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/*
* 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.io.Serializable;
import java.util.Set;
import org.jboss.logging.Logger;
import org.hibernate.CacheMode;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.TransientObjectException;
import org.hibernate.action.internal.EntityDeleteAction;
import org.hibernate.classic.Lifecycle;
import org.hibernate.engine.internal.Cascade;
import org.hibernate.engine.internal.ForeignKeys;
import org.hibernate.engine.internal.Nullability;
import org.hibernate.engine.spi.CascadingAction;
import org.hibernate.engine.spi.EntityEntry;
import org.hibernate.engine.spi.EntityKey;
import org.hibernate.engine.spi.PersistenceContext;
import org.hibernate.engine.spi.Status;
import org.hibernate.event.spi.DeleteEvent;
import org.hibernate.event.spi.DeleteEventListener;
import org.hibernate.event.spi.EventSource;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.internal.util.collections.IdentitySet;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.type.Type;
import org.hibernate.type.TypeHelper;
/**
* Defines the default delete event listener used by hibernate for deleting entities
* from the datastore in response to generated delete events.
*
* @author Steve Ebersole
*/
public class DefaultDeleteEventListener implements DeleteEventListener {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class,
DefaultDeleteEventListener.class.getName());
/**
* Handle the given delete event.
*
* @param event The delete event to be handled.
*
* @throws HibernateException
*/
public void onDelete(DeleteEvent event) throws HibernateException {
onDelete( event, new IdentitySet() );
}
/**
* Handle the given delete event. This is the cascaded form.
*
* @param event The delete event.
* @param transientEntities The cache of entities already deleted
*
* @throws HibernateException
*/
public void onDelete(DeleteEvent event, Set transientEntities) throws HibernateException {
final EventSource source = event.getSession();
final PersistenceContext persistenceContext = source.getPersistenceContext();
Object entity = persistenceContext.unproxyAndReassociate( event.getObject() );
EntityEntry entityEntry = persistenceContext.getEntry( entity );
final EntityPersister persister;
final Serializable id;
final Object version;
if ( entityEntry == null ) {
LOG.trace( "Entity was not persistent in delete processing" );
persister = source.getEntityPersister( event.getEntityName(), entity );
if ( ForeignKeys.isTransient( persister.getEntityName(), entity, null, source ) ) {
deleteTransientEntity( source, entity, event.isCascadeDeleteEnabled(), persister, transientEntities );
// EARLY EXIT!!!
return;
}
performDetachedEntityDeletionCheck( event );
id = persister.getIdentifier( entity, source );
if ( id == null ) {
throw new TransientObjectException(
"the detached instance passed to delete() had a null identifier"
);
}
final EntityKey key = source.generateEntityKey( id, persister );
persistenceContext.checkUniqueness( key, entity );
new OnUpdateVisitor( source, id, entity ).process( entity, persister );
version = persister.getVersion( entity );
entityEntry = persistenceContext.addEntity(
entity,
( persister.isMutable() ? Status.MANAGED : Status.READ_ONLY ),
persister.getPropertyValues( entity ),
key,
version,
LockMode.NONE,
true,
persister,
false,
false
);
}
else {
LOG.trace( "Deleting a persistent instance" );
if ( entityEntry.getStatus() == Status.DELETED || entityEntry.getStatus() == Status.GONE ) {
LOG.trace( "Object was already deleted" );
return;
}
persister = entityEntry.getPersister();
id = entityEntry.getId();
version = entityEntry.getVersion();
}
/*if ( !persister.isMutable() ) {
throw new HibernateException(
"attempted to delete an object of immutable class: " +
MessageHelper.infoString(persister)
);
}*/
if ( invokeDeleteLifecycle( source, entity, persister ) ) {
return;
}
deleteEntity( source, entity, entityEntry, event.isCascadeDeleteEnabled(), persister, transientEntities );
if ( source.getFactory().getSettings().isIdentifierRollbackEnabled() ) {
persister.resetIdentifier( entity, id, version, source );
}
}
/**
* Called when we have recognized an attempt to delete a detached entity.
*
* This is perfectly valid in Hibernate usage; JPA, however, forbids this.
* Thus, this is a hook for HEM to affect this behavior.
*
* @param event The event.
*/
protected void performDetachedEntityDeletionCheck(DeleteEvent event) {
// ok in normal Hibernate usage to delete a detached entity; JPA however
// forbids it, thus this is a hook for HEM to affect this behavior
}
/**
* We encountered a delete request on a transient instance.
*
* This is a deviation from historical Hibernate (pre-3.2) behavior to
* align with the JPA spec, which states that transient entities can be
* passed to remove operation in which case cascades still need to be
* performed.
*
* @param session The session which is the source of the event
* @param entity The entity being delete processed
* @param cascadeDeleteEnabled Is cascading of deletes enabled
* @param persister The entity persister
* @param transientEntities A cache of already visited transient entities
* (to avoid infinite recursion).
