程序包 infra.aop.target

类 LazyInitTargetSource

java.lang.Object

infra.aop.target.AbstractBeanFactoryTargetSource

infra.aop.target.LazyInitTargetSource

所有已实现的接口:

TargetClassAware, TargetSource, infra.beans.factory.Aware, infra.beans.factory.BeanFactoryAware, Serializable

public class LazyInitTargetSource
extends AbstractBeanFactoryTargetSource

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 infra.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="infra.aop.framework.ProxyFactoryBean">
   <property name="targetSource">
     <bean class="infra.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.

从以下版本开始:

4.0

作者:

Juergen Hoeller, Rob Harrop

另请参阅:

• BeanFactory.getBean(java.lang.String)
• postProcessTargetObject(java.lang.Object)
• 序列化表格

字段概要

字段

修饰符和类型	字段	说明
private Object	target

从类继承的字段 infra.aop.target.AbstractBeanFactoryTargetSource

logger

构造器概要

构造器

构造器	说明
LazyInitTargetSource()

方法概要

修饰符和类型	方法	说明
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.

从类继承的方法 infra.aop.target.AbstractBeanFactoryTargetSource

copyFrom, equals, getBeanFactory, getTargetBeanName, getTargetClass, hashCode, isStatic, releaseTarget, setBeanFactory, setTargetBeanName, setTargetClass, toString

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

字段详细资料

target

@Nullable
private Object target

构造器详细资料

LazyInitTargetSource

public LazyInitTargetSource()

方法详细资料

getTarget

@Nullable
public Object getTarget()
                 throws infra.beans.BeansException

从接口复制的说明: TargetSource

Return a target instance. Invoked immediately before the AOP framework calls the "target" of an AOP method invocation.

返回:

the target object which contains the join-point, or null if there is no actual target instance

抛出:

infra.beans.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.

参数:

targetObject - the target object that has just been instantiated (and configured)