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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@6128 b35dd754-fafc-0310-a699-88a17e54d16e
953 lines
No EOL
37 KiB
Java
953 lines
No EOL
37 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.jivesoftware.smack.filter.PacketFilter;
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import org.jivesoftware.smack.packet.*;
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import org.jivesoftware.smack.provider.IQProvider;
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import org.jivesoftware.smack.provider.ProviderManager;
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import org.jivesoftware.smack.util.PacketParserUtils;
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import org.xmlpull.mxp1.MXParser;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import java.io.IOException;
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import java.util.*;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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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;
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private final VolatileMemberCollection<PacketCollector> collectors =
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new VolatileMemberCollection<PacketCollector>(50);
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protected final VolatileMemberCollection listeners = new VolatileMemberCollection(50);
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protected final List<ConnectionListener> connectionListeners =
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new ArrayList<ConnectionListener>();
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private String connectionID = null;
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private Semaphore connectionSemaphore;
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protected PacketReader(XMPPConnection connection) {
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this.connection = connection;
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this.init();
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}
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/**
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* Initializes the reader in order to be used. The reader is initialized during the
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* first connection and when reconnecting due to an abruptly disconnection.
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*/
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protected void init() {
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done = false;
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connectionID = null;
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readerThread = new Thread() {
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public void run() {
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parsePackets(this);
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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(this);
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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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resetParser();
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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 collector = new PacketCollector(this, packetFilter);
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collectors.add(collector);
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// Add the collector to the list of active collector.
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return collector;
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}
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protected void cancelPacketCollector(PacketCollector packetCollector) {
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collectors.remove(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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listeners.remove(packetListener);
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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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connectionSemaphore = new Semaphore(1);
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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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connectionSemaphore.acquire();
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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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int waitTime = SmackConfiguration.getPacketReplyTimeout();
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connectionSemaphore.tryAcquire(3 * waitTime, TimeUnit.MILLISECONDS);
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}
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catch (InterruptedException ie) {
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// Ignore.
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}
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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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List<ConnectionListener> 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<ConnectionListener>(connectionListeners);
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for (ConnectionListener listener : listenersCopy) {
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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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// Make sure that the listenerThread is awake to shutdown properly
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synchronized (listenerThread) {
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listenerThread.notify();
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}
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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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// Closes the connection temporary. A reconnection is possible
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connection.shutdown();
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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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List<ConnectionListener> 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<ConnectionListener>(connectionListeners);
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for (ConnectionListener listener : listenersCopy) {
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listener.connectionClosedOnError(e);
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}
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}
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// Make sure that the listenerThread is awake to shutdown properly
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synchronized (listenerThread) {
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listenerThread.notify();
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}
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}
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/**
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* Sends a notification indicating that the connection was reconnected successfully.
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*/
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protected void notifyReconnection() {
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// Notify connection listeners of the reconnection.
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List<ConnectionListener> 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<ConnectionListener>(connectionListeners);
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for (ConnectionListener listener : listenersCopy) {
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listener.reconnectionSuccessful();
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}
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}
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// Make sure that the listenerThread is awake to shutdown properly
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synchronized (listenerThread) {
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listenerThread.notify();
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}
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}
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/**
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* Resets the parser using the latest connection's reader. Reseting the parser is necessary
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* when the plain connection has been secured or when a new opening stream element is going
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* to be sent by the server.
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*/
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private void resetParser() {
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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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* Process listeners.
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*
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* @param thread the thread that is being used by the reader to process incoming packets.
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*/
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private void processListeners(Thread thread) {
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while (!done && thread == listenerThread) {
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boolean processedPacket = false;
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Iterator it = listeners.getIterator();
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while (it.hasNext()) {
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ListenerWrapper wrapper = (ListenerWrapper) it.next();
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processedPacket = processedPacket || wrapper.notifyListener();
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}
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if (!processedPacket) {
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try {
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// Wait until more packets are ready to be processed.
