swarmcacheprovider.java

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2007, Red Hat Middleware LLC 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 Middleware LLC.
 *
 * 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;

import net.sf.swarmcache.CacheConfiguration;
import net.sf.swarmcache.CacheConfigurationManager;
import net.sf.swarmcache.CacheFactory;
import net.sf.swarmcache.ObjectCache;

import java.util.Properties;

/**
 * Support for SwarmCache replicated cache. SwarmCache does not support
 * locking, so strict "read-write" semantics are unsupported.
 * 
 * @author Jason Carreira
 */
public class SwarmCacheProvider implements CacheProvider {

	private CacheFactory factory;

    public Cache buildCache(String regionName, Properties properties) throws CacheException {
        ObjectCache cache = factory.createCache(regionName);
        if (cache==null) {
	        throw new CacheException("SwarmCache did not create a cache: " + regionName);
        }
        return new SwarmCache(cache, regionName);
    }

    public long nextTimestamp() {
        return System.currentTimeMillis() / 100;
    }

	/**
	 * Callback to perform any necessary initialization of the underlying cache implementation
	 * during SessionFactory construction.
	 *
	 * @param properties current configuration settings.
	 */
	public void start(Properties properties) throws CacheException {
        CacheConfiguration config = CacheConfigurationManager.getConfig(properties);
        factory = new CacheFactory(config);
	}

	/**
	 * Callback to perform any necessary cleanup of the underlying cache implementation
	 * during SessionFactory.close().
	 */
	public void stop() {
		if (factory != null) {
			factory.shutdown();
			factory = null;
		}
	}

	public boolean isMinimalPutsEnabledByDefault() {
		return true;
	}

}