/*

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 * 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 4313882 4981129 8143610 8232673

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

 * @modules java.base/java.net:+open

 * @library .. /test/lib

 * @build jdk.test.lib.Utils TestServers

 * @run main AdaptorBasic

 * @key randomness

 */

import java.net.*;

import java.nio.channels.*;

import java.util.*;

import java.lang.reflect.Field;

public class AdaptorBasic {

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

    static Random rand = new Random();

    static String toString(DatagramPacket dp) {

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

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

                + "]");

    }

    static int getBufLength(DatagramPacket p) throws Exception {

        Field f = DatagramPacket.class.getDeclaredField("bufLength");

        f.setAccessible(true);

        return (int) f.get(p);

    }

    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());

        int bufLength = 100 - 19;

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

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

        long start = System.currentTimeMillis();

        ds.send(op);

        for (;;) {

            try {

                ds.receive(ip);

            } 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());

        }

        if (getBufLength(ip) != bufLength) {

            throw new Exception("DatagramPacket bufLength changed by receive!!!");

        }

    }

    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 {

        // need an UDP echo server

        try (TestServers.UdpEchoServer echoServer

                = TestServers.UdpEchoServer.startNewServer(100)) {

            final InetSocketAddress address

                = new InetSocketAddress(echoServer.getAddress(),

                                        echoServer.getPort());

            test(address, 0, false, false);

            test(address, 0, false, true);

            test(address, Integer.MAX_VALUE, false, false);

        }

        try (TestServers.UdpDiscardServer discardServer

                = TestServers.UdpDiscardServer.startNewServer()) {

            final InetSocketAddress address

                = new InetSocketAddress(discardServer.getAddress(),

                                        discardServer.getPort());

            test(address, 10, true, false);

        }

    }

}