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/**
* Copyright (c) 2004 - 2009 Eike Stepper (Berlin, Germany) and others.
* 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.util.concurrent;
import java.util.concurrent.Executor;
public class OnePendingExecutor implements Executor
{
private Runnable command;
private Thread thread;
public OnePendingExecutor()
{
}
public synchronized void execute(Runnable command)
{
if (this.command != null)
{
throw new IllegalStateException("One command already pending"); //$NON-NLS-1$
}
this.command = command;
if (thread == null)
{
thread = new Thread()
{
@Override
public void run()
{
for (;;)
{
Runnable command;
synchronized (OnePendingExecutor.this)
{
if (OnePendingExecutor.this.command == null)
{
thread = null;
return;
}
command = OnePendingExecutor.this.command;
OnePendingExecutor.this.command = null;
}
command.run();
}
}
};
thread.setDaemon(true);
thread.start();
}
}
}
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