/*

 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

 * @summary Test asynchronous close during a blocking write

 * @key randomness

 */

import java.io.Closeable;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.*;

import java.net.*;

import java.util.concurrent.*;

import java.util.Random;

public class CloseDuringWrite {

    static final Random rand = new Random();

    /**

     * A task that closes a Closeable

     */

    static class Closer implements Callable<Void> {

        final Closeable c;

        Closer(Closeable c) {

            this.c = c;

        }

        public Void call() throws IOException {

            c.close();

            return null;

        }

    }

    public static void main(String[] args) throws Exception {

        ScheduledExecutorService pool = Executors.newSingleThreadScheduledExecutor();

        try {

            try (ServerSocketChannel ssc = ServerSocketChannel.open()) {

                ssc.bind(new InetSocketAddress(0));

                InetAddress lh = InetAddress.getLocalHost();

                int port = ssc.socket().getLocalPort();

                SocketAddress sa = new InetSocketAddress(lh, port);

                ByteBuffer bb = ByteBuffer.allocate(2*1024*1024);

                for (int i=0; i<20; i++) {

                    try (SocketChannel source = SocketChannel.open(sa);

                         SocketChannel sink = ssc.accept())

                    {

                        // schedule channel to be closed

                        Closer c = new Closer(source);

                        int when = 1000 + rand.nextInt(2000);

                        Future<Void> result = pool.schedule(c, when, TimeUnit.MILLISECONDS);

                        // the write should either succeed or else throw a

                        // ClosedChannelException (more likely an

                        // AsynchronousCloseException)

                        try {

                            for (;;) {

                                int limit = rand.nextInt(bb.capacity());

                                bb.position(0);

                                bb.limit(limit);

                                int n = source.write(bb);

                                System.out.format("wrote %d, expected %d%n", n, limit);

                            }

                        } catch (ClosedChannelException expected) {

                            System.out.println(expected + " (expected)");

                        } finally {

                            result.get();

                        }

                    }

                }

            }

        } finally {

            pool.shutdown();

        }

    }

}