* // Create a connection to the jivesoftware.com XMPP server.
* XMPPConnection con = new XMPPConnection("jivesoftware.com");
* // Most servers require you to login before performing other tasks.
* con.login("jsmith", "mypass");
* // Start a new conversation with John Doe and send him a message.
* Chat chat = con.createChat("jdoe@jabber.org");
* chat.sendMessage("Hey, how's it going?");
*
*
* @author Matt Tucker
*/
public class XMPPConnection {
/**
* Value that indicates whether debugging is enabled. When enabled, a debug
* window will apear for each new connection that will contain the following
* information:* * A custom SocketFactory allows fine-grained control of the actual connection to the * XMPP server. A typical use for a custom SocketFactory is when connecting through a * SOCKS proxy. * * @param host the host name, or null for the loopback address. * @param port the port on the server that should be used; e.g. 5222. * @param serviceName the name of the XMPP server to connect to; e.g. jivesoftware.com. * @param socketFactory a SocketFactory that will be used to create the socket to the XMPP * server. * @throws XMPPException if an error occurs while trying to establish the connection. * Two possible errors can occur which will be wrapped by an XMPPException -- * UnknownHostException (XMPP error code 504), and IOException (XMPP error code * 502). The error codes and wrapped exceptions can be used to present more * appropiate error messages to end-users. */ public XMPPConnection(String host, int port, String serviceName, SocketFactory socketFactory) throws XMPPException { // Create the configuration for this new connection ConnectionConfiguration config = new ConnectionConfiguration(host, port, serviceName); config.setTLSEnabled(true); config.setCompressionEnabled(false); config.setSASLAuthenticationEnabled(true); config.setDebuggerEnabled(DEBUG_ENABLED); // Set the new connection configuration connectUsingConfiguration(config, socketFactory); } public XMPPConnection(ConnectionConfiguration config) throws XMPPException { // Set the new connection configuration connectUsingConfiguration(config, null); } public XMPPConnection(ConnectionConfiguration config, SocketFactory socketFactory) throws XMPPException { // Set the new connection configuration connectUsingConfiguration(config, socketFactory); } private void connectUsingConfiguration(ConnectionConfiguration config, SocketFactory socketFactory) throws XMPPException { this.host = config.getHost(); this.port = config.getPort(); try { if (socketFactory == null) { this.socket = new Socket(host, port); } else { this.socket = socketFactory.createSocket(host, port); } } catch (UnknownHostException uhe) { throw new XMPPException( "Could not connect to " + host + ":" + port + ".", new XMPPError(504), uhe); } catch (IOException ioe) { throw new XMPPException( "XMPPError connecting to " + host + ":" + port + ".", new XMPPError(502), ioe); } this.serviceName = config.getServiceName(); try { // Keep a copy to be sure that once the configuration has been passed to the // constructor it cannot be modified this.configuration = (ConnectionConfiguration) config.clone(); } catch (CloneNotSupportedException e) {} init(); } /** * Package-private default constructor. This constructor is only intended * for unit testing. Normal classes extending XMPPConnection should override * one of the other constructors. */ XMPPConnection() { } /** * Returns the connection ID for this connection, which is the value set by the server * when opening a XMPP stream. If the server does not set a connection ID, this value * will be null. * * @return the ID of this connection returned from the XMPP server. */ public String getConnectionID() { return connectionID; } /** * Returns the name of the service provided by the XMPP server for this connection. After * authenticating with the server the returned value may be different. * * @return the name of the service provided by the XMPP server. */ public String getServiceName() { return serviceName; } /** * Returns the host name of the server where the XMPP server is running. This would be the * IP address of the server or a name that may be resolved by a DNS server. * * @return the host name of the server where the XMPP server is running. */ public String getHost() { return host; } /** * Returns the port number of the XMPP server for this connection. The default port * for normal connections is 5222. The default port for SSL connections is 5223. * * @return the port number of the XMPP server. */ public int getPort() { return port; } /** * Returns the full XMPP address of the user that is logged in to the connection or * null if not logged in yet. An XMPP address is in the form * username@server/resource. * * @return the full XMPP address of the user logged in. */ public String getUser() { if (!isAuthenticated()) { return null; } return user; } /** * Logs in to the server using the strongest authentication mode supported by * the server, then set our presence to available. If more than five seconds * (default timeout) elapses in each step of the authentication process without * a response from the server, or if an error occurs, a XMPPException will be thrown. * * @param username the username. * @param password the password. * @throws XMPPException if an error occurs. */ public void login(String username, String password) throws XMPPException { login(username, password, "Smack"); } /** * Logs in to the server using the strongest authentication mode supported by * the server, then sets presence to available. If more than five seconds * (default timeout) elapses in each step of the authentication process without * a response from the server, or if an error occurs, a XMPPException will be thrown. * * @param username the username. * @param password the password. * @param resource the resource. * @throws XMPPException if an error occurs. * @throws IllegalStateException if not connected to the server, or already logged in * to the serrver. */ public synchronized void login(String username, String password, String resource) throws XMPPException { login(username, password, resource, true); } /** * Logs in to the server using the strongest authentication mode supported by * the server. If the server supports SASL authentication then the user will be * authenticated using SASL if not Non-SASL authentication will be tried. An available * presence may optionally be sent. If sendPresence * is false, a presence packet must be sent manually later. If more than five seconds * (default timeout) elapses in each step of the authentication process without a * response from the server, or if an error occurs, a XMPPException will be thrown. * * @param username the username. * @param password the password. * @param resource the resource. * @param sendPresence if true an available presence will be sent automatically * after login is completed. * @throws XMPPException if an error occurs. * @throws IllegalStateException if not connected to the server, or already logged in * to the serrver. */ public synchronized void login(String username, String password, String resource, boolean sendPresence) throws XMPPException { if (!isConnected()) { throw new IllegalStateException("Not connected to server."); } if (authenticated) { throw new IllegalStateException("Already logged in to server."); } // Do partial version of nameprep on the username. username = username.toLowerCase().trim(); String response = null; if (configuration.isSASLAuthenticationEnabled() && saslAuthentication.hasNonAnonymousAuthentication()) { // Authenticate using SASL response = saslAuthentication.authenticate(username, password, resource); } else { // Authenticate using Non-SASL response = new NonSASLAuthentication(this).authenticate(username, password, resource); } // Set the user. if (response != null) { this.user = response; // Update the serviceName with the one returned by the server this.serviceName = StringUtils.parseServer(response); } else { this.user = username + "@" + this.serviceName; if (resource != null) { this.user += "/" + resource; } } // If compression is enabled then request the server to use stream compression if (configuration.isCompressionEnabled()) { useCompression(); } // Create the roster. this.roster = new Roster(this); roster.reload(); // Set presence to online. if (sendPresence) { packetWriter.sendPacket(new Presence(Presence.Type.AVAILABLE)); } // Indicate that we're now authenticated. authenticated = true; anonymous = false; // If debugging is enabled, change the the debug window title to include the // name we are now logged-in as. // If DEBUG_ENABLED was set to true AFTER the connection was created the debugger // will be null if (configuration.isDebuggerEnabled() && debugger != null) { debugger.userHasLogged(user); } } /** * Logs in to the server anonymously. Very few servers are configured to support anonymous * authentication, so it's fairly likely logging in anonymously will fail. If anonymous login * does succeed, your XMPP address will likely be in the form "server/123ABC" (where "123ABC" * is a random value generated by the server). * * @throws XMPPException if an error occurs or anonymous logins are not supported by the server. * @throws IllegalStateException if not connected to the server, or already logged in * to the serrver. */ public synchronized void loginAnonymously() throws XMPPException { if (!isConnected()) { throw new IllegalStateException("Not connected to server."); } if (authenticated) { throw new IllegalStateException("Already logged in to server."); } String response = null; if (configuration.isSASLAuthenticationEnabled() && saslAuthentication.hasAnonymousAuthentication()) { response = saslAuthentication.authenticateAnonymously(); } else { // Authenticate using Non-SASL response = new NonSASLAuthentication(this).authenticateAnonymously(); } // Set the user value. this.user = response; // Update the serviceName with the one returned by the server this.serviceName = StringUtils.parseServer(response); // If compression is enabled then request the server to use stream compression if (configuration.isCompressionEnabled()) { useCompression(); } // Anonymous users can't have a roster. roster = null; // Set presence to