mirror of
https://github.com/vanitasvitae/Smack.git
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49847ac1c6
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2511 b35dd754-fafc-0310-a699-88a17e54d16e
593 lines
No EOL
22 KiB
Java
593 lines
No EOL
22 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright 2003-2004 Jive Software.
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*
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack;
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import org.xmlpull.v1.*;
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import org.xmlpull.mxp1.MXParser;
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import java.util.*;
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import java.util.List;
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import org.jivesoftware.smack.packet.*;
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import org.jivesoftware.smack.packet.XMPPError;
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import org.jivesoftware.smack.filter.PacketFilter;
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import org.jivesoftware.smack.util.*;
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import org.jivesoftware.smack.provider.*;
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/**
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* Listens for XML traffic from the XMPP server and parses it into packet objects.
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* The packet reader also manages all packet listeners and collectors.<p>
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*
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* @see PacketCollector
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* @see PacketListener
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* @author Matt Tucker
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*/
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class PacketReader {
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private Thread readerThread;
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private Thread listenerThread;
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private XMPPConnection connection;
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private XmlPullParser parser;
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private boolean done = false;
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protected List collectors = new ArrayList();
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private List listeners = new ArrayList();
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protected List connectionListeners = new ArrayList();
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private String connectionID = null;
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private Object connectionIDLock = new Object();
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protected PacketReader(XMPPConnection connection) {
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this.connection = connection;
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readerThread = new Thread() {
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public void run() {
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parsePackets();
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}
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};
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readerThread.setName("Smack Packet Reader");
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readerThread.setDaemon(true);
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listenerThread = new Thread() {
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public void run() {
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try {
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processListeners();
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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};
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listenerThread.setName("Smack Listener Processor");
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listenerThread.setDaemon(true);
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try {
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parser = new MXParser();
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parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
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parser.setInput(connection.reader);
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}
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catch (XmlPullParserException xppe) {
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xppe.printStackTrace();
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}
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}
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/**
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* Creates a new packet collector for this reader. A packet filter determines
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* which packets will be accumulated by the collector.
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*
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* @param packetFilter the packet filter to use.
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* @return a new packet collector.
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*/
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public PacketCollector createPacketCollector(PacketFilter packetFilter) {
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PacketCollector packetCollector = new PacketCollector(this, packetFilter);
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return packetCollector;
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}
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/**
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* Registers a packet listener with this reader. A packet filter determines
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* which packets will be delivered to the listener.
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*
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* @param packetListener the packet listener to notify of new packets.
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* @param packetFilter the packet filter to use.
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*/
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public void addPacketListener(PacketListener packetListener, PacketFilter packetFilter) {
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ListenerWrapper wrapper = new ListenerWrapper(this, packetListener,
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packetFilter);
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synchronized (listeners) {
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listeners.add(wrapper);
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}
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}
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/**
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* Removes a packet listener.
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*
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* @param packetListener the packet listener to remove.
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*/
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public void removePacketListener(PacketListener packetListener) {
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synchronized (listeners) {
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for (int i=0; i<listeners.size(); i++) {
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ListenerWrapper wrapper = (ListenerWrapper)listeners.get(i);
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if (wrapper != null && wrapper.packetListener.equals(packetListener)) {
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listeners.set(i, null);
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}
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}
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}
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}
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/**
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* Starts the packet reader thread and returns once a connection to the server
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* has been established. A connection will be attempted for a maximum of five
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* seconds. An XMPPException will be thrown if the connection fails.
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*
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* @throws XMPPException if the server fails to send an opening stream back
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* for more than five seconds.
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*/
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public void startup() throws XMPPException {
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readerThread.start();
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listenerThread.start();
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// Wait for stream tag before returing. We'll wait a couple of seconds before
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// giving up and throwing an error.
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try {
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synchronized(connectionIDLock) {
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if (connectionID == null) {
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// A waiting thread may be woken up before the wait time or a notify
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// (although this is a rare thing). Therefore, we continue waiting
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// until either a connectionID has been set (and hence a notify was
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// made) or the total wait time has elapsed.
