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ActiveMQ example source code file (JmsConnectionStartStopTest.java)

This example ActiveMQ source code file (JmsConnectionStartStopTest.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

connection, connection, exception, exception, hello, messageconsumer, random, random, runnable, runnable, session, textmessage, threading, threadpoolexecutor, threads, util, vector

The ActiveMQ JmsConnectionStartStopTest.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;

import java.util.Random;
import java.util.Vector;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

/**
 * 
 */
public class JmsConnectionStartStopTest extends TestSupport {

    private static final org.apache.commons.logging.Log LOG = org.apache.commons.logging.LogFactory
        .getLog(JmsConnectionStartStopTest.class);

    private Connection startedConnection;
    private Connection stoppedConnection;

    /**
     * @see junit.framework.TestCase#setUp()
     */
    protected void setUp() throws Exception {

        LOG.info(getClass().getClassLoader().getResource("log4j.properties"));

        ActiveMQConnectionFactory factory = createConnectionFactory();
        startedConnection = factory.createConnection();
        startedConnection.start();
        stoppedConnection = factory.createConnection();
    }

    /**
     * @see junit.framework.TestCase#tearDown()
     */
    protected void tearDown() throws Exception {
        stoppedConnection.close();
        startedConnection.close();
    }

    /**
     * Tests if the consumer receives the messages that were sent before the
     * connection was started.
     * 
     * @throws JMSException
     */
    public void testStoppedConsumerHoldsMessagesTillStarted() throws JMSException {
        Session startedSession = startedConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Session stoppedSession = stoppedConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        // Setup the consumers.
        Topic topic = startedSession.createTopic("test");
        MessageConsumer startedConsumer = startedSession.createConsumer(topic);
        MessageConsumer stoppedConsumer = stoppedSession.createConsumer(topic);

        // Send the message.
        MessageProducer producer = startedSession.createProducer(topic);
        TextMessage message = startedSession.createTextMessage("Hello");
        producer.send(message);

        // Test the assertions.
        Message m = startedConsumer.receive(1000);
        assertNotNull(m);

        m = stoppedConsumer.receive(1000);
        assertNull(m);

        stoppedConnection.start();
        m = stoppedConsumer.receive(5000);
        assertNotNull(m);

        startedSession.close();
        stoppedSession.close();
    }

    /**
     * Tests if the consumer is able to receive messages eveb when the
     * connecction restarts multiple times.
     * 
     * @throws Exception
     */
    public void testMultipleConnectionStops() throws Exception {
        testStoppedConsumerHoldsMessagesTillStarted();
        stoppedConnection.stop();
        testStoppedConsumerHoldsMessagesTillStarted();
        stoppedConnection.stop();
        testStoppedConsumerHoldsMessagesTillStarted();
    }


    public void testConcurrentSessionCreateWithStart() throws Exception {
        ThreadPoolExecutor executor = new ThreadPoolExecutor(50, Integer.MAX_VALUE,
                                      60L, TimeUnit.SECONDS,
                                      new SynchronousQueue<Runnable>());
        final Vector<Throwable> exceptions = new Vector();
        final Random rand = new Random();
        Runnable createSessionTask = new Runnable() {
            public void run() {
                try {
                    TimeUnit.MILLISECONDS.sleep(rand.nextInt(10));
                    stoppedConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);
                } catch (Exception e) {
                    exceptions.add(e);
                }
            }
        };

        Runnable startStopTask = new Runnable() {
            public void run() {
                try {
                    TimeUnit.MILLISECONDS.sleep(rand.nextInt(10));
                    stoppedConnection.start();
                    stoppedConnection.stop();
                } catch (Exception e) {
                    exceptions.add(e);
                }
            }
        };

        for (int i=0; i<1000; i++) {
            executor.execute(createSessionTask);
            executor.execute(startStopTask);
        }

        executor.shutdown();
        assertTrue("executor terminated", executor.awaitTermination(30, TimeUnit.SECONDS));
        assertTrue("no exceptions: " + exceptions, exceptions.isEmpty());
    }
}

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