/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 org.apache.catalina.tribes;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.net.StandardSocketOptions;
import java.net.UnknownHostException;
/**
* A simple multicast test that replicates the core elements of Tomcat's
* multicast membership. If this works then multicast membership should work.
* Useful notes for various operating systems follow.<p>
* OSX
* <ul>
* <li>The firewall blocks multicast between processes on the local machine so
* you will need to disable the OSX firewall before the test below will
* work.</li>
* </ul>
* Windows Server 2008
* <ul>
* <li>This works out of the box</li>
* </ul>
*/
public class TesterMulticast {
private static final String ADDRESS = "228.0.0.4";
private static final int PORT = 56565;
private static final InetAddress INET_ADDRESS;
static {
InetAddress result = null;
try {
result = InetAddress.getByName(ADDRESS);
} catch (UnknownHostException e) {
// deal with later
}
INET_ADDRESS = result;
}
public static void main(String[] args) throws Exception {
// Start Rx Thread
Rx rx = new Rx();
Thread rxThread = new Thread(rx);
rxThread.setDaemon(true);
rxThread.start();
// Start Tx Thread
Tx tx = new Tx();
Thread txThread = new Thread(tx);
txThread.setDaemon(true);
txThread.start();
Thread.sleep(10000);
tx.stop();
rx.stop();
}
private static class Rx implements Runnable {
private volatile boolean run = true;
@Override
public void run() {
try (MulticastSocket s = new MulticastSocket(PORT)) {
s.setOption(StandardSocketOptions.IP_MULTICAST_LOOP, Boolean.valueOf(true));
s.joinGroup(new InetSocketAddress(INET_ADDRESS, 0), null);
DatagramPacket p = new DatagramPacket(new byte[4], 4);
p.setAddress(INET_ADDRESS);
p.setPort(PORT);
while (run) {
s.receive(p);
String d = new String (p.getData());
System.out.println("Rx: " + d);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void stop() {
run = false;
}
}
private static class Tx implements Runnable {
private volatile boolean run = true;
@Override
public void run() {
try (MulticastSocket s = new MulticastSocket(PORT)) {
s.setOption(StandardSocketOptions.IP_MULTICAST_LOOP, Boolean.valueOf(true));
s.joinGroup(new InetSocketAddress(INET_ADDRESS, 0), null);
DatagramPacket p = new DatagramPacket(new byte[4], 4);
p.setAddress(INET_ADDRESS);
p.setPort(PORT);
long counter = 0;
String msg;
while (run) {
msg = String.format("%04d", Long.valueOf(counter));
p.setData(msg.getBytes());
System.out.println("Tx: " + msg);
s.send(p);
counter++;
Thread.sleep(500);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void stop() {
run = false;
}
}
}