org.hibernate

Interface CustomEntityDirtinessStrategy

All Known Implementing Classes:

DefaultCustomEntityDirtinessStrategy

public interface CustomEntityDirtinessStrategy

During a flush cycle, Hibernate needs to determine which of the entities associated with a Session. Dirty entities are the ones that get UPDATEed to the database.

In some circumstances, that process of determining whether an entity is dirty can take a significant time as by default Hibernate must check each of the entity's attribute values one-by-one. Oftentimes applications already have knowledge of an entity's dirtiness and using that information instead would be more performant. The purpose of this contract then is to allow applications such a plug-in point.

Author:

Steve Ebersole

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	CustomEntityDirtinessStrategy.AttributeChecker Responsible for identifying when attributes are dirty.
static interface	CustomEntityDirtinessStrategy.AttributeInformation Provides CustomEntityDirtinessStrategy.AttributeChecker with meta information about the attributes being checked.
static interface	CustomEntityDirtinessStrategy.DirtyCheckContext A callback to drive dirty checking.

Method Summary

Modifier and Type	Method and Description
boolean	canDirtyCheck(Object entity, EntityPersister persister, Session session) Is this strategy capable of telling whether the given entity is dirty? A return of true means that isDirty(java.lang.Object, org.hibernate.persister.entity.EntityPersister, org.hibernate.Session) will be called next as the definitive means to determine whether the entity is dirty.
void	findDirty(Object entity, EntityPersister persister, Session session, CustomEntityDirtinessStrategy.DirtyCheckContext dirtyCheckContext) Callback used to hook into Hibernate algorithm for determination of which attributes have changed.
boolean	isDirty(Object entity, EntityPersister persister, Session session) The callback used by Hibernate to determine if the given entity is dirty.
void	resetDirty(Object entity, EntityPersister persister, Session session) Callback used by Hibernate to signal that the entity dirty flag should be cleared.

Method Detail

canDirtyCheck

boolean canDirtyCheck(Object entity,
                      EntityPersister persister,
                      Session session)

Is this strategy capable of telling whether the given entity is dirty? A return of true means that isDirty(java.lang.Object, org.hibernate.persister.entity.EntityPersister, org.hibernate.Session) will be called next as the definitive means to determine whether the entity is dirty.

Parameters:

entity - The entity to be check.

persister - The persister corresponding to the given entity

session - The session from which this check originates.

Returns:

true indicates the dirty check can be done; false indicates it cannot.

isDirty

boolean isDirty(Object entity,
                EntityPersister persister,
                Session session)

The callback used by Hibernate to determine if the given entity is dirty. Only called if the previous canDirtyCheck(java.lang.Object, org.hibernate.persister.entity.EntityPersister, org.hibernate.Session) returned true

Parameters:

entity - The entity to check.

persister - The persister corresponding to the given entity

session - The session from which this check originates.

Returns:

true indicates the entity is dirty; false indicates the entity is not dirty.

resetDirty

void resetDirty(Object entity,
                EntityPersister persister,
                Session session)

Callback used by Hibernate to signal that the entity dirty flag should be cleared. Generally this happens after previous dirty changes were written to the database.

Parameters:

entity - The entity to reset

persister - The persister corresponding to the given entity

session - The session from which this call originates.

findDirty

void findDirty(Object entity,
               EntityPersister persister,
               Session session,
               CustomEntityDirtinessStrategy.DirtyCheckContext dirtyCheckContext)

Callback used to hook into Hibernate algorithm for determination of which attributes have changed. Applications wanting to hook in to this would call back into the given CustomEntityDirtinessStrategy.DirtyCheckContext.doDirtyChecking(org.hibernate.CustomEntityDirtinessStrategy.AttributeChecker) method passing along an appropriate CustomEntityDirtinessStrategy.AttributeChecker implementation.

Parameters:

entity - The entity being checked

persister - The persister corresponding to the given entity

session - The session from which this call originates.

dirtyCheckContext - The callback context