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Code Issues Releases Wiki Activity

Migrated Roster Item Exchange to new manager design

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The finalize approach was flawed anyway, it would have never been
called. Because if the packetListener was still referenced from a
connection, and the connection was still strong referenced, then a
strong reference from a gc root would still exists to the manager, which
would prevent it from being gc'ed and finalized being called.
This commit is contained in:
Florian Schmaus 2014-03-03 11:53:55 +01:00
parent 14b43581dc
commit fa289eac04
2 changed files with 49 additions and 48 deletions
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88
extensions/src/main/java/org/jivesoftware/smackx/xroster/RosterExchangeManager.java
View file

@ -14,12 +14,15 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.xroster;
import java.util.ArrayList;
import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.Roster;
@ -43,21 +46,46 @@ import org.jivesoftware.smackx.xroster.packet.RosterExchange;
*/
public class RosterExchangeManager {
private List<RosterExchangeListener> rosterExchangeListeners = new ArrayList<RosterExchangeListener>();
public final static String NAMESPACE = "jabber:x:roster";
public final static String ELEMENT = "x";
private Connection con;
private final static Map<Connection, RosterExchangeManager> INSTANCES =
Collections.synchronizedMap(new WeakHashMap<Connection, RosterExchangeManager>());
private PacketFilter packetFilter = new PacketExtensionFilter("x", "jabber:x:roster");
private PacketListener packetListener;
private final static PacketFilter PACKET_FILTER = new PacketExtensionFilter(ELEMENT, NAMESPACE);
private final Set<RosterExchangeListener> rosterExchangeListeners = Collections.synchronizedSet(new HashSet<RosterExchangeListener>());
private final WeakReference<Connection> weakRefConnection;
private final PacketListener packetListener;
public synchronized static RosterExchangeManager getInstanceFor(Connection connection) {
RosterExchangeManager rosterExchangeManager = INSTANCES.get(connection);
if (rosterExchangeManager == null) {
rosterExchangeManager = new RosterExchangeManager(connection);
}
return rosterExchangeManager;
}
/**
* Creates a new roster exchange manager.
*
* @param con a Connection which is used to send and receive messages.
*/
public RosterExchangeManager(Connection con) {
this.con = con;
init();
public RosterExchangeManager(Connection connection) {
weakRefConnection = new WeakReference<Connection>(connection);
// Listens for all roster exchange packets and fire the roster exchange listeners.
packetListener = new PacketListener() {
public void processPacket(Packet packet) {
Message message = (Message) packet;
RosterExchange rosterExchange =
(RosterExchange) message.getExtension(ELEMENT, NAMESPACE);
// Fire event for roster exchange listeners
fireRosterExchangeListeners(message.getFrom(), rosterExchange.getRosterEntries());
};
};
connection.addPacketListener(packetListener, PACKET_FILTER);
}
/**
@ -67,12 +95,8 @@ public class RosterExchangeManager {
* @param rosterExchangeListener a roster exchange listener.
*/
public void addRosterListener(RosterExchangeListener rosterExchangeListener) {
synchronized (rosterExchangeListeners) {
if (!rosterExchangeListeners.contains(rosterExchangeListener)) {
rosterExchangeListeners.add(rosterExchangeListener);
}
}
}
/**
* Removes a listener from roster exchanges. The listener will be fired anytime roster
@ -81,10 +105,8 @@ public class RosterExchangeManager {
* @param rosterExchangeListener a roster exchange listener..
*/
public void removeRosterListener(RosterExchangeListener rosterExchangeListener) {
synchronized (rosterExchangeListeners) {
rosterExchangeListeners.remove(rosterExchangeListener);
}
}
/**
* Sends a roster to userID. All the entries of the roster will be sent to the
@ -100,8 +122,9 @@ public class RosterExchangeManager {
RosterExchange rosterExchange = new RosterExchange(roster);
msg.addExtension(rosterExchange);
Connection connection = weakRefConnection.get();
// Send the message that contains the roster
con.sendPacket(msg);
connection.sendPacket(msg);
}
/**
@ -118,8 +141,9 @@ public class RosterExchangeManager {
rosterExchange.addRosterEntry(rosterEntry);
msg.addExtension(rosterExchange);
Connection connection = weakRefConnection.get();
// Send the message that contains the roster
con.sendPacket(msg);
connection.sendPacket(msg);
}
/**
@ -139,8 +163,9 @@ public class RosterExchangeManager {
}
msg.addExtension(rosterExchange);
Connection connection = weakRefConnection.get();
// Send the message that contains the roster
con.sendPacket(msg);
connection.sendPacket(msg);
}
/**
@ -156,29 +181,4 @@ public class RosterExchangeManager {
listeners[i].entriesReceived(from, remoteRosterEntries);
}
}
private void init() {
// Listens for all roster exchange packets and fire the roster exchange listeners.
packetListener = new PacketListener() {
public void processPacket(Packet packet) {
Message message = (Message) packet;
RosterExchange rosterExchange =
(RosterExchange) message.getExtension("x", "jabber:x:roster");
// Fire event for roster exchange listeners
fireRosterExchangeListeners(message.getFrom(), rosterExchange.getRosterEntries());
};
};
con.addPacketListener(packetListener, packetFilter);
}
public void destroy() {
if (con != null)
con.removePacketListener(packetListener);
}
protected void finalize() throws Throwable {
destroy();
super.finalize();
}
}

5
extensions/src/main/java/org/jivesoftware/smackx/xroster/packet/RosterExchange.java
View file

@ -22,6 +22,7 @@ import org.jivesoftware.smack.RosterEntry;
import org.jivesoftware.smack.RosterGroup;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smackx.xroster.RemoteRosterEntry;
import org.jivesoftware.smackx.xroster.RosterExchangeManager;
import java.util.ArrayList;
import java.util.Collections;
@ -110,7 +111,7 @@ public class RosterExchange implements PacketExtension {
* @return the XML element name of the packet extension.
*/
public String getElementName() {
return "x";
return RosterExchangeManager.ELEMENT;
}
/**
@ -121,7 +122,7 @@ public class RosterExchange implements PacketExtension {
* @return the XML namespace of the packet extension.
*/
public String getNamespace() {
return "jabber:x:roster";
return RosterExchangeManager.NAMESPACE;
}
/**