package org.apache.activemq;
import java.io.IOException;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.TransportConnector;
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.transport.tcp.TcpTransport;
import edu.emory.mathcs.backport.java.util.concurrent.CountDownLatch;
import edu.emory.mathcs.backport.java.util.concurrent.TimeUnit;
import edu.emory.mathcs.backport.java.util.concurrent.atomic.AtomicBoolean;
public class ProducerFlowControlTest extends JmsTestSupport {
ActiveMQQueue queueA = new ActiveMQQueue("QUEUE.A");
ActiveMQQueue queueB = new ActiveMQQueue("QUEUE.B");
private TransportConnector connector;
private ActiveMQConnection connection;
public void test2ndPubisherWithSyncSendConnectionThatIsBlocked() throws Exception {
ActiveMQConnectionFactory factory = (ActiveMQConnectionFactory) createConnectionFactory();
factory.setUseSyncSend(true);
connection = (ActiveMQConnection) factory.createConnection();
connections.add(connection);
connection.start();
// Test sending to Queue A
// 1st send should not block.
fillQueue(queueA);
Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
MessageConsumer consumer = session.createConsumer(queueB);
// Test sending to Queue B it should block.
// Since even though the it's queue limits have not been reached, the connection
// is blocked.
CountDownLatch pubishDoneToQeueuB = asyncSendTo(queueB, "Message 1");
assertTrue( pubishDoneToQeueuB.await(2, TimeUnit.SECONDS) );
TextMessage msg = (TextMessage) consumer.receive();
assertEquals("Message 1", msg.getText());
msg.acknowledge();
pubishDoneToQeueuB = asyncSendTo(queueB, "Message 2");
assertTrue( pubishDoneToQeueuB.await(2, TimeUnit.SECONDS) );
msg = (TextMessage) consumer.receive();
assertEquals("Message 2", msg.getText());
msg.acknowledge();
}
public void test2ndPubisherWithStandardConnectionThatIsBlocked() throws Exception {
ConnectionFactory factory = createConnectionFactory();
connection = (ActiveMQConnection) factory.createConnection();
connections.add(connection);
connection.start();
// Test sending to Queue A
// 1st send should not block.
fillQueue(queueA);
// Test sending to Queue B it should block.
// Since even though the it's queue limits have not been reached, the connection
// is blocked.
CountDownLatch pubishDoneToQeueuB = asyncSendTo(queueB, "Message 1");
assertFalse( pubishDoneToQeueuB.await(2, TimeUnit.SECONDS) );
}
private void fillQueue(final ActiveMQQueue queue) throws JMSException, InterruptedException {
final AtomicBoolean done = new AtomicBoolean(true);
final AtomicBoolean keepGoing = new AtomicBoolean(true);
// Starts an async thread that every time it publishes it sets the done flag to false.
// Once the send starts to block it will not reset the done flag anymore.
new Thread("Fill thread.") {
public void run() {
Session session=null;
try {
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(queue);
producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
while( keepGoing.get() ) {
done.set(false);
producer.send(session.createTextMessage("Hello World"));
}
} catch (JMSException e) {
} finally {
safeClose(session);
}
}
}.start();
while( true ) {
Thread.sleep(1000);
// the producer is blocked once the done flag stays true.
if( done.get() )
break;
done.set(true);
}
keepGoing.set(false);
}
private CountDownLatch asyncSendTo(final ActiveMQQueue queue, final String message) throws JMSException {
final CountDownLatch done = new CountDownLatch(1);
new Thread("Send thread.") {
public void run() {
Session session=null;
try {
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(queue);
producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
producer.send(session.createTextMessage(message));
done.countDown();
} catch (JMSException e) {
} finally {
safeClose(session);
}
}
}.start();
return done;
}
protected BrokerService createBroker() throws Exception {
BrokerService service = new BrokerService();
service.setPersistent(false);
service.setUseJmx(true);
// Setup a destination policy where it takes only 1 message at a time.
PolicyMap policyMap = new PolicyMap();
PolicyEntry policy = new PolicyEntry();
policy.setMemoryLimit(1);
policyMap.setDefaultEntry(policy);
service.setDestinationPolicy(policyMap);
connector = service.addConnector("tcp://localhost:0");
return service;
}
protected void tearDown() throws Exception {
TcpTransport t = (TcpTransport) connection.getTransport().narrow(TcpTransport.class);
t.getTransportListener().onException(new IOException("Disposed."));
connection.getTransport().stop();
super.tearDown();
}
protected ConnectionFactory createConnectionFactory() throws Exception {
return new ActiveMQConnectionFactory(connector.getConnectUri());
}
}