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ActiveMQ example source code file (ZeroPrefetchConsumerTest.java)

This example ActiveMQ source code file (ZeroPrefetchConsumerTest.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

exception, exception, messageconsumer, messageconsumer, messageproducer, msg1, msg2, msg2, msg5, msg8, session, should, should, textmessage

The ActiveMQ ZeroPrefetchConsumerTest.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;

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.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.spring.SpringConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class ZeroPrefetchConsumerTest extends EmbeddedBrokerTestSupport {

    private static final Logger LOG = LoggerFactory.getLogger(ZeroPrefetchConsumerTest.class);

    protected Connection connection;
    protected Queue queue;

    public void testCannotUseMessageListener() throws Exception {
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer consumer = session.createConsumer(queue);

        MessageListener listener = new SpringConsumer();
        try {
            consumer.setMessageListener(listener);
            fail("Should have thrown JMSException as we cannot use MessageListener with zero prefetch");
        } catch (JMSException e) {
            LOG.info("Received expected exception : " + e);
        }
    }

    public void testPullConsumerWorks() throws Exception {
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        MessageProducer producer = session.createProducer(queue);
        producer.send(session.createTextMessage("Hello World!"));

        // now lets receive it
        MessageConsumer consumer = session.createConsumer(queue);
        Message answer = consumer.receive(5000);
        assertNotNull("Should have received a message!", answer);
        // check if method will return at all and will return a null
        answer = consumer.receive(1);
        assertNull("Should have not received a message!", answer);
        answer = consumer.receiveNoWait();
        assertNull("Should have not received a message!", answer);
    }

    public void testIdleConsumer() throws Exception {
        doTestIdleConsumer(false);
    }

    public void testIdleConsumerTranscated() throws Exception {
        doTestIdleConsumer(true);
    }

    private void doTestIdleConsumer(boolean transacted) throws Exception {
        Session session = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);

        MessageProducer producer = session.createProducer(queue);
        producer.send(session.createTextMessage("Msg1"));
        producer.send(session.createTextMessage("Msg2"));
        if (transacted) {
            session.commit();
        }
        // now lets receive it
        MessageConsumer consumer = session.createConsumer(queue);
        
        session.createConsumer(queue);
        TextMessage answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg1");
        if (transacted) {
            session.commit();
        }
        // this call would return null if prefetchSize > 0
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg2");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receiveNoWait();
        assertNull("Should have not received a message!", answer);
    }

    public void testRecvRecvCommit() throws Exception {
        doTestRecvRecvCommit(false);
    }

    public void testRecvRecvCommitTranscated() throws Exception {
        doTestRecvRecvCommit(true);
    }

    private void doTestRecvRecvCommit(boolean transacted) throws Exception {
        Session session = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);

        MessageProducer producer = session.createProducer(queue);
        producer.send(session.createTextMessage("Msg1"));
        producer.send(session.createTextMessage("Msg2"));
        if (transacted) {
            session.commit();
        }
        // now lets receive it
        MessageConsumer consumer = session.createConsumer(queue);
        TextMessage answer = (TextMessage)consumer.receiveNoWait();
        assertEquals("Should have received a message!", answer.getText(), "Msg1");
        answer = (TextMessage)consumer.receiveNoWait();
        assertEquals("Should have received a message!", answer.getText(), "Msg2");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receiveNoWait();
        assertNull("Should have not received a message!", answer);
    }
    
    public void testTwoConsumers() throws Exception {
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        MessageProducer producer = session.createProducer(queue);
        producer.send(session.createTextMessage("Msg1"));
        producer.send(session.createTextMessage("Msg2"));

        // now lets receive it
        MessageConsumer consumer1 = session.createConsumer(queue);
        MessageConsumer consumer2 = session.createConsumer(queue);
        TextMessage answer = (TextMessage)consumer1.receiveNoWait();
        assertEquals("Should have received a message!", answer.getText(), "Msg1");
        answer = (TextMessage)consumer2.receiveNoWait();
        assertEquals("Should have received a message!", answer.getText(), "Msg2");

        answer = (TextMessage)consumer2.receiveNoWait();
        assertNull("Should have not received a message!", answer);
    }
    
    // https://issues.apache.org/activemq/browse/AMQ-2567
    public void testManyMessageConsumer() throws Exception {
        doTestManyMessageConsumer(true);
    }

    public void testManyMessageConsumerNoTransaction() throws Exception {
        doTestManyMessageConsumer(false);
    }
    
    private void doTestManyMessageConsumer(boolean transacted) throws Exception {
        Session session = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);

