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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, 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 java.util.Comparator;

/**
 * Contract for sources of optimistically lockable data sent to the second level
 * cache.
 * 

* Note currently {@link org.hibernate.persister.entity.EntityPersister}s are * the only viable source. * * @author Steve Ebersole */ public interface OptimisticCacheSource { /** * Is the data to be cached considered versioned? *

* If true, it is illegal for {@link #getVersionComparator} to return * null. * * @return True if the data is versioned; false otherwise. */ public boolean isVersioned(); /** * Get the comparator used to compare two different version values. *

* May return null if {@link #isVersioned()} returns false. * @return */ public Comparator getVersionComparator(); }





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