/*

 * 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

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 */

/* @test

 * @bug 8195160

 * @summary Test asynchronous close during a blocking write

 * @requires (os.family == "linux")

 * @library .. /test/lib

 * @build RsocketTest

 * @run main/othervm CloseDuringWrite

 * @key randomness

 */

import java.io.Closeable;

import java.io.IOException;

import java.net.Inet6Address;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.ProtocolFamily;

import java.net.SocketAddress;

import java.nio.ByteBuffer;

import java.nio.channels.ClosedChannelException;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

import java.util.concurrent.Callable;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;

import java.util.concurrent.ScheduledExecutorService;

import java.util.concurrent.TimeUnit;

import java.util.Random;

import jdk.net.RdmaSockets;

import jtreg.SkippedException;

import static java.net.StandardProtocolFamily.INET;

import static java.net.StandardProtocolFamily.INET6;

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 {

        if (!RsocketTest.isRsocketAvailable())

            throw new SkippedException("rsocket is not available");

        InetAddress lh = InetAddress.getLocalHost();

        ProtocolFamily family = lh instanceof Inet6Address ? INET6 : INET;

        System.out.printf("local address: %s%n", lh);

        ScheduledExecutorService pool = Executors.newSingleThreadScheduledExecutor();

        try (ServerSocketChannel ssc = RdmaSockets.openServerSocketChannel(family)) {

            ssc.bind(new InetSocketAddress(lh, 0));

            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++) {

                System.out.println(i);

                try (SocketChannel source = RdmaSockets.openSocketChannel(family)) {

                    Runnable runnable = new Runnable() {

                        @Override

                        public void run() {

                            try {

                                System.out.println("connecting ...");

                                source.connect(sa);

                                System.out.println("connected");

                            } catch (Exception e) {

                                e.printStackTrace();

                                throw new RuntimeException("Test Failed");

                            }

                        }

                    };

                    Thread t = new Thread(runnable);

                    t.start();

                    try (SocketChannel sink = ssc.accept()) {

                        System.out.println("accepted new connection");

                        // 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();

                        }

                    }

                } catch (Exception e) {

                    e.printStackTrace();

                    throw new RuntimeException("Test Failed");

                }

            }

        } finally {

            pool.shutdown();

        }

    }

}