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/*
* Copyright (c) 2010-2018 Nathan Rajlich
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
package com.alipay.api.java_websocket.server;
import com.alipay.api.java_websocket.*;
import com.alipay.api.java_websocket.drafts.Draft;
import com.alipay.api.java_websocket.exceptions.InvalidDataException;
import com.alipay.api.java_websocket.exceptions.WebsocketNotConnectedException;
import com.alipay.api.java_websocket.framing.CloseFrame;
import com.alipay.api.java_websocket.framing.Framedata;
import com.alipay.api.java_websocket.handshake.ClientHandshake;
import com.alipay.api.java_websocket.handshake.Handshakedata;
import com.alipay.api.java_websocket.handshake.ServerHandshakeBuilder;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.util.*;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
/**
* WebSocketServer is an abstract class that only takes care of the
* HTTP handshake portion of WebSockets. It's up to a subclass to add functionality/purpose to the server.
*/
public abstract class WebSocketServer extends AbstractWebSocket implements Runnable {
public static int DECODERS = Runtime.getRuntime().availableProcessors();
/**
* Holds the list of active WebSocket connections. "Active" means WebSocket handshake is complete and socket can be written to, or read
* from.
*/
private final Collection connections;
/**
* The port number that this WebSocket server should listen on. Default is WebSocket.DEFAULT_PORT.
*/
private final InetSocketAddress address;
/**
* The socket channel for this WebSocket server.
*/
private ServerSocketChannel server;
/**
* The 'Selector' used to get event keys from the underlying socket.
*/
private Selector selector;
/**
* The Draft of the WebSocket protocol the Server is adhering to.
*/
private List drafts;
private Thread selectorthread;
private final AtomicBoolean isclosed = new AtomicBoolean(false);
protected List decoders;
private List iqueue;
private BlockingQueue buffers;
private int queueinvokes = 0;
private final AtomicInteger queuesize = new AtomicInteger(0);
private WebSocketServerFactory wsf = new DefaultWebSocketServerFactory();
/**
* Creates a WebSocketServer that will attempt to listen on port WebSocket.DEFAULT_PORT.
*
* @see #WebSocketServer(InetSocketAddress, int, List, Collection) more details here
*/
public WebSocketServer() {
this(new InetSocketAddress(WebSocket.DEFAULT_PORT), DECODERS, null);
}
/**
* Creates a WebSocketServer that will attempt to bind/listen on the given address.
*
* @param address The address to listen to
* @see #WebSocketServer(InetSocketAddress, int, List, Collection) more details here
*/
public WebSocketServer(InetSocketAddress address) {
this(address, DECODERS, null);
}
/**
* @param address The address (host:port) this server should listen on.
* @param decodercount The number of {@link WebSocketWorker}s that will be used to process the incoming network data. By default this
* will be Runtime.getRuntime().availableProcessors()
* @see #WebSocketServer(InetSocketAddress, int, List, Collection) more details here
*/
public WebSocketServer(InetSocketAddress address, int decodercount) {
this(address, decodercount, null);
}
/**
* @param address The address (host:port) this server should listen on.
* @param drafts The versions of the WebSocket protocol that this server instance should comply to. Clients that use an other protocol
* version will be rejected.
* @see #WebSocketServer(InetSocketAddress, int, List, Collection) more details here
*/
public WebSocketServer(InetSocketAddress address, List drafts) {
this(address, DECODERS, drafts);
}
/**
* @param address The address (host:port) this server should listen on.
* @param decodercount The number of {@link WebSocketWorker}s that will be used to process the incoming network data. By default this
* will be Runtime.getRuntime().availableProcessors()
* @param drafts The versions of the WebSocket protocol that this server instance should comply to. Clients that use an other
* protocol version will be rejected.
* @see #WebSocketServer(InetSocketAddress, int, List, Collection) more details here
*/
public WebSocketServer(InetSocketAddress address, int decodercount, List drafts) {
this(address, decodercount, drafts, new HashSet());
}
/**
* Creates a WebSocketServer that will attempt to bind/listen on the given address, and comply with Draft version
* draft.
