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/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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;
 *   }
 * }
 * 
* * @author Rod Johnson */ 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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