Spring AOP 基于注解源码整理

导入配置类

1. EnableAspectJAutoProxy 注解导入 AspectJAutoProxyRegistrar
2. ImportBeanDefinitionRegistrar#registerBeanDefinitions向容器中加入AnnotationAwareAspectJAutoProxyCreator
3. AnnotationAwareAspectJAutoProxyCreator#initBeanFactory初始化ReflectiveAspectJAdvisorFactory

   protected void initBeanFactory(ConfigurableListableBeanFactory beanFactory) {super.initBeanFactory(beanFactory);if (this.aspectJAdvisorFactory == null) {this.aspectJAdvisorFactory = new ReflectiveAspectJAdvisorFactory(beanFactory);}this.aspectJAdvisorsBuilder =new BeanFactoryAspectJAdvisorsBuilderAdapter(beanFactory, this.aspectJAdvisorFactory);
   }
   

解析出所有的Advisor对象

1. AbstractAutoProxyCreator#postProcessBeforeInstantiation

    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;}}return null ;}
   

2. AspectJAwareAdvisorAutoProxyCreator#shouldSkip
3. AnnotationAwareAspectJAutoProxyCreator#findCandidateAdvisors
4. BeanFactoryAspectJAdvisorsBuilder#buildAspectJAdvisors
5. 获取Spring容器中被Aspect注解的bean, 通过ReflectiveAspectJAdvisorFactory#getAdvisors获取Advisor

   MetadataAwareAspectInstanceFactory factory =new BeanFactoryAspectInstanceFactory(this.beanFactory, beanName);
   List<Advisor> classAdvisors = this.advisorFactory.getAdvisors(factory);
   

6. ReflectiveAspectJAdvisorFactory#getAdvisors(factory)

   public List<Advisor> getAdvisors(MetadataAwareAspectInstanceFactory aspectInstanceFactory) {Class<?> aspectClass = aspectInstanceFactory.getAspectMetadata().getAspectClass();String aspectName = aspectInstanceFactory.getAspectMetadata().getAspectName();MetadataAwareAspectInstanceFactory lazySingletonAspectInstanceFactory =new LazySingletonAspectInstanceFactoryDecorator(aspectInstanceFactory);List<Advisor> advisors = new ArrayList<>();for (Method method : getAdvisorMethods(aspectClass)) {Advisor advisor = getAdvisor(method, lazySingletonAspectInstanceFactory, 0, aspectName);if (advisor != null) {advisors.add(advisor);}}
   }
   

生产代理对象

1. AbstractAutoProxyCreator#postProcessAfterInitialization

    public Object postProcessAfterInitialization(@Nullable Object bean, String beanName) {Object cacheKey = getCacheKey(bean.getClass(), beanName);if (this.earlyProxyReferences.remove(cacheKey) != bean) {return wrapIfNecessary(bean, beanName, cacheKey);}return bean;}
   

2. AbstractAutoProxyCreator#wrapIfNecessary

   protected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey) {// Create proxy if we have advice.Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(bean.getClass(), beanName, null);this.advisedBeans.put(cacheKey, Boolean.TRUE);Object proxy = createProxy(bean.getClass(), beanName, specificInterceptors, new SingletonTargetSource(bean));this.proxyTypes.put(cacheKey, proxy.getClass());return proxy;
   }
   

获取符合条件的Advisor集合

1. AbstractAdvisorAutoProxyCreator#getAdvicesAndAdvisorsForBean

   protected Object[] getAdvicesAndAdvisorsForBean(Class<?> beanClass, String beanName, @Nullable TargetSource targetSource) {List<Advisor> advisors = findEligibleAdvisors(beanClass, beanName);if (advisors.isEmpty()) {return DO_NOT_PROXY;}return advisors.toArray();
   }
   

2. AbstractAdvisorAutoProxyCreator#findEligibleAdvisors

   protected List<Advisor> findEligibleAdvisors(Class<?> beanClass, String beanName) {List<Advisor> candidateAdvisors = findCandidateAdvisors();List<Advisor> eligibleAdvisors = findAdvisorsThatCanApply(candidateAdvisors, beanClass, beanName);extendAdvisors(eligibleAdvisors);if (!eligibleAdvisors.isEmpty()) {eligibleAdvisors = sortAdvisors(eligibleAdvisors);}return eligibleAdvisors;
   }
   

3. AbstractAdvisorAutoProxyCreator#findAdvisorsThatCanApply

   protected List<Advisor> findAdvisorsThatCanApply(List<Advisor> candidateAdvisors, Class<?> beanClass, String beanName) {ProxyCreationContext.setCurrentProxiedBeanName(beanName);try {return AopUtils.findAdvisorsThatCanApply(candidateAdvisors, beanClass);}finally {ProxyCreationContext.setCurrentProxiedBeanName(null);}
   }
   

创建代理对象

1. AbstractAdvisorAutoProxyCreator#createProxy