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synchronized (listenerThread) {
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listenerThread.wait();
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}
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}
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catch (InterruptedException ie) {
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// Ignore.
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}
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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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* @param thread the thread that is being used by the reader to parse incoming packets.
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*/
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private void parsePackets(Thread thread) {
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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
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connectionID = parser.getAttributeValue(i);
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if (!"1.0".equals(parser.getAttributeValue("", "version"))) {
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// Notify that a stream has been opened if the
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// server is not XMPP 1.0 compliant otherwise make the
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// notification after TLS has been negotiated or if TLS
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// is not supported
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releaseConnectionIDLock();
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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.serviceName = parser.getAttributeValue(i);
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}
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}
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}
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}
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else if (parser.getName().equals("error")) {
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throw new XMPPException(parseStreamError(parser));
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}
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else if (parser.getName().equals("features")) {
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parseFeatures(parser);
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}
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else if (parser.getName().equals("proceed")) {
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// Secure the connection by negotiating TLS
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connection.proceedTLSReceived();
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// Reset the state of the parser since a new stream element is going
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// to be sent by the server
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resetParser();
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}
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else if (parser.getName().equals("failure")) {
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String namespace = parser.getNamespace(null);
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if ("urn:ietf:params:xml:ns:xmpp-tls".equals(namespace)) {
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// TLS negotiation has failed. The server will close the connection
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throw new Exception("TLS negotiation has failed");
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}
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else if ("http://jabber.org/protocol/compress".equals(namespace)) {
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// Stream compression has been denied. This is a recoverable
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// situation. It is still possible to authenticate and
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// use the connection but using an uncompressed connection
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connection.streamCompressionDenied();
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}
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else {
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// SASL authentication has failed. The server may close the connection
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// depending on the number of retries
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connection.getSASLAuthentication().authenticationFailed();
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}
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}
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else if (parser.getName().equals("challenge")) {
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// The server is challenging the SASL authentication made by the client
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connection.getSASLAuthentication().challengeReceived(parser.nextText());
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}
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else if (parser.getName().equals("success")) {
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// We now need to bind a resource for the connection
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// Open a new stream and wait for the response
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connection.packetWriter.openStream();
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// Reset the state of the parser since a new stream element is going
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// to be sent by the server
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resetParser();
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// The SASL authentication with the server was successful. The next step
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// will be to bind the resource
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connection.getSASLAuthentication().authenticated();
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}
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else if (parser.getName().equals("compressed")) {
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// Server confirmed that it's possible to use stream compression. Start
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// stream compression
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connection.startStreamCompression();
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// Reset the state of the parser since a new stream element is going
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// to be sent by the server
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resetParser();
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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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// Disconnect the connection
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connection.disconnect();
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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 && thread == readerThread);
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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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* Releases the connection ID lock so that the thread that was waiting can resume. The
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* lock will be released when one of the following three conditions is met:<p>
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*
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* 1) An opening stream was sent from a non XMPP 1.0 compliant server
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* 2) Stream features were received from an XMPP 1.0 compliant server that does not support TLS
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* 3) TLS negotiation was successful
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*
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*/
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private void releaseConnectionIDLock() {
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connectionSemaphore.release();
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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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// Loop through all collectors and notify the appropriate ones.
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Iterator it = collectors.getIterator();
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while (it.hasNext()) {
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PacketCollector collector = (PacketCollector) it.next();
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collector.processPacket(packet);
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}
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// Notify the listener thread that packets are waiting.
