记录一次springboot启动流程不完整版

1.Sort ApplicationInitializer:

2.sort Listener:

3.getRunListener:

4.eventPublishingRunListener.starting 发布启动中事件；

构建 ApplicationArguments 参数，

4.1prepareEnvement:

[StubPropertySource {name='servletConfigInitParams'},

StubPropertySource {name='servletContextInitParams'},

PropertiesPropertySource {name='systemProperties'},

SystemEnvironmentPropertySource {name='systemEnvironment'}]

5.eventPublistRunlistener.environmentPrepared （环境变量） 发布环境已经准备好了的事件：

propertySources:[

ConfigurationPropertySourcesPropertySource {name='configurationProperties'},

StubPropertySource {name='servletConfigInitParams'},

StubPropertySource {name='servletContextInitParams'},

PropertiesPropertySource {name='systemProperties'},

SystemEnvironmentPropertySource {name='systemEnvironment'}]

最后返回的environment如下：

[ConfigurationPropertySourcesPropertySource {name='configurationProperties'},

MapPropertySource {name='bootstrap'},

PropertiesPropertySource {name='systemProperties'},

OriginAwareSystemEnvironmentPropertySource {name='systemEnvironment'}, RandomValuePropertySource {name='random'},

MapPropertySource {name='springCloudClientHostInfo'},

OriginTrackedMapPropertySource {name='applicationConfig: [classpath:/bootstrap.yml]'}]

6.创建ConfigurableApplicationContext ,这里只是通过构造函数创建一个基本对象

7.prepareContext 准备容器内容 ，入参（ConfigurableApplicationContext context, ConfigurableEnvironment environment, SpringApplicationRunListeners listeners, ApplicationArguments applicationArguments, Banner printedBanner）

• context.setEnvironment(environment); 容器设置环境信息

• postProcessApplicationContext（ConfigurableApplicationContext context）对容器增强

  • 对AbstractBeanFactory设置beanNameGenerator ,用来生成beanName的
  • 对AbstractBeanFactory设置resourceLoader 加载资源文件的
  • 对AbstractBeanFactory设置类型转换器 ，用来转换不同数据类型或对对象的

• 调用applyInitializers ，对initializer进行调用初始化。

• listeners.contextPrepared(context); 最后又广播出去ApplicationContextInitializedEvent事件

• 从容器中获取 ConfigurableListableBeanFactory

• 向容器中注册springApplicationArguments

• 设置setAllowBeanDefinitionOverriding

• 添加ddBeanFactoryPostProcessor------>LazyInitializationBeanFactoryPostProcessor implements BeanFactoryPostProcessor

• 获取所有source

其中包括BootstrapImportSelectorConfiguration

这里重点是将spring.factories中的BootstrapConfiguration和环境中配置的spring.cloud.bootstrap.sources 进行合并，然后排序，然后返回。。相当于给容器中注入了bean![截屏2024-11-29 00.34.58]

• 执行this.load(context, sources.toArray(new Object[0]))；

 protected void load(ApplicationContext context, Object[] sources) {if (logger.isDebugEnabled()) {logger.debug("Loading source " + StringUtils.arrayToCommaDelimitedString(sources));}BeanDefinitionLoader loader = this.createBeanDefinitionLoader(this.getBeanDefinitionRegistry(context), sources);if (this.beanNameGenerator != null) {loader.setBeanNameGenerator(this.beanNameGenerator);}if (this.resourceLoader != null) {loader.setResourceLoader(this.resourceLoader);}if (this.environment != null) {loader.setEnvironment(this.environment);}loader.load();}

private int load(Object source) {Assert.notNull(source, "Source must not be null");if (source instanceof Class) {return this.load((Class)source);} else if (source instanceof Resource) {return this.load((Resource)source);} else if (source instanceof Package) {return this.load((Package)source);} else if (source instanceof CharSequence) {return this.load((CharSequence)source);} else {throw new IllegalArgumentException("Invalid source type " + source.getClass());}}

根据不同的类型进行load，其中包括Class的register、Package 的scan 、Resource的loadBeanDefinitions；总之重写了很多的类型。

• listeners.contextLoaded(context);告诉监听器容器已经启动完成了。

DefaultListableBeanFactory