Examples of io.netty.channel.socket.nio.NioDatagramChannelFactory

io.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. @apiviz.landmark

        this.port = port;
    }


    public void run() {
        DatagramChannelFactory f =
            new NioDatagramChannelFactory(Executors.newCachedThreadPool());


        ConnectionlessBootstrap b = new ConnectionlessBootstrap(f);


        // Configure the pipeline factory.
        b.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() throws Exception {
                return Channels.pipeline(
                        new StringEncoder(CharsetUtil.ISO_8859_1),
                        new StringDecoder(CharsetUtil.ISO_8859_1),
                        new QuoteOfTheMomentClientHandler());
            }
        });


        // Enable broadcast
        b.setOption("broadcast", "true");


        // Allow packets as large as up to 1024 bytes (default is 768).
        // You could increase or decrease this value to avoid truncated packets
        // or to improve memory footprint respectively.
        //
        // Please also note that a large UDP packet might be truncated or
        // dropped by your router no matter how you configured this option.
        // In UDP, a packet is truncated or dropped if it is larger than a
        // certain size, depending on router configuration.  IPv4 routers
        // truncate and IPv6 routers drop a large packet.  That's why it is
        // safe to send small packets in UDP.
        b.setOption(
                "receiveBufferSizePredictorFactory",
                new FixedReceiveBufferSizePredictorFactory(1024));


        DatagramChannel c = (DatagramChannel) b.bind(new InetSocketAddress(0));


        // Broadcast the QOTM request to port 8080.
        c.write("QOTM?", new InetSocketAddress("255.255.255.255", port));


        // QuoteOfTheMomentClientHandler will close the DatagramChannel when a
        // response is received.  If the channel is not closed within 5 seconds,
        // print an error message and quit.
        if (!c.getCloseFuture().awaitUninterruptibly(5000)) {
            System.err.println("QOTM request timed out.");
            c.close().awaitUninterruptibly();
        }


        f.releaseExternalResources();
    }

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        this.port = port;
    }


    public void run() {
        DatagramChannelFactory f =
            new NioDatagramChannelFactory(Executors.newCachedThreadPool());


        ConnectionlessBootstrap b = new ConnectionlessBootstrap(f);


        // Configure the pipeline factory.
        b.setPipelineFactory(new ChannelPipelineFactory() {

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Related Classes of io.netty.channel.socket.nio.NioDatagramChannelFactory

io.netty.example.qotm.QuoteOfTheMomentClient

io.netty.example.qotm.QuoteOfTheMomentServer

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Examples of io.netty.channel.socket.nio.NioDatagramChannelFactory

How threads work

Worker threads

Life cycle of threads and graceful shutdown

Limitation

Related Classes of io.netty.channel.socket.nio.NioDatagramChannelFactory