*
* @param address The address (host:port) this server should listen on.
* @param decodercount The number of {@link WebSocketWorker}s that will be used to process the incoming network data. By default
* this will be Runtime.getRuntime().availableProcessors()
* @param drafts The versions of the WebSocket protocol that this server instance should comply to. Clients that use an
* other protocol version will be rejected.
* @param connectionscontainer Allows to specify a collection that will be used to store the websockets in.
If you plan to often
* iterate through the currently connected websockets you may want to use a collection that does not require
* synchronization like a {@link CopyOnWriteArraySet}. In that case make sure that you overload {@link
* #removeConnection(WebSocket)} and {@link #addConnection(WebSocket)}.
By default a {@link HashSet}
* will be used.
* @see #removeConnection(WebSocket) for more control over syncronized operation
* @see more about drafts
*/
public WebSocketServer(InetSocketAddress address, int decodercount, List drafts, Collection connectionscontainer) {
if (address == null || decodercount < 1 || connectionscontainer == null) {
throw new IllegalArgumentException("address and connectionscontainer must not be null and you need at least 1 decoder");
}
if (drafts == null) { this.drafts = Collections.emptyList(); } else { this.drafts = drafts; }
this.address = address;
this.connections = connectionscontainer;
setTcpNoDelay(false);
setReuseAddr(false);
iqueue = new LinkedList();
decoders = new ArrayList(decodercount);
buffers = new LinkedBlockingQueue();
for (int i = 0; i < decodercount; i++) {
WebSocketWorker ex = new WebSocketWorker();
decoders.add(ex);
ex.start();
}
}
/**
* Starts the server selectorthread that binds to the currently set port number and listeners for WebSocket connection requests. Creates
* a fixed thread pool with the size {@link WebSocketServer#DECODERS}
May only be called once.
*
* Alternatively you can call {@link WebSocketServer#run()} directly.
*
* @throws IllegalStateException Starting an instance again
*/
public void start() {
if (selectorthread != null) { throw new IllegalStateException(getClass().getName() + " can only be started once."); }
new Thread(this).start();
}
/**
* Closes all connected clients sockets, then closes the underlying ServerSocketChannel, effectively killing the server socket
* selectorthread, freeing the port the server was bound to and stops all internal workerthreads.
*
* If this method is called before the server is started it will never start.
*
* @param timeout Specifies how many milliseconds the overall close handshaking may take altogether before the connections are closed
* without proper close handshaking.
* @throws InterruptedException Interrupt
*/
public void stop(int timeout) throws InterruptedException {
if (!isclosed.compareAndSet(false, true)) { // this also makes sure that no further connections will be added to this.connections
return;
}
List socketsToClose;
// copy the connections in a list (prevent callback deadlocks)
synchronized (connections) {
socketsToClose = new ArrayList(connections);
}
for (WebSocket ws : socketsToClose) {
ws.close(CloseFrame.GOING_AWAY);
}
wsf.close();
synchronized (this) {
if (selectorthread != null && selector != null) {
selector.wakeup();
selectorthread.join(timeout);
}
}
}
public void stop() throws IOException, InterruptedException {
stop(0);
}
/**
* Returns all currently connected clients. This collection does not allow any modification e.g. removing a client.
*
* @return A unmodifiable collection of all currently connected clients
* @since 1.3.8
*/
public Collection getConnections() {
return Collections.unmodifiableCollection(new ArrayList(connections));
}
public InetSocketAddress getAddress() {
return this.address;
}
/**
* Gets the port number that this server listens on.
*
* @return The port number.
