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ActiveMQ example source code file (FailoverConsumerTest.java)

This example ActiveMQ source code file (FailoverConsumerTest.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, activemqprefetchpolicy, activemqprefetchpolicy, activemqqueue, activemqqueue, logger, messageconsumer, msg_count, msg_count, net, network, session, test, test, uri, you

The ActiveMQ FailoverConsumerTest.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.transport.failover;

import java.net.URI;

import javax.jms.Connection;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQPrefetchPolicy;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.network.NetworkTestSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FailoverConsumerTest extends NetworkTestSupport {

    public static final int MSG_COUNT = 100;
    private static final Logger LOG = LoggerFactory.getLogger(FailoverConsumerTest.class);


    public void testPublisherFailsOver() throws Exception {
        // Uncomment this if you want to use remote broker created by
        // NetworkTestSupport.
        // But it doesn't work. See comments below.
        // URI failoverURI = new
        // URI("failover://"+remoteConnector.getServer().getConnectURI());
        URI failoverURI = new URI("failover://tcp://localhost:61616");

        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(failoverURI);
        ActiveMQPrefetchPolicy prefetchPolicy = new ActiveMQPrefetchPolicy();

        // Prefetch size must be less than messages in the queue!!
        prefetchPolicy.setQueuePrefetch(MSG_COUNT - 10);
        factory.setPrefetchPolicy(prefetchPolicy);
        Connection connection = factory.createConnection();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(new ActiveMQQueue("Test"));
        for (int idx = 0; idx < MSG_COUNT; ++idx) {
            producer.send(session.createTextMessage("Test"));
        }
        producer.close();
        session.close();
        int count = 0;

        Session consumerSession = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        MessageConsumer consumer = consumerSession.createConsumer(new ActiveMQQueue("Test"));
        connection.start();
        Message msg = consumer.receive(3000);

        // restartRemoteBroker() doesn't work (you won't get received any
        // messages
        // after restart, javadoc says, that messages should be received
        // though).
        // So we must use external broker ant restart it manually.
        LOG.info("You should restart remote broker now and press enter!");
        System.in.read();
        // Thread.sleep(20000);
        restartRemoteBroker();
        msg.acknowledge();
        ++count;

        for (int idx = 1; idx < MSG_COUNT; ++idx) {
            msg = consumer.receive(3000);
            if (msg == null) {
                LOG.error("No messages received! Received:" + count);
                break;
            }
            msg.acknowledge();
            ++count;
        }
        assertEquals(count, MSG_COUNT);
        consumer.close();
        consumerSession.close();
        connection.close();

        connection = factory.createConnection();
        consumerSession = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        consumer = consumerSession.createConsumer(new ActiveMQQueue("Test"));
        connection.start();

        count = 0;
        do {
            msg = consumer.receive(1000);
            if (msg != null) {
                msg.acknowledge();
                ++count;
            }
        } while (msg != null);

        assertEquals(count, 0);

        consumer.close();
        consumerSession.close();
        connection.close();
    }

    protected String getRemoteURI() {
        return "tcp://localhost:55555";
    }
}

Other ActiveMQ examples (source code examples)

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

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