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long waitTime = SmackConfiguration.getPacketReplyTimeout();
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long start = System.currentTimeMillis();
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while (connectionID == null && !done) {
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if (waitTime <= 0) {
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break;
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}
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connectionIDLock.wait(waitTime);
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long now = System.currentTimeMillis();
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waitTime -= now - start;
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start = now;
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}
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}
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}
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}
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catch (InterruptedException ie) { }
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if (connectionID == null) {
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throw new XMPPException("Connection failed. No response from server.");
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}
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else {
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connection.connectionID = connectionID;
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}
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}
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/**
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* Shuts the packet reader down.
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*/
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public void shutdown() {
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// Notify connection listeners of the connection closing if done hasn't already been set.
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if (!done) {
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ArrayList listenersCopy;
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synchronized (connectionListeners) {
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// Make a copy since it's possible that a listener will be removed from the list
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listenersCopy = new ArrayList(connectionListeners);
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for (Iterator i=listenersCopy.iterator(); i.hasNext(); ) {
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ConnectionListener listener = (ConnectionListener)i.next();
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listener.connectionClosed();
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}
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}
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}
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done = true;
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}
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/**
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* Sends out a notification that there was an error with the connection
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* and closes the connection.
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*
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* @param e the exception that causes the connection close event.
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*/
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void notifyConnectionError(Exception e) {
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done = true;
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connection.close();
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// Print the stack trace to help catch the problem
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e.printStackTrace();
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// Notify connection listeners of the error.
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ArrayList listenersCopy;
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synchronized (connectionListeners) {
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// Make a copy since it's possible that a listener will be removed from the list
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listenersCopy = new ArrayList(connectionListeners);
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for (Iterator i=listenersCopy.iterator(); i.hasNext(); ) {
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ConnectionListener listener = (ConnectionListener)i.next();
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listener.connectionClosedOnError(e);
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}
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}
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}
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/**
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* Process listeners.
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*/
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private void processListeners() {
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boolean processedPacket = false;
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while (!done) {
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synchronized (listeners) {
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if (listeners.size() > 0) {
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for (int i=listeners.size()-1; i>=0; i--) {
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if (listeners.get(i) == null) {
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listeners.remove(i);
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}
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}
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}
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}
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processedPacket = false;
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int size = listeners.size();
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for (int i=0; i<size; i++) {
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ListenerWrapper wrapper = (ListenerWrapper)listeners.get(i);
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if (wrapper != null) {
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processedPacket = processedPacket || wrapper.notifyListener();
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}
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}
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if (!processedPacket) {
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try {
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Thread.sleep(100);
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}
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catch (InterruptedException ie) { }
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}
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}
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}
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/**
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* Parse top-level packets in order to process them further.
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*/
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private void parsePackets() {
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try {
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int eventType = parser.getEventType();
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do {
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if (eventType == XmlPullParser.START_TAG) {
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if (parser.getName().equals("message")) {
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processPacket(PacketParserUtils.parseMessage(parser));
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}
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else if (parser.getName().equals("iq")) {
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processPacket(parseIQ(parser));
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}
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else if (parser.getName().equals("presence")) {
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processPacket(PacketParserUtils.parsePresence(parser));
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}
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// We found an opening stream. Record information about it, then notify
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// the connectionID lock so that the packet reader startup can finish.
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else if (parser.getName().equals("stream")) {
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// Ensure the correct jabber:client namespace is being used.
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if ("jabber:client".equals(parser.getNamespace(null))) {
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// Get the connection id.
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for (int i=0; i<parser.getAttributeCount(); i++) {
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if (parser.getAttributeName(i).equals("id")) {
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// Save the connectionID and notify that we've gotten it.
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synchronized(connectionIDLock) {
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connectionID = parser.getAttributeValue(i);
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connectionIDLock.notifyAll();
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}
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}
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else if (parser.getAttributeName(i).equals("from")) {
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// Use the server name that the server says that it is.
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connection.host = parser.getAttributeValue(i);
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}
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}
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}
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("stream")) {
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// Close the connection.
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connection.close();
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}
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}
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eventType = parser.next();
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} while (!done && eventType != XmlPullParser.END_DOCUMENT);
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}
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catch (Exception e) {
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if (!done) {
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// Close the connection and notify connection listeners of the
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// error.
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notifyConnectionError(e);
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}
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}
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}
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/**
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* Processes a packet after it's been fully parsed by looping through the installed
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* packet collectors and listeners and letting them examine the packet to see if
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* they are a match with the filter.
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*
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* @param packet the packet to process.
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*/
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private void processPacket(Packet packet) {
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if (packet == null) {
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return;
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}
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// Remove all null values from the collectors list.
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synchronized (collectors) {
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for (int i=collectors.size()-1; i>=0; i--) {
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if (collectors.get(i) == null) {
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collectors.remove(i);
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}
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}
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}
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// Loop through all collectors and notify the appropriate ones.
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int size = collectors.size();
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for (int i=0; i<size; i++) {
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PacketCollector collector = (PacketCollector)collectors.get(i);
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if (collector != null) {
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// Have the collector process the packet to see if it wants to handle it.
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collector.processPacket(packet);
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}
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}
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}
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/**
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* Parses an IQ packet.
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*
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* @param parser the XML parser, positioned at the start of an IQ packet.
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* @return an IQ object.
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* @throws Exception if an exception occurs while parsing the packet.
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*/
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private IQ parseIQ(XmlPullParser parser) throws Exception {
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IQ iqPacket = null;
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String id = parser.getAttributeValue("", "id");
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String to = parser.getAttributeValue("", "to");
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String from = parser.getAttributeValue("", "from");
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IQ.Type type = IQ.Type.fromString(parser.getAttributeValue("", "type"));
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XMPPError error = null;
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boolean done = false;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String elementName = parser.getName();
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String namespace = parser.getNamespace();
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if (elementName.equals("error")) {
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error = PacketParserUtils.parseError(parser);
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}
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else if (elementName.equals("query") && namespace.equals("jabber:iq:auth")) {
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iqPacket = parseAuthentication(parser);
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}
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else if (elementName.equals("query") && namespace.equals("jabber:iq:roster")) {
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iqPacket = parseRoster(parser);
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}
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else if (elementName.equals("query") && namespace.equals("jabber:iq:register")) {
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iqPacket = parseRegistration(parser);
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}
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// Otherwise, see if there is a registered provider for
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// this element name and namespace.
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else {
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Object provider = ProviderManager.getIQProvider(elementName, namespace);
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if (provider != null) {
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if (provider instanceof IQProvider) {
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iqPacket = ((IQProvider)provider).parseIQ(parser);
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}
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else if (provider instanceof Class) {
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iqPacket = (IQ)PacketParserUtils.parseWithIntrospection(elementName,
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(Class)provider, parser);
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}
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}
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("iq")) {
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done = true;
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}
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}
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}
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// Decide what to do when an IQ packet was not understood
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if (iqPacket == null) {
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if (IQ.Type.GET == type || IQ.Type.SET == type ) {
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// If the IQ stanza is of type "get" or "set" containing a child element
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// qualified by a namespace it does not understand, then answer an IQ of
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// type "error" with code 501 ("feature-not-implemented")
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iqPacket = new IQ() {
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public String getChildElementXML() {
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return null;
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}
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};
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iqPacket.setPacketID(id);
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iqPacket.setTo(from);
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iqPacket.setFrom(to);
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iqPacket.setType(IQ.Type.ERROR);
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iqPacket.setError(new XMPPError(501, "feature-not-implemented"));
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connection.sendPacket(iqPacket);
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return null;
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}
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else {
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// If an IQ packet wasn't created above, create an empty IQ packet.
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iqPacket = new IQ() {
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public String getChildElementXML() {
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return null;
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}
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};
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}
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}
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// Set basic values on the iq packet.
