ExposeInvocationInterceptor (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.aop.interceptor
Class ExposeInvocationInterceptor

java.lang.Object
  org.springframework.aop.interceptor.ExposeInvocationInterceptor

All Implemented Interfaces:: Serializable, Advice, Interceptor, MethodInterceptor

public class ExposeInvocationInterceptor
extends Object
implements MethodInterceptor, Serializable
extends Object
implements MethodInterceptor, Serializable

Interceptor that exposes the current MethodInvocation. We occasionally need to do this; for example, when a pointcut or target object needs to know the Invocation context.

Don't use this interceptor unless this is really necessary. Target objects should not normally know about Spring AOP, as this creates a dependency on Spring. Target objects should be plain POJOs as far as possible.

If used, this interceptor will normally be the first in the interceptor chain.

Author:: Rod Johnson
See Also:: Serialized Form

Field Summary

static Advisor ADVISOR
          Singleton advisor for this class.

static ExposeInvocationInterceptor INSTANCE
          Singleton instance of this class

Method Summary

static MethodInvocation currentInvocation()
          Return the AOP Alliance MethodInvocation object associated with the current invocation.

Object invoke(MethodInvocation mi)


Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Summary
`static Advisor`	`ADVISOR` Singleton advisor for this class.
`static ExposeInvocationInterceptor`	`INSTANCE` Singleton instance of this class

Method Summary
`static MethodInvocation`	`currentInvocation()` Return the AOP Alliance MethodInvocation object associated with the current invocation.
`Object`	`invoke(MethodInvocation mi)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

INSTANCE

public static final ExposeInvocationInterceptor INSTANCE

Singleton instance of this class

ADVISOR

public static final Advisor ADVISOR

Singleton advisor for this class. Use in preference to INSTANCE when using Spring AOP, as it prevents the need to create a new Advisor to wrap the instance.

Method Detail

currentInvocation

public static MethodInvocation currentInvocation()
                                          throws IllegalStateException

Return the AOP Alliance MethodInvocation object associated with the current invocation.

Returns:: the invocation object associated with the current invocation
Throws:: IllegalStateException - if there is no AOP invocation in progress, or if the ExposeInvocationInterceptor was not added to this interceptor chain

invoke

public Object invoke(MethodInvocation mi)
              throws Throwable

Specified by:: invoke in interface MethodInterceptor

Throws:: Throwable