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Java example source code file (AdaptDatagramSocket.java)

This example Java source code file (AdaptDatagramSocket.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

adaptdatagramsocket, datagramchannel, datagrampacket, datagramsocket, exception, incorrect, inetsocketaddress, net, network, not, random, receive, sockettimeoutexception, string, util

The AdaptDatagramSocket.java Java example source code

/*
 * Copyright (c) 2001, 2013, 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 4313882 4981129
 * @summary Unit test for datagram-socket-channel adaptors
 * @library ..
 */

import java.net.*;
import java.nio.channels.*;
import java.util.*;


public class AdaptDatagramSocket {

    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 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 {
        // 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, 15000, false, false);
        }
        try (TestServers.UdpDiscardServer discardServer
                = TestServers.UdpDiscardServer.startNewServer()) {
            final InetSocketAddress address
                = new InetSocketAddress(discardServer.getAddress(),
                                        discardServer.getPort());
            test(address, 10, true, false);
        }
    }

}

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