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synchronized (listenerThread) {
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listenerThread.notifyAll();
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}
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}
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private StreamError parseStreamError(XmlPullParser parser) throws IOException,
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XmlPullParserException {
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StreamError streamError = 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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streamError = new StreamError(parser.getName());
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("error")) {
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done = true;
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}
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}
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}
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return streamError;
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}
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private void parseFeatures(XmlPullParser parser) throws Exception {
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boolean startTLSReceived = false;
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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("starttls")) {
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startTLSReceived = true;
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// Confirm the server that we want to use TLS
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connection.startTLSReceived();
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}
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else if (parser.getName().equals("mechanisms")) {
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// The server is reporting available SASL mechanisms. Store this information
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// which will be used later while logging (i.e. authenticating) into
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// the server
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connection.getSASLAuthentication()
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.setAvailableSASLMethods(parseMechanisms(parser));
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}
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else if (parser.getName().equals("bind")) {
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// The server requires the client to bind a resource to the stream
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connection.getSASLAuthentication().bindingRequired();
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}
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else if (parser.getName().equals("session")) {
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// The server supports sessions
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connection.getSASLAuthentication().sessionsSupported();
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}
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else if (parser.getName().equals("compression")) {
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// The server supports stream compression
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connection.setAvailableCompressionMethods(parseCompressionMethods(parser));
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}
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else if (parser.getName().equals("register")) {
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connection.getAccountManager().setSupportsAccountCreation(true);
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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("features")) {
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done = true;
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}
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}
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}
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// Release the lock after TLS has been negotiated or we are not insterested in TLS
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if (!startTLSReceived || !connection.getConfiguration().isTLSEnabled()) {
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releaseConnectionIDLock();
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}
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}
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/**
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* Returns a collection of Stings with the mechanisms included in the mechanisms stanza.
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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 a collection of Stings with the mechanisms included in the mechanisms stanza.
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* @throws Exception if an exception occurs while parsing the stanza.
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*/
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private Collection<String> parseMechanisms(XmlPullParser parser) throws Exception {
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List<String> mechanisms = new ArrayList<String>();
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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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if (elementName.equals("mechanism")) {
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mechanisms.add(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("mechanisms")) {
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done = true;
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}
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}
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}
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return mechanisms;
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}
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private Collection<String> parseCompressionMethods(XmlPullParser parser)
|
|
throws IOException, XmlPullParserException {
|
|
List<String> methods = new ArrayList<String>();
|
|
boolean done = false;
|
|
while (!done) {
|
|
int eventType = parser.next();
|
|
|
|
if (eventType == XmlPullParser.START_TAG) {
|
|
String elementName = parser.getName();
|
|
if (elementName.equals("method")) {
|
|
methods.add(parser.nextText());
|
|
}
|
|
}
|
|
else if (eventType == XmlPullParser.END_TAG) {
|
|
if (parser.getName().equals("compression")) {
|
|
done = true;
|
|
}
|
|
}
|
|
}
|
|
return methods;
|
|
}
|
|
|
|
/**
|
|
* Parses an IQ packet.
|
|
*
|
|
* @param parser the XML parser, positioned at the start of an IQ packet.
|
|
* @return an IQ object.
|
|
* @throws Exception if an exception occurs while parsing the packet.
|
|
*/
|
|
private IQ parseIQ(XmlPullParser parser) throws Exception {
|
|
IQ iqPacket = null;
|
|
|
|
String id = parser.getAttributeValue("", "id");
|
|
String to = parser.getAttributeValue("", "to");
|
|
String from = parser.getAttributeValue("", "from");
|
|
IQ.Type type = IQ.Type.fromString(parser.getAttributeValue("", "type"));
|
|
XMPPError error = null;
|
|
|
|
boolean done = false;
|
|
while (!done) {
|
|
int eventType = parser.next();
|
|
|
|
if (eventType == XmlPullParser.START_TAG) {
|
|
String elementName = parser.getName();
|
|
String namespace = parser.getNamespace();
|
|
if (elementName.equals("error")) {
|
|
error = PacketParserUtils.parseError(parser);
|
|
}
|
|
else if (elementName.equals("query") && namespace.equals("jabber:iq:auth")) {
|
|
iqPacket = parseAuthentication(parser);
|
|
}
|
|
else if (elementName.equals("query") && namespace.equals("jabber:iq:roster")) {
|
|
iqPacket = parseRoster(parser);
|
|
}
|
|
else if (elementName.equals("query") && namespace.equals("jabber:iq:register")) {
|
|
iqPacket = parseRegistration(parser);
|
|
}
|
|
else if (elementName.equals("bind") &&
|
|
namespace.equals("urn:ietf:params:xml:ns:xmpp-bind")) {
|
|
iqPacket = parseResourceBinding(parser);
|
|
}
|
|
// Otherwise, see if there is a registered provider for
|
|
// this element name and namespace.
