nl.knowledgeplaza.util.jpa
Class EntityManagerExtender

java.lang.Object
  nl.knowledgeplaza.util.jpa.EntityManagerExtender

All Implemented Interfaces:

java.lang.reflect.InvocationHandler

Direct Known Subclasses:

EclipselinkEntityManagerExtender

public class EntityManagerExtender
extends java.lang.Object
implements java.lang.reflect.InvocationHandler

The disconnected usage of the EM requires that prior to storing or removing the toplevel entity a clear must be called, then the toplevel entity is stored/removed and is propogated down. In order to propogate down, any entity must be reachable. This works fine for storing, however removed entities are not reachable anymore and the clear has cleared the EM's list of removed entities. Because of this, removed subentities are in fact not removed, but where cleared by the clear call. To work around this, this wrapper was created: 1. keep a separate administration of removed enitit

Author:

toeu

Field Summary

static java.lang.Object	CLEARED_ENTITIES
static java.lang.String	SOURCECODE_VERSION Standard variable for determining version of a class file.

Constructor Summary

protected

EntityManagerExtender(javax.persistence.EntityManager em)

Method Summary

void	clearAllRemovedEntities()
void	clearDelayedMerges()
void	clearDelayedPersists()
void	clearRemovedEntities()
static void	executeNextClearWithoutClearingRemovedEntities(javax.persistence.EntityManager entityManager)
java.util.List	getAllRemovedEntities() AllRemovedEntities: the EM will erase its removed entities upon a "clear"
java.util.List	getDelayedMerges() DelayedMerges
java.util.List	getDelayedPersists() DelayedPersists
javax.persistence.EntityManager	getEntityManager() EntityManager
java.util.List	getRemovedEntities() RemovedEntities: the entities that are also remember by the wrapped EM
java.lang.Object	invoke(java.lang.Object proxy, java.lang.reflect.Method method, java.lang.Object[] args)
static javax.persistence.EntityManager	wrap(javax.persistence.EntityManager em)

Methods inherited from class java.lang.Object

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

Field Detail

SOURCECODE_VERSION

public static final java.lang.String SOURCECODE_VERSION

Standard variable for determining version of a class file.

See Also:

Constant Field Values

CLEARED_ENTITIES

public static final java.lang.Object CLEARED_ENTITIES

Constructor Detail

EntityManagerExtender

protected EntityManagerExtender(javax.persistence.EntityManager em)

Method Detail

getEntityManager

public javax.persistence.EntityManager getEntityManager()

EntityManager

getAllRemovedEntities

public java.util.List getAllRemovedEntities()

AllRemovedEntities: the EM will erase its removed entities upon a "clear"

clearAllRemovedEntities

public void clearAllRemovedEntities()

getRemovedEntities

public java.util.List getRemovedEntities()

RemovedEntities: the entities that are also remember by the wrapped EM

clearRemovedEntities

public void clearRemovedEntities()

getDelayedMerges

public java.util.List getDelayedMerges()

DelayedMerges

clearDelayedMerges

public void clearDelayedMerges()

getDelayedPersists

public java.util.List getDelayedPersists()

DelayedPersists

clearDelayedPersists

public void clearDelayedPersists()

invoke

public java.lang.Object invoke(java.lang.Object proxy,
                               java.lang.reflect.Method method,
                               java.lang.Object[] args)
                        throws java.lang.Throwable

Specified by:

invoke in interface java.lang.reflect.InvocationHandler

Throws:

java.lang.Throwable

wrap

public static javax.persistence.EntityManager wrap(javax.persistence.EntityManager em)

executeNextClearWithoutClearingRemovedEntities

public static void executeNextClearWithoutClearingRemovedEntities(javax.persistence.EntityManager entityManager)