Examples of io.netty.channel.ChannelFuture

io.netty.channel.ChannelFuture
- NEVER DO THIS {@code @Override}public void messageReceived( {@link ChannelHandlerContext} ctx, GoodByeMessage msg) {{@link ChannelFuture} future = ctx.channel().close();future.awaitUninterruptibly(); // Perform post-closure operation // ... } // GOOD {@code @Override}public void messageReceived( {@link ChannelHandlerContext} ctx, GoodByeMessage msg) {{@link ChannelFuture} future = ctx.channel().close();future.addListener(new {@link ChannelFutureListener}() { public void operationComplete( {@link ChannelFuture} future) {// Perform post-closure operation // ... } }); }
In spite of the disadvantages mentioned above, there are certainly the cases where it is more convenient to call {@link #await()}. In such a case, please make sure you do not call {@link #await()} in an I/O thread. Otherwise,{@link BlockingOperationException} will be raised to prevent a dead lock.
Do not confuse I/O timeout and await timeout
The timeout value you specify with {@link #await(long)}, {@link #await(long,TimeUnit)}, {@link #awaitUninterruptibly(long)}, or {@link #awaitUninterruptibly(long,TimeUnit)} are not related with I/Otimeout at all. If an I/O operation times out, the future will be marked as 'completed with failure,' as depicted in the diagram above. For example, connect timeout should be configured via a transport-specific option:
```
 // BAD - NEVER DO THIS {@link Bootstrap} b = ...;{@link ChannelFuture} f = b.connect(...);f.awaitUninterruptibly(10, TimeUnit.SECONDS); if (f.isCancelled()) { // Connection attempt cancelled by user } else if (!f.isSuccess()) { // You might get a NullPointerException here because the future // might not be completed yet. f.getCause().printStackTrace(); } else { // Connection established successfully } // GOOD {@link Bootstrap} b = ...;// Configure the connect timeout option. b.setOption( {@link ChannelOption}.CONNECT_TIMEOUT_MILLIS, 10000); {@link ChannelFuture} f = b.connect(...);f.awaitUninterruptibly(); // Now we are sure the future is completed. assert f.isDone(); if (f.isCancelled()) { // Connection attempt cancelled by user } else if (!f.isSuccess()) { f.getCause().printStackTrace(); } else { // Connection established successfully } 
```

                this.getWebSocketLocation(req), "v10.stomp,v11.stomp", false);
        this.handshaker = wsFactory.newHandshaker(req);
        if (this.handshaker == null) {
            WebSocketServerHandshakerFactory.sendUnsupportedWebSocketVersionResponse(ctx.channel());
        } else {
            ChannelFuture handshake = this.handshaker.handshake(ctx.channel(), req);
            handshake.addListener(new ChannelFutureListener() {


                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    if (future.isSuccess()) {
                        // we need to insert an encoder that takes the underlying ChannelBuffer of a StompFrame.toHornetQBuffer and

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            res.content().writeBytes(res.getStatus().toString().getBytes(CharsetUtil.UTF_8));
            setContentLength(res, res.content().readableBytes());
        }


        // Send the response and close the connection if necessary.
        ChannelFuture f = ctx.writeAndFlush(res);
        if (!isKeepAlive(req) || res.getStatus().code() != 200) {
            f.addListener(ChannelFutureListener.CLOSE);
        }
    }

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                @Override
                public void initChannel(SocketChannel channel) throws Exception {
                    channel.pipeline().addLast(new TestServerHandler());
                };
            });
            ChannelFuture bindFuture = bootstrap.bind();
            bindFuture.sync();
            Channel channel = bindFuture.channel();
            ChannelFuture closeFuture = channel.closeFuture();
            //closeFuture.sync();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {

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         res.content().writeBytes(res.getStatus().toString().getBytes(CharsetUtil.UTF_8));
         HttpHeaders.setContentLength(res, res.content().readableBytes());
      }


      // Send the response and close the connection if necessary.
      ChannelFuture f = ctx.channel().writeAndFlush(res);
      if (!isKeepAlive(req) || res.getStatus().code() != 200) {
         f.addListener(ChannelFutureListener.CLOSE);
      }
   }

