6.1 Spring启动流程-internalConfigurationAnnotationProcessor-注册时机

这个是一个非常非常非常重要的processor

初始化时机

这个对象是在什么时候添加进去的呢
在这个AnnotationConfigServletWebServerApplicationContext类初始化的时候

 public AnnotationConfigServletWebServerApplicationContext() {
        this.annotatedClasses = new LinkedHashSet();
        // 就在这一句 好神奇 剩下的自己看代码的,很简单 添加了几个默认的 但是很重要的类 
         // spring源码难读就在这里，你觉得他不重要他藏着重要的东西
        // 你觉得他重要的 跳来跳去就干了那么点事儿
        // 举重若轻 举轻若重吧
        this.reader = new AnnotatedBeanDefinitionReader(this);
        this.scanner = new ClassPathBeanDefinitionScanner(this);
    }
    
      public AnnotatedBeanDefinitionReader(BeanDefinitionRegistry registry) {
        this(registry, getOrCreateEnvironment(registry));
    }

    public AnnotatedBeanDefinitionReader(BeanDefinitionRegistry registry, Environment environment) {
        this.beanNameGenerator = new AnnotationBeanNameGenerator();
        this.scopeMetadataResolver = new AnnotationScopeMetadataResolver();
        Assert.notNull(registry, "BeanDefinitionRegistry must not be null");
        Assert.notNull(environment, "Environment must not be null");
        this.registry = registry;
        this.conditionEvaluator = new ConditionEvaluator(registry, environment, (ResourceLoader)null);
		//这里
        AnnotationConfigUtils.registerAnnotationConfigProcessors(this.registry);
    }
    public static Set<BeanDefinitionHolder> registerAnnotationConfigProcessors(BeanDefinitionRegistry registry, @Nullable Object source) {
        DefaultListableBeanFactory beanFactory = unwrapDefaultListableBeanFactory(registry);
        if (beanFactory != null) {
            if (!(beanFactory.getDependencyComparator() instanceof AnnotationAwareOrderComparator)) {
                beanFactory.setDependencyComparator(AnnotationAwareOrderComparator.INSTANCE);
            }

            if (!(beanFactory.getAutowireCandidateResolver() instanceof ContextAnnotationAutowireCandidateResolver)) {
                beanFactory.setAutowireCandidateResolver(new ContextAnnotationAutowireCandidateResolver());
            }
        }

        Set<BeanDefinitionHolder> beanDefs = new LinkedHashSet(8);
        RootBeanDefinition def;
		//就是在这里添加了这个重要的Processor
        if (!registry.containsBeanDefinition("org.springframework.context.annotation.internalConfigurationAnnotationProcessor")) {
            def = new RootBeanDefinition(ConfigurationClassPostProcessor.class);
            def.setSource(source);
            beanDefs.add(registerPostProcessor(registry, def, "org.springframework.context.annotation.internalConfigurationAnnotationProcessor"));
        }

        if (!registry.containsBeanDefinition("org.springframework.context.annotation.internalAutowiredAnnotationProcessor")) {
            def = new RootBeanDefinition(AutowiredAnnotationBeanPostProcessor.class);
            def.setSource(source);
            beanDefs.add(registerPostProcessor(registry, def, "org.springframework.context.annotation.internalAutowiredAnnotationProcessor"));
        }

        if (jsr250Present && !registry.containsBeanDefinition("org.springframework.context.annotation.internalCommonAnnotationProcessor")) {
            def = new RootBeanDefinition(CommonAnnotationBeanPostProcessor.class);
            def.setSource(source);
            beanDefs.add(registerPostProcessor(registry, def, "org.springframework.context.annotation.internalCommonAnnotationProcessor"));
        }

        if (jpaPresent && !registry.containsBeanDefinition("org.springframework.context.annotation.internalPersistenceAnnotationProcessor")) {
            def = new RootBeanDefinition();

            try {
                def.setBeanClass(ClassUtils.forName("org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor", AnnotationConfigUtils.class.getClassLoader()));
            } catch (ClassNotFoundException var6) {
                throw new IllegalStateException("Cannot load optional framework class: org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor", var6);
            }

            def.setSource(source);
            beanDefs.add(registerPostProcessor(registry, def, "org.springframework.context.annotation.internalPersistenceAnnotationProcessor"));
        }

        if (!registry.containsBeanDefinition("org.springframework.context.event.internalEventListenerProcessor")) {
            def = new RootBeanDefinition(EventListenerMethodProcessor.class);
            def.setSource(source);
            beanDefs.add(registerPostProcessor(registry, def, "org.springframework.context.event.internalEventListenerProcessor"));
        }

        if (!registry.containsBeanDefinition("org.springframework.context.event.internalEventListenerFactory")) {
            def = new RootBeanDefinition(DefaultEventListenerFactory.class);
            def.setSource(source);
            beanDefs.add(registerPostProcessor(registry, def, "org.springframework.context.event.internalEventListenerFactory"));
        }

        return beanDefs;
    }

ps

刚开始的beanFactory.getBeanDefinitionNames就这些个

0 = "org.springframework.context.annotation.internalConfigurationAnnotationProcessor"
1 = "org.springframework.context.annotation.internalAutowiredAnnotationProcessor"
2 = "org.springframework.context.annotation.internalCommonAnnotationProcessor"
3 = "org.springframework.context.event.internalEventListenerProcessor"
4 = "org.springframework.context.event.internalEventListenerFactory"
5 = "application"