org.aopalliance.intercept

Interface MethodInterceptor

All Superinterfaces:
Advice, Interceptor

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;
   }
 }
 

Method Summary

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

Method Details

invoke

public 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.