5.Spring源码系列-激活注解

介绍

在xml文件中配置<context:annotation-config/>会激活下面的注解：

• 优先级注解：@Order、@Priority
• 配置注解器：@Configuration
• 编织注解器：@Autowired、@Inject、@Value、@Resource
• @Required、@LookUp、@Lazy
• 过程处理器：@PreDestroy、@PostConstruct
• 数据持久：@PersistenceContext、 @PersistenceUnit
• 事件监听：@EventListener

调用过程

1. AnnotationConfigBeanDefinitionParser.parse

//激活注解
Set<BeanDefinitionHolder> processorDefinitions =                AnnotationConfigUtils.registerAnnotationConfigProcessors(parserContext.getRegistry(), source);

2. AnnotationConfigUtils.registerAnnotationConfigProcessors

// 优先级注解
    beanFactory.setDependencyComparator(AnnotationAwareOrderComparator.INSTANCE);
    
//
beanFactory.setAutowireCandidateResolver(new ContextAnnotationAutowireCandidateResolver());

// @Configuration
RootBeanDefinition def = new RootBeanDefinition(ConfigurationClassPostProcessor.class);

// @Autowored、@Inject、@Value
RootBeanDefinition def = new RootBeanDefinition(AutowiredAnnotationBeanPostProcessor.class);
// @Required
RootBeanDefinition def = new RootBeanDefinition(RequiredAnnotationBeanPostProcessor.class);

//@Resource、@PreDestroy、@PostConstruct
RootBeanDefinition def = new RootBeanDefinition(CommonAnnotationBeanPostProcessor.class);

//@PersistenceContext、 @PersistenceUnit
    def.setBeanClass(ClassUtils.forName(PERSISTENCE_ANNOTATION_PROCESSOR_CLASS_NAME,AnnotationConfigUtils.class.getClassLoader()));

// @EventListener   
RootBeanDefinition def = new RootBeanDefinition(EventListenerMethodProcessor.class);