/*

 * 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 4313882 4981129

 * @summary Unit test for datagram-socket-channel adaptors

 * @library ..

 */

import java.io.*;

import java.net.*;

import java.nio.*;

import java.nio.channels.*;

import java.nio.charset.*;

import java.util.*;

public class AdaptDatagramSocket {

    static java.io.PrintStream out = System.out;

    static Random rand = new Random();

    static final int ECHO_PORT = 7;

    static final int DISCARD_PORT = 9;

    static final String REMOTE_HOST = TestUtil.HOST;

    static final InetSocketAddress echoAddress

        = new InetSocketAddress(REMOTE_HOST, ECHO_PORT);

    static final InetSocketAddress discardAddress

        = new InetSocketAddress(REMOTE_HOST, DISCARD_PORT);

    static String toString(DatagramPacket dp) {

        return ("DatagramPacket[off=" + dp.getOffset()

                + ", len=" + dp.getLength()

                + "]");

    }

    static void test(DatagramSocket ds, InetSocketAddress dst,

                     boolean shouldTimeout)

        throws Exception

    {

        DatagramPacket op = new DatagramPacket(new byte[100], 13, 42, dst);

        rand.nextBytes(op.getData());

        DatagramPacket ip = new DatagramPacket(new byte[100], 19, 100 - 19);

        out.println("pre  op: " + toString(op) + "  ip: " + toString(ip));

        long start = System.currentTimeMillis();

        ds.send(op);

        for (;;) {

            try {

                ds.receive(ip);

                if (ip.getLength() == 0) { // ## Not sure why this happens

                    ip.setLength(100 - 19);

                    continue;

                }

            } catch (SocketTimeoutException x) {

                if (shouldTimeout) {

                    out.println("Receive timed out, as expected");

                    return;

                }

                throw x;

            }

            break;

        }

        out.println("rtt: " + (System.currentTimeMillis() - start));

        out.println("post op: " + toString(op) + "  ip: " + toString(ip));

        for (int i = 0; i < ip.getLength(); i++)

            if (ip.getData()[ip.getOffset() + i]

                != op.getData()[op.getOffset() + i])

                throw new Exception("Incorrect data received");

        if (!(ip.getSocketAddress().equals(dst))) {

            throw new Exception("Incorrect sender address, expected: " + dst

                + " actual: " + ip.getSocketAddress());

        }

    }

    static void test(InetSocketAddress dst,

                     int timeout, boolean shouldTimeout,

                     boolean connect)

        throws Exception

    {

        out.println();

        out.println("dst: " + dst);

        DatagramSocket ds;

        if (false) {

            // Original

            ds = new DatagramSocket();

        } else {

            DatagramChannel dc = DatagramChannel.open();

            ds = dc.socket();

            ds.bind(new InetSocketAddress(0));

        }

        out.println("socket: " + ds);

        if (connect) {

            ds.connect(dst);

            out.println("connect: " + ds);

        }

        InetSocketAddress src = new InetSocketAddress(ds.getLocalAddress(),

                                                      ds.getLocalPort());

        out.println("src: " + src);

        if (timeout > 0)

            ds.setSoTimeout(timeout);

        out.println("timeout: " + ds.getSoTimeout());

        for (int i = 0; i < 5; i++)

            test(ds, dst, shouldTimeout);

        // Leave the socket open so that we don't reuse the old src address

        //ds.close();

    }

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

        test(echoAddress, 0, false, false);

        test(echoAddress, 0, false, true);

        test(echoAddress, 5000, false, false);

        test(discardAddress, 10, true, false);

    }

}