*/
public int getPort() {
int port = getAddress().getPort();
if (port == 0 && server != null) {
port = server.socket().getLocalPort();
}
return port;
}
public List getDraft() {
return Collections.unmodifiableList(drafts);
}
// Runnable IMPLEMENTATION /////////////////////////////////////////////////
public void run() {
synchronized (this) {
if (selectorthread != null) { throw new IllegalStateException(getClass().getName() + " can only be started once."); }
selectorthread = Thread.currentThread();
if (isclosed.get()) {
return;
}
}
selectorthread.setName("WebSocketSelector-" + selectorthread.getId());
try {
server = ServerSocketChannel.open();
server.configureBlocking(false);
ServerSocket socket = server.socket();
socket.setReceiveBufferSize(WebSocketImpl.RCVBUF);
socket.setReuseAddress(isReuseAddr());
socket.bind(address);
selector = Selector.open();
server.register(selector, server.validOps());
startConnectionLostTimer();
onStart();
} catch (IOException ex) {
handleFatal(null, ex);
return;
}
try {
int iShutdownCount = 5;
int selectTimeout = 0;
while (!selectorthread.isInterrupted() && iShutdownCount != 0) {
SelectionKey key = null;
WebSocketImpl conn = null;
try {
if (isclosed.get()) {
selectTimeout = 5;
}
int keyCount = selector.select(selectTimeout);
if (keyCount == 0 && isclosed.get()) {
iShutdownCount--;
}
Set keys = selector.selectedKeys();
Iterator i = keys.iterator();
while (i.hasNext()) {
key = i.next();
conn = null;
if (!key.isValid()) {
// Object o = key.attachment();
continue;
}
if (key.isAcceptable()) {
if (!onConnect(key)) {
key.cancel();
continue;
}
SocketChannel channel = server.accept();
if (channel == null) {
continue;
}
channel.configureBlocking(false);
Socket socket = channel.socket();
socket.setTcpNoDelay(isTcpNoDelay());
socket.setKeepAlive(true);
WebSocketImpl w = wsf.createWebSocket(this, drafts);
w.key = channel.register(selector, SelectionKey.OP_READ, w);
try {
w.channel = wsf.wrapChannel(channel, w.key);
i.remove();
allocateBuffers(w);
continue;
} catch (IOException ex) {
if (w.key != null) { w.key.cancel(); }
handleIOException(w.key, null, ex);
}
continue;
}
if (key.isReadable()) {
conn = (WebSocketImpl) key.attachment();
ByteBuffer buf = takeBuffer();
if (conn.channel == null) {
if (key != null) { key.cancel(); }
handleIOException(key, conn, new IOException());
continue;
}
try {
if (SocketChannelIOHelper.read(buf, conn, conn.channel)) {
if (buf.hasRemaining()) {
conn.inQueue.put(buf);
queue(conn);
i.remove();
if (conn.channel instanceof WrappedByteChannel) {
if (((WrappedByteChannel) conn.channel).isNeedRead()) {
iqueue.add(conn);
}
}
} else { pushBuffer(buf); }
} else {
pushBuffer(buf);
}
} catch (IOException e) {
pushBuffer(buf);
throw e;
}
}
if (key.isWritable()) {
conn = (WebSocketImpl) key.attachment();
if (SocketChannelIOHelper.batch(conn, conn.channel)) {
if (key.isValid()) { key.interestOps(SelectionKey.OP_READ); }
}
}
}
while (!iqueue.isEmpty()) {
conn = iqueue.remove(0);
WrappedByteChannel c = ((WrappedByteChannel) conn.channel);
ByteBuffer buf = takeBuffer();
try {
if (SocketChannelIOHelper.readMore(buf, conn, c)) { iqueue.add(conn); }
if (buf.hasRemaining()) {
conn.inQueue.put(buf);
queue(conn);
} else {
pushBuffer(buf);
}
} catch (IOException e) {
pushBuffer(buf);
throw e;
}
}
} catch (CancelledKeyException e) {
// an other thread may cancel the key
} catch (ClosedByInterruptException e) {
return; // do the same stuff as when InterruptedException is thrown
} catch (IOException ex) {
if (key != null) { key.cancel(); }
handleIOException(key, conn, ex);
} catch (InterruptedException e) {
return;// FIXME controlled shutdown (e.g. take care of buffermanagement)
}
}
} catch (RuntimeException e) {
// should hopefully never occur
handleFatal(null, e);
} finally {
stopConnectionLostTimer();
if (decoders != null) {
for (WebSocketWorker w : decoders) {
w.interrupt();
}
}
if (selector != null) {
try {
selector.close();
} catch (IOException e) {
onError(null, e);
}
}
if (server != null) {
try {
server.close();
