org.jboss.cache.lock.LockStrategyReadCommitted Maven / Gradle / Ivy
/*
* 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.Sync;
/**
* Transaction isolation level of READ_COMMITTED. Similar to read/write lock, but writers are not blocked on readers
* It prevents dirty read only.
* Dirty read allows (t1) write and then (t2) read within two separate threads, all without
* transaction commit.
*
* @author Ben Wang
* @version $Revision: 1.6 $
*/
public class LockStrategyReadCommitted implements LockStrategy
{
private NonBlockingWriterLock lock_;
public LockStrategyReadCommitted()
{
lock_ = new NonBlockingWriterLock();
}
/**
* @see org.jboss.cache.lock.LockStrategy#readLock()
*/
public Sync readLock()
{
return lock_.readLock();
}
/**
* @see org.jboss.cache.lock.LockStrategy#upgradeLockAttempt(long)
*/
public Sync upgradeLockAttempt(long msecs) throws UpgradeException
{
return lock_.upgradeLockAttempt(msecs);
}
/**
* @see org.jboss.cache.lock.LockStrategy#writeLock()
*/
public Sync writeLock()
{
return lock_.writeLock();
}
}