LazyInitTargetSource

Class Overview

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>

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

Summary

[Expand] Inherited Fields
From class org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource protected final Log logger Logger available to subclasses

[Expand] Inherited Methods
From class org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource void copyFrom(AbstractBeanFactoryBasedTargetSource other) Copy configuration from the other AbstractBeanFactoryBasedTargetSource object. boolean equals(Object other) BeanFactory getBeanFactory() Return the owning BeanFactory. String getTargetBeanName() Return the name of the target bean in the factory. synchronized Class<?> getTargetClass() Return the type of targets returned by this TargetSource. int hashCode() boolean isStatic() Will all calls to getTarget() return the same object? In that case, there will be no need to invoke releaseTarget(Object), and the AOP framework can cache the return value of getTarget(). void releaseTarget(Object target) Release the given target object obtained from the getTarget() method. void setBeanFactory(BeanFactory beanFactory) Set the owning BeanFactory. void setTargetBeanName(String targetBeanName) Set the name of the target bean in the factory. void setTargetClass(Class targetClass) Specify the target class explicitly, to avoid any kind of access to the target bean (for example, to avoid initialization of a FactoryBean instance). String toString()
From class java.lang.Object Object clone() boolean equals(Object arg0) void finalize() final Class<?> getClass() int hashCode() final void notify() final void notifyAll() String toString() final void wait() final void wait(long arg0, int arg1) final void wait(long arg0)
From interface org.springframework.aop.TargetClassAware abstract Class<?> getTargetClass() Return the target class behind the implementing object (typically a proxy configuration or an actual proxy).
From interface org.springframework.aop.TargetSource abstract Object getTarget() Return a target instance. abstract Class<?> getTargetClass() Return the type of targets returned by this TargetSource. abstract boolean isStatic() Will all calls to getTarget() return the same object? In that case, there will be no need to invoke releaseTarget(Object), and the AOP framework can cache the return value of getTarget(). abstract void releaseTarget(Object target) Release the given target object obtained from the getTarget() method.
From interface org.springframework.beans.factory.BeanFactoryAware abstract void setBeanFactory(BeanFactory beanFactory) Callback that supplies the owning factory to a bean instance.