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 } 
```

        ctx.attr(REQUEST_KEY).set(req);


        if (WebSocketHAProxyHandshaker.isHAProxyReqeust(req)) {
            final String wsUrl = getWebSocketLocation(config.isTls(), req);
            final WebSocketHAProxyHandshaker haHandshaker = new WebSocketHAProxyHandshaker(wsUrl, null, 65365);
            final ChannelFuture handshakeFuture = haHandshaker.handshake(ctx.channel(), req);
            handshakeFuture.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(final ChannelFuture future) throws Exception {
                    if (future.isSuccess()) {
                        final ChannelPipeline pipeline = future.channel().pipeline();
                        pipeline.remove(SockJsHandler.class);
                        pipeline.remove(CorsInboundHandler.class);
                        pipeline.remove(CorsOutboundHandler.class);
                        pipeline.replace(WebSocketTransport.class, "websocket-ha-proxy",
                                new WebSocketHAProxyTransport(haHandshaker));
                        pipeline.addLast(new WebSocketSendHandler());
                    }
                }
            });
            return;
        }
        final String wsUrl = getWebSocketLocation(config.isTls(), req, Transports.Type.WEBSOCKET.path());
        final WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(wsUrl, null, false);
        handshaker = wsFactory.newHandshaker(req);


        if (handshaker == null) {
            WebSocketServerHandshakerFactory.sendUnsupportedWebSocketVersionResponse(ctx.channel());
        } else {
            final ChannelFuture handshakeFuture = handshaker.handshake(ctx.channel(), req);
            handshakeFuture.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(final ChannelFuture future) throws Exception {
                    if (future.isSuccess()) {
                        ctx.pipeline().remove(SockJsHandler.class);
                        ctx.pipeline().remove(CorsInboundHandler.class);

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        response.headers().set(CONTENT_LENGTH, response.content().readableBytes());
        boolean hasKeepAliveHeader = HttpHeaders.equalsIgnoreCase(KEEP_ALIVE, request.headers().get(CONNECTION));
        if (!request.getProtocolVersion().isKeepAliveDefault() && hasKeepAliveHeader) {
            response.headers().set(CONNECTION, KEEP_ALIVE);
        }
        final ChannelFuture wf = channel.writeAndFlush(response);
        if (!HttpHeaders.isKeepAlive(request)) {
            wf.addListener(ChannelFutureListener.CLOSE);
        }
    }

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        ctx.fireUserEventTriggered(Event.HANDLE_SESSION);
    }


    private void handleContent(final ChannelHandlerContext ctx, final ByteBuf nounce) {
        final ByteBuf key = haHandshaker.calculateLastKey(nounce);
        final ChannelFuture channelFuture = ctx.write(key);
        haHandshaker.addWsCodec(channelFuture);
    }

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        }
        return doBind(localAddress);
    }


    private ChannelFuture doBind(final SocketAddress localAddress) {
        final ChannelFuture regFuture = initAndRegister();
        final Channel channel = regFuture.channel();
        if (regFuture.cause() != null) {
            return regFuture;
        }


        if (regFuture.isDone()) {
            // At this point we know that the registration was complete and succesful.
            ChannelPromise promise = channel.newPromise();
            doBind0(regFuture, channel, localAddress, promise);
            return promise;
        } else {
            // Registration future is almost always fulfilled already, but just in case it's not.
            final PendingRegistrationPromise promise = new PendingRegistrationPromise(channel);
            regFuture.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    Throwable cause = future.cause();
                    if (cause != null) {
                        // Registration on the EventLoop failed so fail the ChannelPromise directly to not cause an

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            channel.unsafe().closeForcibly();
            // as the Channel is not registered yet we need to force the usage of the GlobalEventExecutor
            return new DefaultChannelPromise(channel, GlobalEventExecutor.INSTANCE).setFailure(t);
        }


        ChannelFuture regFuture = group().register(channel);
        if (regFuture.cause() != null) {
            if (channel.isRegistered()) {
                channel.close();
            } else {
                channel.unsafe().closeForcibly();
            }

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    private void writeHttpHeaders(ChannelHandlerContext ctx, HttpClientRequest<?> rxRequest,
                                  MultipleFutureListener allWritesListener) {
        final long startTimeMillis = Clock.newStartTimeMillis();
        eventsSubject.onEvent(HttpClientMetricsEvent.REQUEST_HEADERS_WRITE_START);
        ChannelFuture writeFuture = ctx.write(rxRequest.getNettyRequest());
        addWriteCompleteEvents(writeFuture, startTimeMillis, HttpClientMetricsEvent.REQUEST_HEADERS_WRITE_SUCCESS,
                               HttpClientMetricsEvent.REQUEST_HEADERS_WRITE_FAILED);
        allWritesListener.listen(writeFuture);
    }

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    private ChannelFuture writeAContentChunk(ChannelHandlerContext ctx, MultipleFutureListener allWritesListener,
                                             Object chunk) {
        eventsSubject.onEvent(HttpClientMetricsEvent.REQUEST_CONTENT_WRITE_START);
        final long startTimeMillis = Clock.newStartTimeMillis();
        ChannelFuture writeFuture = ctx.write(chunk);
        addWriteCompleteEvents(writeFuture, startTimeMillis, HttpClientMetricsEvent.REQUEST_CONTENT_WRITE_SUCCESS,
                               HttpClientMetricsEvent.REQUEST_CONTENT_WRITE_FAILED);
        allWritesListener.listen(writeFuture);
        return writeFuture;
    }

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    public ByteBufAllocator getAllocator() {
        return nettyChannel.alloc();
    }


    protected ChannelFuture writeOnChannel(Object msg) {
        ChannelFuture writeFuture = getChannel().write(msg); // Calling write on context will be wrong as the context will be of a component not necessarily, the tail of the pipeline.
        unflushedWritesListener.get().listen(writeFuture);
        return writeFuture;
    }

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        return completionObservable;
    }


    public void cancelPendingFutures(boolean mayInterruptIfRunning) {
        for (Iterator<ChannelFuture> iterator = pendingFutures.iterator(); iterator.hasNext(); ) {
            ChannelFuture pendingFuture = iterator.next();
            iterator.remove();
            pendingFuture.cancel(mayInterruptIfRunning);
        }
    }

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    public ChannelFuture connect(final Subscriber<? super ObservableConnection<I, O>> subscriber,
                                 RxClient.ServerInfo serverInfo,
                                 final ClientConnectionFactory<I, O,? extends ObservableConnection<I, O>> connectionFactory) {
        final long startTimeMillis = Clock.newStartTimeMillis();
        eventsSubject.onEvent(ClientMetricsEvent.CONNECT_START);
        final ChannelFuture connectFuture = clientBootstrap.connect(serverInfo.getHost(), serverInfo.getPort());


        subscriber.add(Subscriptions.create(new Action0() {
            @Override
            public void call() {
                if (!connectFuture.isDone()) {
                    connectFuture.cancel(true); // Unsubscribe here means, no more connection is required. A close on connection is explicit.
                }
            }
        }));


        connectFuture.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                try {
                    if (!future.isSuccess()) {
                        eventsSubject.onEvent(ClientMetricsEvent.CONNECT_FAILED, Clock.onEndMillis(startTimeMillis),

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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