/*
* JBoss, the OpenSource J2EE webOS
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.cache.lock;
import EDU.oswego.cs.dl.util.concurrent.FIFOSemaphore;
import EDU.oswego.cs.dl.util.concurrent.Sync;
//import org.jboss.logging.Logger;
/**
* Simple lock that does not differentiate read and write lock. All locks are obtained FIFO.
* Just implements from Doug Lea's concurrent package. This class is used as a delegate for LockStrategy
* is transaction isolation level.
*
* @author <a href="mailto:bwang00@sourceforge.net">Ben Wang</a> July 15, 2003
* @version $Revision: 13 $
*/
public class SimpleLock
{
// Log log=LogFactory.getLog(getClass());
private int permits_;
private FIFOSemaphore sem_;
public SimpleLock()
{
permits_ = 1;
sem_ = new FIFOSemaphore(permits_);
}
/**
* @see org.jboss.cache.lock.LockStrategy#readLock()
*/
public Sync readLock()
{
return sem_;
}
/**
* @see org.jboss.cache.lock.LockStrategy#upgradeLockAttempt(long)
*/
public Sync upgradeLockAttempt(long msecs)
{
return sem_;
}
/**
* @see org.jboss.cache.lock.LockStrategy#writeLock()
*/
public Sync writeLock()
{
return sem_;
}
}