|
|
else {
|
|
Object provider = ProviderManager.getInstance().getIQProvider(elementName, namespace);
|
|
if (provider != null) {
|
|
if (provider instanceof IQProvider) {
|
|
iqPacket = ((IQProvider)provider).parseIQ(parser);
|
|
}
|
|
else if (provider instanceof Class) {
|
|
iqPacket = (IQ)PacketParserUtils.parseWithIntrospection(elementName,
|
|
(Class)provider, parser);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (eventType == XmlPullParser.END_TAG) {
|
|
if (parser.getName().equals("iq")) {
|
|
done = true;
|
|
}
|
|
}
|
|
}
|
|
// Decide what to do when an IQ packet was not understood
|
|
if (iqPacket == null) {
|
|
if (IQ.Type.GET == type || IQ.Type.SET == type ) {
|
|
// If the IQ stanza is of type "get" or "set" containing a child element
|
|
// qualified by a namespace it does not understand, then answer an IQ of
|
|
// type "error" with code 501 ("feature-not-implemented")
|
|
iqPacket = new IQ() {
|
|
public String getChildElementXML() {
|
|
return null;
|
|
}
|
|
};
|
|
iqPacket.setPacketID(id);
|
|
iqPacket.setTo(from);
|
|
iqPacket.setFrom(to);
|
|
iqPacket.setType(IQ.Type.ERROR);
|
|
iqPacket.setError(new XMPPError(XMPPError.Condition.feature_not_implemented));
|
|
connection.sendPacket(iqPacket);
|
|
return null;
|
|
}
|
|
else {
|
|
// If an IQ packet wasn't created above, create an empty IQ packet.
|
|
iqPacket = new IQ() {
|
|
public String getChildElementXML() {
|
|
return null;
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
// Set basic values on the iq packet.
|
|
iqPacket.setPacketID(id);
|
|
iqPacket.setTo(to);
|
|
iqPacket.setFrom(from);
|
|
iqPacket.setType(type);
|
|
iqPacket.setError(error);
|
|
|
|
return iqPacket;
|
|
}
|
|
|
|
private Authentication parseAuthentication(XmlPullParser parser) throws Exception {
|
|
Authentication authentication = new Authentication();
|
|
boolean done = false;
|
|
while (!done) {
|
|
int eventType = parser.next();
|
|
if (eventType == XmlPullParser.START_TAG) {
|
|
if (parser.getName().equals("username")) {
|
|
authentication.setUsername(parser.nextText());
|
|
}
|
|
else if (parser.getName().equals("password")) {
|
|
authentication.setPassword(parser.nextText());
|
|
}
|
|
else if (parser.getName().equals("digest")) {
|
|
authentication.setDigest(parser.nextText());
|
|
}
|
|
else if (parser.getName().equals("resource")) {
|
|
authentication.setResource(parser.nextText());
|
|
}
|
|
}
|
|
else if (eventType == XmlPullParser.END_TAG) {
|
|
if (parser.getName().equals("query")) {
|
|
done = true;
|
|
}
|
|
}
|
|
}
|
|
return authentication;
|
|
}
|
|
|
|
private RosterPacket parseRoster(XmlPullParser parser) throws Exception {
|
|
RosterPacket roster = new RosterPacket();
|
|
boolean done = false;
|
|
RosterPacket.Item item = null;
|
|
while (!done) {
|
|
int eventType = parser.next();
|
|
if (eventType == XmlPullParser.START_TAG) {
|
|
if (parser.getName().equals("item")) {
|
|
String jid = parser.getAttributeValue("", "jid");
|
|
String name = parser.getAttributeValue("", "name");
|
|
// Create packet.
