ActiveMQ example source code file (FailoverPrefetchZeroTest.java)

This example ActiveMQ source code file (FailoverPrefetchZeroTest.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

activemqconnection, activemqconnectionfactory, brokerservice, brokerservice, countdownlatch, countdownlatch, exception, exception, queue, session, string, string, test, threading, threads, util, vector

The ActiveMQ FailoverPrefetchZeroTest.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.util.Vector;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerPlugin;
import org.apache.activemq.broker.BrokerPluginSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.MessagePull;
import org.apache.activemq.command.Response;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.junit.After;
import org.junit.Test;


import static org.junit.Assert.assertTrue;

// see: https://issues.apache.org/activemq/browse/AMQ-2877
public class FailoverPrefetchZeroTest {

    private static final Logger LOG = LoggerFactory.getLogger(FailoverPrefetchZeroTest.class);
    private static final String QUEUE_NAME = "FailoverPrefetchZero";
    private static final String TRANSPORT_URI = "tcp://localhost:0";
    private String url;
    final int prefetch = 0;
    BrokerService broker;

    @After
    public void stopBroker() throws Exception {
        if (broker != null) {
            broker.stop();
        }
    }

    public void startBroker(boolean deleteAllMessagesOnStartup) throws Exception {
        broker = createBroker(deleteAllMessagesOnStartup);
        broker.start();
    }

    public BrokerService createBroker(boolean deleteAllMessagesOnStartup) throws Exception {
        return createBroker(deleteAllMessagesOnStartup, TRANSPORT_URI);
    }

    public BrokerService createBroker(boolean deleteAllMessagesOnStartup, String bindAddress) throws Exception {
        broker = new BrokerService();
        broker.addConnector(bindAddress);
        broker.setDeleteAllMessagesOnStartup(deleteAllMessagesOnStartup);

        url = broker.getTransportConnectors().get(0).getConnectUri().toString();

        return broker;
    }

    @Test
    public void testPrefetchZeroConsumerThroughRestart() throws Exception {
        broker = createBroker(true);

        final CountDownLatch pullDone = new CountDownLatch(1);
        broker.setPlugins(new BrokerPlugin[]{
                new BrokerPluginSupport() {
                    @Override
                    public Response messagePull(ConnectionContext context, final MessagePull pull) throws Exception {
                        context.setDontSendReponse(true);
                        pullDone.countDown();
                        Executors.newSingleThreadExecutor().execute(new Runnable() {
                            public void run() {
                                LOG.info("Stopping broker on pull: " + pull);
                                try {
                                    broker.stop();
                                } catch (Exception e) {
                                    e.printStackTrace();
                                }
                            }
                        });
                        return null;
                    }
                }
        });
        broker.start();

        ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("failover:(" + url + ")");
        cf.setWatchTopicAdvisories(false);

        final ActiveMQConnection connection = (ActiveMQConnection) cf.createConnection();
        connection.start();

        final Session consumerSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        final Queue destination = consumerSession.createQueue(QUEUE_NAME + "?consumer.prefetchSize=" + prefetch);

        final MessageConsumer consumer = consumerSession.createConsumer(destination);
        produceMessage(consumerSession, destination, 1);

        final CountDownLatch receiveDone = new CountDownLatch(1);
        final Vector<Message> received = new Vector();
        Executors.newSingleThreadExecutor().execute(new Runnable() {
            public void run() {
                try {
                    LOG.info("receive one...");
                    Message msg = consumer.receive(30000);
                    if (msg != null) {
                        received.add(msg);
                    }
                    receiveDone.countDown();
                    LOG.info("done receive");
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

        // will be stopped by the plugin
        assertTrue("pull completed on broker", pullDone.await(30, TimeUnit.SECONDS));
        broker.waitUntilStopped();
        broker = createBroker(false, url);
        broker.start();

        assertTrue("receive completed through failover", receiveDone.await(30, TimeUnit.SECONDS));

        assertTrue("we got our message:", !received.isEmpty());

        connection.close();
    }

    private void produceMessage(final Session producerSession, Queue destination, long count)
            throws JMSException {
        MessageProducer producer = producerSession.createProducer(destination);
        for (int i = 0; i < count; i++) {
            TextMessage message = producerSession.createTextMessage("Test message " + i);
            producer.send(message);
        }
        producer.close();
    }
}