org.hibernate.cache.ehcache.internal.strategy.ReadOnlyEhcacheNaturalIdRegionAccessStrategy 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-only NaturalId region access strategy
*
* @author Chris Dennis
* @author Alex Snaps
*/
public class ReadOnlyEhcacheNaturalIdRegionAccessStrategy
extends AbstractEhcacheAccessStrategy
implements NaturalIdRegionAccessStrategy {
/**
* Create a read-only access strategy accessing the given NaturalId region.
*/
public ReadOnlyEhcacheNaturalIdRegionAccessStrategy(EhcacheNaturalIdRegion region, Settings settings) {
super( region, settings );
}
/**
* {@inheritDoc}
*/
public NaturalIdRegion getRegion() {
return region;
}
/**
* {@inheritDoc}
*/
public Object get(Object key, long txTimestamp) throws CacheException {
return region.get( key );
}
/**
* {@inheritDoc}
*/
public boolean putFromLoad(Object key, Object value, long txTimestamp, Object version, boolean minimalPutOverride)
throws CacheException {
if ( minimalPutOverride && region.contains( key ) ) {
return false;
}
else {
region.put( key, value );
return true;
}
}
public SoftLock lockItem(Object key, Object version) throws UnsupportedOperationException {
return null;
}
/**
* A no-op since this cache is read-only
*/
public void unlockItem(Object key, SoftLock lock) throws CacheException {
region.remove( key );
}
/**
* This cache is asynchronous hence a no-op
*/
public boolean insert(Object key, Object value ) throws CacheException {
return false;
}
/**
* {@inheritDoc}
*/
public boolean afterInsert(Object key, Object value ) throws CacheException {
region.put( key, value );
return true;
}
/**
* Throws UnsupportedOperationException since this cache is read-only
*
* @throws UnsupportedOperationException always
*/
public boolean update(Object key, Object value ) throws UnsupportedOperationException {
throw new UnsupportedOperationException( "Can't write to a readonly object" );
}
/**
* Throws UnsupportedOperationException since this cache is read-only
*
* @throws UnsupportedOperationException always
*/
public boolean afterUpdate(Object key, Object value, SoftLock lock) throws UnsupportedOperationException {
throw new UnsupportedOperationException( "Can't write to a readonly object" );
}
}