Spring启动流程-2022-06-01初稿

没有实现任何排序接口的

根据InstantiationStrategy使用不同的策略来生成一般来说标有Configuration注解的会使用Cglib

finishBeanFactoryInitialization实例化所有剩余的（非lazy-init）单例

if present add the PersistenceAnnotationBeanPostProcessor

AbstractApplicationContext#invokeBeanFactoryPostProcessors()里面调用PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors方法

for循环遍历所有在beanDefinitionNames的bean

否

ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry方法

populateBean属性赋值

MergedBeanDefinitionPostProcessor

getBean方法

应用场景

先执行BeanDefinitionRegistryPostProcessors

instantiateBean

invokeBeanFactoryPostProcessors调用在上下文中注册为bean的工厂处理器。

PropertyValues是否为空

大于

核心是把传入的配置类注册到beanDefinitionMap

spring的自动装配后处理器在此工作直接返回true

是

AnnotationConfigUtils.registerAnnotationConfigProcessors(this.registry);

processConfigBeanDefinitions查找类上标注Configuration注解的类

beanFactory.addBeanPostProcessor(postProcessor)

是否提前创建了对象

registerBeanPostProcessors注册BeanPostProcessor拦截器

通过beanFactory.getBeanNamesForType查找

循环创建BeanPostProcessor对象

ConfigurationClassPostProcessor实现BeanDefinitionRegistryPostProcessor

applyMergedBeanDefinitionPostProcessors

PriorityOrdered

刚开始的时候的是ConfigurationClassPostProcessor用于处理@Configuration注解

注册BeanPostProcessor

ApplicationContextAwareProcessor注入Aware相关组件

结束

ConfigurationClassParser.processConfigurationClass

回调SmartInstantiationAwareBeanPostProcessor.determineCandidateConstructors

DefaultEventListenerFactory实现EventListenerFactory

determineConstructorsFromBeanPostProcessors决定使用哪个构造器

通过singletonFactory.getObject()进行回调

applyBeanPostProcessorsBeforeInitialization

核心是注册5个类到beanDefinitionMap

postProcessBeanFactory对bean工厂进行后置处理子类实现

可以再次修改属性InitializingBean.afterPropertiesSet

获取LoadTimeWeaverAware

beanFactory添加addBeanPostProcessor(ApplicationContextAwareProcessor)addBeanPostProcessor(ApplicationListenerDetector)忽略ignoreDependencyInterface依赖接口包括EnvironmentAwareEmbeddedValueResolverAwareResourceLoaderAwareApplicationEventPublisherAwareMessageSourceAwareApplicationContextAwareApplicationStartupAware注册registerSingleton环境变量包括environmentsystemPropertiessystemEnvironmentapplicationStartup

beanFactory.preInstantiateSingletons()

doCreateBean

invokeAwareMethods主要处理BeanNameAwareBeanClassLoaderAwareBeanFactoryAware

applyBeanPostProcessorsAfterInitialization

prepareBeanFactory配置工厂的标准上下文特征例如上下文的 ClassLoader 和后处理器

doGetBeanNamesForType(ApplicationListener.clss)

BeanPostProcessor

InstantiationAwareBeanPostProcessor.postProcessPropertyValues

resolveBeforeInstantiationBeanPostProcessors 有机会返回一个代理而不是目标 bean 实例。

factory是否持有InstantiationAwareBeanPostProcessor

AnnotationConfigApplicationContext构造方法

ConfigurationClassParser.doProcessConfigurationClass

SmartInstantiationAwareBeanPostProcessor是InstantiationAwareBeanPostProcessor的子类

CommonAnnotationBeanPostProcessor

CommonAnnotationBeanPostProcessor实现InstantiationAwareBeanPostProcessor

AutowiredAnnotationBeanPostProcessor

BeanNameAwareBeanFactoryAwarefont color=\"#ff0000\

找到ConfigurationClassPostProcessor

createBean

InstantiationAwareBeanPostProcessor

register(componentClasses)注册一个或多个要处理的组件类

obtainFreshBeanFactory获取DefaultListableBeanFactory工厂

调用PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors来回调postProcessBeanFactory方法

PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors执行所有的BeanFactoryPostProcessor

无需特殊处理：只需使用无参数构造函数

createBeanInstance

是否是InitializingBean

主要处理BeanPostProcessor.postProcessAfterInitialization

自定义的没有排序BeanPostProcessor

getBean来获取(没有的话进行创建过程)ConfigurationClassPostProcessor具体下面在分析getBean过程

EventListenerMethodProcessor实现BeanFactoryPostProcessor

主要处理BeanPostProcessor.postProcessBeforeInitialization

Ordered

SmartInstantiationAwareBeanPostProcessor.predictBeanType()决定当前未初始化的组件类型

创建/获取bean结束

对给定的属性值进行后处理 到给定的bean(自动装配)InstantiationAwareBeanPostProcessor.postProcessProperties

ConfigurationClassParser.parse处理候选类

invokeInitMethods

调用PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors来回调postProcessBeanDefinitionRegistry方法

applyBeanPostProcessorsBeforeInstantiation

最重要的refresh()方法

registerBeanPostProcessors

触发调用

获取到PropertyValues