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package org.aopalliance.intercept;

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

The user should implement the {@link #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;
 *   }
 * }
 * 
*/ public interface MethodInterceptor extends Interceptor { /** * Implement this method to perform extra treatments before and * after the invocation. Polite implementations would certainly * like to invoke {@link Joinpoint#proceed()}. * * @param invocation the method invocation joinpoint * @return the result of the call to {@link * Joinpoint#proceed()}, might be intercepted by the * interceptor. * * @throws Throwable if the interceptors or the * target-object throws an exception. */ Object invoke(MethodInvocation invocation) throws Throwable; }




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