org.springframework.aop.target: public class: LazyInitTargetSource

org.springframework.aop.target
public class: LazyInitTargetSource [javadoc | source]

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

All Implemented Interfaces:
TargetSource, BeanFactoryAware, Serializable

Direct Known Subclasses:
NotificationPublisherAwareLazyTargetSource

org.springframework.aop.TargetSource that lazily accesses a singleton bean from a org.springframework.beans.factory.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 org.springframework.context.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.

Also see:

org.springframework.beans.factory.BeanFactory#getBean

postProcessTargetObject

author: Juergen - Hoeller

author: Rob - Harrop

since: 1.1.4 -

Fields inherited from org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource:
logger

Method from org.springframework.aop.target.LazyInitTargetSource Summary:
getTarget, postProcessTargetObject

Methods from org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource:
copyFrom, equals, getBeanFactory, getTargetBeanName, getTargetClass, hashCode, isStatic, releaseTarget, setBeanFactory, setTargetBeanName, setTargetClass, toString, writeReplace

Methods from java.lang.Object:
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from org.springframework.aop.target.LazyInitTargetSource Detail:
public synchronized Object getTarget() throws BeansException { if (this.target == null) { this.target = getBeanFactory().getBean(getTargetBeanName()); postProcessTargetObject(this.target); } return this.target; }
protected void postProcessTargetObject(Object targetObject) { } Subclasses may override this method to perform additional processing on the target object when it is first loaded.

Method from org.springframework.aop.target.LazyInitTargetSource Detail:

 public synchronized Object getTarget() throws BeansException {
		if (this.target == null) {
			this.target = getBeanFactory().getBean(getTargetBeanName());
			postProcessTargetObject(this.target);
		}
		return this.target;
}

 protected  void postProcessTargetObject(Object targetObject) {

}

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