|
|
item = new RosterPacket.Item(jid, name);
|
|
// Set status.
|
|
String ask = parser.getAttributeValue("", "ask");
|
|
RosterPacket.ItemStatus status = RosterPacket.ItemStatus.fromString(ask);
|
|
item.setItemStatus(status);
|
|
// Set type.
|
|
String subscription = parser.getAttributeValue("", "subscription");
|
|
RosterPacket.ItemType type = RosterPacket.ItemType.fromString(subscription);
|
|
item.setItemType(type);
|
|
}
|
|
if (parser.getName().equals("group") && item!= null) {
|
|
item.addGroupName(parser.nextText());
|
|
}
|
|
}
|
|
else if (eventType == XmlPullParser.END_TAG) {
|
|
if (parser.getName().equals("item")) {
|
|
roster.addRosterItem(item);
|
|
}
|
|
if (parser.getName().equals("query")) {
|
|
done = true;
|
|
}
|
|
}
|
|
}
|
|
return roster;
|
|
}
|
|
|
|
private Registration parseRegistration(XmlPullParser parser) throws Exception {
|
|
Registration registration = new Registration();
|
|
Map<String, String> fields = null;
|
|
boolean done = false;
|
|
while (!done) {
|
|
int eventType = parser.next();
|
|
if (eventType == XmlPullParser.START_TAG) {
|
|
// Any element that's in the jabber:iq:register namespace,
|
|
// attempt to parse it if it's in the form <name>value</name>.
|
|
if (parser.getNamespace().equals("jabber:iq:register")) {
|
|
String name = parser.getName();
|
|
String value = "";
|
|
if (fields == null) {
|
|
fields = new HashMap<String, String>();
|
|
}
|
|
|
|
if (parser.next() == XmlPullParser.TEXT) {
|
|
value = parser.getText();
|
|
}
|
|
// Ignore instructions, but anything else should be added to the map.
|
|
if (!name.equals("instructions")) {
|
|
fields.put(name, value);
|
|
}
|
|
else {
|
|
registration.setInstructions(value);
|
|
}
|
|
}
|
|
// Otherwise, it must be a packet extension.
|
|
else {
|
|
registration.addExtension(
|
|
PacketParserUtils.parsePacketExtension(
|
|
parser.getName(),
|
|
parser.getNamespace(),
|
|
parser));
|
|
}
|
|
}
|
|
else if (eventType == XmlPullParser.END_TAG) {
|
|
if (parser.getName().equals("query")) {
|
|
done = true;
|
|
}
|
|
}
|
|
}
|
|
registration.setAttributes(fields);
|
|
return registration;
|
|
}
|
|
|
|
private Bind parseResourceBinding(XmlPullParser parser) throws IOException,
|
|
XmlPullParserException {
|
|
Bind bind = new Bind();
|
|
boolean done = false;
|
|
while (!done) {
|
|
int eventType = parser.next();
|
|
if (eventType == XmlPullParser.START_TAG) {
|
|
if (parser.getName().equals("resource")) {
|
|
bind.setResource(parser.nextText());
|
|
}
|
|
else if (parser.getName().equals("jid")) {
|
|
bind.setJid(parser.nextText());
|
|
}
|
|
} else if (eventType == XmlPullParser.END_TAG) {
|
|
if (parser.getName().equals("bind")) {
|
|
done = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return bind;
|
|
}
|
|
|
|
/**
|
|
* When an object is added it the first attempt is to add it to a 'null' space and when it is
|
|
* removed it is not removed from the list but instead the position is nulled so as not to
|
|
* interfere with list iteration as the Collection memebres are thought to be extermely
|
|
* volatile. In other words, many are added and deleted and 'null' values are skipped by the
|
|
* returned iterator.
|
|
*/
|
|
static class VolatileMemberCollection<E> {
|
|
|
|
private final Object mutex = new Object();
|
|
private final ArrayList<E> collectors;
|
|
private int nullIndex = -1;
|
|
private int[] nullArray;
|
|
|
|
VolatileMemberCollection(int initialCapacity) {
|
|
collectors = new ArrayList<E>(initialCapacity);
|
|
nullArray = new int[initialCapacity];
|
|
}
|
|
|
|
public void add(E member) {
|
|
synchronized (mutex) {
|
|
if (nullIndex < 0) {
|
|
ensureCapacity();
|
|
collectors.add(member);
|
|
}
|
|
else {
|
|
collectors.set(nullArray[nullIndex--], member);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void ensureCapacity() {
|
|
int current = nullArray.length;
|
|
if (collectors.size() + 1 >= current) {
|
|
int newCapacity = current * 2;
|
|
int oldData[] = nullArray;
|
|
|
|
collectors.ensureCapacity(newCapacity);
|
|
nullArray = new int[newCapacity];
|
|
System.arraycopy(oldData, 0, nullArray, 0, nullIndex + 1);
|
|
}
|
|
}
|
|
|
|
public void remove(E member) {
|
|
synchronized (mutex) {
|
|
for (int i = collectors.size()-1; i >= 0; i--) {
|
|
E element = collectors.get(i);
|
|
if (element != null && element.equals(member)) {
|
|
collectors.set(i, null);
|
|
nullArray[++nullIndex] = i;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* One thread should be using an iterator at a time.
|
|
*
|
|
* @return Iterator over PacketCollector.
|
|
*/
|
|
public Iterator getIterator() {
|
|
return new Iterator() {
|
|
private int index = 0;
|
|
private Object next;
|
|
private int size = collectors.size();
|
|
|
|
public void remove() {
|
|
}
|
|
|
|
public boolean hasNext() {
|
|
return next != null || grabNext() != null;
|
|
}
|
|
|
|
private Object grabNext() {
|
|
Object next;
|
|
while (index < size) {
|
|
next = collectors.get(index++);
|
|
if (next != null) {
|
|
this.next = next;
|
|
return next;
|
|
}
|
|
}
|
|
this.next = null;
|
|
return null;
|
|
}
|
|
|
|
public Object next() {
|
|
Object toReturn = (this.next != null ? this.next : grabNext());
|
|
this.next = null;
|
|
return toReturn;
|
|
}
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Returns the number of elements in this collection.
|
|
*
|
|
* @return the number of elements in this collection
|
|
*/
|
|
public int size() {
|
|
int size = 0;
|
|
for (E element : collectors) {
|
|
if (element != null) {
|
|
size++;
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A wrapper class to associate a packet collector with a listener.
|
|
*/
|
|
protected static class ListenerWrapper {
|
|
|
|
private PacketListener packetListener;
|
|
private PacketCollector packetCollector;
|
|
|
|
public ListenerWrapper(PacketReader packetReader, PacketListener packetListener,
|
|
PacketFilter packetFilter)
|
|
{
|
|
this.packetListener = packetListener;
|
|
this.packetCollector = packetReader.createPacketCollector(packetFilter);
|
|
}
|
|
|
|
public boolean equals(Object object) {
|
|
if (object == null) {
|
|
return false;
|
|
}
|
|
if (object instanceof ListenerWrapper) {
|
|
return ((ListenerWrapper)object).packetListener.equals(this.packetListener);
|
|
}
|
|
else if (object instanceof PacketListener) {
|
|
return object.equals(this.packetListener);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public boolean notifyListener() {
|
|
Packet packet = packetCollector.pollResult();
|
|
if (packet != null) {
|
|
packetListener.processPacket(packet);
|
|
return true;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
public void cancel() {
|
|
packetCollector.cancel();
|
|
packetCollector = null;
|
|
packetListener = null;
|
|
}
|
|
}
|
|
} |