org.hibernate.cache.ehcache.internal.strategy.ReadWriteEhcacheNaturalIdRegionAccessStrategy Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2011, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.cache.ehcache.internal.strategy;
import org.hibernate.cache.CacheException;
import org.hibernate.cache.ehcache.internal.regions.EhcacheNaturalIdRegion;
import org.hibernate.cache.spi.NaturalIdRegion;
import org.hibernate.cache.spi.access.NaturalIdRegionAccessStrategy;
import org.hibernate.cache.spi.access.SoftLock;
import org.hibernate.cfg.Settings;
/**
* Ehcache specific read/write NaturalId region access strategy
*
* @author Chris Dennis
* @author Alex Snaps
*/
public class ReadWriteEhcacheNaturalIdRegionAccessStrategy
extends AbstractReadWriteEhcacheAccessStrategy
implements NaturalIdRegionAccessStrategy {
/**
* Create a read/write access strategy accessing the given NaturalId region.
*/
public ReadWriteEhcacheNaturalIdRegionAccessStrategy(EhcacheNaturalIdRegion region, Settings settings) {
super( region, settings );
}
/**
* {@inheritDoc}
*/
public NaturalIdRegion getRegion() {
return region;
}
/**
* A no-op since this is an asynchronous cache access strategy.
*/
public boolean insert(Object key, Object value ) throws CacheException {
return false;
}
/**
* {@inheritDoc}
*
* Inserts will only succeed if there is no existing value mapped to this key.
*/
public boolean afterInsert(Object key, Object value ) throws CacheException {
region.writeLock( key );
try {
Lockable item = (Lockable) region.get( key );
if ( item == null ) {
region.put( key, new Item( value, null, region.nextTimestamp() ) );
return true;
}
else {
return false;
}
}
finally {
region.writeUnlock( key );
}
}
/**
* A no-op since this is an asynchronous cache access strategy.
*/
public boolean update(Object key, Object value )
throws CacheException {
return false;
}
/**
* {@inheritDoc}
*
* Updates will only succeed if this entry was locked by this transaction and exclusively this transaction for the
* duration of this transaction. It is important to also note that updates will fail if the soft-lock expired during
* the course of this transaction.
*/
public boolean afterUpdate(Object key, Object value, SoftLock lock) throws CacheException {
//what should we do with previousVersion here?
region.writeLock( key );
try {
Lockable item = (Lockable) region.get( key );
if ( item != null && item.isUnlockable( lock ) ) {
Lock lockItem = (Lock) item;
if ( lockItem.wasLockedConcurrently() ) {
decrementLock( key, lockItem );
return false;
}
else {
region.put( key, new Item( value, null, region.nextTimestamp() ) );
return true;
}
}
else {
handleLockExpiry( key, item );
return false;
}
}
finally {
region.writeUnlock( key );
}
}
}