public class

ScopedProxyFactoryBean

extends ProxyConfig
implements BeanFactoryAware FactoryBean<T>
java.lang.Object
   ↳ org.springframework.aop.framework.ProxyConfig
     ↳ org.springframework.aop.scope.ScopedProxyFactoryBean

Class Overview

Convenient proxy factory bean for scoped objects.

Proxies created using this factory bean are thread-safe singletons and may be injected into shared objects, with transparent scoping behavior.

Proxies returned by this class implement the ScopedObject interface. This presently allows for removing the corresponding object from the scope, seamlessly creating a new instance in the scope on next access.

Please note that the proxies created by this factory are class-based proxies by default. This can be customized through switching the "proxyTargetClass" property to "false".

Summary

Public Constructors
ScopedProxyFactoryBean()
Create a new ScopedProxyFactoryBean instance.
Public Methods
Object getObject()
Return an instance (possibly shared or independent) of the object managed by this factory.
Class<?> getObjectType()
Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean isSingleton()
Is the object managed by this factory a singleton? That is, will 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.

void setBeanFactory(BeanFactory beanFactory)
Callback that supplies the owning factory to a bean instance.
void setTargetBeanName(String targetBeanName)
Set the name of the bean that is to be scoped.
[Expand]
Inherited Methods
From class org.springframework.aop.framework.ProxyConfig
From class java.lang.Object
From interface org.springframework.beans.factory.BeanFactoryAware
From interface org.springframework.beans.factory.FactoryBean

Public Constructors

public ScopedProxyFactoryBean ()

Create a new ScopedProxyFactoryBean instance.

Public Methods

public Object getObject ()

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.

Returns
  • an instance of the bean (can be null)

public Class<?> getObjectType ()

Return the type of object that this FactoryBean creates, or 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.

Returns
  • the type of object that this FactoryBean creates, or null if not known at the time of the call

public boolean isSingleton ()

Is the object managed by this factory a singleton? That is, will 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 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.

Returns
  • whether the exposed object is a singleton

public void setBeanFactory (BeanFactory beanFactory)

Callback that supplies the owning factory to a bean instance.

Invoked after the population of normal bean properties but before an initialization callback such as afterPropertiesSet() or a custom init-method.

Parameters
beanFactory owning BeanFactory (never null). The bean can immediately call methods on the factory.

public void setTargetBeanName (String targetBeanName)

Set the name of the bean that is to be scoped.