online. packetWriter.sendPacket(new Presence(Presence.Type.AVAILABLE)); // Indicate that we're now authenticated. authenticated = true; anonymous = true; // If debugging is enabled, change the the debug window title to include the // name we are now logged-in as. // If DEBUG_ENABLED was set to true AFTER the connection was created the debugger // will be null if (configuration.isDebuggerEnabled() && debugger != null) { debugger.userHasLogged(user); } } /** * Returns the roster for the user logged into the server. If the user has not yet * logged into the server (or if the user is logged in anonymously), this method will return * null. * * @return the user's roster, or null if the user has not logged in yet. */ public Roster getRoster() { if (roster == null) { return null; } // If this is the first time the user has asked for the roster after calling // login, we want to wait for the server to send back the user's roster. This // behavior shields API users from having to worry about the fact that roster // operations are asynchronous, although they'll still have to listen for // changes to the roster. Note: because of this waiting logic, internal // Smack code should be wary about calling the getRoster method, and may need to // access the roster object directly. if (!roster.rosterInitialized) { try { synchronized (roster) { long waitTime = SmackConfiguration.getPacketReplyTimeout(); long start = System.currentTimeMillis(); while (!roster.rosterInitialized) { if (waitTime <= 0) { break; } roster.wait(waitTime); long now = System.currentTimeMillis(); waitTime -= now - start; start = now; } } } catch (InterruptedException ie) { // Ignore. } } return roster; } /** * Returns an account manager instance for this connection. * * @return an account manager for this connection. */ public synchronized AccountManager getAccountManager() { if (accountManager == null) { accountManager = new AccountManager(this); } return accountManager; } /** * Creates a new chat with the specified participant. The participant should * be a valid XMPP user such as jdoe@jivesoftware.com or * jdoe@jivesoftware.com/work. * * @param participant the person to start the conversation with. * @return a new Chat object. */ public Chat createChat(String participant) { if (!isConnected()) { throw new IllegalStateException("Not connected to server."); } return new Chat(this, participant); } /** * Creates a new group chat connected to the specified room. The room name * should be full address, such as room@chat.example.com. *
* Most XMPP servers use a sub-domain for the chat service (eg chat.example.com
* for the XMPP server example.com). You must ensure that the room address you're
* trying to connect to includes the proper chat sub-domain.
*
* @param room the fully qualifed name of the room.
* @return a new GroupChat object.
*/
public GroupChat createGroupChat(String room) {
if (!isConnected()) {
throw new IllegalStateException("Not connected to server.");
}
return new GroupChat(this, room);
}
/**
* Returns true if currently connected to the XMPP server.
*
* @return true if connected.
*/
public boolean isConnected() {
return connected;
}
/**
* Returns true if the connection is a secured one, such as an SSL connection or
* if TLS was negotiated successfully.
*
* @return true if a secure connection to the server.
*/
public boolean isSecureConnection() {
return isUsingTLS();
}
/**
* Returns true if currently authenticated by successfully calling the login method.
*
* @return true if authenticated.
*/
public boolean isAuthenticated() {
return authenticated;
}
/**
* Returns true if currently authenticated anonymously.
*
* @return true if authenticated anonymously.
*/
public boolean isAnonymous() {
return anonymous;
}
/**
* Closes the connection by setting presence to unavailable then closing the stream to
* the XMPP server. Once a connection has been closed, it cannot be re-opened.
*/
public void close() {
// Set presence to offline.
packetWriter.sendPacket(new Presence(Presence.Type.UNAVAILABLE));
packetReader.shutdown();
packetWriter.shutdown();
// Wait 150 ms for processes to clean-up, then shutdown.
try {
Thread.sleep(150);
}
catch (Exception e) {
// Ignore.
}
// Close down the readers and writers.
if (reader != null)
{
try { reader.close(); } catch (Throwable ignore) { /* ignore */ }
reader = null;
}
if (writer != null)
{
try { writer.close(); } catch (Throwable ignore) { /* ignore */ }
writer = null;
}
try {
socket.close();
}
catch (Exception e) {
// Ignore.
}
authenticated = false;
connected = false;
}
/**
* Sends the specified packet to the server.
*
* @param packet the packet to send.
*/
public void sendPacket(Packet packet) {
if (!isConnected()) {
throw new IllegalStateException("Not connected to server.");
}
if (packet == null) {
throw new NullPointerException("Packet is null.");
}
packetWriter.sendPacket(packet);
}
/**
* Registers a packet listener with this connection. A packet filter determines
* which packets will be delivered to the listener.
*
* @param packetListener the packet listener to notify of new packets.
* @param packetFilter the packet filter to use.
