org.springframework.aop.target
Class LazyInitTargetSource

java.lang.Object
  org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource
      org.springframework.aop.target.LazyInitTargetSource

All Implemented Interfaces:

Serializable, TargetSource, BeanFactoryAware

public class LazyInitTargetSource
extends AbstractBeanFactoryBasedTargetSource

TargetSource that lazily accesses a singleton from a BeanFactory.

Useful when a proxy reference is needed on initialization but the actual target object should not be initialized until first use. The target bean must me marked as "lazy-init" too, else it would get instantiated by the BeanFactory on startup. For example:

 <bean id="serviceTarget" class="example.MyService" lazy-init="true">
   ...
 </bean>

 <bean id="service" class="org.springframework.aop.framework.ProxyFactoryBean">
   <property name="targetSource">
     <bean class="org.springframework.aop.target.LazyInitTargetSource">
       <property name="targetBeanName" ref="serviceTarget"/>
     </bean>
   </property>
 </bean>

The "serviceTarget" bean will not get initialized until a method on the "service" proxy gets invoked.

NOTE: Consider specifying "targetClass" if you'd like to avoid any kind of access to the target bean (for example, to avoid initialization of a FactoryBean instance). Default is to detect the type automatically, through a getType call on the BeanFactory, which will trigger FactoryBeans.

Subclasses can extend this class and override the postProcessTargetObject(Object) to perform some additional processing with the target object when it is first loaded.

Since:

1.1.4

Author:

Juergen Hoeller, Rob Harrop

See Also:

AbstractBeanFactoryBasedTargetSource.setTargetClass(java.lang.Class), postProcessTargetObject(java.lang.Object), Serialized Form

Field Summary

Fields inherited from class org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource

logger

Constructor Summary

LazyInitTargetSource()

Method Summary

Object	getTarget() Return a target instance.
protected void	postProcessTargetObject(Object targetObject) Sub-classes may override this method to perform additional processing on the target object when it is first loaded.

Methods inherited from class org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource

copyFrom, getBeanFactory, getTargetBeanName, getTargetClass, isStatic, releaseTarget, setBeanFactory, setTargetBeanName, setTargetClass, writeReplace

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LazyInitTargetSource

public LazyInitTargetSource()

Method Detail

getTarget

public Object getTarget()
                 throws BeansException

Description copied from interface: TargetSource

Return a target instance. Invoked immediately before the AOP framework calls the "target" of an AOP method invocation.

Returns:

the target object, whicch contains the joinpoint

Throws:

BeansException

postProcessTargetObject

protected void postProcessTargetObject(Object targetObject)

Sub-classes may override this method to perform additional processing on the target object when it is first loaded.