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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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8
experimental/source/org/jivesoftware/smackx/carbons/CarbonManager.java
View file

@ -16,6 +16,7 @@
package org.jivesoftware.smackx.carbons;
import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
@ -56,13 +57,13 @@ public class CarbonManager {
});
}
private Connection connection;
private WeakReference<Connection> weakRefConnection;
private volatile boolean enabled_state = false;
private CarbonManager(Connection connection) {
ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
sdm.addFeature(Carbon.NAMESPACE);
this.connection = connection;
weakRefConnection = new WeakReference<Connection>(connection);
instances.put(connection, this);
}
@ -99,6 +100,7 @@ public class CarbonManager {
* @return true if supported
*/
public boolean isSupportedByServer() {
Connection connection = weakRefConnection.get();
try {
DiscoverInfo result = ServiceDiscoveryManager
.getInstanceFor(connection).discoverInfo(connection.getServiceName());
@ -118,6 +120,7 @@ public class CarbonManager {
* @param new_state whether carbons should be enabled or disabled
*/
public void sendCarbonsEnabled(final boolean new_state) {
final Connection connection = weakRefConnection.get();
IQ setIQ = carbonsEnabledIQ(new_state);
connection.addPacketListener(new PacketListener() {
@ -148,6 +151,7 @@ public class CarbonManager {
if (enabled_state == new_state)
return true;
Connection connection = weakRefConnection.get();
IQ setIQ = carbonsEnabledIQ(new_state);
PacketCollector collector =

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);

1
source/org/jivesoftware/smackx/MessageEventManager.java
View file

@ -20,7 +20,6 @@
package org.jivesoftware.smackx;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Iterator;

12
source/org/jivesoftware/smackx/ping/PingManager.java
View file

@ -16,6 +16,7 @@
package org.jivesoftware.smackx.ping;
import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
@ -65,7 +66,7 @@ public class PingManager {
});
}
private Connection connection;
private WeakReference<Connection> weakRefConnection;
/**
* Retrieves a {@link PingManager} for the specified {@link Connection}, creating one if it doesn't already
@ -84,8 +85,8 @@ public class PingManager {
return pingManager;
}
private PingManager(Connection con) {
this.connection = con;
private PingManager(Connection connection) {
weakRefConnection = new WeakReference<Connection>(connection);
ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
// The ServiceDiscoveryManager was not pre-initialized
@ -101,6 +102,7 @@ public class PingManager {
* Sends a Pong for every Ping
*/
public void processPacket(Packet packet) {
Connection connection = weakRefConnection.get();
IQ pong = IQ.createResultIQ((Ping) packet);
connection.sendPacket(pong);
}
@ -121,7 +123,7 @@ public class PingManager {
*/
public boolean ping(String jid, long pingTimeout) {
Ping ping = new Ping(jid);
Connection connection = weakRefConnection.get();
try {
SyncPacketSend.getReply(connection, ping);
}
@ -151,6 +153,7 @@ public class PingManager {
* @throws XMPPException An XMPP related error occurred during the request
*/
public boolean isPingSupported(String jid) throws XMPPException {
Connection connection = weakRefConnection.get();
DiscoverInfo result = ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(jid);
return result.containsFeature(Ping.NAMESPACE);
}
@ -165,6 +168,7 @@ public class PingManager {
* @return true if a reply was received from the server, false otherwise.
*/
public boolean pingMyServer() {
Connection connection = weakRefConnection.get();
return ping(connection.getServiceName());
}
}

7
source/org/jivesoftware/smackx/receipts/DeliveryReceiptManager.java
View file

@ -16,6 +16,7 @@
package org.jivesoftware.smackx.receipts;
import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
@ -52,7 +53,7 @@ public class DeliveryReceiptManager implements PacketListener {
});
}
private Connection connection;
private WeakReference<Connection> weakRefConnection;
private boolean auto_receipts_enabled = false;
private Set<ReceiptReceivedListener> receiptReceivedListeners = Collections
.synchronizedSet(new HashSet<ReceiptReceivedListener>());
@ -60,7 +61,7 @@ public class DeliveryReceiptManager implements PacketListener {
private DeliveryReceiptManager(Connection connection) {
ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
sdm.addFeature(DeliveryReceipt.NAMESPACE);
this.connection = connection;
weakRefConnection = new WeakReference<Connection>(connection);
instances.put(connection, this);
// register listener for delivery receipts and requests
@ -91,6 +92,7 @@ public class DeliveryReceiptManager implements PacketListener {
* @return true if supported
*/
public boolean isSupported(String jid) {
Connection connection = weakRefConnection.get();
try {
DiscoverInfo result =
ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(jid);
@ -119,6 +121,7 @@ public class DeliveryReceiptManager implements PacketListener {
DeliveryReceiptRequest drr = (DeliveryReceiptRequest)packet.getExtension(
DeliveryReceiptRequest.ELEMENT, DeliveryReceipt.NAMESPACE);
if (drr != null) {
Connection connection = weakRefConnection.get();
Message ack = new Message(packet.getFrom(), Message.Type.normal);
ack.addExtension(new DeliveryReceipt(packet.getPacketID()));
connection.sendPacket(ack);