001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.spring.aop;
016    
017    import org.aopalliance.intercept.MethodInterceptor;
018    import org.aopalliance.intercept.MethodInvocation;
019    
020    /**
021     * @author Shuyang Zhou
022     * @author Brian Wing Shun Chan
023     */
024    public abstract class ChainableMethodAdvice implements MethodInterceptor {
025    
026            public void afterReturning(MethodInvocation methodInvocation, Object result)
027                    throws Throwable {
028            }
029    
030            public void afterThrowing(
031                            MethodInvocation methodInvocation, Throwable throwable)
032                    throws Throwable {
033            }
034    
035            public Object before(MethodInvocation methodInvocation) throws Throwable {
036                    return null;
037            }
038    
039            public void duringFinally(MethodInvocation methodInvocation) {
040            }
041    
042            @Override
043            public Object invoke(MethodInvocation methodInvocation) throws Throwable {
044                    Object returnValue = before(methodInvocation);
045    
046                    if (returnValue != null) {
047                            if (returnValue == nullResult) {
048                                    return null;
049                            }
050                            else {
051                                    return returnValue;
052                            }
053                    }
054    
055                    try {
056                            returnValue = methodInvocation.proceed();
057    
058                            afterReturning(methodInvocation, returnValue);
059                    }
060                    catch (Throwable throwable) {
061                            afterThrowing(methodInvocation, throwable);
062    
063                            throw throwable;
064                    }
065                    finally {
066                            duringFinally(methodInvocation);
067                    }
068    
069                    return returnValue;
070            }
071    
072            public void setNextMethodInterceptor(
073                    MethodInterceptor nextMethodInterceptor) {
074    
075                    this.nextMethodInterceptor = nextMethodInterceptor;
076            }
077    
078            protected void setServiceBeanAopCacheManager(
079                    ServiceBeanAopCacheManager serviceBeanAopCacheManager) {
080    
081                    if (this.serviceBeanAopCacheManager != null) {
082                            return;
083                    }
084    
085                    this.serviceBeanAopCacheManager = serviceBeanAopCacheManager;
086            }
087    
088            protected MethodInterceptor nextMethodInterceptor;
089            protected Object nullResult = new Object();
090            protected ServiceBeanAopCacheManager serviceBeanAopCacheManager;
091    
092    }