} catch (IOException e) {
onError(null, e);
}
}
}
}
protected void allocateBuffers(WebSocket c) throws InterruptedException {
if (queuesize.get() >= 2 * decoders.size() + 1) {
return;
}
queuesize.incrementAndGet();
buffers.put(createBuffer());
}
protected void releaseBuffers(WebSocket c) throws InterruptedException {
// queuesize.decrementAndGet();
// takeBuffer();
}
public ByteBuffer createBuffer() {
return ByteBuffer.allocate(WebSocketImpl.RCVBUF);
}
protected void queue(WebSocketImpl ws) throws InterruptedException {
if (ws.workerThread == null) {
ws.workerThread = decoders.get(queueinvokes % decoders.size());
queueinvokes++;
}
ws.workerThread.put(ws);
}
private ByteBuffer takeBuffer() throws InterruptedException {
return buffers.take();
}
private void pushBuffer(ByteBuffer buf) throws InterruptedException {
if (buffers.size() > queuesize.intValue()) { return; }
buffers.put(buf);
}
private void handleIOException(SelectionKey key, WebSocket conn, IOException ex) {
// onWebsocketError( conn, ex );// conn may be null here
if (conn != null) {
conn.closeConnection(CloseFrame.ABNORMAL_CLOSE, ex.getMessage());
} else if (key != null) {
SelectableChannel channel = key.channel();
if (channel != null && channel.isOpen()) { // this could be the case if the IOException ex is a SSLException
try {
channel.close();
} catch (IOException e) {
// there is nothing that must be done here
}
}
}
}
private void handleFatal(WebSocket conn, Exception e) {
onError(conn, e);
//Shutting down WebSocketWorkers, see #222
if (decoders != null) {
for (WebSocketWorker w : decoders) {
w.interrupt();
}
}
if (selectorthread != null) {
selectorthread.interrupt();
}
try {
stop();
} catch (IOException e1) {
onError(null, e1);
} catch (InterruptedException e1) {
Thread.currentThread().interrupt();
onError(null, e1);
}
}
public final void onWebsocketMessage(WebSocket conn, String message) {
onMessage(conn, message);
}
public final void onWebsocketMessage(WebSocket conn, ByteBuffer blob) {
onMessage(conn, blob);
}
public final void onWebsocketOpen(WebSocket conn, Handshakedata handshake) {
if (addConnection(conn)) {
onOpen(conn, (ClientHandshake) handshake);
}
}
public final void onWebsocketClose(WebSocket conn, int code, String reason, boolean remote) {
selector.wakeup();
try {
if (removeConnection(conn)) {
onClose(conn, code, reason, remote);
}
} finally {
try {
releaseBuffers(conn);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
/**
* This method performs remove operations on the connection and therefore also gives control over whether the operation shall be
* synchronized
*
* {@link #WebSocketServer(InetSocketAddress, int, List, Collection)} allows to specify a collection which will be used to store current
* connections in.
Depending on the type on the connection, modifications of that collection may have to be synchronized.
*
* @param ws The Webscoket connection which should be removed
* @return Removing connection successful
*/
protected boolean removeConnection(WebSocket ws) {
boolean removed = false;
synchronized (connections) {
if (this.connections.contains(ws)) {
removed = this.connections.remove(ws);
} else {
//Don't throw an assert error if the ws is not in the list. e.g. when the other endpoint did not send any handshake. see
// #512
}
}
if (isclosed.get() && connections.size() == 0) {
selectorthread.interrupt();
}
return removed;
}
public ServerHandshakeBuilder onWebsocketHandshakeReceivedAsServer(WebSocket conn, Draft draft, ClientHandshake request) throws
InvalidDataException {
return super.onWebsocketHandshakeReceivedAsServer(conn, draft, request);
}
/**
* @param ws the Webscoket connection which should be added
* @return Adding connection successful
* @see #removeConnection(WebSocket)
*/
protected boolean addConnection(WebSocket ws) {
if (!isclosed.get()) {
synchronized (connections) {
boolean succ = this.connections.add(ws);
assert (succ);
return succ;
}
} else {
// This case will happen when a new connection gets ready while the server is already stopping.
