Package javax.persistence
Interface EntityManagerFactory
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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
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
close()
Close the factory, releasing any resources that it holds.EntityManager
createEntityManager()
Create a new application-managedEntityManager
.EntityManager
createEntityManager(Map map)
Create a new application-managedEntityManager
with the specified Map of properties.Cache
getCache()
Access the cache that is associated with the entity manager factory (the "second level cache").CriteriaBuilder
getCriteriaBuilder()
Return an instance ofCriteriaBuilder
for the creation ofCriteriaQuery
objects.Metamodel
getMetamodel()
Return an instance ofMetamodel
interface for access to the metamodel of the persistence unit.PersistenceUnitUtil
getPersistenceUnitUtil()
Return interface providing access to utility methods for the persistence unit.Map<String,Object>
getProperties()
Get the properties and associated values that are in effect for the entity manager factory.boolean
isOpen()
Indicates whether the factory is open.
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Method Detail
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createEntityManager
EntityManager createEntityManager()
Create a new application-managedEntityManager
. This method returns a newEntityManager
instance each time it is invoked. TheisOpen
method will return true on the returned instance.- Returns:
- entity manager instance
- Throws:
IllegalStateException
- if the entity manager factory has been closed
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createEntityManager
EntityManager createEntityManager(Map map)
Create a new application-managedEntityManager
with the specified Map of properties. This method returns a newEntityManager
instance each time it is invoked. TheisOpen
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
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getCriteriaBuilder
CriteriaBuilder getCriteriaBuilder()
Return an instance ofCriteriaBuilder
for the creation ofCriteriaQuery
objects.- Returns:
- CriteriaBuilder instance
- Throws:
IllegalStateException
- if the entity manager factory has been closed- Since:
- Java Persistence 2.0
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getMetamodel
Metamodel getMetamodel()
Return an instance ofMetamodel
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
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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
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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 theIllegalStateException
, except forisOpen
, which will return false. Once anEntityManagerFactory
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
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getProperties
Map<String,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
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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
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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
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