateChanged(State newState) {
+		public void transportEnabled() {
-			State oldState = state.getAndSet(newState);
+			if (!enabled.getAndSet(true))
-			if (newState != oldState) {
+				eventBus.broadcast(new TransportEnabledEvent(id));
-				if (LOG.isLoggable(INFO)) {
+		}
-					LOG.info(id + " changed from state " + oldState
+
-							+ " to " + newState);
+		@Override
-				}
+		public void transportDisabled() {
-				eventBus.broadcast(new TransportStateEvent(id, newState));
+			if (enabled.getAndSet(false))
-				if (newState == ACTIVE) {
+				eventBus.broadcast(new TransportDisabledEvent(id));
-					eventBus.broadcast(new TransportActiveEvent(id));
-				} else if (oldState == ACTIVE) {
-					eventBus.broadcast(new TransportInactiveEvent(id));
-				}
-			} else if (newState == DISABLED) {
-				// Broadcast an event even though the state hasn't changed, as
-				// the reasons for the plugin being disabled may have changed
-				eventBus.broadcast(new TransportStateEvent(id, newState));
-			}
 		}
 
 		@Override

bramble-core/src/main/java/org/briarproject/bramble/plugin/PluginModule.java

@@ -3,6 +3,8 @@ package org.briarproject.bramble.plugin;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
+import org.briarproject.bramble.api.plugin.ConnectionManager;
+import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.PluginConfig;
 import org.briarproject.bramble.api.plugin.PluginManager;
 
@@ -27,6 +29,20 @@ public class PluginModule {
 		return new BackoffFactoryImpl();
 	}
 
+	@Provides
+	@Singleton
+	ConnectionManager provideConnectionManager(
+			ConnectionManagerImpl connectionManager) {
+		return connectionManager;
+	}
+
+	@Provides
+	@Singleton
+	ConnectionRegistry provideConnectionRegistry(
+			ConnectionRegistryImpl connectionRegistry) {
+		return connectionRegistry;
+	}
+
 	@Provides
 	@Singleton
 	PluginManager providePluginManager(LifecycleManager lifecycleManager,

bramble-core/src/main/java/org/briarproject/bramble/plugin/PollerImpl.java

@@ -1,8 +1,6 @@
 package org.briarproject.bramble.plugin;
 
 import org.briarproject.bramble.api.Pair;
-import org.briarproject.bramble.api.connection.ConnectionManager;
-import org.briarproject.bramble.api.connection.ConnectionRegistry;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.event.ContactAddedEvent;
 import org.briarproject.bramble.api.db.DbException;
@@ -11,6 +9,8 @@ import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionHandler;
+import org.briarproject.bramble.api.plugin.ConnectionManager;
+import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.PluginManager;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
@@ -20,16 +20,13 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
 import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
-import org.briarproject.bramble.api.plugin.event.TransportActiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
-import org.briarproject.bramble.api.plugin.event.TransportInactiveEvent;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.system.TaskScheduler;
+import org.briarproject.bramble.api.system.Scheduler;
-import org.briarproject.bramble.api.system.TaskScheduler.Cancellable;
-import org.briarproject.bramble.api.system.Wakeful;
-import org.briarproject.bramble.api.system.WakefulIoExecutor;
 
 import java.security.SecureRandom;
 import java.util.ArrayList;
@@ -38,6 +35,8 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.concurrent.Executor;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
@@ -58,8 +57,8 @@ class PollerImpl implements Poller, EventListener {
 
 	private static final Logger LOG = getLogger(PollerImpl.class.getName());
 
-	private final Executor ioExecutor, wakefulIoExecutor;
+	private final Executor ioExecutor;
-	private final TaskScheduler scheduler;
+	private final ScheduledExecutorService scheduler;
 	private final ConnectionManager connectionManager;
 	private final ConnectionRegistry connectionRegistry;
 	private final PluginManager pluginManager;
@@ -72,16 +71,12 @@ class PollerImpl implements Poller, EventListener {
 
