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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.envers.reader;
import static org.hibernate.envers.tools.Tools.newHashMap;
import static org.hibernate.envers.tools.Triple.make;
import java.util.Map;
import org.hibernate.envers.tools.Triple;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 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 {
private static final Logger log = LoggerFactory.getLogger(FirstLevelCache.class);
/**
* 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) {
if (log.isDebugEnabled()) {
log.debug("Resolving object from First Level Cache: "
+ "EntytiName:" + entityName + " - primaryKey:" + id
+ " - revision:" + revision);
}
return cache.get(make(entityName, revision, id));
}
public void put(String entityName, Number revision, Object id, Object entity) {
if (log.isDebugEnabled()) {
log.debug("Caching entity on First Level Cache: "
+ " - primaryKey:" + id + " - revision:" + revision
+ " - entityName:" + 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 entityName, value of the cache
* @param id, primaryKey
* @param revision, revision number
* @param entity, object retrieved by envers
*/
public void putOnEntityNameCache(Object id, Number revision, Object entity, String entityName) {
if (log.isDebugEnabled()) {
log.debug("Caching entityName on First Level Cache: "
+ " - primaryKey:" + id + " - revision:" + revision
+ " - entity:" + entity.getClass().getName() + " -> entityName:" + 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 entityName, value of the cache
* @param id, primaryKey
* @param revision, revision number
* @param entity, object retrieved by envers
*/
public String getFromEntityNameCache(Object id, Number revision, Object entity) {
if (log.isDebugEnabled()) {
log.debug("Trying to resolve entityName from First Level Cache:"
+ " - primaryKey:" + id + " - revision:" + revision
+ " - entity:" + 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));
}
}