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ActiveMQ example source code file (ConsumeTopicPrefetchTest.java)

This example ActiveMQ source code file (ConsumeTopicPrefetchTest.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, consumetopicprefetchtest, destinationstatistics, exception, exception, jmsexception, jmsexception, message, message, regionbroker, should, string, textmessage, textmessage

The ActiveMQ ConsumeTopicPrefetchTest.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.JMSException;
import javax.jms.Message;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.broker.BrokerRegistry;
import org.apache.activemq.broker.policy.IndividualDeadLetterViaXmlTest;
import org.apache.activemq.broker.region.DestinationStatistics;
import org.apache.activemq.broker.region.RegionBroker;
import org.apache.activemq.util.Wait;
import org.apache.activemq.util.Wait.Condition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class ConsumeTopicPrefetchTest extends ProducerConsumerTestSupport {
    private static final Logger LOG = LoggerFactory.getLogger(ConsumeTopicPrefetchTest.class);

    protected int prefetchSize = 100;
    protected String[] messageTexts;
    protected long consumerTimeout = 10000L;

    public void testSendPrefetchSize() throws JMSException {
        testWithMessageCount(prefetchSize);
    }

    public void testSendDoublePrefetchSize() throws JMSException {
        testWithMessageCount(prefetchSize * 2);
    }

    public void testSendPrefetchSizePlusOne() throws JMSException {
        testWithMessageCount(prefetchSize + 1);
    }

    protected void testWithMessageCount(int messageCount) throws JMSException {
        makeMessages(messageCount);

        LOG.info("About to send and receive: " + messageCount + " on destination: " + destination
                + " of type: " + destination.getClass().getName());

        for (int i = 0; i < messageCount; i++) {
            Message message = session.createTextMessage(messageTexts[i]);
            producer.send(message);
        }

        validateConsumerPrefetch(this.getSubject(), prefetchSize);
        
        // lets consume them in two fetch batches
        for (int i = 0; i < messageCount; i++) {
            consumeMessge(i);
        }
    }

    protected Connection createConnection() throws Exception {
        ActiveMQConnection connection = (ActiveMQConnection) super.createConnection();
        connection.getPrefetchPolicy().setQueuePrefetch(prefetchSize);
        connection.getPrefetchPolicy().setTopicPrefetch(prefetchSize);
        return connection;
    }

    protected TextMessage consumeMessge(int i) throws JMSException {
        Message message = consumer.receive(consumerTimeout);
        assertTrue("Should have received a message by now for message: " + i, message != null);
        assertTrue("Should be a TextMessage: " + message, message instanceof TextMessage);
        TextMessage textMessage = (TextMessage) message;
        assertEquals("Message content", messageTexts[i], textMessage.getText());
        return textMessage;
    }


    protected void makeMessages(int messageCount) {
        messageTexts = new String[messageCount];
        for (int i = 0; i < messageCount; i++) {
            messageTexts[i] = "Message for test: + " + getName() + " = " + i;
        }
    }

    protected void validateConsumerPrefetch(String destination, final long expectedCount) throws JMSException {
        RegionBroker regionBroker = (RegionBroker) BrokerRegistry.getInstance().lookup("localhost").getRegionBroker();
        for (org.apache.activemq.broker.region.Destination dest : regionBroker.getQueueRegion().getDestinationMap().values()) {
            final org.apache.activemq.broker.region.Destination target = dest;
            if (dest.getName().equals(destination)) {
                try {
                    Wait.waitFor(new Condition() {
                        public boolean isSatisified() throws Exception {
                            DestinationStatistics stats = target.getDestinationStatistics();
                            LOG.info("inflight for : " + target.getName() + ": " +  stats.getInflight().getCount());
                            return stats.getInflight().getCount() == expectedCount;
                        }
                    });
                } catch (Exception e) {
                    throw new JMSException(e.toString());
                }
                DestinationStatistics stats = dest.getDestinationStatistics();
                LOG.info("inflight for : " + dest.getName() + ": " + stats.getInflight().getCount());
                assertEquals("inflight for: " + dest.getName() + ": " + stats.getInflight().getCount() + " matches", 
                        expectedCount, stats.getInflight().getCount());      
            }
        }
    }
}

Other ActiveMQ examples (source code examples)

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

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