自动配置原理调用流程

processConfigurationClass

SPI获取EnableAutoConfiguration为key的所有实现类

1.创建AutoConfigurationGroup2.在configurationClasses缓存

selectImports();

AnnotationConfigServletWebServerApplicationContextspringBoot的上下文对象

register

ConfigurationClassPostProcessor

processGroupImports();

process

getAttributes(annotationMetadata);

ConfigurationClassParser.DeferredImportSelectorGroupingHandler

postProcessBeanDefinitionRegistry

getCandidateConfigurations

Iterable

grouop.process

ConfigurationClassParser.DeferredImportSelectorGrouping

processImports

先回执行下面的handle方法创建holder对象才可以完成process的调用

processConfigBeanDefinitions

parse

postProcessor.postProcessBeanDefinitionRegistry

getAutoConfigurationEntry

AutoConfigurationImportSelector.AutoConfigurationGroup

invokeBeanDefinitionRegistryPostProcessors

getImports

handle

循环调用processImports大多数会processConfigurationClass

缓存中取出来转成集合返回

通过SPI获取过滤器。再执行过滤操作

AutoConfigurationImportSelector

getImportGrougetImportGroup

filter

获取到AutoConfigurationGroup的class对象

缓存autoConfigurationEntries

包装成AutoConfigurationEntry

doProcessConfigurationClass

refresh

自动配置原理调用与解析

PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors

handle中做的事有点诡异。下面判断基本不会成立this.deferredImportSelectors == null所以呢也不会执行register会在后面process完成这里就是创建holder对象（DeferredImportSelectorHolder）然后缓存进去this.deferredImportSelectors.add(holder);

ConfigurationClassParser

ConfigurationClassParser.DeferredImportSelectorHandler

invokeBeanFactoryPostProcessors