Example usage for java.nio.channels AsynchronousChannelGroup withThreadPool

Introduction

In this page you can find the example usage for java.nio.channels AsynchronousChannelGroup withThreadPool.

Prototype

public static AsynchronousChannelGroup withThreadPool(ExecutorService executor) throws IOException 

Source Link

Document

Creates an asynchronous channel group with a given thread pool.

Usage

From source file:async.nio2.Main.java

public static void main(String[] args) throws IOException, InterruptedException, ExecutionException {

    if (args.length == 3) {
        PORT = Integer.valueOf(args[0]);
        NO_CLIENTS = Integer.valueOf(args[1]);
        NO_SAMPLES = Integer.valueOf(args[2]);
    }//w  w  w  .  ja  v a 2  s.c  om

    if (PORT < 0) {
        System.err.println("Error: port < 0");
        System.exit(1);
    }

    if (NO_CLIENTS < 1) {
        System.err.println("Error: #clients < 1");
        System.exit(1);
    }

    if (NO_SAMPLES < 1) {
        System.err.println("Error: #samples < 1");
        System.exit(1);
    }

    AsynchronousChannelGroup groupServer = AsynchronousChannelGroup
            .withThreadPool(Executors.newFixedThreadPool(1));
    AsynchronousChannelGroup groupClient = AsynchronousChannelGroup
            .withThreadPool(Executors.newFixedThreadPool(1));

    Server server = Server.newInstance(new InetSocketAddress("localhost", PORT), groupServer);
    InetSocketAddress localAddress = server.getLocalAddress();
    String hostname = localAddress.getHostName();
    int port = localAddress.getPort();

    ExecutorService es = Executors.newFixedThreadPool(2);

    System.out.printf("%03d clients on %s:%d, %03d runs each. All times in s.%n", NO_CLIENTS, hostname, port,
            NO_SAMPLES);
    range(0, NO_CLIENTS).unordered().parallel()
            .mapToObj(i -> CompletableFuture.supplyAsync(newClient(localAddress, groupClient), es).join())
            .map(array -> Arrays.stream(array).reduce(new DescriptiveStatistics(), Main::accumulate,
                    Main::combine))
            .map(Main::toEvaluationString).forEach(System.out::println);

    es.shutdown();
    es.awaitTermination(5, TimeUnit.SECONDS);

    groupClient.shutdown();
    groupClient.awaitTermination(5, TimeUnit.SECONDS);

    server.close();
    groupServer.shutdown();
    groupServer.awaitTermination(5, TimeUnit.SECONDS);
}

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