jdk/test/java/nio/channels/AsynchronousChannelGroup/Unbounded.java
author alanb
Tue, 29 Jun 2010 17:11:12 +0100
changeset 5983 b5bc332cd233
parent 5506 202f599c92aa
child 14501 10121b56420c
permissions -rw-r--r--
6213702: (so) non-blocking sockets with TCP urgent disabled get still selected for read ops (win) Reviewed-by: michaelm, chegar
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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 * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/* @test
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 * @bug 4607272 6842687
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 * @summary Unit test for AsynchronousChannelGroup
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 */
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import java.nio.ByteBuffer;
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import java.nio.channels.*;
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import java.net.*;
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import java.util.concurrent.*;
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import java.io.IOException;
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public class Unbounded {
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    // number of concurrent completion handlers
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    static final int CONCURRENCY_COUNT = 256;
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    public static void main(String[] args) throws Exception {
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        // all accepted connections are added to a queue
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        final ArrayBlockingQueue<AsynchronousSocketChannel> queue =
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            new ArrayBlockingQueue<AsynchronousSocketChannel>(CONCURRENCY_COUNT);
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        // create listener to accept connections
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        final AsynchronousServerSocketChannel listener =
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            AsynchronousServerSocketChannel.open()
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                .bind(new InetSocketAddress(0));
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        listener.accept((Void)null, new CompletionHandler<AsynchronousSocketChannel,Void>() {
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            public void completed(AsynchronousSocketChannel ch, Void att) {
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                queue.add(ch);
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                listener.accept((Void)null, this);
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            }
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            public void failed(Throwable exc, Void att) {
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            }
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        });
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        System.out.println("Listener created.");
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        // establish lots of connections
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        int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort();
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        SocketAddress sa = new InetSocketAddress(InetAddress.getLocalHost(), port);
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        AsynchronousSocketChannel[] channels =
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            new AsynchronousSocketChannel[CONCURRENCY_COUNT];
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        for (int i=0; i<CONCURRENCY_COUNT; i++) {
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            int attempts = 0;
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            for (;;) {
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                try {
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                    channels[i] = AsynchronousSocketChannel.open();
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                    channels[i].connect(sa).get();
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                    break;
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                } catch (IOException x) {
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                    // probably resource issue so back off and retry
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                    if (++attempts >= 3)
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                        throw x;
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                    Thread.sleep(50);
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                }
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            }
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        }
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        System.out.println("All connection established.");
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        // the barrier where all threads (plus the main thread) wait
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        final CyclicBarrier barrier = new CyclicBarrier(CONCURRENCY_COUNT+1);
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        // initiate a read operation on each channel.
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        for (int i=0; i<CONCURRENCY_COUNT; i++) {
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            ByteBuffer buf = ByteBuffer.allocateDirect(100);
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            channels[i].read( buf, channels[i],
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                new CompletionHandler<Integer,AsynchronousSocketChannel>() {
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                    public void completed(Integer bytesRead, AsynchronousSocketChannel ch) {
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                        try {
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                            ch.close();
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                            barrier.await();
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                        } catch (Exception x) {
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                            throw new AssertionError(x);
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                        }
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                    }
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                    public void failed(Throwable exc, AsynchronousSocketChannel ch) {
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                    }
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                });
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        }
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        System.out.println("All read operations outstanding.");
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        // write data to each of the accepted connections
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        int remaining = CONCURRENCY_COUNT;
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        while (remaining > 0) {
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            AsynchronousSocketChannel ch = queue.take();
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            ch.write(ByteBuffer.wrap("welcome".getBytes())).get();
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            ch.close();
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            remaining--;
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        }
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        // wait for all threads to reach the barrier
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        System.out.println("Waiting for all threads to reach barrier");
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        barrier.await();
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        listener.close();
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    }
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}