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* 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.net.URI;
import java.util.concurrent.Semaphore;
import javax.jms.Message;
import javax.jms.MessageListener;
import org.apache.activemq.JmsMultipleBrokersTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.network.DemandForwardingBridgeSupport;
import org.apache.activemq.util.MessageIdList;
import org.apache.activemq.util.Wait;
/**
* This test demonstrates a bug in {@link DemandForwardingBridgeSupport} when
* bridges are VM-to-VM. Specifically, memory usage from the local broker is
* manipulated by the remote broker.
*/
public class AMQ4147Test extends JmsMultipleBrokersTestSupport {
/**
* This test demonstrates the bug: namely, when a message is bridged over
* the VMTransport, its memory usage continues to refer to the originating
* broker. As a result, memory usage is never accounted for on the remote
* broker, and the local broker's memory usage is only decreased once the
* message is consumed on the remote broker.
*/
public void testVMTransportRemoteMemoryUsage() throws Exception {
BrokerService broker1 = createBroker(new URI(
"broker:(vm://broker1)/broker1?persistent=false&useJmx=false"));
BrokerService broker2 = createBroker(new URI(
"broker:(vm://broker2)/broker2?persistent=false&useJmx=false"));
startAllBrokers();
// Forward messages from broker1 to broker2 over the VM transport.
bridgeBrokers("broker1", "broker2").start();
// Verify that broker1 and broker2's test queues have no memory usage.
ActiveMQDestination testQueue = createDestination(
AMQ4147Test.class.getSimpleName() + ".queue", false);
final Destination broker1TestQueue = broker1.getDestination(testQueue);
final Destination broker2TestQueue = broker2.getDestination(testQueue);
assertEquals(0, broker1TestQueue.getMemoryUsage().getUsage());
assertEquals(0, broker2TestQueue.getMemoryUsage().getUsage());
// Produce a message to broker1's test queue and verify that broker1's
// memory usage has increased, but broker2 still has no memory usage.
sendMessages("broker1", testQueue, 1);
assertTrue(broker1TestQueue.getMemoryUsage().getUsage() > 0);
assertEquals(0, broker2TestQueue.getMemoryUsage().getUsage());
// Create a consumer on broker2 that is synchronized to allow detection
// of "in flight" messages to the consumer.
MessageIdList broker2Messages = getBrokerMessages("broker2");
final Semaphore consumerReady = new Semaphore(0);
final Semaphore consumerProceed = new Semaphore(0);
broker2Messages.setParent(new MessageListener() {
@Override
public void onMessage(Message message) {
consumerReady.release();
try {
consumerProceed.acquire();
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
});
createConsumer("broker2", testQueue);
// Verify that when broker2's consumer receives the message, the memory
// usage has moved broker1 to broker2. The first assertion is expected
// to fail due to the bug; the try/finally ensures the consumer is
// released prior to failure so that the broker can shut down.
consumerReady.acquire();
try {
assertTrue("Memory Usage Should be Zero: ", Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
return broker1TestQueue.getMemoryUsage().getUsage() == 0;
}
}));
assertTrue(broker2TestQueue.getMemoryUsage().getUsage() > 0);
} finally {
// Consume the message and verify that there is no more memory usage.
consumerProceed.release();
}
assertTrue("Memory Usage Should be Zero: ", Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
return broker1TestQueue.getMemoryUsage().getUsage() == 0;
}
}));
assertTrue("Memory Usage Should be Zero: ", Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
return broker2TestQueue.getMemoryUsage().getUsage() == 0;
}
}));
}
/**
* This test demonstrates that the bug is VMTransport-specific and does not
* occur when bridges occur using other protocols.
*/
public void testTcpTransportRemoteMemoryUsage() throws Exception {
BrokerService broker1 = createBroker(new URI(
"broker:(vm://broker1)/broker1?persistent=false&useJmx=false"));
BrokerService broker2 = createBroker(new URI(
"broker:(tcp://localhost:0)/broker2?persistent=false&useJmx=false"));
startAllBrokers();
// Forward messages from broker1 to broker2 over the TCP transport.
bridgeBrokers("broker1", "broker2").start();
// Verify that broker1 and broker2's test queues have no memory usage.
ActiveMQDestination testQueue = createDestination(
AMQ4147Test.class.getSimpleName() + ".queue", false);
final Destination broker1TestQueue = broker1.getDestination(testQueue);
final Destination broker2TestQueue = broker2.getDestination(testQueue);
assertEquals(0, broker1TestQueue.getMemoryUsage().getUsage());
assertEquals(0, broker2TestQueue.getMemoryUsage().getUsage());
// Produce a message to broker1's test queue and verify that broker1's
// memory usage has increased, but broker2 still has no memory usage.
sendMessages("broker1", testQueue, 1);
assertTrue(broker1TestQueue.getMemoryUsage().getUsage() > 0);
assertEquals(0, broker2TestQueue.getMemoryUsage().getUsage());
// Create a consumer on broker2 that is synchronized to allow detection
// of "in flight" messages to the consumer.
MessageIdList broker2Messages = getBrokerMessages("broker2");
final Semaphore consumerReady = new Semaphore(0);
final Semaphore consumerProceed = new Semaphore(0);
broker2Messages.setParent(new MessageListener() {
@Override
public void onMessage(Message message) {
consumerReady.release();
try {
consumerProceed.acquire();
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
});
createConsumer("broker2", testQueue);
// Verify that when broker2's consumer receives the message, the memory
// usage has moved broker1 to broker2.
consumerReady.acquire();
try {
assertTrue("Memory Usage Should be Zero: ", Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
return broker1TestQueue.getMemoryUsage().getUsage() == 0;
}
}));
assertTrue(broker2TestQueue.getMemoryUsage().getUsage() > 0);
} finally {
// Consume the message and verify that there is no more memory usage.
consumerProceed.release();
}
// Pause to allow ACK to be processed.
assertTrue("Memory Usage Should be Zero: ", Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
return broker1TestQueue.getMemoryUsage().getUsage() == 0;
}
}));
assertTrue("Memory Usage Should be Zero: ", Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
return broker2TestQueue.getMemoryUsage().getUsage() == 0;
}
}));
}
}