javax.persistence
Interface EntityManagerFactory

public interface EntityManagerFactory

Interface used to interact with the entity manager factory for the persistence unit.

When the application has finished using the entity manager factory, and/or at application shutdown, the application should close the entity manager factory. Once an EntityManagerFactory has been closed, all its entity managers are considered to be in the closed state.

Since:

Java Persistence 1.0

createEntityManager

 EntityManager createEntityManager()

Create a new application-managed EntityManager. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance.

Returns:

entity manager instance

Throws:

IllegalStateException - if the entity manager factory has been closed

createEntityManager

 EntityManager createEntityManager(java.util.Map map)

Create a new application-managed EntityManager with the specified Map of properties. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance.

Parameters:

map - properties for entity manager

Returns:

entity manager instance

Throws:

IllegalStateException - if the entity manager factory has been closed

getCriteriaBuilder

 CriteriaBuilder getCriteriaBuilder()

Return an instance of CriteriaBuilder for the creation of CriteriaQuery objects.

Returns:

CriteriaBuilder instance

Throws:

IllegalStateException - if the entity manager factory has been closed

Since:

Java Persistence 2.0

getMetamodel

 Metamodel getMetamodel()

Return an instance of Metamodel interface for access to the metamodel of the persistence unit.

Returns:

Metamodel instance

Throws:

IllegalStateException - if the entity manager factory has been closed

Since:

Java Persistence 2.0

isOpen

 boolean isOpen()

Indicates whether the factory is open. Returns true until the factory has been closed.

Returns:

boolean indicating whether the factory is open

close

 void close()

Close the factory, releasing any resources that it holds. After a factory instance has been closed, all methods invoked on it will throw the IllegalStateException, except for isOpen, which will return false. Once an EntityManagerFactory has been closed, all its entity managers are considered to be in the closed state.

Throws:

IllegalStateException - if the entity manager factory has been closed

getProperties

 java.util.Map<java.lang.String,java.lang.Object> getProperties()

Get the properties and associated values that are in effect for the entity manager factory. Changing the contents of the map does not change the configuration in effect.

Returns:

properties

Throws:

IllegalStateException - if the entity manager factory has been closed

Since:

Java Persistence 2.0

getCache

 Cache getCache()

Access the cache that is associated with the entity manager factory (the "second level cache").

Returns:

instance of the Cache interface

Throws:

IllegalStateException - if the entity manager factory has been closed

Since:

Java Persistence 2.0

getPersistenceUnitUtil

 PersistenceUnitUtil getPersistenceUnitUtil()

Return interface providing access to utility methods for the persistence unit.

Returns:

PersistenceUnitUtil interface

Throws:

IllegalStateException - if the entity manager factory has been closed

Since:

Java Persistence 2.0

Generated on 10-February-2011 12:41