Examples of org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory

Package org.jboss.netty.channel.socket.nio

Examples of org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory

org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory
A {@link DatagramChannelFactory} that creates a NIO-based connectionless{@link DatagramChannel}. It utilizes the non-blocking I/O mode which was introduced with NIO to serve many number of concurrent connections efficiently.
How threads work

There is only one thread type in a {@link NioDatagramChannelFactory}; worker threads.
Worker threads

One {@link NioDatagramChannelFactory} can have one or more workerthreads. A worker thread performs non-blocking read and write for one or more {@link DatagramChannel}s in a non-blocking mode.
Life cycle of threads and graceful shutdown

All worker threads are acquired from the {@link Executor} which was specifiedwhen a {@link NioDatagramChannelFactory} was created. Therefore, you shouldmake sure the specified {@link Executor} is able to lend the sufficientnumber of threads. It is the best bet to specify {@linkplain Executors#newCachedThreadPool() a cached thread pool}.
All worker threads are acquired lazily, and then released when there's nothing left to process. All the related resources such as {@link Selector}are also released when the worker threads are released. Therefore, to shut down a service gracefully, you should do the following:
1. close all channels created by the factory usually using {@link ChannelGroup#close()}, and
2. call {@link #releaseExternalResources()}.
Please make sure not to shut down the executor until all channels are closed. Otherwise, you will end up with a {@link RejectedExecutionException}and the related resources might not be released properly.
Limitation

Multicast is not supported. Please use {@link OioDatagramChannelFactory}instead. @author The Netty Project (netty-dev@lists.jboss.org) @author Trustin Lee (tlee@redhat.com) @author Daniel Bevenius (dbevenius@jboss.com) @version $Rev: 1580 $, $Date: 2009-07-17 21:49:32 +0900 (Fri, 17 Jul 2009) $ @apiviz.landmark


    protected void setupUDPCommunication() throws Exception {
        if (datagramChannelFactory == null) {
            workerExecutor = context.getExecutorServiceManager().newCachedThreadPool(this, "NettyUDPWorker");
            if (configuration.getWorkerCount() <= 0) {
                datagramChannelFactory = new NioDatagramChannelFactory(workerExecutor);
            } else {
                datagramChannelFactory = new NioDatagramChannelFactory(workerExecutor, configuration.getWorkerCount());
            }
        }
    }

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    }


    private void initializeUDPServerSocketCommunicationLayer() throws Exception {
        workerExecutor = context.getExecutorServiceManager().newCachedThreadPool(this, "NettyUDPWorker");
        if (configuration.getWorkerCount() <= 0) {
            datagramChannelFactory = new NioDatagramChannelFactory(workerExecutor);
        } else {
            datagramChannelFactory = new NioDatagramChannelFactory(workerExecutor, configuration.getWorkerCount());
        }
        connectionlessServerBootstrap = new ConnectionlessBootstrap(datagramChannelFactory);
        connectionlessServerBootstrap.setOption("child.keepAlive", configuration.isKeepAlive());
        connectionlessServerBootstrap.setOption("child.tcpNoDelay", configuration.isTcpNoDelay());
        connectionlessServerBootstrap.setOption("reuseAddress", configuration.isReuseAddress());

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        ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(numberOfThreads, threadFactory);
        executor.setRemoveOnCancelPolicy(true);
        this.executor = executor;


        //Create bootstrap
        ChannelFactory channelFactory = new NioDatagramChannelFactory(this.executor, numberOfThreads/2);
        ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(channelFactory);


        ServerChannelPipelineFactory pipelineFactory =
                new ServerChannelPipelineFactory(this.executor, webServiceNotFoundHandler);

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        this.exeutor.setRemoveOnCancelPolicy(true);


        TokenFactory tokenFactory = new TokenFactory(maxTokenLength);


        //Create factories for channel and pipeline
        ChannelFactory channelFactory = new NioDatagramChannelFactory(exeutor, threads/2);
        ClientChannelPipelineFactory clientChannelPipelineFactory =
                new ClientChannelPipelineFactory(exeutor, tokenFactory);


        //Create and configure bootstrap
        ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(channelFactory);

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                log.error("Execution rejected!");
            }
        });


        //Create datagram datagramChannel to receive and send messages
        ChannelFactory channelFactory = new NioDatagramChannelFactory(executor);


        ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(channelFactory);
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {


            @Override

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  public static void main(String[] args) throws Exception {
    logger.info("Starting BitTorrent UDP tracker...");


    Executor threadPool = Executors.newCachedThreadPool();
    DatagramChannelFactory factory = new NioDatagramChannelFactory(threadPool);


    bootstrap = new ConnectionlessBootstrap(factory);
    bootstrap.getPipeline().addLast("handler", new Handler());


    /**

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Examples of org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory

How threads work

Worker threads

Life cycle of threads and graceful shutdown

Limitation

Related Classes of org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory