org.hibernate.engine.internal

Class TwoPhaseLoad

java.lang.Object

org.hibernate.engine.internal.TwoPhaseLoad

public final class TwoPhaseLoad
extends Object

Functionality relating to the Hibernate two-phase loading process, that may be reused by persisters that do not use the Loader framework

Author:

Gavin King

Method Summary

Modifier and Type	Method and Description
static void	addUninitializedCachedEntity(EntityKey key, Object object, EntityPersister persister, LockMode lockMode, Object version, SessionImplementor session) Same as addUninitializedEntity(org.hibernate.engine.spi.EntityKey, java.lang.Object, org.hibernate.persister.entity.EntityPersister, org.hibernate.LockMode, org.hibernate.engine.spi.SessionImplementor), but here for an entity from the second level cache
static void	addUninitializedEntity(EntityKey key, Object object, EntityPersister persister, LockMode lockMode, SessionImplementor session) Add an uninitialized instance of an entity class, as a placeholder to ensure object identity.
static void	initializeEntity(Object entity, boolean readOnly, SessionImplementor session, PreLoadEvent preLoadEvent) Perform the second step of 2-phase load.
static void	postHydrate(EntityPersister persister, Serializable id, Object[] values, Object rowId, Object object, LockMode lockMode, SessionImplementor session) Register the "hydrated" state of an entity instance, after the first step of 2-phase loading.
static void	postLoad(Object entity, SessionImplementor session, PostLoadEvent postLoadEvent) PostLoad cannot occur during initializeEntity, as that call occurs *before* the Set collections are added to the persistence context by Loader.

Methods inherited from class java.lang.Object

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

Method Detail

postHydrate

public static void postHydrate(EntityPersister persister,
                               Serializable id,
                               Object[] values,
                               Object rowId,
                               Object object,
                               LockMode lockMode,
                               SessionImplementor session)

Register the "hydrated" state of an entity instance, after the first step of 2-phase loading. Add the "hydrated state" (an array) of an uninitialized entity to the session. We don't try to resolve any associations yet, because there might be other entities waiting to be read from the JDBC result set we are currently processing

Parameters:

persister - The persister for the hydrated entity

id - The entity identifier

values - The entity values

rowId - The rowId for the entity

object - An optional instance for the entity being loaded

lockMode - The lock mode

session - The Session

initializeEntity

public static void initializeEntity(Object entity,
                                    boolean readOnly,
                                    SessionImplementor session,
                                    PreLoadEvent preLoadEvent)

Perform the second step of 2-phase load. Fully initialize the entity instance.

After processing a JDBC result set, we "resolve" all the associations between the entities which were instantiated and had their state "hydrated" into an array

Parameters:

entity - The entity being loaded

readOnly - Is the entity being loaded as read-only

session - The Session

preLoadEvent - The (re-used) pre-load event

postLoad

public static void postLoad(Object entity,
                            SessionImplementor session,
                            PostLoadEvent postLoadEvent)

PostLoad cannot occur during initializeEntity, as that call occurs *before* the Set collections are added to the persistence context by Loader. Without the split, LazyInitializationExceptions can occur in the Entity's postLoad if it acts upon the collection. HHH-6043

Parameters:

entity - The entity

session - The Session

postLoadEvent - The (re-used) post-load event

addUninitializedEntity

public static void addUninitializedEntity(EntityKey key,
                                          Object object,
                                          EntityPersister persister,
                                          LockMode lockMode,
                                          SessionImplementor session)

Add an uninitialized instance of an entity class, as a placeholder to ensure object identity. Must be called before postHydrate(). Create a "temporary" entry for a newly instantiated entity. The entity is uninitialized, but we need the mapping from id to instance in order to guarantee uniqueness.

Parameters:

key - The entity key

object - The entity instance

persister - The entity persister

lockMode - The lock mode

session - The Session

addUninitializedCachedEntity

public static void addUninitializedCachedEntity(EntityKey key,
                                                Object object,
                                                EntityPersister persister,
                                                LockMode lockMode,
                                                Object version,
                                                SessionImplementor session)

Same as addUninitializedEntity(org.hibernate.engine.spi.EntityKey, java.lang.Object, org.hibernate.persister.entity.EntityPersister, org.hibernate.LockMode, org.hibernate.engine.spi.SessionImplementor), but here for an entity from the second level cache

Parameters:

key - The entity key

object - The entity instance

persister - The entity persister

lockMode - The lock mode

version - The version

session - The Session