ActiveMQ example source code file (VMTransportClosureTest.java)

This example ActiveMQ source code file (VMTransportClosureTest.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

activemqconnection, brokerservice, brokerservice, embeddedbrokertestsupport, exception, exception, io, log, log, logfactory, messageproducer, num_attempts, num_attempts, override, transportlistener

The ActiveMQ VMTransportClosureTest.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.bugs;

import java.io.IOException;

import javax.jms.MessageProducer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.EmbeddedBrokerTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ShutdownInfo;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.transport.TransportFactory;
import org.apache.activemq.transport.TransportListener;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class VMTransportClosureTest extends EmbeddedBrokerTestSupport {
	private static final Log LOG = LogFactory
			.getLog(VMTransportClosureTest.class);
	private static final long MAX_TEST_TIME_MILLIS = 300000; // 5min
	private static final int NUM_ATTEMPTS = 100000;

	public void setUp() throws Exception {
		setAutoFail(true);
		setMaxTestTime(MAX_TEST_TIME_MILLIS);
		super.setUp();
	}

	/**
	 * EmbeddedBrokerTestSupport.createBroker() binds the broker to a VM
	 * transport address, which results in a call to
	 * VMTransportFactory.doBind(location):
	 * <p>
	 * <code>
	 *     public TransportServer doBind(URI location) throws IOException {
	 *        return bind(location, false);
	 *}
	 *</code>
	 * </p>
	 * As a result, VMTransportServer.disposeOnDisconnect is <code>false.
	 * To expose the bug, we need to have VMTransportServer.disposeOnDisconnect
	 * <code>true, which is the case when the VMTransportServer is not
	 * already bound when the first connection is made.
	 */
	@Override
	protected BrokerService createBroker() throws Exception {
		BrokerService answer = new BrokerService();
		answer.setPersistent(isPersistent());
		// answer.addConnector(bindAddress);
		return answer;
	}

	/**
	 * This test demonstrates how the "disposeOnDisonnect" feature of
	 * VMTransportServer can incorrectly close all VM connections to the local
	 * broker.
	 */
	public void testPrematureClosure() throws Exception {

		// Open a persistent connection to the local broker. The persistent
		// connection is maintained through the test and should prevent the
		// VMTransportServer from stopping itself when the local transport is
		// closed.
		ActiveMQConnection persistentConn = (ActiveMQConnection) createConnection();
		persistentConn.start();
		Session session = persistentConn.createSession(true,
				Session.SESSION_TRANSACTED);
		MessageProducer producer = session.createProducer(destination);

		for (int i = 0; i < NUM_ATTEMPTS; i++) {
			LOG.info("Attempt: " + i);

			// Open and close a local transport connection. As is done by by
			// most users of the transport, ensure that the transport is stopped
			// when closed by the peer (via ShutdownInfo). Closing the local
			// transport should not affect the persistent connection.
			final Transport localTransport = TransportFactory.connect(broker
					.getVmConnectorURI());
			localTransport.setTransportListener(new TransportListener() {
				public void onCommand(Object command) {
					if (command instanceof ShutdownInfo) {
						try {
							localTransport.stop();
						} catch (Exception ex) {
							throw new RuntimeException(ex);
						}
					}
				}

				public void onException(IOException error) {
					// ignore
				}

				public void transportInterupted() {
					// ignore
				}

				public void transportResumed() {
					// ignore
				}
			});

			localTransport.start();
			localTransport.stop();

			// Ensure that the persistent connection is still usable.
			producer.send(session.createMessage());
			session.rollback();
		}

		persistentConn.close();
	}
}