alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

ActiveMQ example source code file (ProducerFlowControlSendFailTest.java)

This example ActiveMQ source code file (ProducerFlowControlSendFailTest.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, atomicboolean, atomicboolean, brokerservice, exception, exception, messageconsumer, messageproducer, override, override, resourceallocationexception, textmessage, thread

The ActiveMQ ProducerFlowControlSendFailTest.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 java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

import javax.jms.ConnectionFactory;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.ResourceAllocationException;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.broker.region.policy.VMPendingQueueMessageStoragePolicy;
import org.apache.activemq.broker.region.policy.VMPendingSubscriberMessageStoragePolicy;

public class ProducerFlowControlSendFailTest extends ProducerFlowControlTest {

    protected BrokerService createBroker() throws Exception {
        BrokerService service = new BrokerService();
        service.setPersistent(false);
        service.setUseJmx(false);

        // Setup a destination policy where it takes only 1 message at a time.
        PolicyMap policyMap = new PolicyMap();
        PolicyEntry policy = new PolicyEntry();
        policy.setMemoryLimit(1);
        policy.setPendingSubscriberPolicy(new VMPendingSubscriberMessageStoragePolicy());
        policy.setPendingQueuePolicy(new VMPendingQueueMessageStoragePolicy());
        policy.setProducerFlowControl(true);
        policyMap.setDefaultEntry(policy);
        service.setDestinationPolicy(policyMap);
        
        service.getSystemUsage().setSendFailIfNoSpace(true);

        connector = service.addConnector("tcp://localhost:0");
        return service;
    }
    
    @Override
    public void test2ndPubisherWithStandardConnectionThatIsBlocked() throws Exception {
        // with sendFailIfNoSpace set, there is no blocking of the connection
    }
    
    @Override
    public void testAsyncPubisherRecoverAfterBlock() throws Exception {
        // sendFail means no flowControllwindow as there is no producer ack, just an exception
    }
    
    @Override
    public void testPubisherRecoverAfterBlock() throws Exception {
        ActiveMQConnectionFactory factory = (ActiveMQConnectionFactory)createConnectionFactory();
        // with sendFail, there must be no flowControllwindow
        // sendFail is an alternative flow control mechanism that does not block
        factory.setUseAsyncSend(true);
        connection = (ActiveMQConnection)factory.createConnection();
        connections.add(connection);
        connection.start();

        final Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        final MessageProducer producer = session.createProducer(queueA);
        
        final AtomicBoolean keepGoing = new AtomicBoolean(true);
   
        Thread thread = new Thread("Filler") {
            @Override
            public void run() {
                while (keepGoing.get()) {
                    try {
                        producer.send(session.createTextMessage("Test message"));
                        if (gotResourceException.get()) {
                            // do not flood the broker with requests when full as we are sending async and they 
                            // will be limited by the network buffers
                            Thread.sleep(200);
                        }
                    } catch (Exception e) {
                        // with async send, there will be no exceptions
                        e.printStackTrace();
                    }
                }
            }
        };
        thread.start();
        waitForBlockedOrResourceLimit(new AtomicBoolean(false));

        // resourceException on second message, resumption if we
        // can receive 10
        MessageConsumer consumer = session.createConsumer(queueA);
        TextMessage msg;
        for (int idx = 0; idx < 10; ++idx) {
            msg = (TextMessage) consumer.receive(1000);
            if (msg != null) {
                msg.acknowledge();
            }
        }
        keepGoing.set(false);
    }

    public void testPubisherRecoverAfterBlockWithSyncSend() throws Exception {
        ActiveMQConnectionFactory factory = (ActiveMQConnectionFactory)createConnectionFactory();
        factory.setExceptionListener(null);
        factory.setUseAsyncSend(false);
        connection = (ActiveMQConnection)factory.createConnection();
        connections.add(connection);
        connection.start();

        final Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
        final MessageProducer producer = session.createProducer(queueA);
        
        final AtomicBoolean keepGoing = new AtomicBoolean(true);
        final AtomicInteger exceptionCount = new AtomicInteger(0);
        Thread thread = new Thread("Filler") {
            @Override
            public void run() {
                while (keepGoing.get()) {
                    try {
                        producer.send(session.createTextMessage("Test message"));
                    } catch (JMSException arg0) {
                        if (arg0 instanceof ResourceAllocationException) {
                            gotResourceException.set(true);
                            exceptionCount.incrementAndGet();
                        }
                    }
                }
            }
        };
        thread.start();
        waitForBlockedOrResourceLimit(new AtomicBoolean(false));

        // resourceException on second message, resumption if we
        // can receive 10
        MessageConsumer consumer = session.createConsumer(queueA);
        TextMessage msg;
        for (int idx = 0; idx < 10; ++idx) {
            msg = (TextMessage) consumer.receive(1000);
            if (msg != null) {
                msg.acknowledge();
            }
        }
        assertTrue("we were blocked at least 5 times", 5 < exceptionCount.get());
        keepGoing.set(false);
    }
    
	@Override
	protected ConnectionFactory createConnectionFactory() throws Exception {
		ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(connector.getConnectUri());
		connectionFactory.setExceptionListener(new ExceptionListener() {
				public void onException(JMSException arg0) {
					if (arg0 instanceof ResourceAllocationException) {
						gotResourceException.set(true);
					}
				}
	        });
		return connectionFactory;
	}
}

Other ActiveMQ examples (source code examples)

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

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.