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Code Issues Projects Releases Wiki Activity

Avoid making alien calls with locks held.

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This commit is contained in:
akwizgran
2011-12-10 19:21:00 +00:00
parent cbc5fd1bb4
commit 3e61adb623
5 changed files with 106 additions and 68 deletions
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105
components/net/sf/briar/plugins/bluetooth/BluetoothPlugin.java
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@@ -1,14 +1,13 @@
package net.sf.briar.plugins.bluetooth;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
@@ -48,8 +47,9 @@ class BluetoothPlugin implements StreamPlugin {
private final StreamPluginCallback callback;
private final long pollingInterval;
private final Object discoveryLock = new Object();
private final Object localPropertiesLock = new Object();
private final ScheduledExecutorService scheduler;
private final Set<StreamConnectionNotifier> sockets; // Locking: this
private final Collection<StreamConnectionNotifier> sockets; // Locking: this
private boolean running = false; // Locking: this
private LocalDevice localDevice = null; // Locking: this
@@ -61,7 +61,7 @@ class BluetoothPlugin implements StreamPlugin {
this.callback = callback;
this.pollingInterval = pollingInterval;
scheduler = Executors.newScheduledThreadPool(0);
sockets = new HashSet<StreamConnectionNotifier>();
sockets = new ArrayList<StreamConnectionNotifier>();
}
public TransportId getId() {
@@ -70,19 +70,21 @@ class BluetoothPlugin implements StreamPlugin {
public void start() throws IOException {
// Initialise the Bluetooth stack
LocalDevice localDevice;
try {
synchronized(this) {
running = true;
localDevice = LocalDevice.getLocalDevice();
if(LOG.isLoggable(Level.INFO))
LOG.info("Address " + localDevice.getBluetoothAddress());
}
localDevice = LocalDevice.getLocalDevice();
} catch(UnsatisfiedLinkError e) {
// On Linux the user may need to install libbluetooth-dev
if(OsUtils.isLinux())
callback.showMessage("BLUETOOTH_INSTALL_LIBS");
throw new IOException(e.toString());
}
if(LOG.isLoggable(Level.INFO))
LOG.info("Address " + localDevice.getBluetoothAddress());
synchronized(this) {
running = true;
this.localDevice = localDevice;
}
pluginExecutor.execute(new Runnable() {
public void run() {
bind();
@@ -91,13 +93,11 @@ class BluetoothPlugin implements StreamPlugin {
}
private void bind() {
String uuid;
synchronized(this) {
if(!running) return;
uuid = getUuid();
makeDeviceDiscoverable();
}
String url = "btspp://localhost:" + uuid + ";name=RFCOMM";
makeDeviceDiscoverable();
String url = "btspp://localhost:" + getUuid() + ";name=RFCOMM";
StreamConnectionNotifier scn;
try {
scn = (StreamConnectionNotifier) Connector.open(url);
@@ -115,24 +115,30 @@ class BluetoothPlugin implements StreamPlugin {
acceptContactConnections(scn);
}
private synchronized String getUuid() {
assert running;
TransportProperties p = callback.getLocalProperties();
String uuid = p.get("uuid");
if(uuid == null) {
// Generate a (weakly) random UUID and store it
byte[] b = new byte[16];
new Random().nextBytes(b);
uuid = StringUtils.toHexString(b);
p.put("uuid", uuid);
callback.setLocalProperties(p);
private String getUuid() {
// FIXME: Avoid making alien calls with a lock held
synchronized(localPropertiesLock) {
TransportProperties p = callback.getLocalProperties();
String uuid = p.get("uuid");
if(uuid == null) {
// Generate a (weakly) random UUID and store it
byte[] b = new byte[16];
new Random().nextBytes(b);
uuid = StringUtils.toHexString(b);
p.put("uuid", uuid);
callback.setLocalProperties(p);
}
return uuid;
}
return uuid;
}
