/**
* $RCSfile$
* $Revision: 2779 $
* $Date: 2005-09-05 17:00:45 -0300 (Mon, 05 Sep 2005) $
*
* Copyright 2003-2006 Jive Software.
*
* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.muc;
import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.util.StringUtils;
import java.lang.ref.WeakReference;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
/**
* A <code>RoomListenerMultiplexor</code> multiplexes incoming packets on
* a <code>Connection</code> using a single listener/filter pair.
* A single <code>RoomListenerMultiplexor</code> is created for each
* {@link org.jivesoftware.smack.Connection} that has joined MUC rooms
* within its session.
*
* @author Larry Kirschner
*/
class RoomListenerMultiplexor implements ConnectionListener {
// We use a WeakHashMap so that the GC can collect the monitor when the
// connection is no longer referenced by any object.
private static final Map<Connection, WeakReference<RoomListenerMultiplexor>> monitors =
new WeakHashMap<Connection, WeakReference<RoomListenerMultiplexor>>();
private Connection connection;
private RoomMultiplexFilter filter;
private RoomMultiplexListener listener;
/**
* Returns a new or existing RoomListenerMultiplexor for a given connection.
*
* @param conn the connection to monitor for room invitations.
* @return a new or existing RoomListenerMultiplexor for a given connection.
*/
public static RoomListenerMultiplexor getRoomMultiplexor(Connection conn) {
synchronized (monitors) {
if (!monitors.containsKey(conn) || monitors.get(conn).get() == null) {
RoomListenerMultiplexor rm = new RoomListenerMultiplexor(conn, new RoomMultiplexFilter(),
new RoomMultiplexListener());
rm.init();
// We need to use a WeakReference because the monitor references the
// connection and this could prevent the GC from collecting the monitor
// when no other object references the monitor
monitors.put(conn, new WeakReference<RoomListenerMultiplexor>(rm));
}
// Return the InvitationsMonitor that monitors the connection
return monitors.get(conn).get();
}
}
/**
* All access should be through
* the static method {@link #getRoomMultiplexor(Connection)}.
*/
private RoomListenerMultiplexor(Connection connection, RoomMultiplexFilter filter,
RoomMultiplexListener listener) {
if (connection == null) {
throw new IllegalArgumentException("Connection is null");
}
if (filter == null) {
throw new IllegalArgumentException("Filter is null");
}
if (listener == null) {
throw new IllegalArgumentException("Listener is null");
}
this.connection = connection;
this.filter = filter;
this.listener = listener;
}
public void addRoom(String address, PacketMultiplexListener roomListener) {
filter.addRoom(address);
listener.addRoom(address, roomListener);
}
public void connectionClosed() {
cancel();
}
public void connectionClosedOnError(Exception e) {
cancel();
}
public void reconnectingIn(int seconds) {
// ignore
}
public void reconnectionSuccessful() {
// ignore
}
public void reconnectionFailed(Exception e) {
// ignore
}
/**
* Initializes the listeners to detect received room invitations and to detect when the
* connection gets closed. As soon as a room invitation is received the invitations
* listeners will be fired. When the connection gets closed the monitor will remove
* his listeners on the connection.
*/
public void init() {
connection.addConnectionListener(this);
connection.addPacketListener(listener, filter);
}
public void removeRoom(String address) {
filter.removeRoom(address);
listener.removeRoom(address);
}
/**
* Cancels all the listeners that this InvitationsMonitor has added to the connection.
*/
private void cancel() {
connection.removeConnectionListener(this);
connection.removePacketListener(listener);
}
/**
* The single <code>Connection</code>-level <code>PacketFilter</code> used by a {@link RoomListenerMultiplexor}
* for all muc chat rooms on an <code>Connection</code>.
* Each time a muc chat room is added to/removed from an
* <code>Connection</code> the address for that chat room
* is added to/removed from that <code>Connection</code>'s
* <code>RoomMultiplexFilter</code>.
*/
private static class RoomMultiplexFilter implements PacketFilter {
private Map<String, String> roomAddressTable = new ConcurrentHashMap<String, String>();
public boolean accept(Packet p) {
String from = p.getFrom();
if (from == null) {
return false;
}
return roomAddressTable.containsKey(StringUtils.parseBareAddress(from).toLowerCase());
}
public void addRoom(String address) {
if (address == null) {
return;
}
roomAddressTable.put(address.toLowerCase(), address);
}
public void removeRoom(String address) {
if (address == null) {
return;
}
roomAddressTable.remove(address.toLowerCase());
}
}
/**
* The single <code>Connection</code>-level <code>PacketListener</code>
* used by a {@link RoomListenerMultiplexor}
* for all muc chat rooms on an <code>Connection</code>.
* Each time a muc chat room is added to/removed from an
* <code>Connection</code> the address and listener for that chat room
* are added to/removed from that <code>Connection</code>'s
* <code>RoomMultiplexListener</code>.
*
* @author Larry Kirschner
*/
private static class RoomMultiplexListener implements PacketListener {
private Map<String, PacketMultiplexListener> roomListenersByAddress =
new ConcurrentHashMap<String, PacketMultiplexListener>();
public void processPacket(Packet p) {
String from = p.getFrom();
if (from == null) {
return;
}
PacketMultiplexListener listener =
roomListenersByAddress.get(StringUtils.parseBareAddress(from).toLowerCase());
if (listener != null) {
listener.processPacket(p);
}
}
public void addRoom(String address, PacketMultiplexListener listener) {
if (address == null) {
return;
}
roomListenersByAddress.put(address.toLowerCase(), listener);
}
public void removeRoom(String address) {
if (address == null) {
return;
}
roomListenersByAddress.remove(address.toLowerCase());
}
}
}