ws.close(CloseFrame.GOING_AWAY);
return true;// for consistency sake we will make sure that both onOpen will be called
}
}
public final void onWebsocketError(WebSocket conn, Exception ex) {
onError(conn, ex);
}
public final void onWriteDemand(WebSocket w) {
WebSocketImpl conn = (WebSocketImpl) w;
try {
conn.key.interestOps(SelectionKey.OP_READ | SelectionKey.OP_WRITE);
} catch (CancelledKeyException e) {
// the thread which cancels key is responsible for possible cleanup
conn.outQueue.clear();
}
selector.wakeup();
}
public void onWebsocketCloseInitiated(WebSocket conn, int code, String reason) {
onCloseInitiated(conn, code, reason);
}
public void onWebsocketClosing(WebSocket conn, int code, String reason, boolean remote) {
onClosing(conn, code, reason, remote);
}
public void onCloseInitiated(WebSocket conn, int code, String reason) {
}
public void onClosing(WebSocket conn, int code, String reason, boolean remote) {
}
public final void setWebSocketFactory(WebSocketServerFactory wsf) {
this.wsf = wsf;
}
public final WebSocketFactory getWebSocketFactory() {
return wsf;
}
/**
* Returns whether a new connection shall be accepted or not.
Therefore method is well suited to implement some kind of connection
* limitation.
*
* @param key the SelectionKey for the new connection
* @return Can this new connection be accepted
* @see #onOpen(WebSocket, ClientHandshake)
* @see #onWebsocketHandshakeReceivedAsServer(WebSocket, Draft, ClientHandshake)
**/
protected boolean onConnect(SelectionKey key) {
//FIXME
return true;
}
/**
* Getter to return the socket used by this specific connection
*
* @param conn The specific connection
* @return The socket used by this connection
*/
private Socket getSocket(WebSocket conn) {
WebSocketImpl impl = (WebSocketImpl) conn;
return ((SocketChannel) impl.key.channel()).socket();
}
public InetSocketAddress getLocalSocketAddress(WebSocket conn) {
return (InetSocketAddress) getSocket(conn).getLocalSocketAddress();
}
public InetSocketAddress getRemoteSocketAddress(WebSocket conn) {
return (InetSocketAddress) getSocket(conn).getRemoteSocketAddress();
}
/**
* Called after an opening handshake has been performed and the given websocket is ready to be written on.
*
* @param conn The WebSocket instance this event is occuring on.
* @param handshake The handshake of the websocket instance
*/
public abstract void onOpen(WebSocket conn, ClientHandshake handshake);
/**
* Called after the websocket connection has been closed.
*
* @param conn The WebSocket instance this event is occuring on.
* @param code The codes can be looked up here: {@link CloseFrame}
* @param reason Additional information string
* @param remote Returns whether or not the closing of the connection was initiated by the remote host.
**/
public abstract void onClose(WebSocket conn, int code, String reason, boolean remote);
/**
* Callback for string messages received from the remote host
*
* @param conn The WebSocket instance this event is occuring on.
* @param message The UTF-8 decoded message that was received.
* @see #onMessage(WebSocket, ByteBuffer)
**/
public abstract void onMessage(WebSocket conn, String message);
/**
* Called when errors occurs. If an error causes the websocket connection to fail {@link #onClose(WebSocket, int, String, boolean)} will
* be called additionally.
This method will be called primarily because of IO or protocol errors.
If the given exception is an
* RuntimeException that probably means that you encountered a bug.