private synchronized void makeDeviceDiscoverable() {
assert running;
private void makeDeviceDiscoverable() {
// Try to make the device discoverable (requires root on Linux)
LocalDevice localDevice;
synchronized(this) {
if(!running) return;
localDevice = this.localDevice;
}
try {
localDevice.setDiscoverable(DiscoveryAgent.GIAC);
} catch(BluetoothStateException e) {
@@ -140,9 +146,12 @@ class BluetoothPlugin implements StreamPlugin {
}
// Advertise the address to contacts if the device is discoverable
if(localDevice.getDiscoverable() != DiscoveryAgent.NOT_DISCOVERABLE) {
TransportProperties p = callback.getLocalProperties();
p.put("address", localDevice.getBluetoothAddress());
callback.setLocalProperties(p);
// FIXME: Avoid making alien calls with a lock held
synchronized(localPropertiesLock) {
TransportProperties p = callback.getLocalProperties();
p.put("address", localDevice.getBluetoothAddress());
callback.setLocalProperties(p);
}
}
}
@@ -174,16 +183,18 @@ class BluetoothPlugin implements StreamPlugin {
}
}
public synchronized void stop() {
running = false;
localDevice = null;
scheduler.shutdownNow();
for(StreamConnectionNotifier scn : sockets) tryToClose(scn);
sockets.clear();
if(socket != null) {
tryToClose(socket);
socket = null;
public void stop() {
synchronized(this) {
running = false;
localDevice = null;
for(StreamConnectionNotifier scn : sockets) tryToClose(scn);
sockets.clear();
if(socket != null) {
tryToClose(socket);
socket = null;
}
}
scheduler.shutdownNow();
}
public boolean shouldPoll() {
@@ -224,11 +235,12 @@ class BluetoothPlugin implements StreamPlugin {
private Map<ContactId, String> discoverContactUrls(
Map<ContactId, TransportProperties> remote) {
DiscoveryAgent discoveryAgent;
LocalDevice localDevice;
synchronized(this) {
if(!running) return Collections.emptyMap();
discoveryAgent = localDevice.getDiscoveryAgent();
localDevice = this.localDevice;
}
DiscoveryAgent discoveryAgent = localDevice.getDiscoveryAgent();
Map<String, ContactId> addresses = new HashMap<String, ContactId>();
Map<ContactId, String> uuids = new HashMap<ContactId, String>();
for(Entry<ContactId, TransportProperties> e : remote.entrySet()) {
@@ -245,6 +257,7 @@ class BluetoothPlugin implements StreamPlugin {
ContactListener listener = new ContactListener(discoveryAgent,
Collections.unmodifiableMap(addresses),
Collections.unmodifiableMap(uuids));
// FIXME: Avoid making alien calls with a lock held
synchronized(discoveryLock) {
try {
discoveryAgent.startInquiry(DiscoveryAgent.GIAC, listener);
@@ -335,17 +348,19 @@ class BluetoothPlugin implements StreamPlugin {
}
private void createInvitationConnection(ConnectionCallback c) {
DiscoveryAgent discoveryAgent;
LocalDevice localDevice;
synchronized(this) {
if(!running) return;
discoveryAgent = localDevice.getDiscoveryAgent();
localDevice = this.localDevice;
}
DiscoveryAgent discoveryAgent = localDevice.getDiscoveryAgent();
// Try to discover the other party until the invitation times out
long end = System.currentTimeMillis() + c.getTimeout();
String url = null;
while(url == null && System.currentTimeMillis() < end) {
InvitationListener listener = new InvitationListener(discoveryAgent,
c.getUuid());
// FIXME: Avoid making alien calls with a lock held
synchronized(discoveryLock) {
try {
discoveryAgent.startInquiry(DiscoveryAgent.GIAC, listener);
@@ -378,8 +393,8 @@ class BluetoothPlugin implements StreamPlugin {
private void bindInvitationSocket(final ConnectionCallback c) {
synchronized(this) {
if(!running) return;
makeDeviceDiscoverable();
}
makeDeviceDiscoverable();
String url = "btspp://localhost:" + c.getUuid() + ";name=RFCOMM";
final StreamConnectionNotifier scn;
try {