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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.orm.jdo 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.springframework.orm.jdo.TransactionAwarePersistenceManagerFactoryProxy

TransactionAwarePersistenceManagerFactoryProxy
public class TransactionAwarePersistenceManagerFactoryProxy implements FactoryBean(Code)
Proxy for a target JDO javax.jdo.PersistenceManagerFactory , returning the current thread-bound PersistenceManager (the Spring-managed transactional PersistenceManager or a the single OpenPersistenceManagerInView PersistenceManager) on getPersistenceManager(), if any.

Essentially, getPersistenceManager() calls get seamlessly forwarded to PersistenceManagerFactoryUtils.getPersistenceManager . Furthermore, PersistenceManager.close calls get forwarded to PersistenceManagerFactoryUtils.releasePersistenceManager .

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!

It is usually preferable to write your JDO-based DAOs with Spring's JdoTemplate , offering benefits such as consistent data access exceptions instead of JDOExceptions at the DAO layer. However, Spring's resource and transaction management (and Dependency Injection) will work for DAOs written against the plain JDO API as well.

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.
author:
   Juergen Hoeller
since:
   1.2
See Also:   javax.jdo.PersistenceManagerFactory.getPersistenceManager
See Also:   javax.jdo.PersistenceManager.close
See Also:   PersistenceManagerFactoryUtils.getPersistenceManager
See Also:   PersistenceManagerFactoryUtils.releasePersistenceManager





Method Summary
public  ObjectgetObject()
    
public  ClassgetObjectType()
    
public  PersistenceManagerFactorygetTargetPersistenceManagerFactory()
     Return the target JDO PersistenceManagerFactory that this proxy delegates to.
protected  booleanisAllowCreate()
     Return whether the PersistenceManagerFactory proxy is allowed to create a non-transactional PersistenceManager when no transactional PersistenceManager can be found for the current thread.
public  booleanisSingleton()
    
public  voidsetAllowCreate(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".

public  voidsetTargetPersistenceManagerFactory(PersistenceManagerFactory target)
     Set the target JDO PersistenceManagerFactory that this proxy should delegate to.



Method Detail
getObject
public Object getObject()(Code)



getObjectType
public Class getObjectType()(Code)



getTargetPersistenceManagerFactory
public PersistenceManagerFactory getTargetPersistenceManagerFactory()(Code)
Return the target JDO PersistenceManagerFactory that this proxy delegates to.



isAllowCreate
protected boolean isAllowCreate()(Code)
Return whether the PersistenceManagerFactory proxy is allowed to create a non-transactional PersistenceManager when no transactional PersistenceManager can be found for the current thread.



isSingleton
public boolean isSingleton()(Code)



setAllowCreate
public void setAllowCreate(boolean allowCreate)(Code)
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 corresponding PersistenceManager.close() call).
See Also:   PersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactoryboolean)




setTargetPersistenceManagerFactory
public void setTargetPersistenceManagerFactory(PersistenceManagerFactory target)(Code)
Set the target JDO PersistenceManagerFactory that this proxy should delegate to. This should be the raw PersistenceManagerFactory, as accessed by JdoTransactionManager.
See Also:   org.springframework.orm.jdo.JdoTransactionManager



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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