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/*******************************************************************************
* Copyright (c) 2004, 2005, 2006 Eike Stepper, Sympedia Methods and Tools.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*******************************************************************************/
package org.eclipse.net4j.test.util;
import junit.framework.Assert;
public abstract class BlockingDetector
{
public static final long DEFAULT_WAIT_MILLIS = 100;
protected Thread thread;
protected BlockableOperationException exception;
public BlockingDetector(Object target, Object monitor, boolean blockingExpected) throws Throwable
{
this(target, monitor, blockingExpected, DEFAULT_WAIT_MILLIS);
}
public BlockingDetector(Object target, Object monitor, boolean blockingExpected, long waitMillis)
throws Throwable
{
startOperation(target);
try
{
Thread.sleep(waitMillis);
}
catch (InterruptedException ex)
{
throw new BlockableOperationException(ex);
}
if (exception != null)
{
throw exception.getCause();
}
boolean alive = thread.isAlive();
if (alive) synchronized (monitor)
{
monitor.notifyAll();
}
if (blockingExpected)
{
Assert.assertTrue("blocking expected", alive);
}
else
{
Assert.assertTrue("no blocking expected", !alive);
}
}
public void startOperation(final Object target)
{
thread = new Thread()
{
public void run()
{
try
{
blockableOperation(target);
}
catch (Exception ex)
{
exception = new BlockableOperationException(ex);
throw exception;
}
}
};
thread.start();
}
protected abstract void blockableOperation(Object target) throws Exception;
private static class BlockableOperationException extends RuntimeException
{
private static final long serialVersionUID = 1L;
public BlockableOperationException(Exception ex)
{
super(ex);
}
}
}
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