spring-framework / org.springframework.aop.target / LazyInitTargetSource

LazyInitTargetSource

open class LazyInitTargetSource : AbstractBeanFactoryBasedTargetSource

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.

Author
Juergen Hoeller

Author
Rob Harrop

Since
1.1.4

See Also
org.springframework.beans.factory.BeanFactory#getBean#postProcessTargetObject

Constructors

<init>

 LazyInitTargetSource()

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.

Functions

getTarget

 open fun getTarget(): Any