org.exoplatform.commons.persistence.impl

Class GenericDAOJPAImpl<E,ID extends Serializable>

java.lang.Object

org.exoplatform.commons.persistence.impl.GenericDAOJPAImpl<E,ID>

Type Parameters:

E - Entity type

ID - Identity of the entity

All Implemented Interfaces:

org.exoplatform.commons.api.persistence.GenericDAO<E,ID>

public class GenericDAOJPAImpl<E,ID extends Serializable>
extends Object
implements org.exoplatform.commons.api.persistence.GenericDAO<E,ID>

Version:

$Revision$

Author:

Trong Tran

Field Summary

Fields

Modifier and Type	Field and Description
protected Class<E>	modelClass

Constructor Summary

Constructors

Constructor and Description
GenericDAOJPAImpl()

Method Summary

Methods

Modifier and Type	Method and Description
Long	count()
E	create(E entity)
void	createAll(List<E> entities)
void	delete(E entity)
void	deleteAll()
void	deleteAll(List<E> entities)
E	find(ID id)
List<E>	findAll() This method makes 2 calls to getEntityManager(): 1- The first one to get the CriteriaBuilder 2- The second one to create the query If there is no EntityManager in the threadLocal (i.e: EntityManagerService.getEntityManager() returns null), the EntityManagerHolder will return 2 distinct EntityManager instances.
protected javax.persistence.EntityManager	getEntityManager() Return an EntityManager instance.
E	update(E entity)
void	updateAll(List<E> entities)

Methods inherited from class java.lang.Object

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

Field Detail

modelClass

protected Class<E> modelClass

Constructor Detail

GenericDAOJPAImpl

public GenericDAOJPAImpl()

Method Detail

count

public Long count()

Specified by:

count in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

find

public E find(ID id)

Specified by:

find in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

findAll

public List<E> findAll()

This method makes 2 calls to getEntityManager(): 1- The first one to get the CriteriaBuilder 2- The second one to create the query If there is no EntityManager in the threadLocal (i.e: EntityManagerService.getEntityManager() returns null), the EntityManagerHolder will return 2 distinct EntityManager instances. This will result in a org.hibernate.SessionException: Session is closed!. Thus, this method shall always be invoked with an EntityManager in the ThreadLocal (for example, from a request managed by the portal lifecycle or from a method annotated with @ExoTransactional)

Specified by:

findAll in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

create

public E create(E entity)

Specified by:

create in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

createAll

public void createAll(List<E> entities)

Specified by:

createAll in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

update

public E update(E entity)

Specified by:

update in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

updateAll

public void updateAll(List<E> entities)

Specified by:

updateAll in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

delete

public void delete(E entity)

Specified by:

delete in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

deleteAll

public void deleteAll(List<E> entities)

Specified by:

deleteAll in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

deleteAll

public void deleteAll()

Specified by:

deleteAll in interface org.exoplatform.commons.api.persistence.GenericDAO<E,ID extends Serializable>

getEntityManager

protected javax.persistence.EntityManager getEntityManager()

Return an EntityManager instance.

Returns:

An EntityManger instance.