org.springframework.aop: public interface: TargetSource

org.springframework.aop
public interface: TargetSource [javadoc | source]

All Implemented Interfaces:
TargetClassAware

All Known Implementing Classes:
EmptyTargetSource, LazyInitTargetSource, HotSwappableTargetSource, AbstractRefreshableTargetSource, MBeanServerConnectionLazyInitTargetSource, SimpleBeanTargetSource, BeanFactoryRefreshableTargetSource, SingletonTargetSource, CommonsPoolTargetSource, PrototypeTargetSource, AbstractPoolingTargetSource, RefreshableScriptTargetSource, JndiObjectTargetSource, AbstractPrototypeBasedTargetSource, NotificationPublisherAwareLazyTargetSource, ThreadLocalTargetSource, AbstractLazyCreationTargetSource, AbstractBeanFactoryBasedTargetSource, JMXConnectorLazyInitTargetSource

A TargetSource is used to obtain the current "target" of an AOP invocation, which will be invoked via reflection if no around advice chooses to end the interceptor chain itself.

If a TargetSource is "static", it will always return the same target, allowing optimizations in the AOP framework. Dynamic target sources can support pooling, hot swapping, etc.

Application developers don't usually need to work with TargetSources directly: this is an AOP framework interface.

author: Rod - Johnson

Method from org.springframework.aop.TargetSource Summary:
getTarget, getTargetClass, isStatic, releaseTarget

Method from org.springframework.aop.TargetSource Detail:
public Object getTarget() throws Exception Return a target instance. Invoked immediately before the AOP framework calls the "target" of an AOP method invocation.
public Class getTargetClass() Return the type of targets returned by this TargetSource . Can return `null`, although certain usages of a `TargetSource` might just work with a predetermined target class.
public 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() .
public void releaseTarget(Object target) throws Exception Release the given target object obtained from the #getTarget() method.