/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, 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.util.IdentityHashMap;
import java.util.Map;
import org.hibernate.HibernateException;
import org.hibernate.ObjectDeletedException;
import org.hibernate.PersistentObjectException;
import org.hibernate.engine.spi.CascadingAction;
import org.hibernate.engine.spi.CascadingActions;
import org.hibernate.engine.spi.EntityEntry;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.engine.spi.Status;
import org.hibernate.event.spi.EventSource;
import org.hibernate.event.spi.PersistEvent;
import org.hibernate.event.spi.PersistEventListener;
import org.hibernate.id.ForeignGenerator;
import org.hibernate.internal.CoreLogging;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.LazyInitializer;
/**
* Defines the default create event listener used by hibernate for creating
* transient entities in response to generated create events.
*
* @author Gavin King
*/
public class DefaultPersistEventListener extends AbstractSaveEventListener implements PersistEventListener {
private static final CoreMessageLogger LOG = CoreLogging.messageLogger( DefaultPersistEventListener.class );
@Override
protected CascadingAction getCascadeAction() {
return CascadingActions.PERSIST;
}
@Override
protected Boolean getAssumedUnsaved() {
return Boolean.TRUE;
}
/**
* Handle the given create event.
*
* @param event The create event to be handled.
*
* @throws HibernateException
*/
public void onPersist(PersistEvent event) throws HibernateException {
onPersist( event, new IdentityHashMap( 10 ) );
}
/**
* Handle the given create event.
*
* @param event The create event to be handled.
*
* @throws HibernateException
*/
public void onPersist(PersistEvent event, Map createCache) throws HibernateException {
final SessionImplementor source = event.getSession();
final Object object = event.getObject();
final Object entity;
if ( object instanceof HibernateProxy ) {
LazyInitializer li = ( (HibernateProxy) object ).getHibernateLazyInitializer();
if ( li.isUninitialized() ) {
if ( li.getSession() == source ) {
return; //NOTE EARLY EXIT!
}
else {
throw new PersistentObjectException( "uninitialized proxy passed to persist()" );
}
}
entity = li.getImplementation();
}
else {
entity = object;
}
final String entityName;
if ( event.getEntityName() != null ) {
entityName = event.getEntityName();
}
else {
entityName = source.bestGuessEntityName( entity );
event.setEntityName( entityName );
}
final EntityEntry entityEntry = source.getPersistenceContext().getEntry( entity );
EntityState entityState = getEntityState( entity, entityName, entityEntry, source );
if ( entityState == EntityState.DETACHED ) {
// JPA 2, in its version of a "foreign generated", allows the id attribute value
// to be manually set by the user, even though this manual value is irrelevant.
// The issue is that this causes problems with the Hibernate unsaved-value strategy
// which comes into play here in determining detached/transient state.
//
// Detect if we have this situation and if so null out the id value and calculate the
// entity state again.
// NOTE: entityEntry must be null to get here, so we cannot use any of its values
EntityPersister persister = source.getFactory().getEntityPersister( entityName );
if ( ForeignGenerator.class.isInstance( persister.getIdentifierGenerator() ) ) {
if ( LOG.isDebugEnabled() && persister.getIdentifier( entity, source ) != null ) {
LOG.debug( "Resetting entity id attribute to null for foreign generator" );
}
persister.setIdentifier( entity, null, source );
entityState = getEntityState( entity, entityName, entityEntry, source );
}
}
switch ( entityState ) {
case DETACHED: {
throw new PersistentObjectException(
"detached entity passed to persist: " +
getLoggableName( event.getEntityName(), entity )
);
}
case PERSISTENT: {
entityIsPersistent( event, createCache );
break;
}
case TRANSIENT: {
entityIsTransient( event, createCache );
break;
}
case DELETED: {
entityEntry.setStatus( Status.MANAGED );
entityEntry.setDeletedState( null );
event.getSession().getActionQueue().unScheduleDeletion( entityEntry, event.getObject() );
entityIsDeleted( event, createCache );
break;
}
default: {
throw new ObjectDeletedException(
"deleted entity passed to persist",
null,
getLoggableName( event.getEntityName(), entity )
);
}
}
}
@SuppressWarnings({"unchecked"})
protected void entityIsPersistent(PersistEvent event, Map createCache) {
LOG.trace( "Ignoring persistent instance" );
final EventSource source = event.getSession();
//TODO: check that entry.getIdentifier().equals(requestedId)
final Object entity = source.getPersistenceContext().unproxy( event.getObject() );
final EntityPersister persister = source.getEntityPersister( event.getEntityName(), entity );
if ( createCache.put( entity, entity ) == null ) {
justCascade( createCache, source, entity, persister );
}
}
private void justCascade(Map createCache, EventSource source, Object entity, EntityPersister persister) {
//TODO: merge into one method!
cascadeBeforeSave( source, persister, entity, createCache );
cascadeAfterSave( source, persister, entity, createCache );
}
/**
* Handle the given create event.
*
* @param event The save event to be handled.
* @param createCache The copy cache of entity instance to merge/copy instance.
*/
@SuppressWarnings({"unchecked"})
protected void entityIsTransient(PersistEvent event, Map createCache) {
LOG.trace( "Saving transient instance" );
final EventSource source = event.getSession();
final Object entity = source.getPersistenceContext().unproxy( event.getObject() );
if ( createCache.put( entity, entity ) == null ) {
saveWithGeneratedId( entity, event.getEntityName(), createCache, source, false );
}
}
@SuppressWarnings({"unchecked"})
private void entityIsDeleted(PersistEvent event, Map createCache) {
final EventSource source = event.getSession();
final Object entity = source.getPersistenceContext().unproxy( event.getObject() );
final EntityPersister persister = source.getEntityPersister( event.getEntityName(), entity );
LOG.tracef(
"un-scheduling entity deletion [%s]",
MessageHelper.infoString(
persister,
persister.getIdentifier( entity, source ),
source.getFactory()
)
);
if ( createCache.put( entity, entity ) == null ) {
justCascade( createCache, source, entity, persister );
}
}
}