*/
protected void deleteTransientEntity(
EventSource session,
Object entity,
boolean cascadeDeleteEnabled,
EntityPersister persister,
Set transientEntities) {
LOG.handlingTransientEntity();
if ( transientEntities.contains( entity ) ) {
LOG.trace( "Already handled transient entity; skipping" );
return;
}
transientEntities.add( entity );
cascadeBeforeDelete( session, persister, entity, null, transientEntities );
cascadeAfterDelete( session, persister, entity, transientEntities );
}
/**
* Perform the entity deletion. Well, as with most operations, does not
* really perform it; just schedules an action/execution with the
* {@link org.hibernate.engine.spi.ActionQueue} for execution during flush.
*
* @param session The originating session
* @param entity The entity to delete
* @param entityEntry The entity's entry in the {@link PersistenceContext}
* @param isCascadeDeleteEnabled Is delete cascading enabled?
* @param persister The entity persister.
* @param transientEntities A cache of already deleted entities.
*/
protected final void deleteEntity(
final EventSource session,
final Object entity,
final EntityEntry entityEntry,
final boolean isCascadeDeleteEnabled,
final EntityPersister persister,
final Set transientEntities) {
if ( LOG.isTraceEnabled() ) {
LOG.tracev( "Deleting {0}", MessageHelper.infoString( persister, entityEntry.getId(), session.getFactory() ) );
}
final PersistenceContext persistenceContext = session.getPersistenceContext();
final Type[] propTypes = persister.getPropertyTypes();
final Object version = entityEntry.getVersion();
final Object[] currentState;
if ( entityEntry.getLoadedState() == null ) { //ie. the entity came in from update()
currentState = persister.getPropertyValues( entity );
}
else {
currentState = entityEntry.getLoadedState();
}
final Object[] deletedState = createDeletedState( persister, currentState, session );
entityEntry.setDeletedState( deletedState );
session.getInterceptor().onDelete(
entity,
entityEntry.getId(),
deletedState,
persister.getPropertyNames(),
propTypes
);
// before any callbacks, etc, so subdeletions see that this deletion happened first
persistenceContext.setEntryStatus( entityEntry, Status.DELETED );
final EntityKey key = session.generateEntityKey( entityEntry.getId(), persister );
cascadeBeforeDelete( session, persister, entity, entityEntry, transientEntities );
new ForeignKeys.Nullifier( entity, true, false, session )
.nullifyTransientReferences( entityEntry.getDeletedState(), propTypes );
new Nullability( session ).checkNullability( entityEntry.getDeletedState(), persister, true );
persistenceContext.getNullifiableEntityKeys().add( key );
// Ensures that containing deletions happen before sub-deletions
session.getActionQueue().addAction(
new EntityDeleteAction(
entityEntry.getId(),
deletedState,
version,
entity,
persister,
isCascadeDeleteEnabled,
session
)
);
cascadeAfterDelete( session, persister, entity, transientEntities );
// the entry will be removed after the flush, and will no longer
// override the stale snapshot
// This is now handled by removeEntity() in EntityDeleteAction
//persistenceContext.removeDatabaseSnapshot(key);
}
private Object[] createDeletedState(EntityPersister persister, Object[] currentState, EventSource session) {
Type[] propTypes = persister.getPropertyTypes();
final Object[] deletedState = new Object[propTypes.length];
// TypeFactory.deepCopy( currentState, propTypes, persister.getPropertyUpdateability(), deletedState, session );
boolean[] copyability = new boolean[propTypes.length];
java.util.Arrays.fill( copyability, true );
TypeHelper.deepCopy( currentState, propTypes, copyability, deletedState, session );
return deletedState;
}
protected boolean invokeDeleteLifecycle(EventSource session, Object entity, EntityPersister persister) {
if ( persister.implementsLifecycle() ) {
LOG.debug( "Calling onDelete()" );
if ( ( ( Lifecycle ) entity ).onDelete( session ) ) {
LOG.debug( "Deletion vetoed by onDelete()" );
return true;
}
}
return false;
}
protected void cascadeBeforeDelete(
EventSource session,
EntityPersister persister,
Object entity,
EntityEntry entityEntry,
Set transientEntities) throws HibernateException {
CacheMode cacheMode = session.getCacheMode();
session.setCacheMode( CacheMode.GET );
session.getPersistenceContext().incrementCascadeLevel();
try {
// cascade-delete to collections BEFORE the collection owner is deleted
new Cascade( CascadingAction.DELETE, Cascade.AFTER_INSERT_BEFORE_DELETE, session )
.cascade( persister, entity, transientEntities );
}
finally {
session.getPersistenceContext().decrementCascadeLevel();
session.setCacheMode( cacheMode );
}
}
protected void cascadeAfterDelete(
EventSource session,
EntityPersister persister,
Object entity,
Set transientEntities) throws HibernateException {
CacheMode cacheMode = session.getCacheMode();
session.setCacheMode( CacheMode.GET );
session.getPersistenceContext().incrementCascadeLevel();
try {
// cascade-delete to many-to-one AFTER the parent was deleted
new Cascade( CascadingAction.DELETE, Cascade.BEFORE_INSERT_AFTER_DELETE, session )
.cascade( persister, entity, transientEntities );
}
finally {
session.getPersistenceContext().decrementCascadeLevel();
session.setCacheMode( cacheMode );
}
}
}
