Java tutorial
/** * $RCSfile: $ * $Revision: $ * $Date: $ * * Copyright (C) 2005-2008 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.openfire.multiplex; import org.dom4j.Element; import org.jivesoftware.openfire.OfflineMessageStrategy; import org.jivesoftware.openfire.PacketDeliverer; import org.jivesoftware.openfire.PacketException; import org.jivesoftware.openfire.XMPPServer; import org.jivesoftware.openfire.auth.UnauthorizedException; import org.jivesoftware.openfire.session.ConnectionMultiplexerSession; import org.jivesoftware.util.LocaleUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.xmpp.packet.IQ; import org.xmpp.packet.Message; import org.xmpp.packet.Packet; import org.xmpp.packet.Presence; /** * Fallback method used by {@link org.jivesoftware.openfire.net.SocketConnection} when * connected to a connection manager. The fallback method will be used when a SocketConnection * fails to send a {@link Packet} (probably because the socket was closed).<p> * * The first attempt will be to send the packet using another connection to the same connection * manager (since managers may have a pool of connections to the server). And if that fails then * instances of {@link Message} may be stored offline for later retrieval. Since packets may be * wrapped by special IQ packets (read the Connection Manager JEP for more information) we need * to unwrap the packet and store the wrapped packet offline. * * @author Gaston Dombiak */ public class MultiplexerPacketDeliverer implements PacketDeliverer { private static final Logger Log = LoggerFactory.getLogger(MultiplexerPacketDeliverer.class); private OfflineMessageStrategy messageStrategy; private String connectionManagerDomain; private ConnectionMultiplexerManager multiplexerManager; public MultiplexerPacketDeliverer() { this.messageStrategy = XMPPServer.getInstance().getOfflineMessageStrategy(); multiplexerManager = ConnectionMultiplexerManager.getInstance(); } public void setConnectionManagerDomain(String connectionManagerDomain) { this.connectionManagerDomain = connectionManagerDomain; } public void deliver(Packet packet) throws UnauthorizedException, PacketException { // Check if we can send the packet using another session if (connectionManagerDomain == null) { // Packet deliverer has not yet been configured so handle unprocessed packet handleUnprocessedPacket(packet); } else { // Try getting another session to the same connection manager ConnectionMultiplexerSession session = multiplexerManager .getMultiplexerSession(connectionManagerDomain); if (session == null || session.isClosed()) { // No other session was found so handle unprocessed packet handleUnprocessedPacket(packet); } else { // Send the packet using this other session to the same connection manager session.process(packet); } } } private void handleUnprocessedPacket(Packet packet) { if (packet instanceof Message) { messageStrategy.storeOffline((Message) packet); } else if (packet instanceof Presence) { // presence packets are dropped silently //dropPacket(packet); } else if (packet instanceof IQ) { IQ iq = (IQ) packet; // Check if we need to unwrap the packet Element child = iq.getChildElement(); if (child != null && "session".equals(child.getName()) && "http://jabber.org/protocol/connectionmanager".equals(child.getNamespacePrefix())) { Element send = child.element("send"); if (send != null) { // Unwrap packet Element wrappedElement = (Element) send.elements().get(0); if ("message".equals(wrappedElement.getName())) { handleUnprocessedPacket(new Message(wrappedElement)); } } } else { // IQ packets are logged but dropped Log.warn(LocaleUtils.getLocalizedString("admin.error.routing") + "\n" + packet.toString()); } } } }