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     */
019    package 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     */
029    public 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    }