 	@Inject
 	PollerImpl(@IoExecutor Executor ioExecutor,
-			@WakefulIoExecutor Executor wakefulIoExecutor,
+			@Scheduler ScheduledExecutorService scheduler,
-			TaskScheduler scheduler,
 			ConnectionManager connectionManager,
-			ConnectionRegistry connectionRegistry,
+			ConnectionRegistry connectionRegistry, PluginManager pluginManager,
-			PluginManager pluginManager,
 			TransportPropertyManager transportPropertyManager,
-			SecureRandom random,
+			SecureRandom random, Clock clock) {
-			Clock clock) {
 		this.ioExecutor = ioExecutor;
-		this.wakefulIoExecutor = wakefulIoExecutor;
 		this.scheduler = scheduler;
 		this.connectionManager = connectionManager;
 		this.connectionRegistry = connectionRegistry;
@@ -103,21 +98,21 @@ class PollerImpl implements Poller, EventListener {
 			ConnectionClosedEvent c = (ConnectionClosedEvent) e;
 			// Reschedule polling, the polling interval may have decreased
 			reschedule(c.getTransportId());
-			// If an outgoing connection failed, try to reconnect
+			if (!c.isIncoming()) {
-			if (!c.isIncoming() && c.isException()) {
+				// Connect to the disconnected contact
 				connectToContact(c.getContactId(), c.getTransportId());
 			}
 		} else if (e instanceof ConnectionOpenedEvent) {
 			ConnectionOpenedEvent c = (ConnectionOpenedEvent) e;
 			// Reschedule polling, the polling interval may have decreased
 			reschedule(c.getTransportId());
-		} else if (e instanceof TransportActiveEvent) {
+		} else if (e instanceof TransportEnabledEvent) {
-			TransportActiveEvent t = (TransportActiveEvent) e;
+			TransportEnabledEvent t = (TransportEnabledEvent) e;
-			// Poll the newly activated transport
+			// Poll the newly enabled transport
 			pollNow(t.getTransportId());
-		} else if (e instanceof TransportInactiveEvent) {
+		} else if (e instanceof TransportDisabledEvent) {
-			TransportInactiveEvent t = (TransportInactiveEvent) e;
+			TransportDisabledEvent t = (TransportDisabledEvent) e;
-			// Cancel polling for the deactivated transport
+			// Cancel polling for the disabled transport
 			cancel(t.getTransportId());
 		}
 	}
@@ -138,7 +133,7 @@ class PollerImpl implements Poller, EventListener {
 	}
 
 	private void connectToContact(ContactId c, SimplexPlugin p) {
-		wakefulIoExecutor.execute(() -> {
+		ioExecutor.execute(() -> {
 			TransportId t = p.getId();
 			if (connectionRegistry.isConnected(c, t)) return;
 			try {
@@ -154,7 +149,7 @@ class PollerImpl implements Poller, EventListener {
 	}
 
 	private void connectToContact(ContactId c, DuplexPlugin p) {
-		wakefulIoExecutor.execute(() -> {
+		ioExecutor.execute(() -> {
 			TransportId t = p.getId();
 			if (connectionRegistry.isConnected(c, t)) return;
 			try {
@@ -191,11 +186,11 @@ class PollerImpl implements Poller, EventListener {
 			if (scheduled == null || due < scheduled.task.due) {
 				// If a later task exists, cancel it. If it's already started
 				// it will abort safely when it finds it's been replaced
-				if (scheduled != null) scheduled.cancellable.cancel();
+				if (scheduled != null) scheduled.future.cancel(false);
 				PollTask task = new PollTask(p, due, randomiseNext);
-				Cancellable cancellable = scheduler.schedule(task, ioExecutor,
+				Future future = scheduler.schedule(() ->
-						delay, MILLISECONDS);
+						ioExecutor.execute(task), delay, MILLISECONDS);
-				tasks.put(t, new ScheduledPollTask(task, cancellable));
+				tasks.put(t, new ScheduledPollTask(task, future));
 			}
 		} finally {
 			lock.unlock();
@@ -206,7 +201,7 @@ class PollerImpl implements Poller, EventListener {
 		lock.lock();
 		try {
 			ScheduledPollTask scheduled = tasks.remove(t);
-			if (scheduled != null) scheduled.cancellable.cancel();
+			if (scheduled != null) scheduled.future.cancel(false);
 		} finally {
 			lock.unlock();
 		}
@@ -220,7 +215,7 @@ class PollerImpl implements Poller, EventListener {
 			Map<ContactId, TransportProperties> remote =
 					transportPropertyManager.getRemoteProperties(t);
 			Collection<ContactId> connected =
-					connectionRegistry.getConnectedOrBetterContacts(t);
+					connectionRegistry.getConnectedContacts(t);
 			Collection<Pair<TransportProperties, ConnectionHandler>>
 					properties = new ArrayList<>();
 			for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
@@ -237,11 +232,11 @@ class PollerImpl implements Poller, EventListener {
 	private class ScheduledPollTask {
 
 		private final PollTask task;
-		private final Cancellable cancellable;
+		private final Future future;
 
-		private ScheduledPollTask(PollTask task, Cancellable cancellable) {
+		private ScheduledPollTask(PollTask task, Future future) {
 			this.task = task;
-			this.cancellable = cancellable;
+			this.future = future;
 		}
 	}
 
