springboot的run思路图
2024-04-29 14:39:06 0 举报AI智能生成
spring启动的源码分析
作者其他创作
大纲/内容
SpringApplication.run
prepareContext
load->createBeanDefinitionLoader
AnnotatedBeanDefinitionReader
AnnotationConfigUtils.registerAnnotationConfigProcessor<br>初始化内置的BeanPostProcessor
ConfigurationClassPostProcessor<br>实现了BeanDefinitionRegistryPostProcessor,会最先加载
AutowiredAnnotationBeanPostProcessor
CommonAnnotationBeanPostProcessor
PersistenceAnnotationBeanPostProcessor
EventListenerMethodProcessor
DefaultEventListenerFactory
XmlBeanDefinitionReader
用于加载xml中定义的bean
ClassPathBeanDefinitionScanner
自定义扫描包下的类,手动注入bean
refreshContext
AbstractApplicationContext.refresh
prepareBeanFactory
工厂bean属性赋值,重点是添加了ApplicationContextAwareProcessor
postProcessBeanFactory
空方法,可继承用于扩展
invokeBeanFactoryPostProcessors
加载内置的BeanDefinitionRegistryPostProcessor
加载内置的BeanFactoryPostProcessor
PropertySourcesPlaceholderConfigurer
针对当前 Spring Environment及其PropertySources集解析 bean 定义属性值<br>和@Value注释中的 ${...} 占位符。<br>
1.加载自定义的BeanDefinitionRegistryPostProcessor
invokeBeanDefinitionRegistryPostProcessors调用postProcessBeanDefinitionRegistry
invokeBeanFactoryPostProcessors调用postProcessBeanFactory
2.加载自定义的BeanFactoryPostProcessor
invokeBeanFactoryPostProcessors调用postProcessBeanFactory
registerBeanPostProcessors
1.priorityOrderedPostProcessors(不包含MergedBeanDefinitionPostProcessor类型)
2.orderedPostProcessors(不包含MergedBeanDefinitionPostProcessor类型)
3.nonOrderedPostProcessors(不包含MergedBeanDefinitionPostProcessor类型)
4.internalPostProcessors(就是MergedBeanDefinitionPostProcessor类型)
initApplicationEventMulticaster
registerListeners
finishBeanFactoryInitialization
DefaultListableBeanFactory.preInstantiateSingletons
0.判断是否实现FactoryBean
FactoryBean
按照普通bean的方式创建bean
通过BeanFactory.getBean获取有区别
直接获取getObjectForBeanInstance
getBean("&"+beanName)的方式<br>判断是FactoryBean后获取之前bean实例化的原始Bean<br>
getBean(beanName)会调用getObjectFromFactoryBean<br>然后调用实现类的getObject方法,并将返回的实例放到<br>factoryBeanObjectCache,方便下次调用<br>
普通的Bean
1.AbstractBeanFactory
getBean
doGetBean
getSingleton(beanName,createBean)
AbstractAutowireCapableBeanFactory.createBean
1.resolveBeforeInstantiation
判断hasInstantiationAwareBeanPostProcessors()<br>是否实现InstantiationAwareBeanPostProcessor<br>
2.doCreateBean
createBeanInstance实例化
applyMergedBeanDefinitionPostProcessors
AutowiredAnnotationBeanPostProcessor.postProcessMergedBeanDefinition
CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition<br><font color="#f44336">此处加载的@PostConstruct,不调用</font>
populateBean属性赋值
判断hasInstantiationAwareBeanPostProcessors()<br>是否实现InstantiationAwareBeanPostProcessor<br><font color="#d32f2f">调用postProcessAfterInstantiation 如果返回false直接返回,不进行属性填充</font>
实现InstantiationAwareBeanPostProcessor<br><font color="#d32f2f">调用postProcessAfterInstantiation 如果返回true<br></font><font color="#e65100">调用postProcessProperties自定义属性填充</font>
没实现InstantiationAwareBeanPostProcessor 正常填充属性
initializeBean初始化
invokeAwareMethods
BeanNameAware<br><font color="#f44336">调用setBeanName</font>
BeanClassLoaderAware<br><font color="#f44336">调用setBeanClassLoader</font>
BeanFactoryAware<br><font color="#f44336">调用setBeanFactory</font>
applyBeanPostProcessorsBeforeInitialization<br><font color="#f44336">调用BeanPostProcessor的postProcessBeforeInitialization</font>
其中一个spring内置的BeanPostProcessor<br><font color="#f44336">ApplicationContextAwareProcessor</font><br>
EnvironmentAware
EmbeddedValueResolverAware
ResourceLoaderAware
ApplicationEventPublisherAware
MessageSourceAware
ApplicationStartupAware
<font color="#d32f2f">ApplicationContextAware</font>
invokeInitMethods
<font color="#f44336">调用实现了InitializingBean的afterPropertiesSet</font>
<font color="#f44336">调用Bean的initMethod</font>
applyBeanPostProcessorsAfterInitialization<br><font color="#f44336">调用BeanPostProcessor的postProcessAfterInitialization</font><br>
2.DefaultListableBeanFactory
SmartInitializingSingleton<br>getBean之后循环所有的bean<br><font color="#f44336">调用实现了SmartInitializingSingleton的afterSingletonsInstantiated</font>
finishRefresh
<pre style="font-family: "JetBrains Mono"; font-size: 9.8pt;"><font color="#f44336">publishEvent(new ContextRefreshedEvent(this))<br>发布事件,可以在此处监听,用于bean创建完成之后的扩展</font></pre>
afterRefresh
空方法,可继承用于扩展
listeners.started(context)
可以扩展SpringApplicationRunListener<br>不常用
callRunners
ApplicationRunner
CommandLineRunner
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