ActiveMQ example source code file (AMQ2183Test.java)

This example ActiveMQ source code file (AMQ2183Test.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

activemqconnectionfactory, activemqqueue, brokerservice, brokerservice, countdownlatch, countdownlatch, exception, exception, io, ioexception, messagecounter, messagecounter, messagelistener, net, network, thread, threading, threads, throwable, util

The ActiveMQ AMQ2183Test.java source code

/**
 * 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.activemq.bugs;


import java.io.IOException;
import java.lang.Thread.UncaughtExceptionHandler;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.AutoFailTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.util.Wait;
import org.apache.activemq.util.Wait.Condition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AMQ2183Test extends AutoFailTestSupport implements UncaughtExceptionHandler, MessageListener {
       
    private static final Logger LOG = LoggerFactory.getLogger(AMQ2183Test.class);
    private static final int maxSent = 2000;    
    private final Map<Thread, Throwable> exceptions = new ConcurrentHashMap();

    BrokerService master = new BrokerService();
    BrokerService slave = new BrokerService();
    URI masterUrl, slaveUrl;

    public void onException(JMSException e) {
        exceptions.put(Thread.currentThread(), e);
    }
    
    public void setUp() throws Exception {
        setAutoFail(true);
        super.setUp();
        master = new BrokerService();
        slave = new BrokerService();
        
        master.setBrokerName("Master");
        master.addConnector("tcp://localhost:0");
        master.deleteAllMessages();
        master.setWaitForSlave(true);
        
        Thread t = new Thread() {
            public void run() {
                try {
                    master.start();
                } catch (Exception e) {
                    e.printStackTrace();
                    exceptions.put(Thread.currentThread(), e);
                }
            }
        };
        t.start();
        Thread.sleep(2000);
        masterUrl = master.getTransportConnectors().get(0).getConnectUri();
    }

    private void startSlave() throws IOException, Exception, URISyntaxException {
        slave.setBrokerName("Slave");
        slave.deleteAllMessages();
        slave.addConnector("tcp://localhost:0");
        slave.setMasterConnectorURI(masterUrl.toString());
        slave.start();
        slaveUrl = slave.getTransportConnectors().get(0).getConnectUri();
    }
    
    public void tearDown() throws Exception {
        master.stop();
        slave.stop();
        exceptions.clear();
    }
    
    class MessageCounter implements MessageListener {
        int count = 0;
        public void onMessage(Message message) {
            count++;
        }
        
        int getCount() {
            return count;
        }
    }
    
    public void testMasterSlaveBugWithStopStartConsumers() throws Exception {

        Thread.setDefaultUncaughtExceptionHandler(this);
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(
                "failover:(" + masterUrl + ")?randomize=false");
    
        final Connection connection = connectionFactory.createConnection();
        final CountDownLatch startCommenced = new CountDownLatch(1);
        final CountDownLatch startDone = new CountDownLatch(1);
        
        // start will be blocked pending slave connection but should resume after slave started
        Executors.newSingleThreadExecutor().execute(new Runnable() {
            public void run() {
                startCommenced.countDown();
                try {
                    connection.start();
                    startDone.countDown();
                } catch (Exception e) {
                    exceptions.put(Thread.currentThread(), e);
                }
            }});
        
       
        assertTrue("connection.start has commenced", startCommenced.await(10, TimeUnit.SECONDS));
        startSlave();
        assertTrue("connection.start done", startDone.await(70, TimeUnit.SECONDS));
        
        final MessageCounter counterA = new MessageCounter();
        connection.createSession(false, Session.AUTO_ACKNOWLEDGE).createConsumer(new ActiveMQQueue("Consumer.A.VirtualTopic.T")).setMessageListener(counterA);
       
        final MessageCounter counterB = new MessageCounter();
        connection.createSession(false, Session.AUTO_ACKNOWLEDGE).createConsumer(new ActiveMQQueue("Consumer.B.VirtualTopic.T")).setMessageListener(counterB);
       
        Thread.sleep(2000);
        
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(new ActiveMQTopic("VirtualTopic.T"));
        for (int i=0; i<maxSent; i++) {
            producer.send(session.createTextMessage("Hi" + i));
        }
        
        Wait.waitFor(new Condition() {
            public boolean isSatisified() throws Exception {
                return maxSent == counterA.getCount() && maxSent == counterB.getCount();
            }
        });
        assertEquals(maxSent, counterA.getCount());
        assertEquals(maxSent, counterB.getCount());
        assertTrue(exceptions.isEmpty());
    }


    public void uncaughtException(Thread t, Throwable e) {
        exceptions.put(t,e);
    }

    public void onMessage(Message message) {
        LOG.info("message received: " + message);        
    }
}