001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.shiro.aop;
020
021/**
022 * A <tt>MethodInterceptor</tt> intercepts a <tt>MethodInvocation</tt> to perform before or after logic (aka 'advice').
023 *
024 * <p>Shiro's implementations of this interface mostly have to deal with ensuring a current Subject has the
025 * ability to execute the method before allowing it to continue.
026 *
027 * @since 0.2
028 */
029public interface MethodInterceptor {
030
031    /**
032     * Invokes the specified <code>MethodInvocation</code>, allowing implementations to perform pre/post/finally
033     * surrounding the actual invocation.
034     *
035     * @param methodInvocation the <code>MethodInvocation</code> to execute.
036     * @return the result of the invocation
037     * @throws Throwable if the method invocation throws a Throwable or if an error occurs in pre/post/finally advice.
038     */
039    Object invoke(MethodInvocation methodInvocation) throws Throwable;
040
041}