/*
* 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.event.internal;
import java.io.Serializable;
import org.hibernate.HibernateException;
import org.hibernate.cache.spi.CacheKey;
import org.hibernate.cache.spi.entry.CollectionCacheEntry;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.internal.CacheHelper;
import org.hibernate.engine.spi.CollectionEntry;
import org.hibernate.engine.spi.PersistenceContext;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.event.spi.InitializeCollectionEvent;
import org.hibernate.event.spi.InitializeCollectionEventListener;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.pretty.MessageHelper;
import org.jboss.logging.Logger;
/**
* @author Gavin King
*/
public class DefaultInitializeCollectionEventListener implements InitializeCollectionEventListener {
private static final CoreMessageLogger LOG = Logger.getMessageLogger( CoreMessageLogger.class, DefaultInitializeCollectionEventListener.class.getName() );
/**
* called by a collection that wants to initialize itself
*/
public void onInitializeCollection(InitializeCollectionEvent event)
throws HibernateException {
PersistentCollection collection = event.getCollection();
SessionImplementor source = event.getSession();
CollectionEntry ce = source.getPersistenceContext().getCollectionEntry(collection);
if (ce==null) throw new HibernateException("collection was evicted");
if ( !collection.wasInitialized() ) {
final boolean traceEnabled = LOG.isTraceEnabled();
if ( traceEnabled ) {
LOG.tracev( "Initializing collection {0}",
MessageHelper.collectionInfoString( ce.getLoadedPersister(), collection, ce.getLoadedKey(), source ) );
LOG.trace( "Checking second-level cache" );
}
final boolean foundInCache = initializeCollectionFromCache(
ce.getLoadedKey(),
ce.getLoadedPersister(),
collection,
source
);
if ( foundInCache ) {
if ( traceEnabled ) {
LOG.trace( "Collection initialized from cache" );
}
}
else {
if ( traceEnabled ) {
LOG.trace( "Collection not cached" );
}
ce.getLoadedPersister().initialize( ce.getLoadedKey(), source );
if ( traceEnabled ) {
LOG.trace( "Collection initialized" );
}
if ( source.getFactory().getStatistics().isStatisticsEnabled() ) {
source.getFactory().getStatisticsImplementor().fetchCollection(
ce.getLoadedPersister().getRole()
);
}
}
}
}
/**
* Try to initialize a collection from the cache
*
* @param id The id of the collection of initialize
* @param persister The collection persister
* @param collection The collection to initialize
* @param source The originating session
* @return true if we were able to initialize the collection from the cache;
* false otherwise.
*/
private boolean initializeCollectionFromCache(
Serializable id,
CollectionPersister persister,
PersistentCollection collection,
SessionImplementor source) {
if ( !source.getLoadQueryInfluencers().getEnabledFilters().isEmpty() && persister.isAffectedByEnabledFilters( source ) ) {
LOG.trace( "Disregarding cached version (if any) of collection due to enabled filters" );
return false;
}
final boolean useCache = persister.hasCache() &&
source.getCacheMode().isGetEnabled();
if (!useCache) return false;
final SessionFactoryImplementor factory = source.getFactory();
final CacheKey ck = source.generateCacheKey( id, persister.getKeyType(), persister.getRole() );
final Object ce = CacheHelper.fromSharedCache( source, ck, persister.getCacheAccessStrategy() );
if ( factory.getStatistics().isStatisticsEnabled() ) {
if (ce == null) {
factory.getStatisticsImplementor()
.secondLevelCacheMiss( persister.getCacheAccessStrategy().getRegion().getName() );
}
else {
factory.getStatisticsImplementor()
.secondLevelCacheHit( persister.getCacheAccessStrategy().getRegion().getName() );
}
}
if ( ce == null ) {
return false;
}
CollectionCacheEntry cacheEntry = (CollectionCacheEntry)persister.getCacheEntryStructure().destructure(ce, factory);
final PersistenceContext persistenceContext = source.getPersistenceContext();
cacheEntry.assemble(collection, persister, persistenceContext.getCollectionOwner(id, persister));
persistenceContext.getCollectionEntry(collection).postInitialize(collection);
// addInitializedCollection(collection, persister, id);
return true;
}
}