/*

 * Copyright (c) 2001, 2019, 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

 * @bug 4424096

 * @summary DatagramPacket spec needs clarification (reuse buf)

 */

import java.net.*;

public class ReuseBuf {

    static String msgs[] = {"Hello World", "Java", "Good Bye"};

    static int port;

    static class ServerThread extends Thread{

        DatagramSocket ds;

        public ServerThread() {

            try {

                InetAddress local = InetAddress.getLocalHost();

                InetSocketAddress bindaddr = new InetSocketAddress(local, 0);

                ds = new DatagramSocket(bindaddr);

                port = ds.getLocalPort();

            } catch (Exception e) {

                throw new RuntimeException(e.getMessage());

            }

        }

        public void run() {

            byte b[] = new byte[100];

            DatagramPacket dp = new DatagramPacket(b,b.length);

            while (true) {

                try {

                    ds.receive(dp);

                    String reply = new String(dp.getData(), dp.getOffset(), dp.getLength());

                    if (reply.equals(msgs[msgs.length-1])) {

                        break;

                    }

                } catch (Exception e) {

                    throw new RuntimeException(e.getMessage());

                }

            }

            ds.close();

        }

    }

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

        ServerThread st = new ServerThread();

        st.start();

        InetAddress local = InetAddress.getLocalHost();

        InetSocketAddress bindaddr = new InetSocketAddress(local, 0);

        DatagramSocket ds = new DatagramSocket(bindaddr);

        byte b[] = new byte[100];

        DatagramPacket dp = new DatagramPacket(b,b.length);

        for (int i = 0; i < msgs.length; i++) {

            ds.send(new DatagramPacket(msgs[i].getBytes(),msgs[i].length(),

                                       InetAddress.getLocalHost(),

                                       port));

            ds.receive(dp);

            }

        }

        ds.close();

    }

}