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 } 
```

            b.group(new NioEventLoopGroup())
             .channel(NioSocketChannel.class)
             .handler(new DiscardClientHandler(firstMessageSize));


            // Make the connection attempt.
            ChannelFuture f = b.connect(host, port).sync();


            // Wait until the connection is closed.
            f.channel().closeFuture().sync();
        } finally {
            b.shutdown();
        }
    }

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                    ch.pipeline().addLast(new DiscardServerHandler());
                }
             });


            // Bind and start to accept incoming connections.
            ChannelFuture f = b.bind(port).sync();


            // Wait until the server socket is closed.
            // In this example, this does not happen, but you can do that to gracefully
            // shut down your server.
            f.channel().closeFuture().sync();
        } finally {
            b.shutdown();
        }
    }

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            // Start the client.
            Channel ch = cb.connect(addr).sync().channel();


            // Read commands from the stdin.
            System.out.println("Enter text (quit to end)");
            ChannelFuture lastWriteFuture = null;
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            for (;;) {
                String line = in.readLine();
                if (line == null || "quit".equalsIgnoreCase(line)) {
                    break;
                }


                // Sends the received line to the server.
                lastWriteFuture = ch.write(line);
            }


            // Wait until all messages are flushed before closing the channel.
            if (lastWriteFuture != null) {
                lastWriteFuture.awaitUninterruptibly();
            }
        } finally {
            sb.shutdown();
            cb.shutdown();
        }

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        // Write the initial line and the header.
        ctx.write(response);


        // Write the content.
        ChannelFuture writeFuture = ctx.write(new ChunkedFile(raf, 0, fileLength, 8192));


        // Decide whether to close the connection or not.
        if (!isKeepAlive(request)) {
            // Close the connection when the whole content is written out.
            writeFuture.addListener(ChannelFutureListener.CLOSE);
        }
    }

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                getWebSocketLocation(ctx.pipeline(), req, websocketPath), subprotocols, allowExtensions);
        final WebSocketServerHandshaker 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(ChannelFuture future) throws Exception {
                    if (!future.isSuccess()) {
                        ctx.fireExceptionCaught(future.cause());
                    }

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                WebSocketServerProtocolHandler.forbiddenHttpRequestResponder());
        }
    }


    private static void sendHttpResponse(ChannelHandlerContext ctx, HttpRequest req, HttpResponse res) {
        ChannelFuture f = ctx.channel().write(res);
        if (!isKeepAlive(req) || res.getStatus().code() != 200) {
            f.addListener(ChannelFutureListener.CLOSE);
        }
    }

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        Bootstrap b = new Bootstrap();
        b.group(inboundChannel.eventLoop())
         .channel(NioSocketChannel.class)
         .handler(new HexDumpProxyBackendHandler(inboundChannel))
         .option(ChannelOption.AUTO_READ, false);
        ChannelFuture f = b.connect(remoteHost, remotePort);
        outboundChannel = f.channel();
        f.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (future.isSuccess()) {
                    // connection complete start to read first data
                    inboundChannel.read();

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            ctx.close(future);
            return;
        }


        sendGoAwayFrame(ctx, SpdySessionStatus.OK);
        ChannelFuture f = ctx.flush();
        if (spdySession.noActiveStreams()) {
            f.addListener(new ClosingChannelFutureListener(ctx, future));
        } else {
            closeSessionFuture = ctx.newPromise();
            closeSessionFuture.addListener(new ClosingChannelFutureListener(ctx, future));
        }
        // FIXME: Close the connection forcibly after timeout.

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                                    new LoggingHandler(LogLevel.INFO),
                                    new MsgEchoPeerHandler(messageSize));
                        }
                    });
            // Start the peer.
            final ChannelFuture f = boot.connect(peer, self).sync();
            // Wait until the connection is closed.
            f.channel().closeFuture().sync();
        } finally {
            // Shut down the event loop to terminate all threads.
            boot.shutdown();
        }
    }

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                                    new LoggingHandler(LogLevel.INFO),
                                    new ByteEchoClientHandler(messageSize));
                        }
                    });
            // Start the client.
            final ChannelFuture f = boot.connect(host, port).sync();
            // Wait until the connection is closed.
            f.channel().closeFuture().sync();
        } finally {
            // Shut down the event loop to terminate all threads.
            boot.shutdown();
        }
    }

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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