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/*
* 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.EhcacheEntityRegion;
import org.hibernate.cache.spi.EntityRegion;
import org.hibernate.cache.spi.access.EntityRegionAccessStrategy;
import org.hibernate.cache.spi.access.SoftLock;
import org.hibernate.cfg.Settings;
/**
* Ehcache specific read-only entity region access strategy
*
* @author Chris Dennis
* @author Alex Snaps
*/
public class ReadOnlyEhcacheEntityRegionAccessStrategy extends AbstractEhcacheAccessStrategy
implements EntityRegionAccessStrategy {
/**
* Create a read-only access strategy accessing the given entity region.
*
* @param region The wrapped region
* @param settings The Hibernate settings
*/
public ReadOnlyEhcacheEntityRegionAccessStrategy(EhcacheEntityRegion region, Settings settings) {
super( region, settings );
}
@Override
public EntityRegion getRegion() {
return region();
}
@Override
public Object get(Object key, long txTimestamp) throws CacheException {
return region().get( key );
}
@Override
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;
}
}
@Override
public SoftLock lockItem(Object key, Object version) throws UnsupportedOperationException {
return null;
}
/**
* {@inheritDoc}
*
* A no-op since this cache is read-only
*/
@Override
public void unlockItem(Object key, SoftLock lock) throws CacheException {
evict( key );
}
/**
* {@inheritDoc}
*
* This cache is asynchronous hence a no-op
*/
@Override
public boolean insert(Object key, Object value, Object version) throws CacheException {
return false;
}
@Override
public boolean afterInsert(Object key, Object value, Object version) throws CacheException {
region().put( key, value );
return true;
}
/**
* {@inheritDoc}
*
* Throws UnsupportedOperationException since this cache is read-only
*
* @throws UnsupportedOperationException always
*/
@Override
public boolean update(Object key, Object value, Object currentVersion, Object previousVersion)
throws UnsupportedOperationException {
throw new UnsupportedOperationException( "Can't write to a readonly object" );
}
/**
* {@inheritDoc}
*
* Throws UnsupportedOperationException since this cache is read-only
*
* @throws UnsupportedOperationException always
*/
@Override
public boolean afterUpdate(Object key, Object value, Object currentVersion, Object previousVersion, SoftLock lock)
throws UnsupportedOperationException {
throw new UnsupportedOperationException( "Can't write to a readonly object" );
}
}