@@ -259,7 +254,6 @@ class PollerImpl implements Poller, EventListener {
 
 		@Override
 		@IoExecutor
-		@Wakeful
 		public void run() {
 			lock.lock();
 			try {

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionFactory.java

@@ -1,14 +0,0 @@
-package org.briarproject.bramble.plugin.bluetooth;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-
-import java.io.IOException;
-
-@NotNullByDefault
-interface BluetoothConnectionFactory<S> {
-
-	DuplexTransportConnection wrapSocket(DuplexPlugin plugin, S socket)
-			throws IOException;
-}

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionLimiter.java

@@ -23,9 +23,17 @@ interface BluetoothConnectionLimiter {
 	boolean canOpenContactConnection();
 
 	/**
-	 * Informs the limiter that the given connection has been opened.
+	 * Informs the limiter that a contact connection has been opened. The
+	 * limiter may close the new connection if key agreement is in progress.
+	 * <p/>
+	 * Returns false if the limiter has closed the new connection.
 	 */
-	void connectionOpened(DuplexTransportConnection conn);
+	boolean contactConnectionOpened(DuplexTransportConnection conn);
+
+	/**
+	 * Informs the limiter that a key agreement connection has been opened.
+	 */
+	void keyAgreementConnectionOpened(DuplexTransportConnection conn);
 
 	/**
 	 * Informs the limiter that the given connection has been closed.

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionLimiterImpl.java

@@ -1,48 +1,46 @@
 package org.briarproject.bramble.plugin.bluetooth;
 
-import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-import org.briarproject.bramble.api.sync.event.CloseSyncConnectionsEvent;
 
+import java.io.IOException;
+import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.logging.Logger;
 
-import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.INFO;
-import static java.util.logging.Logger.getLogger;
+import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 @ThreadSafe
 class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 
 	private static final Logger LOG =
-			getLogger(BluetoothConnectionLimiterImpl.class.getName());
+			Logger.getLogger(BluetoothConnectionLimiterImpl.class.getName());
-
-	private final EventBus eventBus;
 
 	private final Object lock = new Object();
-	@GuardedBy("lock")
+	// The following are locking: lock
-	private final List<DuplexTransportConnection> connections =
+	private final LinkedList<DuplexTransportConnection> connections =
 			new LinkedList<>();
-	@GuardedBy("lock")
 	private boolean keyAgreementInProgress = false;
 
-	BluetoothConnectionLimiterImpl(EventBus eventBus) {
-		this.eventBus = eventBus;
-	}
-
 	@Override
 	public void keyAgreementStarted() {
+		List<DuplexTransportConnection> close;
 		synchronized (lock) {
 			keyAgreementInProgress = true;
+			close = new ArrayList<>(connections);
+			connections.clear();
 		}
-		LOG.info("Key agreement started");
+		if (LOG.isLoggable(INFO)) {
-		eventBus.broadcast(new CloseSyncConnectionsEvent(ID));
+			LOG.info("Key agreement started, closing " + close.size() +
+					" connections");
+		}
+		for (DuplexTransportConnection conn : close) tryToClose(conn);
 	}
 
 	@Override
@@ -67,22 +65,44 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 	}
 
 	@Override
-	public void connectionOpened(DuplexTransportConnection conn) {
+	public boolean contactConnectionOpened(DuplexTransportConnection conn) {
+		boolean accept = true;
 		synchronized (lock) {
-			connections.add(conn);
+			if (keyAgreementInProgress) {
-			if (LOG.isLoggable(INFO)) {
+				LOG.info("Refusing contact connection during key agreement");
-				LOG.info("Connection opened, " + connections.size() + " open");
+				accept = false;
+			} else {
+				LOG.info("Accepting contact connection");
+				connections.add(conn);
 			}
 		}
+		if (!accept) tryToClose(conn);
+		return accept;
+	}
+
+	@Override
+	public void keyAgreementConnectionOpened(DuplexTransportConnection conn) {
+		synchronized (lock) {
+			LOG.info("Accepting key agreement connection");
+			connections.add(conn);
+		}
+	}
+
+	private void tryToClose(DuplexTransportConnection conn) {
+		try {
+			conn.getWriter().dispose(false);
+			conn.getReader().dispose(false, false);
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
 	}
 
 	@Override
 	public void connectionClosed(DuplexTransportConnection conn) {
 		synchronized (lock) {
 			connections.remove(conn);
-			if (LOG.isLoggable(INFO)) {
+			if (LOG.isLoggable(INFO))
 				LOG.info("Connection closed, " + connections.size() + " open");
-			}
 		}
 	}