Fix circular dependency between scheduler and wake lock manager.

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

@@ -1,6 +1,7 @@
 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;
@@ -8,6 +9,9 @@ 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;
 
@@ -17,6 +21,23 @@ 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(

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

@@ -7,9 +7,7 @@ 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.RejectedExecutionHandler;
 import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledThreadPoolExecutor;
 
 import javax.inject.Inject;
 import javax.inject.Singleton;
@@ -25,21 +23,12 @@ public class AndroidTaskSchedulerModule {
 		AndroidTaskScheduler scheduler;
 	}
 
-	private final ScheduledExecutorService scheduledExecutorService;
-
-	public AndroidTaskSchedulerModule() {
-		// Discard tasks that are submitted during shutdown
-		RejectedExecutionHandler policy =
-				new ScheduledThreadPoolExecutor.DiscardPolicy();
-		scheduledExecutorService = new ScheduledThreadPoolExecutor(1, policy);
-	}
-
 	@Provides
 	@Singleton
 	AndroidTaskScheduler provideAndroidTaskScheduler(
 			LifecycleManager lifecycleManager, Application app,
-			AndroidWakeLockManager wakeLockManager) {
-		lifecycleManager.registerForShutdown(scheduledExecutorService);
+			AndroidWakeLockManager wakeLockManager,
+			ScheduledExecutorService scheduledExecutorService) {
 		AndroidTaskScheduler scheduler = new AndroidTaskScheduler(app,
 				wakeLockManager, scheduledExecutorService);
 		lifecycleManager.registerService(scheduler);

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

@@ -6,13 +6,12 @@ import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.os.PowerManager;
 
-import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.system.AndroidWakeLock;
 import org.briarproject.bramble.api.system.AndroidWakeLockManager;
-import org.briarproject.bramble.api.system.TaskScheduler;
 
 import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
 
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
@@ -41,15 +40,14 @@ class AndroidWakeLockManagerImpl implements AndroidWakeLockManager {
 	private final SharedWakeLock sharedWakeLock;
 
 	@Inject
-	AndroidWakeLockManagerImpl(TaskScheduler scheduler,
-			@EventExecutor Executor eventExecutor,
-			Application app) {
+	AndroidWakeLockManagerImpl(Application app,
+			ScheduledExecutorService scheduledExecutorService) {
 		PowerManager powerManager = (PowerManager)
 				requireNonNull(app.getSystemService(POWER_SERVICE));
 		String tag = getWakeLockTag(app);
-		sharedWakeLock = new RenewableWakeLock(powerManager, scheduler,
-				eventExecutor, PARTIAL_WAKE_LOCK, tag, LOCK_DURATION_MS,
-				SAFETY_MARGIN_MS);
+		sharedWakeLock = new RenewableWakeLock(powerManager,
+				scheduledExecutorService, PARTIAL_WAKE_LOCK, tag,
+				LOCK_DURATION_MS, SAFETY_MARGIN_MS);
 	}
 
 	@Override

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

@@ -4,10 +4,9 @@ import android.os.PowerManager;
 import android.os.PowerManager.WakeLock;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.TaskScheduler;
 
-import java.util.concurrent.Executor;
 import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
@@ -28,8 +27,7 @@ class RenewableWakeLock implements SharedWakeLock {
 			getLogger(RenewableWakeLock.class.getName());
 
 	private final PowerManager powerManager;
-	private final TaskScheduler scheduler;
-	private final Executor eventExecutor;
+	private final ScheduledExecutorService scheduledExecutorService;
 	private final int levelAndFlags;
 	private final String tag;
 	private final long durationMs, safetyMarginMs;
@@ -47,15 +45,13 @@ class RenewableWakeLock implements SharedWakeLock {
 	private long acquired = 0;
 
 	RenewableWakeLock(PowerManager powerManager,
-			TaskScheduler scheduler,
-			Executor eventExecutor,
+			ScheduledExecutorService scheduledExecutorService,
 			int levelAndFlags,
 			String tag,
 			long durationMs,
 			long safetyMarginMs) {
 		this.powerManager = powerManager;
-		this.scheduler = scheduler;
-		this.eventExecutor = eventExecutor;
+		this.scheduledExecutorService = scheduledExecutorService;
 		this.levelAndFlags = levelAndFlags;
 		this.tag = tag;
 		this.durationMs = durationMs;
@@ -76,7 +72,7 @@ class RenewableWakeLock implements SharedWakeLock {
 				//  power management apps
 				wakeLock.setReferenceCounted(false);
 				wakeLock.acquire(durationMs + safetyMarginMs);
-				future = scheduler.schedule(this::renew, eventExecutor,
+				future = scheduledExecutorService.schedule(this::renew,
 						durationMs, MILLISECONDS);
 				acquired = android.os.SystemClock.elapsedRealtime();
 			}
@@ -100,8 +96,8 @@ class RenewableWakeLock implements SharedWakeLock {
 			wakeLock.setReferenceCounted(false);
 			wakeLock.acquire(durationMs + safetyMarginMs);
 			oldWakeLock.release();
-			future = scheduler.schedule(this::renew, eventExecutor,
-					durationMs, MILLISECONDS);
+			future = scheduledExecutorService.schedule(this::renew, durationMs,
+					MILLISECONDS);
 			acquired = now;
 		}
 	}