类 TransactionAwarePersistenceManagerFactoryProxy
- java.lang.Object
- org.springframework.orm.jdo.TransactionAwarePersistenceManagerFactoryProxy
- 所有已实现的接口:
FactoryBean<javax.jdo.PersistenceManagerFactory>
public class TransactionAwarePersistenceManagerFactoryProxy extends Object implements FactoryBean<javax.jdo.PersistenceManagerFactory>
Proxy for a target JDOPersistenceManagerFactory
, returning the current thread-bound PersistenceManager (the Spring-managed transactional PersistenceManager or the single OpenPersistenceManagerInView PersistenceManager) ongetPersistenceManager()
, if any.Essentially,
getPersistenceManager()
calls get seamlessly forwarded toPersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactory, boolean)
. Furthermore,PersistenceManager.close
calls get forwarded toPersistenceManagerFactoryUtils.releasePersistenceManager(javax.jdo.PersistenceManager, javax.jdo.PersistenceManagerFactory)
.The main advantage of this proxy is that it allows DAOs to work with a plain JDO PersistenceManagerFactory reference, while still participating in Spring's (or a J2EE server's) resource and transaction management. DAOs will only rely on the JDO API in such a scenario, without any Spring dependencies.
Note that the behavior of this proxy matches the behavior that the JDO spec defines for a PersistenceManagerFactory as exposed by a JCA connector, when deployed in a J2EE server. Hence, DAOs could seamlessly switch between a JNDI PersistenceManagerFactory and this proxy for a local PersistenceManagerFactory, receiving the reference through Dependency Injection. This will work without any Spring API dependencies in the DAO code!
Of course, you can still access the target PersistenceManagerFactory even when your DAOs go through this proxy, by defining a bean reference that points directly at your target PersistenceManagerFactory bean.
- 从以下版本开始:
- 1.2
- 作者:
- Juergen Hoeller
- 另请参阅:
PersistenceManagerFactory.getPersistenceManager()
,PersistenceManager.close()
,PersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactory, boolean)
,PersistenceManagerFactoryUtils.releasePersistenceManager(javax.jdo.PersistenceManager, javax.jdo.PersistenceManagerFactory)
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 javax.jdo.PersistenceManagerFactory
getObject()
Return an instance (possibly shared or independent) of the object managed by this factory.Class<? extends javax.jdo.PersistenceManagerFactory>
getObjectType()
Return the type of object that this FactoryBean creates, ornull
if not known in advance.javax.jdo.PersistenceManagerFactory
getTargetPersistenceManagerFactory()
Return the target JDO PersistenceManagerFactory that this proxy delegates to.protected boolean
isAllowCreate()
Return whether the PersistenceManagerFactory proxy is allowed to create a non-transactional PersistenceManager when no transactional PersistenceManager can be found for the current thread.boolean
isSingleton()
Is the object managed by this factory a singleton?void
setAllowCreate(boolean allowCreate)
Set whether the PersistenceManagerFactory proxy is allowed to create a non-transactional PersistenceManager when no transactional PersistenceManager can be found for the current thread.void
setTargetPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory target)
Set the target JDO PersistenceManagerFactory that this proxy should delegate to.
构造器详细资料
TransactionAwarePersistenceManagerFactoryProxy
public TransactionAwarePersistenceManagerFactoryProxy()
方法详细资料
setTargetPersistenceManagerFactory
public void setTargetPersistenceManagerFactory(javax.jdo.PersistenceManagerFactory target)
Set the target JDO PersistenceManagerFactory that this proxy should delegate to. This should be the raw PersistenceManagerFactory, as accessed by JdoTransactionManager.
getTargetPersistenceManagerFactory
public javax.jdo.PersistenceManagerFactory getTargetPersistenceManagerFactory()
Return the target JDO PersistenceManagerFactory that this proxy delegates to.
setAllowCreate
public void setAllowCreate(boolean allowCreate)
Set whether the PersistenceManagerFactory proxy is allowed to create a non-transactional PersistenceManager when no transactional PersistenceManager can be found for the current thread.Default is "true". Can be turned off to enforce access to transactional PersistenceManagers, which safely allows for DAOs written to get a PersistenceManager without explicit closing (i.e. a
PersistenceManagerFactory.getPersistenceManager()
call without correspondingPersistenceManager.close()
call).
isAllowCreate
protected boolean isAllowCreate()
Return whether the PersistenceManagerFactory proxy is allowed to create a non-transactional PersistenceManager when no transactional PersistenceManager can be found for the current thread.
getObject
public javax.jdo.PersistenceManagerFactory 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<javax.jdo.PersistenceManagerFactory>
- 返回:
- an instance of the bean (can be
null
) - 另请参阅:
FactoryBeanNotInitializedException
getObjectType
public Class<? extends javax.jdo.PersistenceManagerFactory> 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<javax.jdo.PersistenceManagerFactory>
- 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<javax.jdo.PersistenceManagerFactory>
- 返回:
- whether the exposed object is a singleton
- 另请参阅:
FactoryBean.getObject()
,SmartFactoryBean.isPrototype()