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DefaultDeleteEventListener (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.event.def
Class DefaultDeleteEventListener

java.lang.Object
  org.hibernate.event.def.DefaultDeleteEventListener

All Implemented Interfaces:

DeleteEventListener, Serializable

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public class DefaultDeleteEventListener

extends Object

implements DeleteEventListener

Defines the default delete event listener used by hibernate for deleting entities from the datastore in response to generated delete events.

Author:

Steve Ebersole

See Also:

Serialized Form

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Constructor Summary

DefaultDeleteEventListener()

 

Method Summary
protected  void	cascadeAfterDelete(EventSource session, EntityPersister persister, Object entity, Set transientEntities)
protected  void	cascadeBeforeDelete(EventSource session, EntityPersister persister, Object entity, EntityEntry entityEntry, Set transientEntities)
protected  void	deleteEntity(EventSource session, Object entity, EntityEntry entityEntry, boolean isCascadeDeleteEnabled, EntityPersister persister, Set transientEntities)           Perform the entity deletion.
protected  void	deleteTransientEntity(EventSource session, Object entity, boolean cascadeDeleteEnabled, EntityPersister persister, Set transientEntities)           We encountered a delete request on a transient instance.
protected  boolean	invokeDeleteLifecycle(EventSource session, Object entity, EntityPersister persister)
void	onDelete(DeleteEvent event)           Handle the given delete event.
void	onDelete(DeleteEvent event, Set transientEntities)           Handle the given delete event.
protected  void	performDetachedEntityDeletionCheck(DeleteEvent event)           Called when we have recognized an attempt to delete a detached entity.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

DefaultDeleteEventListener

public DefaultDeleteEventListener()

Method Detail

onDelete

public void onDelete(DeleteEvent event)
              throws HibernateException

Handle the given delete event.

Specified by:

onDelete in interface DeleteEventListener

Parameters:

event - The delete event to be handled.

Throws:

HibernateException

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onDelete

public void onDelete(DeleteEvent event,
                     Set transientEntities)
              throws HibernateException

Handle the given delete event. This is the cascaded form.

Specified by:

onDelete in interface DeleteEventListener

Parameters:

event - The delete event.

transientEntities - The cache of entities already deleted

Throws:

HibernateException

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performDetachedEntityDeletionCheck

protected void performDetachedEntityDeletionCheck(DeleteEvent event)

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.

Parameters:

event - The event.

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deleteTransientEntity

protected void deleteTransientEntity(EventSource session,
                                     Object entity,
                                     boolean cascadeDeleteEnabled,
                                     EntityPersister persister,
                                     Set transientEntities)

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.

Parameters:

session - The session which is the source of the event

entity - The entity being delete processed

cascadeDeleteEnabled - Is cascading of deletes enabled

persister - The entity persister

transientEntities - A cache of already visited transient entities (to avoid infinite recursion).

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deleteEntity

protected final void deleteEntity(EventSource session,
                                  Object entity,
                                  EntityEntry entityEntry,
                                  boolean isCascadeDeleteEnabled,
                                  EntityPersister persister,
                                  Set transientEntities)

Perform the entity deletion. Well, as with most operations, does not really perform it; just schedules an action/execution with the ActionQueue for execution during flush.

Parameters:

session - The originating session

entity - The entity to delete

entityEntry - The entity's entry in the PersistenceContext

isCascadeDeleteEnabled - Is delete cascading enabled?

persister - The entity persister.

transientEntities - A cache of already deleted entities.

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invokeDeleteLifecycle

protected boolean invokeDeleteLifecycle(EventSource session,
                                        Object entity,
                                        EntityPersister persister)

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cascadeBeforeDelete

protected void cascadeBeforeDelete(EventSource session,
                                   EntityPersister persister,
                                   Object entity,
                                   EntityEntry entityEntry,
                                   Set transientEntities)
                            throws HibernateException

Throws:

HibernateException

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cascadeAfterDelete

protected void cascadeAfterDelete(EventSource session,
                                  EntityPersister persister,
                                  Object entity,
                                  Set transientEntities)
                           throws HibernateException

Throws:

HibernateException

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