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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.pool;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import junit.framework.TestCase;
public class ReferenceCountingExecutorServiceTest extends TestCase
{
private ReferenceCountingExecutorService _executorService = ReferenceCountingExecutorService.getInstance(); // Class under test
private ThreadFactory _beforeExecutorThreadFactory;
@Override
protected void setUp() throws Exception
{
super.setUp();
_beforeExecutorThreadFactory = _executorService.getThreadFactory();
}
@Override
protected void tearDown() throws Exception
{
super.tearDown();
_executorService.setThreadFactory(_beforeExecutorThreadFactory);
}
/**
* Tests that the ReferenceCountingExecutorService correctly manages the reference count.
*/
public void testReferenceCounting() throws Exception
{
final int countBefore = _executorService.getReferenceCount();
try
{
_executorService.acquireExecutorService();
_executorService.acquireExecutorService();
assertEquals("Reference count should now be +2", countBefore + 2, _executorService.getReferenceCount());
}
finally
{
_executorService.releaseExecutorService();
_executorService.releaseExecutorService();
}
assertEquals("Reference count should have returned to the initial value", countBefore, _executorService.getReferenceCount());
}
/**
* Tests that the executor creates and executes a task using the default thread pool.
*/
public void testExecuteCommandWithDefaultExecutorThreadFactory() throws Exception
{
final CountDownLatch latch = new CountDownLatch(1);
final Set<ThreadGroup> threadGroups = new HashSet<ThreadGroup>();
_executorService.acquireExecutorService();
try
{
_executorService.getPool().execute(createRunnable(latch, threadGroups));
latch.await(3, TimeUnit.SECONDS);
assertTrue("Expect that executor created a thread using default thread factory",
threadGroups.contains(Thread.currentThread().getThreadGroup()));
}
finally
{
_executorService.releaseExecutorService();
}
}
/**
* Tests that the executor creates and executes a task using an overridden thread pool.
*/
public void testExecuteCommandWithOverriddenExecutorThreadFactory() throws Exception
{
final CountDownLatch latch = new CountDownLatch(1);
final ThreadGroup expectedThreadGroup = new ThreadGroup("junit");
_executorService.setThreadFactory(new ThreadGroupChangingThreadFactory(expectedThreadGroup));
_executorService.acquireExecutorService();
final Set<ThreadGroup> threadGroups = new HashSet<ThreadGroup>();
try
{
_executorService.getPool().execute(createRunnable(latch, threadGroups));
latch.await(3, TimeUnit.SECONDS);
assertTrue("Expect that executor created a thread using overridden thread factory",
threadGroups.contains(expectedThreadGroup));
}
finally
{
_executorService.releaseExecutorService();
}
}
private Runnable createRunnable(final CountDownLatch latch, final Set<ThreadGroup> threadGroups)
{
return new Runnable()
{
public void run()
{
threadGroups.add(Thread.currentThread().getThreadGroup());
latch.countDown();
}
};
}
private final class ThreadGroupChangingThreadFactory implements ThreadFactory
{
private final ThreadGroup _newGroup;
private ThreadGroupChangingThreadFactory(final ThreadGroup newGroup)
{
this._newGroup = newGroup;
}
public Thread newThread(Runnable r)
{
return new Thread(_newGroup, r);
}
}
}
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