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ActiveMQ example source code file (DurableConsumerCloseAndReconnectTest.java)

This example ActiveMQ source code file (DurableConsumerCloseAndReconnectTest.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, destination, exception, exception, jmsexception, jmsexception, messageconsumer, now, override, should, should, string

The ActiveMQ DurableConsumerCloseAndReconnectTest.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.usecases;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
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;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.test.TestSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class DurableConsumerCloseAndReconnectTest extends TestSupport {
    protected static final long RECEIVE_TIMEOUT = 5000L;
    private static final Logger LOG = LoggerFactory.getLogger(DurableConsumerCloseAndReconnectTest.class);

    protected Connection connection;
    private Session session;
    private MessageConsumer consumer;
    private MessageProducer producer;
    private Destination destination;
    private int messageCount;

    
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        deleteAllMessages();
    }

    @Override
    protected void tearDown() throws Exception {
        super.tearDown();
        deleteAllMessages();
    }

    private void deleteAllMessages() throws Exception {
        ActiveMQConnectionFactory fac = new ActiveMQConnectionFactory("vm://localhost?broker.deleteAllMessagesOnStartup=true");
        Connection dummyConnection = fac.createConnection();
        dummyConnection.start();
        dummyConnection.close();
    }
    
    protected ActiveMQConnectionFactory createConnectionFactory() throws Exception {
        return new ActiveMQConnectionFactory("vm://localhost?broker.deleteAllMessagesOnStartup=false");
    }

    public void testCreateDurableConsumerCloseThenReconnect() throws Exception {
        // force the server to stay up across both connection tests
        Connection dummyConnection = createConnection();
        dummyConnection.start();

        consumeMessagesDeliveredWhileConsumerClosed();

        dummyConnection.close();

        // now lets try again without one connection open
        consumeMessagesDeliveredWhileConsumerClosed();       
    }

    protected void consumeMessagesDeliveredWhileConsumerClosed() throws Exception {
        makeConsumer();
        closeConsumer();

        publish();

        // wait a few moments for the close to really occur
        Thread.sleep(1000);

        makeConsumer();

        Message message = consumer.receive(RECEIVE_TIMEOUT);
        assertTrue("Should have received a message!", message != null);

        closeConsumer();

        LOG.info("Now lets create the consumer again and because we didn't ack, we should get it again");
        makeConsumer();

        message = consumer.receive(RECEIVE_TIMEOUT);
        assertTrue("Should have received a message!", message != null);
        message.acknowledge();

        closeConsumer();

        LOG.info("Now lets create the consumer again and because we did ack, we should not get it again");
        makeConsumer();

        message = consumer.receive(2000);
        assertTrue("Should have no more messages left!", message == null);

        closeConsumer();

        LOG.info("Lets publish one more message now");
        publish();

        makeConsumer();
        message = consumer.receive(RECEIVE_TIMEOUT);
        assertTrue("Should have received a message!", message != null);
        message.acknowledge();

        closeConsumer();
    }

    protected void publish() throws Exception {
        connection = createConnection();
        connection.start();

        session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        destination = createDestination();

        producer = session.createProducer(destination);
        producer.setDeliveryMode(DeliveryMode.PERSISTENT);
        TextMessage msg = session.createTextMessage("This is a test: " + messageCount++);
        producer.send(msg);

        producer.close();
        producer = null;
        closeSession();
    }

    protected Destination createDestination() throws JMSException {
        if (isTopic()) {
            return session.createTopic(getSubject());
        } else {
            return session.createQueue(getSubject());
        }
    }

    protected boolean isTopic() {
        return true;
    }

    protected void closeConsumer() throws JMSException {
        consumer.close();
        consumer = null;
        closeSession();
    }

    protected void closeSession() throws JMSException {
        session.close();
        session = null;
        connection.close();
        connection = null;
    }

    protected void makeConsumer() throws Exception {
        String durableName = getName();
        String clientID = getSubject();
        LOG.info("Creating a durable subscribe for clientID: " + clientID + " and durable name: " + durableName);
        createSession(clientID);
        consumer = createConsumer(durableName);
    }

    private MessageConsumer createConsumer(String durableName) throws JMSException {
        if (destination instanceof Topic) {
            return session.createDurableSubscriber((Topic)destination, durableName);
        } else {
            return session.createConsumer(destination);
        }
    }

    protected void createSession(String clientID) throws Exception {
        connection = createConnection();
        connection.setClientID(clientID);
        connection.start();

        session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        destination = createDestination();
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ DurableConsumerCloseAndReconnectTest.java source code file:

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