org.aopalliance.intercept

Interface MethodInterceptor

All Superinterfaces:

Advice, Interceptor

All Known Subinterfaces:

IntroductionInterceptor

All Known Implementing Classes:

AbstractMonitoringInterceptor, AbstractTraceInterceptor, AfterReturningAdviceInterceptor, AspectJAfterAdvice, AspectJAfterThrowingAdvice, AspectJAroundAdvice, AsyncExecutionInterceptor, ConcurrencyThrottleInterceptor, CustomizableTraceInterceptor, DebugInterceptor, DelegatePerTargetObjectIntroductionInterceptor, DelegatingIntroductionInterceptor, ExposeInvocationInterceptor, JamonPerformanceMonitorInterceptor, MethodBeforeAdviceInterceptor, PerformanceMonitorInterceptor, SimpleTraceInterceptor, ThrowsAdviceInterceptor

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface MethodInterceptor
extends Interceptor

Intercepts calls on an interface on its way to the target. These are nested "on top" of the target.

The user should implement the invoke(MethodInvocation) method to modify the original behavior. E.g. the following class implements a tracing interceptor (traces all the calls on the intercepted method(s)):

 class TracingInterceptor implements MethodInterceptor {
   Object invoke(MethodInvocation i) throws Throwable {
     System.out.println("method "+i.getMethod()+" is called on "+
                        i.getThis()+" with args "+i.getArguments());
     Object ret=i.proceed();
     System.out.println("method "+i.getMethod()+" returns "+ret);
     return ret;
   }
 }
 

Author:

Rod Johnson

Method Summary

Modifier and Type	Method and Description
Object	invoke(MethodInvocation invocation) Implement this method to perform extra treatments before and after the invocation.

Method Detail

invoke

Object invoke(MethodInvocation invocation)
       throws Throwable

Implement this method to perform extra treatments before and after the invocation. Polite implementations would certainly like to invoke Joinpoint.proceed().

Parameters:

invocation - the method invocation joinpoint

Returns:

the result of the call to Joinpoint.proceed(); might be intercepted by the interceptor

Throws:

Throwable - if the interceptors or the target object throws an exception