LazyInitTargetSource (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.aop.target
Class LazyInitTargetSource

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

All Implemented Interfaces:: Serializable, TargetClassAware, TargetSource, BeanFactoryAware

public class LazyInitTargetSource
extends AbstractBeanFactoryBasedTargetSource
extends AbstractBeanFactoryBasedTargetSource

TargetSource that lazily accesses a singleton bean from a BeanFactory.

Useful when a proxy reference is needed on initialization but the actual target object should not be initialized until first use. When the target bean is defined in an ApplicationContext (or a BeanFactory that is eagerly pre-instantiating singleton beans) it must be marked as "lazy-init" too, else it will be instantiated by said ApplicationContext (or 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"><idref local="serviceTarget"/></property>
     </bean>
   </property>
 </bean>

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

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:: BeanFactory.getBean(java.lang.String), 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)
          Subclasses 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, equals, getBeanFactory, getTargetBeanName, getTargetClass, hashCode, isStatic, releaseTarget, setBeanFactory, setTargetBeanName, setTargetClass, toString, writeReplace

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

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)` Subclasses 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, equals, getBeanFactory, getTargetBeanName, getTargetClass, hashCode, isStatic, releaseTarget, setBeanFactory, setTargetBeanName, setTargetClass, toString, writeReplace`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail