Package org.springframework.aop.scope

Class ScopedProxyFactoryBean

java.lang.Object
org.springframework.aop.framework.ProxyConfig
org.springframework.aop.scope.ScopedProxyFactoryBean
All Implemented Interfaces:
Serializable, AopInfrastructureBean, Aware, BeanFactoryAware, FactoryBean<Object>
public class ScopedProxyFactoryBean extends ProxyConfig implements FactoryBean<Object>, BeanFactoryAware, AopInfrastructureBean
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".

Since:
2.0
Author:
Rod Johnson, Juergen Hoeller
See Also:

  • Constructor Details

    • ScopedProxyFactoryBean

      public ScopedProxyFactoryBean()
      Create a new ScopedProxyFactoryBean instance.

  • Method Details

    • setTargetBeanName

      public void setTargetBeanName(String targetBeanName)
      Set the name of the bean that is to be scoped.

    • setBeanFactory

      public void setBeanFactory(BeanFactory beanFactory)
      Description copied from interface: BeanFactoryAware
      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 InitializingBean.afterPropertiesSet() or a custom init-method.

      Specified by:
      setBeanFactory in interface BeanFactoryAware
      Parameters:
      beanFactory - owning BeanFactory (never null). The bean can immediately call methods on the factory.
      See Also:

    • getObject

      @Nullable public Object getObject()
      Description copied from interface: 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.

      Specified by:
      getObject in interface FactoryBean<Object>
      Returns:
      an instance of the bean (can be null)
      See Also:

    • getObjectType

      @Nullable public Class<?> getObjectType()
      Description copied from interface: FactoryBean
      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.

      Specified by:
      getObjectType in interface FactoryBean<Object>
      Returns:
      the type of object that this FactoryBean creates, or null if not known at the time of the call
      See Also:

    • isSingleton

      public boolean isSingleton()
      Description copied from interface: FactoryBean
      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)?

      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.

      The default implementation returns true, since a FactoryBean typically manages a singleton instance.

      Specified by:
      isSingleton in interface FactoryBean<Object>
      Returns:
      whether the exposed object is a singleton
      See Also: