/*

 * Copyright (c) 2012, 2017, 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.

 *

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 */

/* @test

 * @bug 7132924

 * @key intermittent

 * @summary Test DatagramChannel.disconnect when DatagramChannel is connected to an IPv4 socket

 * @run main Disconnect

 * @run main/othervm -Djava.net.preferIPv4Stack=true Disconnect

 */

import java.net.*;

import java.nio.*;

import java.nio.channels.*;

import java.io.IOException;

public class Disconnect {

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

        // test with default protocol family

        try (DatagramChannel dc = DatagramChannel.open()) {

            test(dc);

            test(dc);

        }

        // test with IPv4 only

        try (DatagramChannel dc = DatagramChannel.open(StandardProtocolFamily.INET)) {

            test(dc);

            test(dc);

        }

    }

    /**

     * Connect DatagramChannel to a server, write a datagram and disconnect. Invoke

     * a second or subsequent time with the same DatagramChannel instance to check

     * that disconnect works as expected.

     */

    static void test(DatagramChannel dc) throws IOException {

        try (DatagramChannel server = DatagramChannel.open()) {

            server.bind(new InetSocketAddress(0));

            InetAddress lh = InetAddress.getLocalHost();

            dc.connect(new InetSocketAddress(lh, server.socket().getLocalPort()));

            dc.write(ByteBuffer.wrap("hello".getBytes()));

            ByteBuffer bb = ByteBuffer.allocate(100);

            server.receive(bb);

            dc.disconnect();

            try {

                dc.write(ByteBuffer.wrap("another message".getBytes()));

                throw new RuntimeException("write should fail, not connected");

            } catch (NotYetConnectedException expected) {

            }

        }

    }

}