Examples of io.netty.channel.ChannelPromise

io.netty.channel.ChannelPromise
Special {@link ChannelFuture} which is writable.


    public ChannelPromise write(final RequestMessage requestMessage, final CompletableFuture<ResultSet> future) {
        // once there is a completed write, then create a traverser for the result set and complete
        // the promise so that the client knows that that it can start checking for results.
        final Connection thisConnection = this;
        final ChannelPromise promise = channel.newPromise()
                .addListener(f -> {
                    if (!f.isSuccess()) {
                        logger.debug(String.format("Write on connection %s failed", thisConnection), f.cause());
                        thisConnection.isDead = true;
                        thisConnection.returnToPool();

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        }
    }


    private void shutdown(final CompletableFuture<Void> future) {
        channel.writeAndFlush(new CloseWebSocketFrame());
        final ChannelPromise promise = channel.newPromise();
        promise.addListener(f -> {
            if (f.cause() != null)
                future.completeExceptionally(f.cause());
            else
                future.complete(null);
        });

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    }


    @Override
    public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) throws Exception {
        originalPromise = promise;
        ChannelPromise downPromise = ctx.newPromise();
        downPromise.addListener(new GenericFutureListener<Future<Void>>() {
            @Override
            public void operationComplete(Future<Void> future) throws Exception {
                if (!future.isSuccess() && !originalPromise.isDone()) {
                    originalPromise.setFailure(future.cause());
                }

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                    int connectTimeoutMillis = config().getConnectTimeoutMillis();
                    if (connectTimeoutMillis > 0) {
                        connectTimeoutFuture = eventLoop().schedule(new Runnable() {
                            @Override
                            public void run() {
                                ChannelPromise connectPromise = EpollSocketChannel.this.connectPromise;
                                ConnectTimeoutException cause =
                                        new ConnectTimeoutException("connection timed out: " + remoteAddress);
                                if (connectPromise != null && connectPromise.tryFailure(cause)) {
                                    close(voidPromise());
                                }
                            }
                        }, connectTimeoutMillis, TimeUnit.MILLISECONDS);
                    }

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        ctx.fireChannelRead(msg);
    }


    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        ChannelPromise unvoid = promise.unvoid();
        unvoid.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                lastWriteTime = System.nanoTime();
                firstWriterIdleEvent = firstAllIdleEvent = true;
            }

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            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
                        // IllegalStateException once we try to access the EventLoop of the Channel.
                        promise.setFailure(cause);
                    } else {
                        // Registration was successful, so set the correct executor to use.
                        // See https://github.com/netty/netty/issues/2586
                        promise.executor = channel.eventLoop();
                    }

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    /**
     * Notify all the handshake futures about the successfully handshake
     */
    private void setHandshakeSuccess() {
        for (;;) {
            ChannelPromise p = handshakePromises.poll();
            if (p == null) {
                break;
            }
            p.setSuccess();
        }
    }

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            if (cause == null) {
                cause = new ClosedChannelException();
            }


            for (;;) {
                ChannelPromise p = handshakePromises.poll();
                if (p == null) {
                    break;
                }
                p.setFailure(cause);
            }
        }


        flush0(ctx, 0, cause);
    }

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            return;
        }


        engine.closeOutbound();


        ChannelPromise closeNotifyFuture = ctx.newPromise().addListener(closeNotifyWriteListener);
        flush0(ctx, closeNotifyFuture, true);
        safeClose(ctx, closeNotifyFuture, promise);
    }

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                    int connectTimeoutMillis = config().getConnectTimeoutMillis();
                    if (connectTimeoutMillis > 0) {
                        connectTimeoutFuture = eventLoop().schedule(new Runnable() {
                            @Override
                            public void run() {
                                ChannelPromise connectFuture = connectPromise;
                                ConnectTimeoutException cause =
                                        new ConnectTimeoutException("connection timed out: " + remoteAddress);
                                if (connectFuture != null && connectFuture.tryFailure(cause)) {
                                    close(voidFuture());
                                }
                            }
                        }, connectTimeoutMillis, TimeUnit.MILLISECONDS);
                    }

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