SpringBoot 刷新上下文6--加载并注册BeanDefinition

SpringBoot刷新上下文一共七篇，基于SpringBoot 2.2.7.RELEASE，Spring 5.2.6.RELEASE
SpringBoot 刷新上下文1–主流程
SpringBoot 刷新上下文2–执行BeanDefinitionRegistryPostProcessor
SpringBoot 刷新上下文3–解析引导类
SpringBoot 刷新上下文4–处理ComponentScan
SpringBoot 刷新上下文5–处理其他注解
SpringBoot 刷新上下文6–加载并注册BeanDefinition
SpringBoot 刷新上下文7–执行BeanFactoryPostProcessor

2.1.4、加载并注册BeanDefinition

//org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader#loadBeanDefinitions
public void loadBeanDefinitions(Set<ConfigurationClass> configurationModel) {
   
    TrackedConditionEvaluator trackedConditionEvaluator = new TrackedConditionEvaluator();
    //循环所有的配置类
    for (ConfigurationClass configClass : configurationModel) {
   
        loadBeanDefinitionsForConfigurationClass(configClass, trackedConditionEvaluator);
    }
}

private final ImportRegistry importRegistry;
//org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader#loadBeanDefinitionsForConfigurationClass
private void loadBeanDefinitionsForConfigurationClass(ConfigurationClass configClass, TrackedConditionEvaluator trackedConditionEvaluator) {
   
    //是否应该跳过	Condition的一些列注解
    if (trackedConditionEvaluator.shouldSkip(configClass)) {
   
        //获取配置类的名称
        String beanName = configClass.getBeanName();
        if (StringUtils.hasLength(beanName) && this.registry.containsBeanDefinition(beanName)) {
   
            //将配置类从ioc中移除
            this.registry.removeBeanDefinition(beanName);
        }
        //将配置类移除
        this.importRegistry.removeImportingClass(configClass.getMetadata().getClassName());
        return;
    }
	//加载导入类
    if (configClass.isImported()) {
   
        registerBeanDefinitionForImportedConfigurationClass(configClass);
    }
    //加载@Bean标注的方法
    for (BeanMethod beanMethod : configClass.getBeanMethods()) {
   
        loadBeanDefinitionsForBeanMethod(beanMethod);
    }
	//加载导入资源
    loadBeanDefinitionsFromImportedResources(configClass.getImportedResources());
    //加载Registrar
     loadBeanDefinitionsFromRegistrars(configClass.getImportBeanDefinitionRegistrars());
}

2.1.4.1、处理导入类

//org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader#loadBeanDefinitionsFromRegistrars
private void loadBeanDefinitionsFromRegistrars(Map<ImportBeanDefinitionRegistrar, AnnotationMetadata> registrars) {
   
    //遍历所有ImportBeanDefinitionRegistrar的实现类
    registrars.forEach((registrar, metadata) ->
                       registrar.registerBeanDefinitions(metadata, this.registry, this.importBeanNameGenerator));
}

//org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader#registerBeanDefinitionForImportedConfigurationClass
private void registerBeanDefinitionForImportedConfigurationClass(ConfigurationClass configClass) {
   
    //获取配置类的注解元数据
    AnnotationMetadata metadata = configClass.getMetadata();
    //创建BeanDefinition
    AnnotatedGenericBeanDefinition configBeanDef = new AnnotatedGenericBeanDefinition(metadata);
	//解析Scope
    ScopeMetadata scopeMetadata = scopeMetadataResolver.resolveScopeMetadata(configBeanDef);
    configBeanDef.setScope(scopeMetadata.getScopeName());
    //获取BeanName
    String configBeanName = this.importBeanNameGenerator.generateBeanName(configBeanDef, this.registry);
    //处理通用注解
    AnnotationConfigUtils.processCommonDefinitionAnnotations(configBeanDef, metadata);
	//创建BeanDefinitionHolder
    BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(configBeanDef,