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* 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.bugs;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import javax.jms.Connection;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import junit.framework.TestCase;
import org.apache.activemq.ActiveMQConnectionFactory;
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.command.ActiveMQQueue;
import org.apache.activemq.leveldb.LevelDBStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This is a test case for the issue reported at:
* https://issues.apache.org/activemq/browse/AMQ-1866
*
* If you have a JMS producer sending messages to multiple fast consumers and
* one slow consumer, eventually all consumers will run as slow as
* the slowest consumer.
*/
public class AMQ1866 extends TestCase {
private static final Logger log = LoggerFactory.getLogger(ConsumerThread.class);
private BrokerService brokerService;
private ArrayList<Thread> threads = new ArrayList<Thread>();
private final String ACTIVEMQ_BROKER_BIND = "tcp://localhost:0";
private String ACTIVEMQ_BROKER_URI;
AtomicBoolean shutdown = new AtomicBoolean();
private ActiveMQQueue destination;
@Override
protected void setUp() throws Exception {
// Start an embedded broker up.
brokerService = new BrokerService();
LevelDBStore adaptor = new LevelDBStore();
brokerService.setPersistenceAdapter(adaptor);
brokerService.deleteAllMessages();
// A small max page size makes this issue occur faster.
PolicyMap policyMap = new PolicyMap();
PolicyEntry pe = new PolicyEntry();
pe.setMaxPageSize(1);
policyMap.put(new ActiveMQQueue(">"), pe);
brokerService.setDestinationPolicy(policyMap);
brokerService.addConnector(ACTIVEMQ_BROKER_BIND);
brokerService.start();
ACTIVEMQ_BROKER_URI = brokerService.getTransportConnectors().get(0).getPublishableConnectString();
destination = new ActiveMQQueue(getName());
}
@Override
protected void tearDown() throws Exception {
// Stop any running threads.
shutdown.set(true);
for (Thread t : threads) {
t.interrupt();
t.join();
}
brokerService.stop();
}
public void testConsumerSlowDownPrefetch0() throws Exception {
ACTIVEMQ_BROKER_URI = ACTIVEMQ_BROKER_URI + "?jms.prefetchPolicy.queuePrefetch=0";
doTestConsumerSlowDown();
}
public void testConsumerSlowDownPrefetch10() throws Exception {
ACTIVEMQ_BROKER_URI = ACTIVEMQ_BROKER_URI + "?jms.prefetchPolicy.queuePrefetch=10";
doTestConsumerSlowDown();
}
public void testConsumerSlowDownDefaultPrefetch() throws Exception {
doTestConsumerSlowDown();
}
public void doTestConsumerSlowDown() throws Exception {
// Preload the queue.
produce(20000);
Thread producer = new Thread() {
@Override
public void run() {
try {
while(!shutdown.get()) {
produce(1000);
}
} catch (Exception e) {
}
}
};
threads.add(producer);
producer.start();
// This is the slow consumer.
ConsumerThread c1 = new ConsumerThread("Consumer-1");
threads.add(c1);
c1.start();
// Wait a bit so that the slow consumer gets assigned most of the messages.
Thread.sleep(500);
ConsumerThread c2 = new ConsumerThread("Consumer-2");
threads.add(c2);
c2.start();
int totalReceived = 0;
for ( int i=0; i < 30; i++) {
Thread.sleep(1000);
long c1Counter = c1.counter.getAndSet(0);
long c2Counter = c2.counter.getAndSet(0);
log.debug("c1: "+c1Counter+", c2: "+c2Counter);
totalReceived += c1Counter;
totalReceived += c2Counter;
// Once message have been flowing for a few seconds, start asserting that c2 always gets messages. It should be receiving about 100 / sec
if( i > 10 ) {
assertTrue("Total received=" + totalReceived + ", Consumer 2 should be receiving new messages every second.", c2Counter > 0);
}
}
}
public void produce(int count) throws Exception {
Connection connection=null;
try {
ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(ACTIVEMQ_BROKER_URI);
factory.setDispatchAsync(true);
connection = factory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(destination);
connection.start();
for( int i=0 ; i< count; i++ ) {
producer.send(session.createTextMessage(getName()+" Message "+(++i)));
}
} finally {
try {
connection.close();
} catch (Throwable e) {
}
}
}
public class ConsumerThread extends Thread {
final AtomicLong counter = new AtomicLong();
public ConsumerThread(String threadId) {
super(threadId);
}
public void run() {
Connection connection=null;
try {
log.debug(getName() + ": is running");
ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(ACTIVEMQ_BROKER_URI);
factory.setDispatchAsync(true);
connection = factory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageConsumer consumer = session.createConsumer(destination);
connection.start();
while (!shutdown.get()) {
TextMessage msg = (TextMessage)consumer.receive(1000);
if ( msg!=null ) {
int sleepingTime;
if (getName().equals("Consumer-1")) {
sleepingTime = 1000 * 1000;
} else {
sleepingTime = 1;
}
counter.incrementAndGet();
Thread.sleep(sleepingTime);
}
}
} catch (Exception e) {
} finally {
log.debug(getName() + ": is stopping");
try {
connection.close();
} catch (Throwable e) {
}
}
}
}
}