org.springframework.aop.interceptor: public class: ExposeInvocationInterceptor

org.springframework.aop.interceptor
public class: ExposeInvocationInterceptor [javadoc | source]

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

All Implemented Interfaces:
org.aopalliance.intercept.MethodInterceptor, Serializable

Interceptor that exposes the current org.aopalliance.intercept.MethodInvocation as a thread-local object. We occasionally need to do this; for example, when a pointcut (e.g. an AspectJ expression pointcut) needs to know the full 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 API. 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

author: Juergen - Hoeller

Field Summary
public static final ExposeInvocationInterceptor	INSTANCE	Singleton instance of this class
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 from org.springframework.aop.interceptor.ExposeInvocationInterceptor Summary:
currentInvocation, invoke

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

Method from org.springframework.aop.interceptor.ExposeInvocationInterceptor Detail:
public static MethodInvocation currentInvocation() throws IllegalStateException { MethodInvocation mi = (MethodInvocation) invocation.get(); if (mi == null) throw new IllegalStateException( "No MethodInvocation found: Check that an AOP invocation is in progress, " + "and that the ExposeInvocationInterceptor is in the interceptor chain."); return mi; } Return the AOP Alliance MethodInvocation object associated with the current invocation.
public Object invoke(MethodInvocation mi) throws Throwable { Object old = invocation.get(); invocation.set(mi); try { return mi.proceed(); } finally { invocation.set(old); } }

Method from org.springframework.aop.interceptor.ExposeInvocationInterceptor Detail:

 public static MethodInvocation currentInvocation() throws IllegalStateException {
	                                         	 
		MethodInvocation mi = (MethodInvocation) invocation.get();
		if (mi == null)
			throw new IllegalStateException(
					"No MethodInvocation found: Check that an AOP invocation is in progress, " +
					"and that the ExposeInvocationInterceptor is in the interceptor chain.");
		return mi;
}

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

 public Object invoke(MethodInvocation mi) throws Throwable {
		Object old = invocation.get();
		invocation.set(mi);
		try {
			return mi.proceed();
		}
		finally {
			invocation.set(old);
		}
}