*/
public void addPacketListener(PacketListener packetListener, PacketFilter packetFilter) {
if (!isConnected()) {
throw new IllegalStateException("Not connected to server.");
}
packetReader.addPacketListener(packetListener, packetFilter);
}
/**
* Removes a packet listener from this connection.
*
* @param packetListener the packet listener to remove.
*/
public void removePacketListener(PacketListener packetListener) {
packetReader.removePacketListener(packetListener);
}
/**
* Registers a packet listener with this connection. The listener will be
* notified of every packet that this connection sends. A packet filter determines
* which packets will be delivered to the listener. Note that the thread
* that writes packets will be used to invoke the listeners. Therefore, each
* packet listener should complete all operations quickly or use a different
* thread for processing.
*
* @param packetListener the packet listener to notify of sent packets.
* @param packetFilter the packet filter to use.
*/
public void addPacketWriterListener(PacketListener packetListener, PacketFilter packetFilter) {
if (!isConnected()) {
throw new IllegalStateException("Not connected to server.");
}
packetWriter.addPacketListener(packetListener, packetFilter);
}
/**
* Removes a packet listener from this connection.
*
* @param packetListener the packet listener to remove.
*/
public void removePacketWriterListener(PacketListener packetListener) {
packetWriter.removePacketListener(packetListener);
}
/**
* Registers a packet interceptor with this connection. The interceptor will be
* invoked every time a packet is about to be sent by this connection. Interceptors
* may modify the packet to be sent. A packet filter determines which packets
* will be delivered to the interceptor.
*
* @param packetInterceptor the packet interceptor to notify of packets about to be sent.
* @param packetFilter the packet filter to use.
*/
public void addPacketWriterInterceptor(PacketInterceptor packetInterceptor,
PacketFilter packetFilter) {
if (!isConnected()) {
throw new IllegalStateException("Not connected to server.");
}
packetWriter.addPacketInterceptor(packetInterceptor, packetFilter);
}
/**
* Removes a packet interceptor.
*
* @param packetInterceptor the packet interceptor to remove.
*/
public void removePacketWriterInterceptor(PacketInterceptor packetInterceptor) {
packetWriter.removePacketInterceptor(packetInterceptor);
}
/**
* Creates a new packet collector for this connection. A packet filter determines
* which packets will be accumulated by the collector.
*
* @param packetFilter the packet filter to use.
* @return a new packet collector.
*/
public PacketCollector createPacketCollector(PacketFilter packetFilter) {
return packetReader.createPacketCollector(packetFilter);
}
/**
* Adds a connection listener to this connection that will be notified when
* the connection closes or fails.
*
* @param connectionListener a connection listener.
*/
public void addConnectionListener(ConnectionListener connectionListener) {
if (connectionListener == null) {
return;
}
synchronized (packetReader.connectionListeners) {
if (!packetReader.connectionListeners.contains(connectionListener)) {
packetReader.connectionListeners.add(connectionListener);
}
}
}
/**
* Removes a connection listener from this connection.
*
* @param connectionListener a connection listener.
*/
public void removeConnectionListener(ConnectionListener connectionListener) {
synchronized (packetReader.connectionListeners) {
packetReader.connectionListeners.remove(connectionListener);
}
}
/**
* Adds a connection established listener that will be notified when a new connection
* is established.
*
* @param connectionEstablishedListener a listener interested on connection established events.
*/
public static void addConnectionListener(ConnectionEstablishedListener connectionEstablishedListener) {
synchronized (connectionEstablishedListeners) {
if (!connectionEstablishedListeners.contains(connectionEstablishedListener)) {
connectionEstablishedListeners.add(connectionEstablishedListener);
}
}
}
/**
* Removes a listener on new established connections.
*
* @param connectionEstablishedListener a listener interested on connection established events.
*/
public static void removeConnectionListener(ConnectionEstablishedListener connectionEstablishedListener) {
synchronized (connectionEstablishedListeners) {
connectionEstablishedListeners.remove(connectionEstablishedListener);
}
}
/**
* Initializes the connection by creating a packet reader and writer and opening a
* XMPP stream to the server.
*
* @throws XMPPException if establishing a connection to the server fails.
