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Java example source code file (DatagramMulticastTest.java)

This example Java source code file (DatagramMulticastTest.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

abstractdatagramtest, bootstrap, countdownlatch, datagramchannel, datagrampacket, exception, inetsocketaddress, multicasttesthandler, net, network, object, oiodatagramchannel, override, simplechannelinboundhandler, string, threading, threads, throwable

The DatagramMulticastTest.java Java example source code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.testsuite.transport.socket;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOption;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramChannel;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.oio.OioDatagramChannel;
import io.netty.util.NetUtil;
import org.junit.Test;

import java.net.InetSocketAddress;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import static org.junit.Assert.*;

public class DatagramMulticastTest extends AbstractDatagramTest {

    @Test
    public void testMulticast() throws Throwable {
        run();
    }

    public void testMulticast(Bootstrap sb, Bootstrap cb) throws Throwable {
        MulticastTestHandler mhandler = new MulticastTestHandler();

        sb.handler(new SimpleChannelInboundHandler<Object>() {
            @Override
            public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
                // Nothing will be sent.
            }
        });

        cb.handler(mhandler);

        sb.option(ChannelOption.IP_MULTICAST_IF, NetUtil.LOOPBACK_IF);
        sb.option(ChannelOption.SO_REUSEADDR, true);
        cb.option(ChannelOption.IP_MULTICAST_IF, NetUtil.LOOPBACK_IF);
        cb.option(ChannelOption.SO_REUSEADDR, true);
        cb.localAddress(addr.getPort());

        Channel sc = sb.bind().sync().channel();
        if (sc instanceof OioDatagramChannel) {
            // skip the test for OIO, as it fails because of
            // No route to host which makes no sense.
            // Maybe a JDK bug ?
            sc.close().awaitUninterruptibly();
            return;
        }
        DatagramChannel cc = (DatagramChannel) cb.bind().sync().channel();

        String group = "230.0.0.1";
        InetSocketAddress groupAddress = new InetSocketAddress(group, addr.getPort());

        cc.joinGroup(groupAddress, NetUtil.LOOPBACK_IF).sync();

        sc.writeAndFlush(new DatagramPacket(Unpooled.copyInt(1), groupAddress)).sync();
        assertTrue(mhandler.await());

        // leave the group
        cc.leaveGroup(groupAddress, NetUtil.LOOPBACK_IF).sync();

        // sleep a second to make sure we left the group
        Thread.sleep(1000);

        // we should not receive a message anymore as we left the group before
        sc.writeAndFlush(new DatagramPacket(Unpooled.copyInt(1), groupAddress)).sync();
        mhandler.await();

        sc.close().awaitUninterruptibly();
        cc.close().awaitUninterruptibly();
    }

    private static final class MulticastTestHandler extends SimpleChannelInboundHandler<DatagramPacket> {
        private final CountDownLatch latch = new CountDownLatch(1);

        private boolean done;
        private volatile boolean fail;

        @Override
        protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) throws Exception {
            if (done) {
                fail = true;
            }

            assertEquals(1, msg.content().readInt());

            latch.countDown();

            // mark the handler as done as we only are supposed to receive one message
            done = true;
        }

        public boolean await() throws Exception {
            boolean success = latch.await(10, TimeUnit.SECONDS);
            if (fail) {
                // fail if we receive an message after we are done
                fail();
            }
            return success;
        }
    }
}

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