Package 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
,Aware
,BeanFactoryAware
public class LazyInitTargetSource extends AbstractBeanFactoryBasedTargetSource
TargetSource
that lazily accesses a singleton bean from aBeanFactory
.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 aBeanFactory
that is eagerly pre-instantiating singleton beans) it must be marked as "lazy-init" too, else it will be instantiated by saidApplicationContext
(orBeanFactory
) 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
Constructors Constructor Description LazyInitTargetSource()
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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
Constructor Detail
LazyInitTargetSource
public LazyInitTargetSource()
Method Detail
getTarget
@Nullable 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 which contains the joinpoint, or
null
if there is no actual target instance - Throws:
BeansException
postProcessTargetObject
protected void postProcessTargetObject(Object targetObject)
Subclasses may override this method to perform additional processing on the target object when it is first loaded.- Parameters:
targetObject
- the target object that has just been instantiated (and configured)