*/
private void init() throws XMPPException {
// Set the reader and writer instance variables
initReaderAndWriter();
try
{
packetWriter = new PacketWriter(this);
packetReader = new PacketReader(this);
// If debugging is enabled, we should start the thread that will listen for
// all packets and then log them.
if (configuration.isDebuggerEnabled()) {
packetReader.addPacketListener(debugger.getReaderListener(), null);
if (debugger.getWriterListener() != null) {
packetWriter.addPacketListener(debugger.getWriterListener(), null);
}
}
// Start the packet writer. This will open a XMPP stream to the server
packetWriter.startup();
// Start the packet reader. The startup() method will block until we
// get an opening stream packet back from server.
packetReader.startup();
// Make note of the fact that we're now connected.
connected = true;
// Notify that a new connection has been established
connectionEstablished(this);
// Add a listener for all message packets so that we can deliver errant
// messages to the best Chat instance available.
addPacketListener(new PacketListener() {
public void processPacket(Packet packet) {
Message message = (Message)packet;
// Ignore any messages with a thread ID, as they will likely
// already be associated with a Chat. This will miss messages
// with new thread ID values, but we can only assume that a
// listener is registered to deal with this case.
if (message.getThread() == null &&
message.getType() != Message.Type.GROUP_CHAT &&
message.getType() != Message.Type.HEADLINE) {
WeakReference chatRef = (WeakReference)chats.get(
StringUtils.parseBareAddress(message.getFrom()));
if (chatRef != null) {
// Do some extra clean-up if the reference was cleared.
Chat chat;
if ((chat = (Chat)chatRef.get()) == null) {
chats.remove(message.getFrom());
}
else {
chat.deliver(message);
}
}
}
}
}, new PacketTypeFilter(Message.class));
}
catch (XMPPException ex) {
// An exception occurred in setting up the connection. Make sure we shut down the
// readers and writers and close the socket.
if (packetWriter != null) {
try { packetWriter.shutdown(); } catch (Throwable ignore) { /* ignore */ }
packetWriter = null;
}
if (packetReader != null) {
try { packetReader.shutdown(); } catch (Throwable ignore) { /* ignore */ }
packetReader = null;
}
if (reader != null) {
try { reader.close(); } catch (Throwable ignore) { /* ignore */ }
reader = null;
}
if (writer != null) {
try { writer.close(); } catch (Throwable ignore) { /* ignore */}
writer = null;
}
if (socket != null) {
try { socket.close(); } catch (Exception e) { /* ignore */ }
socket = null;
}
authenticated = false;
connected = false;
throw ex; // Everything stoppped. Now throw the exception.
}
}
private void initReaderAndWriter() throws XMPPException {
try {
if (!usingCompression) {
reader = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF-8"));
}
else {
try {
Class zoClass = Class.forName("com.jcraft.jzlib.ZOutputStream");
//ZOutputStream out = new ZOutputStream(socket.getOutputStream(), JZlib.Z_BEST_COMPRESSION);
Constructor constructor =
zoClass.getConstructor(new Class[]{OutputStream.class, Integer.TYPE});
Object out = constructor.newInstance(new Object[] {socket.getOutputStream(), new Integer(9)});
//out.setFlushMode(JZlib.Z_PARTIAL_FLUSH);
Method method = zoClass.getMethod("setFlushMode", new Class[] {Integer.TYPE});
method.invoke(out, new Object[] {new Integer(1)});
writer = new BufferedWriter(new OutputStreamWriter((OutputStream) out, "UTF-8"));
Class ziClass = Class.forName("com.jcraft.jzlib.ZInputStream");
//ZInputStream in = new ZInputStream(socket.getInputStream());
constructor = ziClass.getConstructor(new Class[]{InputStream.class});
Object in = constructor.newInstance(new Object[] {socket.getInputStream()});
//in.setFlushMode(JZlib.Z_PARTIAL_FLUSH);
method = ziClass.getMethod("setFlushMode", new Class[] {Integer.TYPE});
method.invoke(in, new Object[] {new Integer(1)});
reader = new BufferedReader(new InputStreamReader((InputStream) in, "UTF-8"));
}
catch (Exception e) {
e.printStackTrace();
reader = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF-8"));
}
}
}
catch (IOException ioe) {
throw new XMPPException(
"XMPPError establishing connection with server.",
new XMPPError(502),
ioe);
}
// If debugging is enabled, we open a window and write out all network traffic.
if (configuration.isDebuggerEnabled()) {
if (debugger == null) {
// Detect the debugger class to use.
