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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.qpid.junit.concurrency;
import org.apache.log4j.Logger;
/**
* An example to illustrate the use of the {@link ThreadTestCoordinator} and {@link TestRunnable}s.
*
* <p/><table id="crc"><caption>CRC Card</caption>
* <tr><th> Responsibilities <th> Collaborations
* <tr><td> Demo multi-threaded testing.
* </table>
*
* @author Rupert Smith
*/
public class ThreadTestExample
{
/** Used for logging. */
private static final Logger log = Logger.getLogger(ThreadTestExample.class);
/** Test thread 1. */
TestRunnable testThread1 =
new TestRunnable()
{
public void runWithExceptions() throws Exception
{
log.debug("public void run(): called");
log.info("in testThread0, block 1");
// Wait for t2 to allow t1 to continue.
allow(new int[] { 1 });
waitFor(new int[] { 1 }, false);
log.info("in testThread0, block 2");
// Wait for t2 to allow t1 to continue. T2 is allowed to be blocked elsewhere than giving explicit
// permission to allow t1 to continue.
allow(new int[] { 1 });
waitFor(new int[] { 1 }, true);
log.info("in testThread0, block 3");
// Release thread 2 from waiting on the shared lock.
synchronized (sharedLock)
{
sharedLock.notifyAll();
}
allow(new int[] { 1 });
}
};
/** A shared lock between the test threads. */
final Object sharedLock = new Object();
/** Test thread 2. */
TestRunnable testThread2 =
new TestRunnable()
{
public void runWithExceptions() throws Exception
{
log.debug("public void run(): called");
log.info("in testThread1, block 1");
// Wait for t1 to allow t2 to continue.
allow(new int[] { 0 });
waitFor(new int[] { 0 }, false);
log.info("in testThread1, block 2");
// Wait on another resource. T1 should accept this as permission to continue.
try
{
synchronized (sharedLock)
{
log.debug("in testThread1, waiting on shared lock.");
sharedLock.wait();
}
}
catch (InterruptedException e)
{
// Bail-out with a runtime if this happens.
throw new RuntimeException("Interrupted whilst waiting for shared lock.", e);
}
log.info("in testThread1, finished waiting on shared lock.");
// allow(new int[] { 0 });
// Wait for t1 to allow t2 to continue.
waitFor(new int[] { 0 }, false);
log.info("in testThread1, block 3");
allow(new int[] { 0 });
}
};
/**
* Executes the test threads with coordination.
*
* @param args Ignored.
*/
public void main(String[] args)
{
ThreadTestCoordinator tt = new ThreadTestCoordinator(2);
tt.addTestThread(testThread1, 0);
tt.addTestThread(testThread2, 1);
tt.setDeadlockTimeout(500);
tt.run();
String errorMessage = tt.joinAndRetrieveMessages();
// Print any error messages or exceptions.
log.info(errorMessage);
if (!tt.getExceptions().isEmpty())
{
for (Exception e : tt.getExceptions())
{
log.warn("Exception thrown during test thread: ", e);
}
}
}
}
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