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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.event.def;
import java.io.Serializable;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.HibernateException;
import org.hibernate.PersistentObjectException;
import org.hibernate.UnresolvableObjectException;
import org.hibernate.cache.CacheKey;
import org.hibernate.engine.Cascade;
import org.hibernate.engine.CascadingAction;
import org.hibernate.engine.EntityEntry;
import org.hibernate.engine.EntityKey;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.event.EventSource;
import org.hibernate.event.RefreshEvent;
import org.hibernate.event.RefreshEventListener;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.type.AbstractComponentType;
import org.hibernate.type.CollectionType;
import org.hibernate.type.Type;
import org.hibernate.util.IdentityMap;
/**
* Defines the default refresh event listener used by hibernate for refreshing entities
* in response to generated refresh events.
*
* @author Steve Ebersole
*/
public class DefaultRefreshEventListener implements RefreshEventListener {
private static final Logger log = LoggerFactory.getLogger(DefaultRefreshEventListener.class);
public void onRefresh(RefreshEvent event) throws HibernateException {
onRefresh( event, IdentityMap.instantiate(10) );
}
/**
* Handle the given refresh event.
*
* @param event The refresh event to be handled.
*/
public void onRefresh(RefreshEvent event, Map refreshedAlready) {
final EventSource source = event.getSession();
boolean isTransient = ! source.contains( event.getObject() );
if ( source.getPersistenceContext().reassociateIfUninitializedProxy( event.getObject() ) ) {
if ( isTransient ) {
source.setReadOnly( event.getObject(), source.isDefaultReadOnly() );
}
return;
}
final Object object = source.getPersistenceContext().unproxyAndReassociate( event.getObject() );
if ( refreshedAlready.containsKey(object) ) {
log.trace("already refreshed");
return;
}
final EntityEntry e = source.getPersistenceContext().getEntry( object );
final EntityPersister persister;
final Serializable id;
if ( e == null ) {
persister = source.getEntityPersister(null, object); //refresh() does not pass an entityName
id = persister.getIdentifier( object, event.getSession() );
if ( log.isTraceEnabled() ) {
log.trace(
"refreshing transient " +
MessageHelper.infoString( persister, id, source.getFactory() )
);
}
EntityKey key = new EntityKey( id, persister, source.getEntityMode() );
if ( source.getPersistenceContext().getEntry(key) != null ) {
throw new PersistentObjectException(
"attempted to refresh transient instance when persistent instance was already associated with the Session: " +
MessageHelper.infoString(persister, id, source.getFactory() )
);
}
}
else {
if ( log.isTraceEnabled() ) {
log.trace(
"refreshing " +
MessageHelper.infoString( e.getPersister(), e.getId(), source.getFactory() )
);
}
if ( !e.isExistsInDatabase() ) {
throw new HibernateException( "this instance does not yet exist as a row in the database" );
}
persister = e.getPersister();
id = e.getId();
}
// cascade the refresh prior to refreshing this entity
refreshedAlready.put(object, object);
new Cascade(CascadingAction.REFRESH, Cascade.BEFORE_REFRESH, source)
.cascade( persister, object, refreshedAlready );
if ( e != null ) {
EntityKey key = new EntityKey( id, persister, source.getEntityMode() );
source.getPersistenceContext().removeEntity(key);
if ( persister.hasCollections() ) new EvictVisitor( source ).process(object, persister);
}
if ( persister.hasCache() ) {
final CacheKey ck = new CacheKey(
id,
persister.getIdentifierType(),
persister.getRootEntityName(),
source.getEntityMode(),
source.getFactory()
);
persister.getCacheAccessStrategy().evict( ck );
}
evictCachedCollections( persister, id, source.getFactory() );
String previousFetchProfile = source.getFetchProfile();
source.setFetchProfile("refresh");
Object result = persister.load( id, object, event.getLockOptions(), source );
// Keep the same read-only/modifiable setting for the entity that it had before refreshing;
// If it was transient, then set it to the default for the source.
if ( result != null ) {
if ( ! persister.isMutable() ) {
// this is probably redundant; it should already be read-only
source.setReadOnly( result, true );
}
else {
source.setReadOnly( result, ( e == null ? source.isDefaultReadOnly() : e.isReadOnly() ) );
}
}
source.setFetchProfile(previousFetchProfile);
UnresolvableObjectException.throwIfNull( result, id, persister.getEntityName() );
}
private void evictCachedCollections(EntityPersister persister, Serializable id, SessionFactoryImplementor factory) {
evictCachedCollections( persister.getPropertyTypes(), id, factory );
}
private void evictCachedCollections(Type[] types, Serializable id, SessionFactoryImplementor factory)
throws HibernateException {
for ( int i = 0; i < types.length; i++ ) {
if ( types[i].isCollectionType() ) {
factory.evictCollection( ( (CollectionType) types[i] ).getRole(), id );
}
else if ( types[i].isComponentType() ) {
AbstractComponentType actype = (AbstractComponentType) types[i];
evictCachedCollections( actype.getSubtypes(), id, factory );
}
}
}
}
