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java.lang.Object org.springframework.orm.jdo.JdoAccessor org.springframework.orm.jdo.support.SpringPersistenceManagerProxyBean
public class SpringPersistenceManagerProxyBean
Proxy that implements the PersistenceManager
interface,
delegating to the current thread-bound PersistenceManager (the Spring-managed
transactional PersistenceManager or the single OpenPersistenceManagerInView
PersistenceManager, if any) on each invocation. This class makes such a
Spring-style PersistenceManager proxy available for bean references.
The main advantage of this proxy is that it allows DAOs to work with a
plain JDO PersistenceManager reference in JDO 2.1 style
(see PersistenceManagerFactory.getPersistenceManagerProxy()
),
while still participating in Spring's resource and transaction management.
The behavior of this proxy matches the behavior that the JDO 2.1 spec
defines for a PersistenceManager proxy. Hence, DAOs could seamlessly switch
between StandardPersistenceManagerProxyBean
and this Spring-style proxy,
receiving the reference through Dependency Injection. This will work without
any Spring API dependencies in the DAO code!
Note: In contrast to StandardPersistenceManagerProxyBean
, this proxy
works with JDO 2.0 and higher. It does not require JDO 2.1.
StandardPersistenceManagerProxyBean
,
PersistenceManagerFactory.getPersistenceManagerProxy()
,
PersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactory, boolean)
,
PersistenceManagerFactoryUtils.releasePersistenceManager(javax.jdo.PersistenceManager, javax.jdo.PersistenceManagerFactory)
Field Summary |
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Fields inherited from class org.springframework.orm.jdo.JdoAccessor |
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logger |
Constructor Summary | |
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SpringPersistenceManagerProxyBean()
|
Method Summary | |
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void |
afterPropertiesSet()
Eagerly initialize the JDO dialect, creating a default one for the specified PersistenceManagerFactory if none set. |
javax.jdo.PersistenceManager |
getObject()
Return an instance (possibly shared or independent) of the object managed by this factory. |
Class<? extends javax.jdo.PersistenceManager> |
getObjectType()
Return the type of object that this FactoryBean creates, or null if not known in advance. |
protected Class<? extends javax.jdo.PersistenceManager> |
getPersistenceManagerInterface()
Return the PersistenceManager interface to expose. |
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? That is, will FactoryBean.getObject() always return the same object
(a reference that can be cached)? |
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 |
setPersistenceManagerInterface(Class<? extends javax.jdo.PersistenceManager> persistenceManagerInterface)
Specify the PersistenceManager interface to expose, possibly including vendor extensions. |
Methods inherited from class org.springframework.orm.jdo.JdoAccessor |
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convertJdoAccessException, flushIfNecessary, getJdoDialect, getPersistenceManagerFactory, isFlushEager, setFlushEager, setJdoDialect, setPersistenceManagerFactory |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SpringPersistenceManagerProxyBean()
Method Detail |
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public void setPersistenceManagerInterface(Class<? extends javax.jdo.PersistenceManager> persistenceManagerInterface)
Default is the standard javax.jdo.PersistenceManager
interface.
protected Class<? extends javax.jdo.PersistenceManager> getPersistenceManagerInterface()
public void setAllowCreate(boolean allowCreate)
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).
PersistenceManagerFactoryUtils.getPersistenceManager(javax.jdo.PersistenceManagerFactory, boolean)
protected boolean isAllowCreate()
public void afterPropertiesSet()
JdoAccessor
afterPropertiesSet
in interface InitializingBean
afterPropertiesSet
in class JdoAccessor
public javax.jdo.PersistenceManager getObject()
FactoryBean
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.
getObject
in interface FactoryBean<javax.jdo.PersistenceManager>
null
)FactoryBeanNotInitializedException
public Class<? extends javax.jdo.PersistenceManager> getObjectType()
FactoryBean
null
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.
getObjectType
in interface FactoryBean<javax.jdo.PersistenceManager>
null
if not known at the time of the callListableBeanFactory.getBeansOfType(java.lang.Class)
public boolean isSingleton()
FactoryBean
FactoryBean.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 return true
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 extended SmartFactoryBean
interface
may explicitly indicate independent instances through its
SmartFactoryBean.isPrototype()
method. Plain FactoryBean
implementations which do not implement this extended interface are
simply assumed to always return independent instances if the
isSingleton()
implementation returns false
.
isSingleton
in interface FactoryBean<javax.jdo.PersistenceManager>
FactoryBean.getObject()
,
SmartFactoryBean.isPrototype()
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