Hibernate example source code file (ReadOnlyEhcacheEntityRegionAccessStrategy.java)

This example Hibernate source code file (ReadOnlyEhcacheEntityRegionAccessStrategy.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

abstractehcacheaccessstrategy, cacheexception, cacheexception, can't, entityregion, entityregionaccessstrategy, object, object, readonlyehcacheentityregionaccessstrategy, settings, softlock, softlock, unsupportedoperationexception, unsupportedoperationexception

The Hibernate ReadOnlyEhcacheEntityRegionAccessStrategy.java source code

/*
 * 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;

/**
 * @author Alex Snaps
 */

/**
 * Ehcache specific read-only entity region access strategy
 *
 * @author Chris Dennis
 * @author Alex Snaps
 */
public class ReadOnlyEhcacheEntityRegionAccessStrategy extends AbstractEhcacheAccessStrategy<EhcacheEntityRegion>
		implements EntityRegionAccessStrategy {

	/**
	 * Create a read-only access strategy accessing the given entity region.
	 */
	public ReadOnlyEhcacheEntityRegionAccessStrategy(EhcacheEntityRegion region, Settings settings) {
		super( region, settings );
	}

	/**
	 * {@inheritDoc}
	 */
	public EntityRegion 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;
		}
	}

	/**
	 * Throws UnsupportedOperationException since this cache is read-only
	 *
	 * @throws UnsupportedOperationException always
	 */
	public SoftLock lockItem(Object key, Object version) throws UnsupportedOperationException {
		throw new UnsupportedOperationException( "Can't write to a readonly object" );
	}

	/**
	 * A no-op since this cache is read-only
	 */
	public void unlockItem(Object key, SoftLock lock) throws CacheException {
		//throw new UnsupportedOperationException("Can't write to a readonly object");
	}

	/**
	 * This cache is asynchronous hence a no-op
	 */
	public boolean insert(Object key, Object value, Object version) throws CacheException {
		return false;
	}

	/**
	 * {@inheritDoc}
	 */
	public boolean afterInsert(Object key, Object value, Object version) 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, Object currentVersion, Object previousVersion)
			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, Object currentVersion, Object previousVersion, SoftLock lock)
			throws UnsupportedOperationException {
		throw new UnsupportedOperationException( "Can't write to a readonly object" );
	}
}