*
* @param conn Can be null if there error does not belong to one specific websocket. For example if the servers port could not be
* bound.
* @param ex The exception causing this error
**/
public abstract void onError(WebSocket conn, Exception ex);
/**
* Called when the server started up successfully.
*
* If any error occured, onError is called instead.
*/
public abstract void onStart();
/**
* Callback for binary messages received from the remote host
*
* @param conn The WebSocket instance this event is occurring on.
* @param message The binary message that was received.
* @see #onMessage(WebSocket, ByteBuffer)
**/
public void onMessage(WebSocket conn, ByteBuffer message) {
}
/**
* Send a text to all connected endpoints
*
* @param text the text to send to the endpoints
*/
public void broadcast(String text) {
broadcast(text, connections);
}
/**
* Send a byte array to all connected endpoints
*
* @param data the data to send to the endpoints
*/
public void broadcast(byte[] data) {
broadcast(data, connections);
}
/**
* Send a ByteBuffer to all connected endpoints
*
* @param data the data to send to the endpoints
*/
public void broadcast(ByteBuffer data) {
broadcast(data, connections);
}
/**
* Send a byte array to a specific collection of websocket connections
*
* @param data the data to send to the endpoints
* @param clients a collection of endpoints to whom the text has to be send
*/
public void broadcast(byte[] data, Collection clients) {
if (data == null || clients == null) {
throw new IllegalArgumentException();
}
broadcast(ByteBuffer.wrap(data), clients);
}
/**
* Send a ByteBuffer to a specific collection of websocket connections
*
* @param data the data to send to the endpoints
* @param clients a collection of endpoints to whom the text has to be send
*/
public void broadcast(ByteBuffer data, Collection clients) {
if (data == null || clients == null) {
throw new IllegalArgumentException();
}
doBroadcast(data, clients);
}
/**
* Send a text to a specific collection of websocket connections
*
* @param text the text to send to the endpoints
* @param clients a collection of endpoints to whom the text has to be send
*/
public void broadcast(String text, Collection clients) {
if (text == null || clients == null) {
throw new IllegalArgumentException();
}
doBroadcast(text, clients);
}
/**
* Private method to cache all the frames to improve memory footprint and conversion time
*
* @param data the data to broadcast
* @param clients the clients to send the message to
*/
private void doBroadcast(Object data, Collection clients) {
String sData = null;
if (data instanceof String) {
sData = (String) data;
}
ByteBuffer bData = null;
if (data instanceof ByteBuffer) {
bData = (ByteBuffer) data;
}
if (sData == null && bData == null) {
return;
}
Map> draftFrames = new HashMap>();
for (WebSocket client : clients) {
if (client != null) {
Draft draft = client.getDraft();
if (!draftFrames.containsKey(draft)) {
List frames = null;
if (sData != null) {
frames = draft.createFrames(sData, false);
}
if (bData != null) {
frames = draft.createFrames(bData, false);
}
if (frames != null) {
draftFrames.put(draft, frames);
}
}
try {
client.sendFrame(draftFrames.get(draft));
} catch (WebsocketNotConnectedException e) {
//Ignore this exception in this case
}
}
}
}
/**
* This class is used to process incoming data
*/
public class WebSocketWorker extends Thread {
private BlockingQueue iqueue;
public WebSocketWorker() {
iqueue = new LinkedBlockingQueue();
setName("WebSocketWorker-" + getId());
setUncaughtExceptionHandler(new UncaughtExceptionHandler() {
public void uncaughtException(Thread t, Throwable e) {
}
});
}
public void put(WebSocketImpl ws) throws InterruptedException {
iqueue.put(ws);
}
public void run() {
WebSocketImpl ws = null;
try {
while (true) {
ByteBuffer buf;
ws = iqueue.take();
buf = ws.inQueue.poll();
assert (buf != null);
try {
ws.decode(buf);
} catch (Exception e) {
} finally {
pushBuffer(buf);
}
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (RuntimeException e) {
handleFatal(ws, e);
}
}
}
}