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 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:
postProcessTargetObject(java.lang.Object)
,
Serialized Form
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, toString, writeReplace |
LazyInitTargetSource
public LazyInitTargetSource()
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.
- Parameters:
targetObject
- the target object that has just been instantiated (and configured)
Copyright (c) 2002-2007 The Spring Framework Project.