【Spring源码解析】ProxyFactory && AOP拦截链

小灰灰 2023-07-10 11:15 1阅读 0赞

# 1 ProxyFactory类分析 #

前言：在AOP增强的Bean，是在Bean的后置处理器我们跟到AbstractAutoProxyCreator的createProxy方法。(飞机票 https://blog.csdn.net/qq\_34125999/article/details/104572875 详细的介绍了AOP和AOP加强类)  
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AOP的代理工厂，此类提供了一种在自定义用户代码中获取和配置AOP代理实例的简单方法  
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(1) setTarget，创建一个单例的代理对象

/** * Set the given object as target. * Will create a SingletonTargetSource for the object. * @see #setTargetSource * @see org.springframework.aop.target.SingletonTargetSource */
    public void setTarget(Object target) { 
       setTargetSource(new SingletonTargetSource(target));
    }

(2) addAdvice添加代理方法，该方法实现了Advice接口

@Override
    public void addAdvice(Advice advice) throws AopConfigException { 
       int pos = this.advisors.size();
       addAdvice(pos, advice);
    }

(3) getProxy() 获取代理对象，AOP代理的Bean是通过该方法增强的

//创建AOP代理对象并且得到对象
    public Object getProxy() { 
       return createAopProxy().getProxy();
    }

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# 2 MethodInterceptor类，实现了通知接口和拦截接口，用于类的加强 #

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# 3 demo #

(1) TeacherService

@Service
    public class TeacherService { 
        public void addTeacher(){ 
            System.out.println("add teacher");
        }
    }

(2) TeacherMethodInterceptor ,创建方法拦截器如果方法名等于addTeacher时那么增强方法。（在Bean初始化时，AOP会拿到切面类，判断该类是否被加强，如果被加强获取到加强的方法)

public class TeacherMethodInterceptor implements MethodInterceptor { 
        @Override
        public Object invoke(MethodInvocation invocation) throws Throwable { 
            Object proxy=null;
            // 方法名
            String methodName = invocation.getMethod().getName();
            //如果方法名等于
            if (methodName.equals("addTeacher")){ 
                System.out.println("addTeacher.........before");
                proxy = invocation.proceed();
                System.out.println("addTeacher.........after");
            }
            return proxy;
        }
    }

(3) 测试

public class SpringApplicationContext { 
        public static void main(String[] args) { 
            //1 创建代理工厂
            ProxyFactory proxyFactory = new ProxyFactory();
            //2 设置代理目标
            proxyFactory.setTarget(new TeacherService());
            //3 设置增强方法
            proxyFactory.addAdvice(new TeacherMethodInterceptor());
            //4 获取代理对象
            TeacherService proxy = (TeacherService) proxyFactory.getProxy();
            //5 执行方法
            proxy.addTeacher();
        }
    }

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# 4 AOP方法链 #

(1) 打断点debug，发现calculatorService已经被CglibAopProxy代理  
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(2) CglibAopProxy intercept方法拦截  
![在这里插入图片描述][20200302015127543.png]  
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![在这里插入图片描述][20200302015139999.png]

(3) ReflectiveMethodInvocation. proceed()方法调用  
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方法调用实现类：  
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[20200302015127543.png]: https://img-blog.csdnimg.cn/20200302015127543.png
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[20200302015139999.png]: https://img-blog.csdnimg.cn/20200302015139999.png
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