| /** |
| * $RCSfile$ |
| * $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()); |
| } |
| } |
| } |