Examples of org.jboss.netty.channel.ChannelFuture

org.jboss.netty.channel.ChannelFuture
The result of an asynchronous {@link Channel} I/O operation.
All I/O operations in Netty are asynchronous. It means any I/O calls will return immediately with no guarantee that the requested I/O operation has been completed at the end of the call. Instead, you will be returned with a {@link ChannelFuture} instance which tells you when the requested I/Ooperation has succeeded, failed, or cancelled.
Various methods are provided to let you check if the I/O operation has been completed, wait for the completion, and retrieve the result of the I/O operation. It also allows you to add more than one {@link ChannelFutureListener}so you can get notified when the I/O operation has been completed. @author The Netty Project (netty-dev@lists.jboss.org) @author Trustin Lee (tlee@redhat.com) @version $Rev: 987 $, $Date: 2009-03-04 23:27:20 +0900 (Wed, 04 Mar 2009) $ @apiviz.landmark @apiviz.owns org.jboss.netty.channel.ChannelFutureListener - - notifies


        // Finally, write the Subscribe request through the Channel.
        if (logger.isDebugEnabled())
            logger.debug("Writing a SubUnsub request to host: " + HedwigClientImpl.getHostFromChannel(channel)
                         + " for pubSubData: " + pubSubData);
        ChannelFuture future = channel.write(pubsubRequestBuilder.build());
        future.addListener(new WriteCallback(pubSubData, client));
    }

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        // action. Instead, just have a future listener that will log an error
        // message if there was a problem writing the consume request.
        if (logger.isDebugEnabled())
            logger.debug("Writing a Consume request to host: " + HedwigClientImpl.getHostFromChannel(channel)
                         + " with messageSeqId: " + messageSeqId + " for pubSubData: " + pubSubData);
        ChannelFuture future = channel.write(pubsubRequestBuilder.build());
        future.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (!future.isSuccess()) {
                    logger.error("Error writing a Consume request to host: " + HedwigClientImpl.getHostFromChannel(channel)
                                 + " with messageSeqId: " + messageSeqId + " for pubSubData: " + pubSubData);
                }
            }
        });

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        .setMessageHandler(messageHandler);
        // Now make the TopicSubscriber Channel readable (it is set to not be
        // readable when the initial subscription is done). Note that this is an
        // asynchronous call. If this fails (not likely), the futureListener
        // will just log an error message for now.
        ChannelFuture future = topicSubscriberChannel.setReadable(true);
        future.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (!future.isSuccess()) {
                    logger.error("Unable to make subscriber Channel readable in startDelivery call for topic: "
                                 + topic.toStringUtf8() + ", subscriberId: " + subscriberId.toStringUtf8());
                }
            }
        });

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        .setMessageHandler(null);
        // Now make the TopicSubscriber channel not-readable. This will buffer
        // up messages if any are sent from the server. Note that this is an
        // asynchronous call. If this fails (not likely), the futureListener
        // will just log an error message for now.
        ChannelFuture future = topicSubscriberChannel.setReadable(false);
        future.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (!future.isSuccess()) {
                    logger.error("Unable to make subscriber Channel not readable in stopDelivery call for topic: "
                                 + topic.toStringUtf8() + ", subscriberId: " + subscriberId.toStringUtf8());
                }
            }
        });

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            // Remove all cached references for the TopicSubscriber
            Channel channel = topicSubscriber2Channel.get(topicSubscriber);
            topicSubscriber2Channel.remove(topicSubscriber);
            // Close the subscribe channel asynchronously.
            HedwigClientImpl.getResponseHandlerFromChannel(channel).channelClosedExplicitly = true;
            ChannelFuture future = channel.close();
            future.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    if (!future.isSuccess()) {
                        logger.error("Failed to close the subscription channel for topic: " + topic.toStringUtf8()
                                     + ", subscriberId: " + subscriberId.toStringUtf8());
                        callback.operationFailed(context, new ServiceDownException(
                                                     "Failed to close the subscription channel for topic: " + topic.toStringUtf8()
                                                     + ", subscriberId: " + subscriberId.toStringUtf8()));

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        bootstrap.setPipelineFactory(pipelineFactory);
        bootstrap.setOption("tcpNoDelay", true);
        bootstrap.setOption("keepAlive", true);


        // Start the connection attempt to the input server host.
        ChannelFuture future = bootstrap.connect(serverHost);
        future.addListener(new ConnectCallback(pubSubData, serverHost, this));
    }

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        ClientBootstrap bootstrap = new ClientBootstrap(channelFactory);
        bootstrap.setPipelineFactory(this);
        bootstrap.setOption("tcpNoDelay", conf.getClientTcpNoDelay());
        bootstrap.setOption("keepAlive", true);


        ChannelFuture future = bootstrap.connect(addr);


        future.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                int rc;
                Queue<GenericCallback<Void>> oldPendingOps;


                synchronized (PerChannelBookieClient.this) {


                    if (future.isSuccess()) {
                        LOG.info("Successfully connected to bookie: " + addr);
                        rc = BKException.Code.OK;
                        channel = future.getChannel();
                        state = ConnectionState.CONNECTED;
                    } else {
                        LOG.error("Could not connect to bookie: " + addr);
                        rc = BKException.Code.BookieHandleNotAvailableException;
                        channel = null;

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                                         BookieProtocol.ADDENTRY, (short)options).toInt());
        header.writeBytes(masterKey);


        ChannelBuffer wrappedBuffer = ChannelBuffers.wrappedBuffer(header, toSend);


        ChannelFuture future = channel.write(wrappedBuffer);
        future.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (future.isSuccess()) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Successfully wrote request for adding entry: " + entryId + " ledger-id: " + ledgerId
                                  + " bookie: " + channel.getRemoteAddress() + " entry length: " + entrySize);
                    }
                    // totalBytesOutstanding.addAndGet(entrySize);

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        tmpEntry.writeInt(new PacketHeader(BookieProtocol.CURRENT_PROTOCOL_VERSION, 
                                           BookieProtocol.READENTRY, (short)options).toInt());
        tmpEntry.writeLong(ledgerId);
        tmpEntry.writeLong(entryId);


        ChannelFuture future = channel.write(tmpEntry);
        future.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (future.isSuccess()) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Successfully wrote request for reading entry: " + entryId + " ledger-id: "
                                  + ledgerId + " bookie: " + channel.getRemoteAddress());
                    }
                } else {

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                    PubSubResponse response = PubSubResponse.newBuilder().setProtocolVersion(
                                                  ProtocolVersion.VERSION_ONE).setStatusCode(StatusCode.SUCCESS).setTxnId(0).setMessage(msg)
                                              .setTopic(topic).setSubscriberId(subscriberId).build();


                    ChannelFuture future = subscribedChannel.write(response);


                    future.addListener(new ChannelFutureListener() {
                        @Override
                        public void operationComplete(ChannelFuture future) throws Exception {
                            if (!future.isSuccess()) {
                                // ignoring this failure, because this will
                                // only happen due to channel disconnect.
                                // Channel disconnect will in turn stop
                                // delivery, and stop these errors
                                return;

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