/*

 * Copyright (c) 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

 * @run main UdpSocket

 * @run main/othervm -Djdk.net.usePlainSocketImpl UdpSocket

 * @summary Basic test for a Socket to a UDP socket

 */

import java.io.IOException;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.Socket;

import java.net.SocketAddress;

import java.nio.ByteBuffer;

import java.nio.channels.DatagramChannel;

import java.util.Arrays;

public class UdpSocket {

    static final String MESSAGE = "hello";

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

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

            var loopback = InetAddress.getLoopbackAddress();

            dc.bind(new InetSocketAddress(loopback, 0));

            int port = ((InetSocketAddress) dc.getLocalAddress()).getPort();

            try (Socket s = new Socket(loopback, port, false)) {

                // send datagram with socket output stream

                byte[] array1 = MESSAGE.getBytes("UTF-8");

                s.getOutputStream().write(array1);

                // receive the datagram

                var buf = ByteBuffer.allocate(100);

                SocketAddress remote = dc.receive(buf);

                buf.flip();

                if (buf.remaining() != MESSAGE.length())

                    throw new RuntimeException("Unexpected size");

                // echo the datagram

                dc.send(buf, remote);

                // receive datagram with the socket input stream

                byte[] array2 = new byte[100];

                int n = s.getInputStream().read(array2);

                if (n != MESSAGE.length())

                    throw new RuntimeException("Unexpected size");

                if (!Arrays.equals(array1, 0, n, array2, 0, n))

                    throw new RuntimeException("Unexpected contents");

            }

        }

    }

}