diff options
Diffstat (limited to 'src/org/jivesoftware/smackx/muc/RoomListenerMultiplexor.java')
-rw-r--r-- | src/org/jivesoftware/smackx/muc/RoomListenerMultiplexor.java | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/src/org/jivesoftware/smackx/muc/RoomListenerMultiplexor.java b/src/org/jivesoftware/smackx/muc/RoomListenerMultiplexor.java new file mode 100644 index 0000000..6f8bf05 --- /dev/null +++ b/src/org/jivesoftware/smackx/muc/RoomListenerMultiplexor.java @@ -0,0 +1,227 @@ +/** + * $RCSfile$ + * $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()); + } + } +} |