Examples of com.sun.sgs.nio.channels.AsynchronousChannelGroup

com.sun.sgs.nio.channels.AsynchronousChannelGroup
An organization of asynchronous channels for the purpose of resource sharing.
An asynchronous channel group encapsulates the mechanics required to handle the completion of I/O operations initiated by {@link AsynchronousChannel asynchronous channels} that are bound to thegroup. A group is created with an {@link ExecutorService} to which tasksare submitted to handle I/O events and dispatch to {@link CompletionHandler completion handlers} that consume the result ofasynchronous operations performed on channels in the group.
An asynchronous channel group is created by invoking the {@link #open}method. Channels are bound to a group by specifying the group when the channel is constructed. If a group is not specified then the channel is bound to a default group that is constructed automatically. The executor for the default group is created by invoking the {@link ThreadPoolFactory#newThreadPool() newThreadPool} method on a{@link ThreadPoolFactory} located as follows:
- If the system property {@code java.nio.channels.DefaultThreadPoolFactory} is defined then it istaken to be the fully-qualified name of a concrete thread pool factory class. The class is loaded and instantiated.
- If the system property is not defined, or the process to load and instantiate it fails, then a system-default factory class is instantiated.
Shutdown and Termination
The {@link #shutdown} method is used to initiate anorderly shutdown of the group. An orderly shutdown marks the group as shutdown; further attempts to construct a channel that binds to the group will throw {@link ShutdownChannelGroupException}. Whether or not a group is shutdown can be tested using the {@link #isShutdown}method. Once shutdown, a group terminates when all asynchronous channels that are bound to the group are closed and resources used by the group are released. Once a group is terminated then any actively executing completion handlers run to completion; no attempt is made to stop or interrupt threads that are executing completion handlers. The {@link #isTerminated} method is used to test if the grouphas terminated, and the {@link #awaitTermination} method can be used toblock until the group has terminated.
The {@link #shutdownNow} method can be used to initiate aforceful shutdown of the group. In addition to the actions performed by an orderly shutdown, the {@code shutdownNow} method closesall open channels in the group as if by invoking the {@link AsynchronousChannel#close close} method. A group will typicallyterminate quickly after the {@code shutdownNow} method has been invoked. @see AsynchronousSocketChannel#open(AsynchronousChannelGroup) @see AsynchronousServerSocketChannel#open(AsynchronousChannelGroup) @see AsynchronousDatagramChannel#open(ProtocolFamily,AsynchronousChannelGroup)

        executor.prestartAllCoreThreads();


        AsynchronousChannelProvider provider =
            AsynchronousChannelProvider.provider();


        AsynchronousChannelGroup group =
            provider.openAsynchronousChannelGroup(executor);


        log.log(Level.INFO, "ChannelGroup is a {0}", group.getClass());


        startSignal = new CountDownLatch(NUM_CLIENTS);
        doneSignal = new CountDownLatch(NUM_CLIENTS);


        System.out.format("Connecting %d clients\n", NUM_CLIENTS);


        Set<EchoClient> clients = new HashSet<EchoClient>(NUM_CLIENTS);


        for (int i = 0; i < NUM_CLIENTS; ++i) {
            EchoClient client = new EchoClient(group);
            clients.add(client);
            client.connect();
        }


        startSignal.await();


        System.out.println("Starting test");
        startTime = System.nanoTime();


        for (EchoClient client : clients)
            client.start();


        doneSignal.await();


        long ops = NUM_CLIENTS * NUM_MSGS * 2;
        long elapsed = System.nanoTime() - startTime;
        log.log(Level.INFO, "Bytes read: {0}  written:{1}",
            new Object[] {
                totalBytesRead.get(),
                totalBytesWritten.get()
            });
        System.out.format("%d ops in %d seconds = %d ops/sec\n",
                ops,
                TimeUnit.NANOSECONDS.toSeconds(elapsed),
                TimeUnit.SECONDS.toNanos(ops) / elapsed
            );


        group.shutdown();
        log.info("Awaiting group termination");        
        if (! group.awaitTermination(5, TimeUnit.SECONDS)) {
            log.warning("Forcing group termination");
            group.shutdownNow();
            if (! group.awaitTermination(5, TimeUnit.SECONDS)) {
                log.warning("Group could not be forcibly terminated");
            }
        }
        if (group.isTerminated())
            log.info("Group terminated");


        log.info("Terminating executor");
        executor.shutdown();
        log.info("Awaiting executor termination");

View Full Code Here

        executor.prestartAllCoreThreads();


        AsynchronousChannelProvider provider =
            AsynchronousChannelProvider.provider();


        AsynchronousChannelGroup group =
            provider.openAsynchronousChannelGroup(executor);


        log.log(Level.INFO, "ChannelGroup is a {0}", group.getClass());


        log.info("Starting the server");


        EchoServer server = new EchoServer(group);
        server.start();


        log.info("Awaiting group termination");        
        if (! group.awaitTermination(3600, TimeUnit.SECONDS)) {
            log.warning("Forcing group termination");
            group.shutdownNow();
            if (! group.awaitTermination(5, TimeUnit.SECONDS)) {
                log.warning("Group could not be forcibly terminated");
            }
        }
        if (group.isTerminated())
            log.info("Group terminated");


        log.info("Terminating executor");
        executor.shutdown();
        log.info("Awaiting executor termination");

View Full Code Here

TOP

Related Classes of com.sun.sgs.nio.channels.AsynchronousChannelGroup

com.sun.sgs.test.impl.nio.EchoClient

com.sun.sgs.test.impl.nio.EchoServer

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.

Examples of com.sun.sgs.nio.channels.AsynchronousChannelGroup

Shutdown and Termination

Related Classes of com.sun.sgs.nio.channels.AsynchronousChannelGroup