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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.event.internal;
import java.io.Serializable;
import org.hibernate.HibernateException;
import org.hibernate.cache.spi.access.CollectionDataAccess;
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.CoreLogging;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.pretty.MessageHelper;
/**
* @author Gavin King
*/
public class DefaultInitializeCollectionEventListener implements InitializeCollectionEventListener {
private static final CoreMessageLogger LOG = CoreLogging.messageLogger( DefaultInitializeCollectionEventListener.class );
/**
* 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().getStatistics().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().hasEnabledFilters()
&& 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 CollectionDataAccess cacheAccessStrategy = persister.getCacheAccessStrategy();
final Object ck = cacheAccessStrategy.generateCacheKey( id, persister, factory, source.getTenantIdentifier() );
final Object ce = CacheHelper.fromSharedCache( source, ck, persister.getCacheAccessStrategy() );
if ( factory.getStatistics().isStatisticsEnabled() ) {
if ( ce == null ) {
factory.getStatistics().collectionCacheMiss(
persister.getNavigableRole(),
cacheAccessStrategy.getRegion().getName()
);
}
else {
factory.getStatistics().collectionCacheHit(
persister.getNavigableRole(),
cacheAccessStrategy.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;
}
}