String className = null;
// Use try block since we may not have permission to get a system
// property (for example, when an applet).
try {
className = System.getProperty("smack.debuggerClass");
}
catch (Throwable t) {
}
Class debuggerClass = null;
if (className != null) {
try {
debuggerClass = Class.forName(className);
}
catch (Exception e) {
e.printStackTrace();
}
}
if (debuggerClass == null) {
try {
debuggerClass =
Class.forName("org.jivesoftware.smackx.debugger.EnhancedDebugger");
}
catch (Exception ex) {
try {
debuggerClass = Class.forName("org.jivesoftware.smack.debugger.LiteDebugger");
}
catch (Exception ex2) {
ex2.printStackTrace();
}
}
}
// Create a new debugger instance. If an exception occurs then disable the debugging
// option
try {
Constructor constructor =
debuggerClass.getConstructor(
new Class[] { XMPPConnection.class, Writer.class, Reader.class });
debugger = (SmackDebugger) constructor
.newInstance(new Object[]{this, writer, reader});
reader = debugger.getReader();
writer = debugger.getWriter();
}
catch (Exception e) {
e.printStackTrace();
DEBUG_ENABLED = false;
}
}
else {
// Obtain new reader and writer from the existing debugger
reader = debugger.newConnectionReader(reader);
writer = debugger.newConnectionWriter(writer);
}
}
}
/**
* Fires listeners on connection established events.
*/
private static void connectionEstablished(XMPPConnection connection) {
ConnectionEstablishedListener[] listeners = null;
synchronized (connectionEstablishedListeners) {
listeners = new ConnectionEstablishedListener[connectionEstablishedListeners.size()];
connectionEstablishedListeners.toArray(listeners);
}
for (int i = 0; i < listeners.length; i++) {
listeners[i].connectionEstablished(connection);
}
}
/***********************************************
* TLS code below
**********************************************/
/**
* Returns true if the connection to the server has successfully negotiated TLS. Once TLS
* has been negotiatied the connection has been secured.
*
* @return true if the connection to the server has successfully negotiated TLS.
*/
public boolean isUsingTLS() {
return usingTLS;
}
/**
* Returns the SASLAuthentication manager that is responsible for authenticating with
* the server.
*
* @return the SASLAuthentication manager that is responsible for authenticating with
* the server.
*/
public SASLAuthentication getSASLAuthentication() {
return saslAuthentication;
}
/**
* Notification message saying that the server supports TLS so confirm the server that we
* want to secure the connection.
*/
void startTLSReceived() {
if (!configuration.isTLSEnabled()) {
// Do not secure the connection using TLS since TLS was disabled
return;
}
try {
writer.write("
*
* Note: To use stream compression the smackx.jar file has to be present in the classpath.
*
* @return true if network traffic is being compressed.
*/
public boolean isUsingCompression() {
return usingCompression;
}
/**
* Starts using stream compression that will compress network traffic. Traffic can be
* reduced up to 90%. Therefore, stream compression is ideal when using a slow speed network
* connection. However, the server and the client will need to use more CPU time in order to
* un/compress network data so under high load the server performance might be affected.
*
* Stream compression has to have been previously offered by the server. Currently only the
* zlib method is supported by the client. Stream compression negotiation has to be done
* before authentication took place.
*
* Note: To use stream compression the smackx.jar file has to be present in the classpath.
*
* @return true if stream compression negotiation was successful.
*/
private boolean useCompression() {
// If stream compression was offered by the server and we want to use
// compression then send compression request to the server
if (authenticated) {
throw new IllegalStateException("Compression should be negotiated before authentication.");
}
try {
Class.forName("com.jcraft.jzlib.ZOutputStream");
}
catch (ClassNotFoundException e) {
throw new IllegalStateException("Cannot use compression. Add smackx.jar to the classpath");
}
if (hasAvailableCompressionMethod("zlib")) {
requestStreamCompression();
// Wait until compression is being used or a timeout happened
synchronized (this) {
try {
this.wait(SmackConfiguration.getPacketReplyTimeout() * 5);
}
catch (InterruptedException e) {}
}
return usingCompression;
}
return false;
}
/**
* Request the server that we want to start using stream compression. When using TLS
* then negotiation of stream compression can only happen after TLS was negotiated. If TLS
* compression is being used the stream compression should not be used.
*/
private void requestStreamCompression() {
try {
writer.write("