        MessageProducer producer = session.createProducer(queue);
        producer.send(session.createTextMessage("Msg1"));
        producer.send(session.createTextMessage("Msg2"));
        producer.send(session.createTextMessage("Msg3"));
        producer.send(session.createTextMessage("Msg4"));
        producer.send(session.createTextMessage("Msg5"));
        producer.send(session.createTextMessage("Msg6"));
        producer.send(session.createTextMessage("Msg7"));
        producer.send(session.createTextMessage("Msg8"));
        if (transacted) {
            session.commit();
        }
        // now lets receive it
        MessageConsumer consumer = session.createConsumer(queue);
        
        MessageConsumer consumer2  = session.createConsumer(queue);
        TextMessage answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg1");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg2");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg3");
        if (transacted) {
            session.commit();
        }
        // this call would return null if prefetchSize > 0
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg4");
        if (transacted) {
            session.commit();
        }
        // Now using other consumer 
        // this call should return the next message (Msg5) still left on the queue
        answer = (TextMessage)consumer2.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg5");
        if (transacted) {
            session.commit();
        }
        // Now using other consumer 
        // this call should return the next message (Msg5) still left on the queue
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg6");
        // read one more message without commit
        // Now using other consumer 
        // this call should return the next message (Msg5) still left on the queue
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg7");
        if (transacted) {
            session.commit();
        }
        // Now using other consumer 
        // this call should return the next message (Msg5) still left on the queue
        answer = (TextMessage)consumer2.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg8");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receiveNoWait();
        assertNull("Should have not received a message!", answer);
    }

    public void testManyMessageConsumerWithSend() throws Exception {
        doTestManyMessageConsumerWithSend(true);
    }

    public void testManyMessageConsumerWithSendNoTransaction() throws Exception {
        doTestManyMessageConsumerWithSend(false);
    }
    
    private void doTestManyMessageConsumerWithSend(boolean transacted) throws Exception {
        Session session = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);

        MessageProducer producer = session.createProducer(queue);
        producer.send(session.createTextMessage("Msg1"));
        producer.send(session.createTextMessage("Msg2"));
        producer.send(session.createTextMessage("Msg3"));
        producer.send(session.createTextMessage("Msg4"));
        producer.send(session.createTextMessage("Msg5"));
        producer.send(session.createTextMessage("Msg6"));
        producer.send(session.createTextMessage("Msg7"));
        producer.send(session.createTextMessage("Msg8"));
        if (transacted) {
            session.commit();
        }
        // now lets receive it
        MessageConsumer consumer = session.createConsumer(queue);
        
        MessageConsumer consumer2  = session.createConsumer(queue);
        TextMessage answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg1");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg2");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg3");
        if (transacted) {
            session.commit();
        }
        // Now using other consumer take 2
        answer = (TextMessage)consumer2.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg4");
        answer = (TextMessage)consumer2.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg5");

        // ensure prefetch extension ok by sending another that could get dispatched
        producer.send(session.createTextMessage("Msg9"));
        if (transacted) {
            session.commit();
        }
        
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg6");
        // read one more message without commit
        // and using other consumer 
        answer = (TextMessage)consumer2.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg7");
        if (transacted) {
            session.commit();
        }
        
        answer = (TextMessage)consumer2.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg8");
        if (transacted) {
            session.commit();
        }
        
        answer = (TextMessage)consumer.receive(5000);
        assertEquals("Should have received a message!", answer.getText(), "Msg9");
        if (transacted) {
            session.commit();
        }
        answer = (TextMessage)consumer.receiveNoWait();
        assertNull("Should have not received a message!", answer);
    }
    
    protected void setUp() throws Exception {
        bindAddress = "tcp://localhost:0";
        super.setUp();

        connection = createConnection();
        connection.start();
        queue = createQueue();
    }
    
    protected void startBroker() throws Exception {
        super.startBroker();
        bindAddress = broker.getTransportConnectors().get(0).getConnectUri().toString();
    }

    protected void tearDown() throws Exception {
        connection.close();
        super.tearDown();
    }

    protected Queue createQueue() {
        return new ActiveMQQueue(getDestinationString() + "?consumer.prefetchSize=0");
    }

}

Other ActiveMQ examples (source code examples)

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