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iqPacket.setPacketID(id);
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iqPacket.setTo(to);
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iqPacket.setFrom(from);
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iqPacket.setType(type);
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iqPacket.setError(error);
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return iqPacket;
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}
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private Authentication parseAuthentication(XmlPullParser parser) throws Exception {
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Authentication authentication = new Authentication();
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boolean done = false;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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if (parser.getName().equals("username")) {
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authentication.setUsername(parser.nextText());
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}
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else if (parser.getName().equals("password")) {
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authentication.setPassword(parser.nextText());
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}
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else if (parser.getName().equals("digest")) {
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authentication.setDigest(parser.nextText());
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}
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else if (parser.getName().equals("resource")) {
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authentication.setResource(parser.nextText());
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("query")) {
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done = true;
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}
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}
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}
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return authentication;
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}
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private RosterPacket parseRoster(XmlPullParser parser) throws Exception {
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RosterPacket roster = new RosterPacket();
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boolean done = false;
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RosterPacket.Item item = null;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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if (parser.getName().equals("item")) {
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String jid = parser.getAttributeValue("", "jid");
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String name = parser.getAttributeValue("", "name");
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// Create packet.
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item = new RosterPacket.Item(jid, name);
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// Set status.
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String ask = parser.getAttributeValue("", "ask");
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RosterPacket.ItemStatus status = RosterPacket.ItemStatus.fromString(ask);
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item.setItemStatus(status);
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// Set type.
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String subscription = parser.getAttributeValue("", "subscription");
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RosterPacket.ItemType type = RosterPacket.ItemType.fromString(subscription);
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item.setItemType(type);
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}
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if (parser.getName().equals("group")) {
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String groupName = parser.nextText();
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item.addGroupName(groupName);
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("item")) {
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roster.addRosterItem(item);
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}
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if (parser.getName().equals("query")) {
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done = true;
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}
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}
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}
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return roster;
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}
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private Registration parseRegistration(XmlPullParser parser) throws Exception {
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Registration registration = new Registration();
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Map fields = null;
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boolean done = false;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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// Any element that's in the jabber:iq:register namespace,
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// attempt to parse it if it's in the form <name>value</name>.
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if (parser.getNamespace().equals("jabber:iq:register")) {
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String name = parser.getName();
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String value = "";
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if (fields == null) {
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fields = new HashMap();
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}
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if (parser.next() == XmlPullParser.TEXT) {
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value = parser.getText();
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}
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// Ignore instructions, but anything else should be added to the map.
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if (!name.equals("instructions")) {
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fields.put(name, value);
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}
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else {
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registration.setInstructions(value);
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}
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}
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// Otherwise, it must be a packet extension.
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else {
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registration.addExtension(
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PacketParserUtils.parsePacketExtension(
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parser.getName(),
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parser.getNamespace(),
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parser));
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("query")) {
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done = true;
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}
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}
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}
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registration.setAttributes(fields);
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return registration;
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}
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/**
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* A wrapper class to associate a packet collector with a listener.
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*/
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private static class ListenerWrapper {
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private PacketListener packetListener;
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private PacketCollector packetCollector;
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public ListenerWrapper(PacketReader packetReader, PacketListener packetListener,
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PacketFilter packetFilter)
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{
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this.packetListener = packetListener;
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this.packetCollector = new PacketCollector(packetReader, packetFilter);
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}
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public boolean equals(Object object) {
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if (object == null) {
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return false;
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}
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if (object instanceof ListenerWrapper) {
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return ((ListenerWrapper)object).packetListener.equals(this.packetListener);
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}
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else if (object instanceof PacketListener) {
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return object.equals(this.packetListener);
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}
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return false;
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}
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public boolean notifyListener() {
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Packet packet = packetCollector.pollResult();
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if (packet != null) {
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packetListener.processPacket(packet);
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return true;
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}
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else {
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return false;
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}
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}
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public void cancel() {
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packetCollector.cancel();
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packetCollector = null;
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packetListener = null;
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}
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}
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} |