aop bean增强

拼搏现实的明天。 2022-10-22 14:52 181阅读 0赞

主要的两个类  
org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor  
org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator

AOP下的实现类  
org.springframework.validation.beanvalidation.MethodValidationPostProcessor

org.springframework.beans.factory.xml.NamespaceHandler 定制化xsd扩展的时候的解析器

org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator

org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor\#postProcessAfterInitialization

@Override  
public Object postProcessAfterInitialization(Object bean, String beanName) \{  
1、 if (this.advisor == null || bean instanceof AopInfrastructureBean) \{  
// Ignore AOP infrastructure such as scoped proxies.  
return bean;  
\}

2、 if (bean instanceof Advised) \{  
Advised advised = (Advised) bean;  
if (!advised.isFrozen() && isEligible(AopUtils.getTargetClass(bean))) \{ 判断能不能处理 增强  
// Add our local Advisor to the existing proxy’s Advisor chain…  
if (this.beforeExistingAdvisors) \{

advised.addAdvisor(0, this.advisor);
    			}
    			else {
    				advised.addAdvisor(this.advisor);      MethodValidationPostProcessor  方法级增强 将创建好的默认对象加入到代理类中
    			}
    			return bean;
    		}
    	}

3、 if (isEligible(bean, beanName)) \{ 是不是有代理资格 beanName字段没啥用  
ProxyFactory proxyFactory = prepareProxyFactory(bean, beanName);  
if (!proxyFactory.isProxyTargetClass()) \{  
evaluateProxyInterfaces(bean.getClass(), proxyFactory);  
\}  
proxyFactory.addAdvisor(this.advisor);  
customizeProxyFactory(proxyFactory);  
return proxyFactory.getProxy(getProxyClassLoader());  
\}

// No proxy needed.

4、 return bean;  
\}

1、 部分case不做增强  
aop顶级接口 标记不会被代理 默认不做任何处理  
org.springframework.aop.framework.AopInfrastructureBean  
advisor 具体增强实现类没有 不做任何处理  
org.springframework.aop.Advisor 赋值 不同的子类 不同的赋值方式  
org.springframework.scheduling.annotation.AsyncAnnotationBeanPostProcessor\#setBeanFactory  
org.springframework.validation.beanvalidation.MethodValidationPostProcessor\#afterPropertiesSet  
org.springframework.aop.support.DefaultPointcutAdvisor 创建默认的对象

2、 没有冻结并且目标类可以代理则将 具体切点植入到对象中

aop操作接口 （据说任何AOP的类均可转换成这个接口）  
由包含AOP代理工厂配置的类实现的接口。此配置包括拦截器和其他建议，顾问以及代理接口。  
org.springframework.aop.framework.Advised

org.springframework.aop.framework.Advised\#isFrozen 被冻结对象无法修改

org.springframework.aop.support.AopUtils\#getTargetClass 返回AOP代理的目标类 如果非AOP代理则返回该对象

beforeExistingAdvisors 根据这个值决定植入的次序是 滞后还是提前

3、 当前类能否代理  
初始化一个ProxyFactory 初始化默认 proxyTargetClass =false （从当前拷贝 如果处理过则 proxyTargetClass 可能为true）  
org.springframework.aop.framework.ProxyProcessorSupport\#evaluateProxyInterfaces  
增加AOP增加实例  
org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor\#customizeProxyFactory 定制化需求 无实现  
返回代理类

4、 不符合任何信息 不做代理

org.springframework.context.support.AbstractApplicationContext\#finishBeanFactoryInitialization  
容器初始化 触发对象实例化 触发创建代理

org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator\#postProcessBeforeInstantiation

@Override
    public Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) {
    	Object cacheKey = getCacheKey(beanClass, beanName);
    
    	if (!StringUtils.hasLength(beanName) || !this.targetSourcedBeans.contains(beanName)) {
    		if (this.advisedBeans.containsKey(cacheKey)) {
    			return null;
    		}
    		if (isInfrastructureClass(beanClass) || shouldSkip(beanClass, beanName)) {
    			this.advisedBeans.put(cacheKey, Boolean.FALSE);
    			return null;
    		}
    	}
    
    	// Create proxy here if we have a custom TargetSource.
    	// Suppresses unnecessary default instantiation of the target bean:
    	// The TargetSource will handle target instances in a custom fashion.
    	TargetSource targetSource = getCustomTargetSource(beanClass, beanName);
    	if (targetSource != null) {
    		if (StringUtils.hasLength(beanName)) {
    			this.targetSourcedBeans.add(beanName);
    		}
    		Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(beanClass, beanName, targetSource);
    		Object proxy = createProxy(beanClass, beanName, specificInterceptors, targetSource);
    		this.proxyTypes.put(cacheKey, proxy.getClass());
    		return proxy;
    	}
    
    	return null;
    }

org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator\#postProcessAfterInitialization  
@Override  
public Object postProcessAfterInitialization(@Nullable Object bean, String beanName) \{  
if (bean != null) \{  
Object cacheKey = getCacheKey(bean.getClass(), beanName);  
if (this.earlyProxyReferences.remove(cacheKey) != bean) \{  
return wrapIfNecessary(bean, beanName, cacheKey);  
\}  
\}  
return bean;  
\}

beanPostProcessors = \{CopyOnWriteArrayList@4802\} size = 9  
4 = \{AnnotationAwareAspectJAutoProxyCreator@5782\} “proxyTargetClass=true; optimize=false; opaque=false; exposeProxy=false; frozen=false”  
5 = \{MethodValidationPostProcessor@5758\} “proxyTargetClass=true; optimize=false; opaque=false; exposeProxy=false; frozen=false”