135 lines
4.0 KiB
Java
135 lines
4.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.catalina.tribes;
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import java.net.DatagramPacket;
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import java.net.InetAddress;
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import java.net.MulticastSocket;
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import java.net.UnknownHostException;
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/**
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* A simple multicast test that replicates the core elements of Tomcat's
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* multicast membership. If this works then multicast membership should work.
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* Useful notes for various operating systems follow.<p>
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* OSX
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* <ul>
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* <li>The firewall blocks multicast between processes on the local machine so
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* you will need to disable the OSX firewall before the test below will
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* work.</li>
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* </ul>
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* Windows Server 2008
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* <ul>
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* <li>This works out of the box</li>
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* </ul>
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*/
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public class TesterMulticast {
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private static final String ADDRESS = "228.0.0.4";
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private static final int PORT = 56565;
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private static final InetAddress INET_ADDRESS;
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static {
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InetAddress result = null;
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try {
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result = InetAddress.getByName(ADDRESS);
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} catch (UnknownHostException e) {
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// deal with later
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}
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INET_ADDRESS = result;
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}
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public static void main(String[] args) throws Exception {
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// Start Rx Thread
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Rx rx = new Rx();
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Thread rxThread = new Thread(rx);
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rxThread.setDaemon(true);
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rxThread.start();
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// Start Tx Thread
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Tx tx = new Tx();
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Thread txThread = new Thread(tx);
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txThread.setDaemon(true);
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txThread.start();
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Thread.sleep(10000);
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tx.stop();
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rx.stop();
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}
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private static class Rx implements Runnable {
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private volatile boolean run = true;
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@Override
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public void run() {
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try (MulticastSocket s = new MulticastSocket(PORT)) {
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s.setLoopbackMode(false);
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s.joinGroup(INET_ADDRESS);
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DatagramPacket p = new DatagramPacket(new byte[4], 4);
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p.setAddress(INET_ADDRESS);
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p.setPort(PORT);
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while (run) {
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s.receive(p);
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String d = new String (p.getData());
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System.out.println("Rx: " + d);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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public void stop() {
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run = false;
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}
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}
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private static class Tx implements Runnable {
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private volatile boolean run = true;
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@Override
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public void run() {
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try (MulticastSocket s = new MulticastSocket(PORT)) {
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s.setLoopbackMode(false);
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s.joinGroup(INET_ADDRESS);
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DatagramPacket p = new DatagramPacket(new byte[4], 4);
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p.setAddress(INET_ADDRESS);
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p.setPort(PORT);
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long counter = 0;
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String msg;
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while (run) {
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msg = String.format("%04d", Long.valueOf(counter));
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p.setData(msg.getBytes());
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System.out.println("Tx: " + msg);
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s.send(p);
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counter++;
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Thread.sleep(500);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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public void stop() {
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run = false;
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}
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}
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}
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