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


    /**
     * {@inheritDoc}
     */
    public void start(int port) throws IOException {
        factory = new NioDatagramChannelFactory();
        ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(factory);
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() throws Exception {
                return Channels.pipeline(new SimpleChannelUpstreamHandler() {
                    @Override

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    /**
     * {@inheritedDoc}
     */
    public void start(final int port, final CountDownLatch counter, final byte[] data) throws IOException {
        factory = new NioDatagramChannelFactory();
        ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(factory);
        bootstrap.setOption("sendBufferSize", 65536);
        bootstrap.setOption("receiveBufferSizePredictorFactory", new FixedReceiveBufferSizePredictorFactory(9000));
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() throws Exception {

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   * @return open data-gram channel
   */
  private Channel createRtpChannel(final SocketAddress local, final SocketAddress remote, final RaopRtpChannelType channelType)
  {
    /* Create bootstrap helper for a data-gram socket using NIO */
    final ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(new NioDatagramChannelFactory(m_rtpExecutorService));
    
    /* Set the buffer size predictor to 1500 bytes to ensure that
     * received packets will fit into the buffer. Packets are
     * truncated if they are larger than that!
     */

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    protected void setupUDPCommunication() throws Exception {
        if (datagramChannelFactory == null) {
            int count = configuration.getWorkerCount() > 0 ? configuration.getWorkerCount() : NettyHelper.DEFAULT_IO_THREADS;
            workerPool = new NioDatagramWorkerPool(Executors.newCachedThreadPool(), count);
            datagramChannelFactory = new NioDatagramChannelFactory(workerPool);
        }
    }

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    private static final int SEND_COUNT = 20;
    private int receivedCount;
    private ConnectionlessBootstrap bootstrap;


    public void createNettyUdpReceiver() {
        bootstrap = new ConnectionlessBootstrap(new NioDatagramChannelFactory());
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                ChannelPipeline channelPipeline = Channels.pipeline();
                channelPipeline.addLast("StringDecoder", new StringDecoder(CharsetUtil.UTF_8));

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    private static final int SEND_COUNT = 20;
    private int receivedCount;
    private ConnectionlessBootstrap bootstrap;


    public void createNettyUdpReceiver() {
        bootstrap = new ConnectionlessBootstrap(new NioDatagramChannelFactory());
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                ChannelPipeline channelPipeline = Channels.pipeline();
                channelPipeline.addLast("StringDecoder", new StringDecoder(CharsetUtil.UTF_8));

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  public UDPClient(ChannelHandler businessHandler, IAM iam,String remoteHost, int remotePort,ExecutorService executorService)
  {
    this.iam = iam;
    this.serverAddress = new InetSocketAddress(remoteHost,remotePort);
    DatagramChannelFactory f = new NioDatagramChannelFactory(executorService);
    // Create only one bootstrap per instance. But use it to make multiple udp channels.
    b = new ConnectionlessBootstrap(f);
    ChannelPipeline p = b.getPipeline();
    p.addLast("eventDecoder",EVENT_DECODER);
    p.addLast("businessHandler", businessHandler);

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  @Override
  public Bootstrap createServerBootstrap()
  {
    serverBootstrap = new ConnectionlessBootstrap(
        new NioDatagramChannelFactory(Executors
            .newCachedThreadPool(new NamedThreadFactory(
                "UDP-Server-Worker"))));
    return serverBootstrap;
  }

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    protected void startServerBootstrap() throws UnknownHostException, SocketException {
        // create non-shared worker pool
        int count = configuration.getWorkerCount() > 0 ? configuration.getWorkerCount() : NettyHelper.DEFAULT_IO_THREADS;
        workerPool = new NioDatagramWorkerPool(Executors.newCachedThreadPool(), count);


        datagramChannelFactory = new NioDatagramChannelFactory(workerPool);


        connectionlessBootstrap = new ConnectionlessBootstrap(datagramChannelFactory);
        connectionlessBootstrap.setOption("child.keepAlive", configuration.isKeepAlive());
        connectionlessBootstrap.setOption("child.tcpNoDelay", configuration.isTcpNoDelay());
        connectionlessBootstrap.setOption("reuseAddress", configuration.isReuseAddress());

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    protected void setupUDPCommunication() throws Exception {
        if (datagramChannelFactory == null) {
            int count = configuration.getWorkerCount() > 0 ? configuration.getWorkerCount() : NettyHelper.DEFAULT_IO_THREADS;
            workerPool = new NioDatagramWorkerPool(Executors.newCachedThreadPool(), count);
            datagramChannelFactory = new NioDatagramChannelFactory(workerPool);
        }
    }

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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