/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, 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.spi;
import java.util.Comparator;
/**
* Contract for sources of optimistically lockable data sent to the second level
* cache.
* <p/>
* 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?
* <p/>
* 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.
* <p/>
* May return null <b>if</b> {@link #isVersioned()} returns false.
* @return Comparator used to compare two different version values.
*/
public Comparator getVersionComparator();
}