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            throw new IllegalStateException("renegotiation disabled");
        }


        ChannelHandlerContext ctx = this.ctx;
        Channel channel = ctx.getChannel();
        ChannelFuture handshakeFuture;
        Exception exception = null;


        synchronized (handshakeLock) {
            if (handshaking) {
                return this.handshakeFuture;
            } else {
                handshaking = true;
                try {
                    engine.beginHandshake();
                    runDelegatedTasks();
                    handshakeFuture = this.handshakeFuture = future(channel);
                } catch (Exception e) {
                    handshakeFuture = this.handshakeFuture = failedFuture(channel, e);
                    exception = e;
                }
            }
        }


        if (exception == null) { // Began handshake successfully.
            try {
                wrapNonAppData(ctx, channel);
            } catch (SSLException e) {
                fireExceptionCaught(ctx, e);
                handshakeFuture.setFailure(e);
            }
        } else { // Failed to initiate handshake.
            fireExceptionCaught(ctx, exception);
        }

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    }


    private ChannelFuture wrap(ChannelHandlerContext context, Channel channel)
            throws SSLException {


        ChannelFuture future = null;
        ChannelBuffer msg;
        ByteBuffer outNetBuf = bufferPool.acquire();
        boolean success = true;
        boolean offered = false;
        boolean needsUnwrap = false;

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            pendingEncryptedWritesLock.unlock();
        }
    }


    private ChannelFuture wrapNonAppData(ChannelHandlerContext ctx, Channel channel) throws SSLException {
        ChannelFuture future = null;
        ByteBuffer outNetBuf = bufferPool.acquire();


        SSLEngineResult result;
        try {
            for (;;) {
                synchronized (handshakeLock) {
                    result = engine.wrap(EMPTY_BUFFER, outNetBuf);
                }


                if (result.bytesProduced() > 0) {
                    outNetBuf.flip();
                    ChannelBuffer msg = ChannelBuffers.buffer(outNetBuf.remaining());
                    msg.writeBytes(outNetBuf.array(), 0, msg.capacity());
                    outNetBuf.clear();


                    future = future(channel);
                    future.addListener(new ChannelFutureListener() {
                        @Override
                        public void operationComplete(ChannelFuture future)
                                throws Exception {
                            if (future.getCause() instanceof ClosedChannelException) {
                                synchronized (ignoreClosedChannelExceptionLock) {
                                    ignoreClosedChannelException ++;
                                }
                            }
                        }

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            if (!engine.isInboundDone()) {
                if (sentCloseNotify.compareAndSet(false, true)) {
                    engine.closeOutbound();
                    try {
                        ChannelFuture closeNotifyFuture = wrapNonAppData(context, e.getChannel());
                        closeNotifyFuture.addListener(
                                new ClosingChannelFutureListener(context, e));
                        success = true;
                    } catch (SSLException ex) {
                        if (logger.isDebugEnabled()) {
                            logger.debug("Failed to encode a close_notify message", ex);

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                        // ChunkedInput.nextChunk() returned null and it has
                        // not reached at the end of input.  Let's wait until
                        // more chunks arrive.  Nothing to write or notify.
                        break;
                    } else {
                        ChannelFuture writeFuture;
                        if (endOfInput) {
                            this.currentEvent = null;
                            closeInput(chunks);
                            writeFuture = currentEvent.getFuture();
                        } else {
                            writeFuture = future(channel);
                            writeFuture.addListener(new ChannelFutureListener() {
                                @Override
                                public void operationComplete(ChannelFuture future)
                                        throws Exception {
                                    if (!future.isSuccess()) {
                                        currentEvent.getFuture().setFailure(future.getCause());

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    @Override
    public int write(ByteBuffer src) throws IOException {
        int written = src.remaining();
        
        // create a new ChannelFuture and add it to the aggregator
        ChannelFuture future =  Channels.future(context.getChannel(), true);
        aggregator.addFuture(future);
        
        Channels.write(context, future, ChannelBuffers.wrappedBuffer(src), remote);
        return written;
    }

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Examples of io.netty.channel.ChannelFuture

Do not confuse I/O timeout and await timeout

Related Classes of io.netty.channel.ChannelFuture