ActiveMQ example source code file (AMQ2021Test.java)

This example ActiveMQ source code file (AMQ2021Test.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, activemqconnectionfactory, connection, consumerthread, consumerthread, countdownlatch, countdownlatch, exception, exception, jmsexception, override, session, thread, threading, threads, throwable, util

The ActiveMQ AMQ2021Test.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.lang.Thread.UncaughtExceptionHandler;
import java.util.ArrayList;
import java.util.Vector;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import javax.jms.Connection;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import junit.framework.TestCase;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This is a test case for the issue reported at:
 * https://issues.apache.org/activemq/browse/AMQ-2021 
 * Bug is modification of inflight message properties so the failure can manifest itself in a bunch
 * or ways, from message receipt with null properties to marshall errors
 */
public class AMQ2021Test extends TestCase implements ExceptionListener, UncaughtExceptionHandler {

    private static final Logger log = LoggerFactory.getLogger(AMQ2021Test.class);
    BrokerService brokerService;
    ArrayList<Thread> threads = new ArrayList();
    Vector<Throwable> exceptions;
    
    AMQ2021Test testCase;
    
    String ACTIVEMQ_BROKER_BIND = "tcp://localhost:61616";    
    String ACTIVEMQ_BROKER_URL = ACTIVEMQ_BROKER_BIND + "?jms.redeliveryPolicy.maximumRedeliveries=1&jms.redeliveryPolicy.initialRedeliveryDelay=0";
    
    private int numMessages = 1000;
    private int numConsumers = 2;
    private int dlqMessages = numMessages/2;
    
    CountDownLatch receivedLatch;
    private ActiveMQTopic destination;
    public CountDownLatch started;

    @Override
    protected void setUp() throws Exception {
        Thread.setDefaultUncaughtExceptionHandler(this);
        testCase = this;
        
        // Start an embedded broker up.
        brokerService = new BrokerService();
        brokerService.setDeleteAllMessagesOnStartup(true);
        brokerService.addConnector(ACTIVEMQ_BROKER_BIND);
        brokerService.start();
        destination = new ActiveMQTopic(getName());
        exceptions = new Vector<Throwable>();
        
        receivedLatch = 
            new CountDownLatch(numConsumers * (numMessages + dlqMessages));
        started = new CountDownLatch(1);
    }
    
    @Override
    protected void tearDown() throws Exception {
        for (Thread t : threads) {
            t.interrupt();
            t.join();
        }        
        brokerService.stop();
    }

    public void testConcurrentTopicResendToDLQ() throws Exception {

        for (int i=0; i<numConsumers;i++) {
            ConsumerThread c1 = new ConsumerThread("Consumer-" + i);
            threads.add(c1);
            c1.start();
        }
        
        assertTrue(started.await(10, TimeUnit.SECONDS));
        
        Thread producer = new Thread() {
            @Override
            public void run() {
                try {
                    produce(numMessages);
                } catch (Exception e) {
                }
            }
        };
        threads.add(producer);
        producer.start();
        
        boolean allGood = receivedLatch.await(30, TimeUnit.SECONDS);
        for (Throwable t: exceptions) {
            log.error("failing test with first exception", t);
            fail("exception during test : " + t);
        }        
        assertTrue("excepted messages received within time limit", allGood);
        
        assertEquals(0, exceptions.size());
    
        for (int i=0; i<numConsumers; i++) {
            // last recovery sends message to deq so is not received again
            assertEquals(dlqMessages*2, ((ConsumerThread)threads.get(i)).recoveries);
            assertEquals(numMessages + dlqMessages, ((ConsumerThread)threads.get(i)).counter);
        }
       
        // half of the messages for each consumer should go to the dlq but duplicates will
        // be suppressed
        consumeFromDLQ(dlqMessages);
        
    }    
    
    private void consumeFromDLQ( int messageCount) throws Exception {
        ActiveMQConnectionFactory connectionFactory = 
            new ActiveMQConnectionFactory(ACTIVEMQ_BROKER_URL);
        Connection connection = connectionFactory.createConnection();
        connection.start();
                    
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer dlqConsumer = session.createConsumer(new ActiveMQQueue("ActiveMQ.DLQ"));
        int count = 0;
        for (int i=0; i< messageCount; i++) {
            if (dlqConsumer.receive(1000) == null) {
                break;
            }
            count++;
        }
        assertEquals(messageCount, count);
    }

    public void produce(int count) throws Exception {
        Connection connection=null;
        try {
            ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(ACTIVEMQ_BROKER_BIND);
            connection = factory.createConnection();
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageProducer producer = session.createProducer(destination);
            producer.setTimeToLive(0);
            connection.start();
            
            for (int i=0 ; i< count; i++) {
                int id = i+1;
                TextMessage message = session.createTextMessage(getName()+" Message "+ id);
                message.setIntProperty("MsgNumber", id);
                producer.send(message);
                
                if (id % 500 == 0) {
                    log.info("sent " + id + ", ith " + message);
                }
            }
        } catch (JMSException e) {
            log.error("unexpected ex on produce", e);
            exceptions.add(e);
        } finally {
            try {
                if (connection != null) {
                    connection.close();
                }
            } catch (Throwable e) {
            }
        }
    }
    
    public class ConsumerThread extends Thread implements MessageListener   {
        public long counter = 0;
        public long recoveries = 0;
        private Session session;

        public ConsumerThread(String threadId) {
            super(threadId);
        }

        public void run() {
            try {
                ActiveMQConnectionFactory connectionFactory = 
                    new ActiveMQConnectionFactory(ACTIVEMQ_BROKER_URL);
                Connection connection = connectionFactory.createConnection();
                connection.setExceptionListener(testCase);
                connection.setClientID(getName());            
                session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
                MessageConsumer consumer = session.createDurableSubscriber(destination, getName());                            
                consumer.setMessageListener(this);
                connection.start();
                
                started .countDown();
            
            } catch (JMSException exception) {
                log.error("unexpected ex in consumer run", exception);
                exceptions.add(exception);
            }
        }
        
        public void onMessage(Message message) {
            try {
                counter++;
                int messageNumber=message.getIntProperty("MsgNumber");
                if(messageNumber%2==0){
                    session.recover();
                    recoveries++;
                } else {
                    message.acknowledge();
                }     
                
                if (counter % 200 == 0) {
                    log.info("recoveries:" + recoveries + ", Received " + counter + ", counter'th " + message);
                }
                receivedLatch.countDown();
            }catch (Exception e) {
                log.error("unexpected ex on onMessage", e);
                exceptions.add(e);
            }
        }
        
    }

    public void onException(JMSException exception) {
        log.info("Unexpected JMSException", exception);
        exceptions.add(exception);
    }

    public void uncaughtException(Thread thread, Throwable exception) {
        log.info("Unexpected exception from thread " + thread + ", ex: " + exception);
        exceptions.add(exception);
    }

}