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Code Issues Releases Wiki Activity

Convert Connection references to weak references

Browse source 
If a Manager is strong referenced from a gc root, usually the instances
map, it should not hold itself a strong reference the connection in
order to avoid a cycle that prevents the Connection instance from being
gc'ed.

SMACK-383
This commit is contained in:
Florian Schmaus 2014-02-07 13:17:36 +01:00
parent 666f555733
commit 9c61c6c945
5 changed files with 46 additions and 35 deletions
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53
source/org/jivesoftware/smack/keepalive/KeepAliveManager.java
View file

@ -16,12 +16,12 @@
package org.jivesoftware.smack.keepalive;
import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
@ -52,7 +52,7 @@ import org.jivesoftware.smack.ping.packet.Ping;
* @author Florian Schmaus
*/
public class KeepAliveManager {
private static Map<Connection, KeepAliveManager> instances = new HashMap<Connection, KeepAliveManager>();
private static Map<Connection, KeepAliveManager> instances = Collections.synchronizedMap(new WeakHashMap<Connection, KeepAliveManager>());
private static volatile ScheduledExecutorService periodicPingExecutorService;
static {
@ -65,7 +65,7 @@ public class KeepAliveManager {
}
}
private Connection connection;
private WeakReference<Connection> weakRefConnection;
private long pingInterval = SmackConfiguration.getKeepAliveInterval();
private Set<PingFailedListener> pingFailedListeners = Collections.synchronizedSet(new HashSet<PingFailedListener>());
private volatile ScheduledFuture<?> periodicPingTask;
@ -120,40 +120,21 @@ public class KeepAliveManager {
}
private KeepAliveManager(Connection connection) {
this.connection = connection;
init();
handleConnect();
}
weakRefConnection = new WeakReference<Connection>(connection);
/*
* Call after every connection to add the packet listener.
*/
private void handleConnect() {
// Listen for all incoming packets and reset the scheduled ping whenever
// one arrives.
connection.addPacketListener(new PacketListener() {
@Override
public void processPacket(Packet packet) {
// reschedule the ping based on this last server contact
lastSuccessfulContact = System.currentTimeMillis();
schedulePingServerTask();
}
}, null);
}
private void init() {
connection.addConnectionListener(new ConnectionListener() {
@Override
public void connectionClosed() {
stopPingServerTask();
Connection connection = weakRefConnection.get();
handleDisconnect(connection);
}
@Override
public void connectionClosedOnError(Exception arg0) {
stopPingServerTask();
Connection connection = weakRefConnection.get();
handleDisconnect(connection);
}
@ -174,6 +155,25 @@ public class KeepAliveManager {
instances.put(connection, this);
schedulePingServerTask();
handleConnect();
}
/*
* Call after every connection to add the packet listener.
*/
private void handleConnect() {
Connection connection = weakRefConnection.get();
// Listen for all incoming packets and reset the scheduled ping whenever
// one arrives.
connection.addPacketListener(new PacketListener() {
@Override
public void processPacket(Packet packet) {
// reschedule the ping based on this last server contact
lastSuccessfulContact = System.currentTimeMillis();
schedulePingServerTask();
}
}, null);
}
/**
@ -276,6 +276,7 @@ public class KeepAliveManager {
public void run() {
Ping ping = new Ping();
PacketFilter responseFilter = new PacketIDFilter(ping.getPacketID());
Connection connection = weakRefConnection.get();
final PacketCollector response = pingFailedListeners.isEmpty() ? null : connection.createPacketCollector(responseFilter);
connection.sendPacket(ping);