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/*******************************************************************************
* Copyright (c) 2011 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.runtime.concurrent.factories;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import org.eclipse.core.runtime.Assert;
/**
* A thread factory implementation creating a single thread only.
*/
public class SingleThreadThreadFactory implements ThreadFactory {
private final ThreadGroup threadGroup;
private final String threadName;
private Thread thread;
private final AtomicInteger threadNumber = new AtomicInteger(1);
/**
* Constructor.
*
* @param namePrefix
* The name prefix to name the created threads. Must not be
* <code>null</code>.
*/
public SingleThreadThreadFactory(String namePrefix) {
Assert.isNotNull(namePrefix);
// Determine the thread group. Use the security manager if available.
this.threadGroup = (System.getSecurityManager() != null) ? System.getSecurityManager().getThreadGroup() : Thread.currentThread().getThreadGroup();
// Set the thread name prefix
this.threadName = ("".equals(namePrefix.trim()) ? "Executor" : namePrefix) + " - " + threadNumber.getAndIncrement(); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
/*
* (non-Javadoc)
*
* @see java.util.concurrent.ThreadFactory#newThread(java.lang.Runnable)
*/
@Override
public Thread newThread(Runnable r) {
// The thread can be created on once. If called a second time,
// this factory cannot create any additional threads.
if (thread != null) return null;
// Create the thread with the desired name and the current thread number
thread = new Thread(threadGroup, r, threadName);
thread.setDaemon(false);
thread.setPriority(Thread.NORM_PRIORITY);
// Return the thread
return thread;
}
/**
* Returns the single created thread instance or <code>null</code> if
* {@link #newThread(Runnable)} have not been called yet.
*
* @return The single created thread instance or <code>null</code>.
*/
public Thread getThread() {
return thread;
}
}
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