类 SharedEntityManagerBean
- java.lang.Object
- org.springframework.orm.jpa.EntityManagerFactoryAccessor
- org.springframework.orm.jpa.support.SharedEntityManagerBean
- 所有已实现的接口:
Aware
,BeanFactoryAware
,FactoryBean<EntityManager>
,InitializingBean
public class SharedEntityManagerBean extends EntityManagerFactoryAccessor implements FactoryBean<EntityManager>, InitializingBean
FactoryBean
that exposes a shared JPAEntityManager
reference for a given EntityManagerFactory. Typically used for an EntityManagerFactory created byLocalContainerEntityManagerFactoryBean
, as direct alternative to a JNDI lookup for a Java EE server's EntityManager reference.The shared EntityManager will behave just like an EntityManager fetched from an application server's JNDI environment, as defined by the JPA specification. It will delegate all calls to the current transactional EntityManager, if any; otherwise, it will fall back to a newly created EntityManager per operation.
Can be passed to DAOs that expect a shared EntityManager reference rather than an EntityManagerFactory. Note that Spring's
JpaTransactionManager
always needs an EntityManagerFactory in order to create new transactional EntityManager instances.
字段概要
从类继承的字段 org.springframework.orm.jpa.EntityManagerFactoryAccessor
logger
构造器概要
构造器 构造器 说明 SharedEntityManagerBean()
方法概要
所有方法 实例方法 具体方法 修饰符和类型 方法 说明 void
afterPropertiesSet()
Invoked by the containingBeanFactory
after it has set all bean properties and satisfiedBeanFactoryAware
,ApplicationContextAware
etc.EntityManager
getObject()
Return an instance (possibly shared or independent) of the object managed by this factory.Class<? extends EntityManager>
getObjectType()
Return the type of object that this FactoryBean creates, ornull
if not known in advance.boolean
isSingleton()
Is the object managed by this factory a singleton?void
setEntityManagerInterface(Class<? extends EntityManager> entityManagerInterface)
Specify the EntityManager interface to expose.void
setSynchronizedWithTransaction(boolean synchronizedWithTransaction)
Set whether to automatically join ongoing transactions (according to the JPA 2.1 SynchronizationType rules).
构造器详细资料
SharedEntityManagerBean
public SharedEntityManagerBean()
方法详细资料
setEntityManagerInterface
public void setEntityManagerInterface(Class<? extends EntityManager> entityManagerInterface)
Specify the EntityManager interface to expose.Default is the EntityManager interface as defined by the EntityManagerFactoryInfo, if available. Else, the standard
javax.persistence.EntityManager
interface will be used.
setSynchronizedWithTransaction
public void setSynchronizedWithTransaction(boolean synchronizedWithTransaction)
Set whether to automatically join ongoing transactions (according to the JPA 2.1 SynchronizationType rules). Default is "true".
afterPropertiesSet
public final void afterPropertiesSet()
从接口复制的说明:InitializingBean
Invoked by the containingBeanFactory
after it has set all bean properties and satisfiedBeanFactoryAware
,ApplicationContextAware
etc.This method allows the bean instance to perform validation of its overall configuration and final initialization when all bean properties have been set.
- 指定者:
afterPropertiesSet
在接口中InitializingBean
getObject
public EntityManager getObject()
从接口复制的说明:FactoryBean
Return an instance (possibly shared or independent) of the object managed by this factory.As with a
BeanFactory
, this allows support for both the Singleton and Prototype design pattern.If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding
FactoryBeanNotInitializedException
.As of Spring 2.0, FactoryBeans are allowed to return
null
objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.- 指定者:
getObject
在接口中FactoryBean<EntityManager>
- 返回:
- an instance of the bean (can be
null
) - 另请参阅:
FactoryBeanNotInitializedException
getObjectType
public Class<? extends EntityManager> getObjectType()
从接口复制的说明:FactoryBean
Return the type of object that this FactoryBean creates, ornull
if not known in advance.This allows one to check for specific types of beans without instantiating objects, for example on autowiring.
In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.
This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.
NOTE: Autowiring will simply ignore FactoryBeans that return
null
here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.- 指定者:
getObjectType
在接口中FactoryBean<EntityManager>
- 返回:
- the type of object that this FactoryBean creates, or
null
if not known at the time of the call - 另请参阅:
ListableBeanFactory.getBeansOfType(java.lang.Class<T>)
isSingleton
public boolean isSingleton()
从接口复制的说明:FactoryBean
Is the object managed by this factory a singleton? That is, willFactoryBean.getObject()
always return the same object (a reference that can be cached)?NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from
getObject()
might get cached by the owning BeanFactory. Hence, do not returntrue
unless the FactoryBean always exposes the same reference.The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.
NOTE: This method returning
false
does not necessarily indicate that returned objects are independent instances. An implementation of the extendedSmartFactoryBean
interface may explicitly indicate independent instances through itsSmartFactoryBean.isPrototype()
method. PlainFactoryBean
implementations which do not implement this extended interface are simply assumed to always return independent instances if theisSingleton()
implementation returnsfalse
.- 指定者:
isSingleton
在接口中FactoryBean<EntityManager>
- 返回:
- whether the exposed object is a singleton
- 另请参阅:
FactoryBean.getObject()
,SmartFactoryBean.isPrototype()