spring AOP 概述 Advisor
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Advisor通知器
完成对目标方法的切面增强设计(Advice)和关注点的设计(Pointcut)以后,需要一个对象把它们结合起来,完成这个作用的就是Advisor(通知器)。通过Advisor,可以
定义应该使用哪个通知并在哪个关注点使用它,也就是说通过Advisor,把Advice和Pointcut结合起来。
我们以一个Advisor的实现(DefaultPointcutAdvisor)为例,来了解Advisor的工作原理,在DefaultPointcutAdvisor中,有两个属性,分别是advice和pointcut
1 /* 2 * Copyright 2002-2012 the original author or authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package org.springframework.aop.support; 18 19 import java.io.Serializable; 20 21 import org.aopalliance.aop.Advice; 22 23 import org.springframework.aop.Pointcut; 24 25 /** 26 * Convenient Pointcut-driven Advisor implementation. 27 * 28 * <p>This is the most commonly used Advisor implementation. It can be used 29 * with any pointcut and advice type, except for introductions. There is 30 * normally no need to subclass this class, or to implement custom Advisors. 31 * 32 * @author Rod Johnson 33 * @author Juergen Hoeller 34 * @see #setPointcut 35 * @see #setAdvice 36 */ 37 @SuppressWarnings("serial") 38 public class DefaultPointcutAdvisor extends AbstractGenericPointcutAdvisor implements Serializable { 39 40 private Pointcut pointcut = Pointcut.TRUE; 41 42 43 /** 44 * Create an empty DefaultPointcutAdvisor. 45 * <p>Advice must be set before use using setter methods. 46 * Pointcut will normally be set also, but defaults to {@code Pointcut.TRUE}. 47 */ 48 public DefaultPointcutAdvisor() { 49 } 50 51 /** 52 * Create a DefaultPointcutAdvisor that matches all methods. 53 * <p>{@code Pointcut.TRUE} will be used as Pointcut. 54 * @param advice the Advice to use 55 */ 56 public DefaultPointcutAdvisor(Advice advice) { 57 this(Pointcut.TRUE, advice); 58 } 59 60 /** 61 * Create a DefaultPointcutAdvisor, specifying Pointcut and Advice. 62 * @param pointcut the Pointcut targeting the Advice 63 * @param advice the Advice to run when Pointcut matches 64 */ 65 public DefaultPointcutAdvisor(Pointcut pointcut, Advice advice) { 66 this.pointcut = pointcut; 67 setAdvice(advice); 68 } 69 70 71 /** 72 * Specify the pointcut targeting the advice. 73 * <p>Default is {@code Pointcut.TRUE}. 74 * @see #setAdvice 75 */ 76 public void setPointcut(Pointcut pointcut) { 77 this.pointcut = (pointcut != null ? pointcut : Pointcut.TRUE); 78 } 79 80 public Pointcut getPointcut() { 81 return this.pointcut; 82 } 83 84 85 @Override 86 public String toString() { 87 return getClass().getName() + ": pointcut [" + getPointcut() + "]; advice [" + getAdvice() + "]"; 88 } 89 90 }
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