SpringBoot启动源码分析_ROCK

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SpringBoot启动源码分析

(2022-05-03 15:05:42)

分类： JAVA开发

new SpringApplication()
initializer <-- get spring factory instances

listenner <-- get spring factory instances

createApplicationContext()

    # ConfigurationClassPostProcessor 注册 internalConfigurationAnnotationProcessor
   this.reader = new AnnotatedBeanDefinitionReader(this);

   this.scanner = new ClassPathBeanDefinitionScanner(this);

prepareContext()

    load() <-- primary source class

注：

SpringFactoriesLoader   <-- spring.factories

DefaultListableBeanFactory :: registerBeanDefinition

SingletonBeanRegistry :: registerSingleton

ConfigurableApplicationContext environment bean name 定义

AbstractApplicationContext :: prepareBeanFactory enviroment bean 注册

环境：

SpringBoot: 2.5.5

SpringCore: 5.3.10

配置发起点：

"main@1" prio=5 tid=0x1 nid=NA runnable

java.lang.Thread.State: RUNNABLE
      at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.
      at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.
      at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.
      at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.
      at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.
      at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.
      at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.
      - locked <0xb25> (a
      at org.springframework.boot.SpringApplication.refresh(SpringApplication.
      at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.
      at org.springframework.boot.SpringApplication.run(SpringApplication.
      at org.springframework.boot.SpringApplication.run(SpringApplication.
      at org.springframework.boot.SpringApplication.run(SpringApplication.
      at com.yinyu.demo.DemoApplication.main(DemoApplication.

createApplicationContext =>
new AnnotationConfigApplicationContext()
this.reader = new AnnotatedBeanDefinitionReader(this);
this.scanner = new ClassPathBeanDefinitionScanner(this);

org.springframework.context.annotation.AnnotationConfigApplicationContext.(AnnotationConfigApplicationContext.
at org.springframework.boot.ApplicationContextFactory.lambda$static$0(ApplicationContextFactory.
at org.springframework.boot.SpringApplication.createApplicationContext(SpringApplication.
at org.springframework.boot.SpringApplication.run(SpringApplication.
at com.yinyu.demo.DemoApplication.main(DemoApplication.

prepareContext

applyInitializers(context);
BeanDefinitionLoader loader.load(); // main app class

如下两个方法完成了Spring的扫描注册功能：
reader.register(Class[?]... annotatedClasses);
scanner.scan(String... basePackages);

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