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ActiveMQ example source code file (JmsSchedulerTest.java)

This example ActiveMQ source code file (JmsSchedulerTest.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

brokerservice, connection, count, count, countdownlatch, countdownlatch, exception, exception, io, messageconsumer, messagelistener, messageproducer, session, textmessage, textmessage, threading, threads, util

The ActiveMQ JmsSchedulerTest.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.broker.scheduler;

import java.io.File;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import javax.jms.Connection;
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 org.apache.activemq.EmbeddedBrokerTestSupport;
import org.apache.activemq.ScheduledMessage;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.util.IOHelper;

public class JmsSchedulerTest extends EmbeddedBrokerTestSupport {

    public void testCron() throws Exception {
        final int COUNT = 10;
        final AtomicInteger count = new AtomicInteger();
        Connection connection = createConnection();

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        MessageConsumer consumer = session.createConsumer(destination);

        final CountDownLatch latch = new CountDownLatch(COUNT);
        consumer.setMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                latch.countDown();
                count.incrementAndGet();
            }
        });

        connection.start();
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage("test msg");
        long time = 1000;
        message.setStringProperty(ScheduledMessage.AMQ_SCHEDULED_CRON, "* * * * *");
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD, 500);
        message.setIntProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT, COUNT - 1);

        producer.send(message);
        producer.close();

        Thread.sleep(500);
        SchedulerBroker sb = (SchedulerBroker) this.broker.getBroker().getAdaptor(SchedulerBroker.class);
        JobScheduler js = sb.getJobScheduler();
        List<Job> list = js.getAllJobs();
        assertEquals(1, list.size());
        latch.await(240, TimeUnit.SECONDS);
        assertEquals(COUNT, count.get());
    }

    public void testSchedule() throws Exception {
        final int COUNT = 1;
        Connection connection = createConnection();

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        MessageConsumer consumer = session.createConsumer(destination);

        final CountDownLatch latch = new CountDownLatch(COUNT);
        consumer.setMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                latch.countDown();
            }
        });

        connection.start();
        long time = 5000;
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage("test msg");

        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);

        producer.send(message);
        producer.close();
        // make sure the message isn't delivered early
        Thread.sleep(2000);
        assertEquals(latch.getCount(), COUNT);
        latch.await(5, TimeUnit.SECONDS);
        assertEquals(latch.getCount(), 0);
    }

    public void testTransactedSchedule() throws Exception {
        final int COUNT = 1;
        Connection connection = createConnection();

        final Session session = connection.createSession(true, Session.SESSION_TRANSACTED);

        MessageConsumer consumer = session.createConsumer(destination);

        final CountDownLatch latch = new CountDownLatch(COUNT);
        consumer.setMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                try {
                    session.commit();
                } catch (JMSException e) {
                    e.printStackTrace();
                }
                latch.countDown();
            }
        });

        connection.start();
        long time = 5000;
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage("test msg");

        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);

        producer.send(message);
        session.commit();
        producer.close();
        // make sure the message isn't delivered early
        Thread.sleep(2000);
        assertEquals(latch.getCount(), COUNT);
        latch.await(5, TimeUnit.SECONDS);
        assertEquals(latch.getCount(), 0);
    }


    public void testScheduleRepeated() throws Exception {
        final int NUMBER = 10;
        final AtomicInteger count = new AtomicInteger();
        Connection connection = createConnection();

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        MessageConsumer consumer = session.createConsumer(destination);

        final CountDownLatch latch = new CountDownLatch(NUMBER);
        consumer.setMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                latch.countDown();
                count.incrementAndGet();
            }
        });

        connection.start();
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage("test msg");
        long time = 1000;
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD, 500);
        message.setIntProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT, NUMBER - 1);
        producer.send(message);
        producer.close();
        assertEquals(latch.getCount(), NUMBER);
        latch.await(10, TimeUnit.SECONDS);
        assertEquals(0, latch.getCount());
        // wait a little longer - make sure we only get NUMBER of replays
        Thread.sleep(1000);
        assertEquals(NUMBER, count.get());
    }

    public void testScheduleRestart() throws Exception {
        // send a message
        Connection connection = createConnection();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        connection.start();
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage("test msg");
        long time = 5000;
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);
        producer.send(message);
        producer.close();

        //restart broker
        broker.stop();
        broker.waitUntilStopped();

        broker = createBroker(false);
        broker.start();
        broker.waitUntilStarted();


        // consume the message
        connection = createConnection();
        connection.start();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer consumer = session.createConsumer(destination);
        Message msg = consumer.receive(5000);
        assertNotNull("Didn't receive the message", msg);

        //send another message
        producer = session.createProducer(destination);
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);
        producer.send(message);
        producer.close();
    }

    @Override
    protected void setUp() throws Exception {
        bindAddress = "vm://localhost";
        super.setUp();
    }

    @Override
    protected BrokerService createBroker() throws Exception {
        return createBroker(true);
    }

    protected BrokerService createBroker(boolean delete) throws Exception {
        File schedulerDirectory = new File("target/scheduler");
        if (delete) {
            IOHelper.mkdirs(schedulerDirectory);
            IOHelper.deleteChildren(schedulerDirectory);
        }
        BrokerService answer = new BrokerService();
        answer.setPersistent(isPersistent());
        answer.setDeleteAllMessagesOnStartup(true);
        answer.setDataDirectory("target");
        answer.setSchedulerDirectoryFile(schedulerDirectory);
        answer.setSchedulerSupport(true);
        answer.setUseJmx(false);
        answer.addConnector(bindAddress);
        return answer;
    }
}

Other ActiveMQ examples (source code examples)

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