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/*
* 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.envers.reader;
import java.util.Map;
import org.jboss.logging.Logger;
import org.hibernate.envers.internal.EnversMessageLogger;
import org.hibernate.envers.tools.Triple;
import static org.hibernate.envers.tools.Tools.newHashMap;
import static org.hibernate.envers.tools.Triple.make;
/**
* First level cache for versioned entities, versions reader-scoped. Each entity is uniquely identified by a
* revision number and entity id.
* @author Adam Warski (adam at warski dot org)
* @author Hernán Chanfreau
*/
public class FirstLevelCache {
public static final EnversMessageLogger LOG = Logger.getMessageLogger(EnversMessageLogger.class, FirstLevelCache.class.getName());
/**
* cache for resolve an object for a given id, revision and entityName.
*/
private final Map, Object> cache;
/**
* used to resolve the entityName for a given id, revision and entity.
*/
private final Map, String> entityNameCache;
public FirstLevelCache() {
cache = newHashMap();
entityNameCache = newHashMap();
}
public Object get(String entityName, Number revision, Object id) {
LOG.debugf("Resolving object from First Level Cache: EntityName:%s - primaryKey:%s - revision:%s", entityName, id, revision);
return cache.get(make(entityName, revision, id));
}
public void put(String entityName, Number revision, Object id, Object entity) {
LOG.debugf("Caching entity on First Level Cache: - primaryKey:%s - revision:%s - entityName:%s", id, revision, entityName);
cache.put(make(entityName, revision, id), entity);
}
public boolean contains(String entityName, Number revision, Object id) {
return cache.containsKey(make(entityName, revision, id));
}
/**
* Adds the entityName into the cache. The key is a triple make with primaryKey, revision and entity
* @param id primaryKey
* @param revision revision number
* @param entity object retrieved by envers
* @param entityName value of the cache
*/
public void putOnEntityNameCache(Object id, Number revision, Object entity, String entityName) {
LOG.debugf("Caching entityName on First Level Cache: - primaryKey:%s - revision:%s - entity:%s -> entityName:%s",
id,
revision,
entity.getClass().getName(),
entityName);
entityNameCache.put(make(id, revision, entity), entityName);
}
/**
* Gets the entityName from the cache. The key is a triple make with primaryKey, revision and entity
*
* @param id primaryKey
* @param revision revision number
* @param entity object retrieved by envers
*
* @return The appropriate entity name
*/
public String getFromEntityNameCache(Object id, Number revision, Object entity) {
LOG.debugf("Trying to resolve entityName from First Level Cache: - primaryKey:%s - revision:%s - entity:%s",
id,
revision,
entity);
return entityNameCache.get(make(id, revision, entity));
}
/**
* @param id primaryKey
* @param revision revision number
* @param entity object retrieved by envers
* @return true if entityNameCache contains the triple
*/
public boolean containsEntityName(Object id, Number revision, Object entity) {
return entityNameCache.containsKey(make(id, revision, entity));
}
}