Spring 源码
2024-01-24 20:07:49 1 举报AI智能生成
Spring 源码是 Java 平台下的一个开源框架，提供了一种简单的方法来开发企业级应用程序。它的主要特点是依赖注入和面向切面编程。Spring 源码采用分层架构设计，包括核心容器、数据访问/集成、Web、AOP（面向切面编程）、工具、消息和测试模块。Spring 源码中包含了大量的设计模式，如单例模式、工厂模式、代理模式等，使得代码更加简洁、易于维护。此外，Spring 源码还提供了丰富的扩展机制，可以通过自定义 bean、拦截器等来实现个性化需求。总之，Spring 源码是一个功能强大、灵活性高的企业级应用程序开发框架。
作者其他创作
大纲/内容
Spring官网
Spring基础
分支主题
Spring核心 IOC实现
准备工作
1.注册内置PostProcess
this.reader = new AnnotatedBeanDefinitionReader(this);
internalConfigurationAnnotationProcessor<br>ConfigurationClassPostProcessor.class<br>
internalEventListenerFactory<br>DefaultEventListenerFactory<br>
internalEventListenerProcessor<br>EventListenerMethodProcessor<br>
internalAutowiredAnnotationProcessor<br>AutowiredAnnotationBeanPostProcessor<br>
internalCommonAnnotationProcessor<br>CommonAnnotationBeanPostProcessor
internalRequiredAnnotationProcessor(已过期)<br>RequiredAnnotationBeanPostProcessor<br>
AnnotationAwareOrderComparator
ContextAnnotationAutowireCandidateResolver
2.注册扫描器
this.scanner = new ClassPathBeanDefinitionScanner
3.注册配置类
register(annotatedClasses);
监听器
创建事件多播器
initApplicationEventMulticaster()
<ul><li>new <i><font color="#4caf50">SimpleApplicationEventMulticaster</font></i>(beanFactory)</li></ul>
beanFactory.registerSingleton(APPLICATION_EVENT_MULTICASTER_BEAN_NAME, this.applicationEventMulticaster);
ApplicationListener接口的监听器解析过程
refresh->registerListeners<br>将监听器的<font color="#f44336">名字</font>添加到多播器中：applicationListnerBeans
这里思考一个问题：<br>为什么registerListeners注册了一遍监听器<br>在BeanPostProcerssor中又添加一次呢？<br>
答案：为了懒加载的漏网之鱼
在prepareBeanFactory中注册了BeanPostProcessor
在初始化后的BeanPostProcerssor中调用<br><font color="#d32f2f">ApplicationListenerDetector</font><br>将监听器添加到多播器中：applicationListeners<br>
add
<font color="#388e3c">AbstractApplicationContext</font>#<br>applicationListeners<br>
@EventListener事件的解析过程
在创世纪Bean定义中注册了2个关于解析@EventListener
调用<br><font color="#388e3c">EventListenerMethodProcessor.</font>afterSingletonsInstantiated<br>处理@EventListner<br>
add<br>ApplicationListenerMethodAdapter<br>
<font color="#388e3c">AbstractApplicationContext</font>#<br>applicationListeners
PublishEnent
<font color="#388e3c">SimpleApplicationEventMulticaster</font><br>multiCastEnent
接口
ApplicationListener.onApplicationEvent
onApplicationEnent
直接调用
注解
ApplicationListener.onApplicationEvent
ApplicationListenerMethodAdapter<br>onApplicationEvent
通过反射调用
解析BeanDefinition
invokeBeanFactoryPostProcess
注册beanPostProcessor
refresh()
registerBeanProcessors
AbstractBeanFactory.addBeanPostProcessor
invokeBeanFactoryPostProcessors
ImportAwareBeanPostProcessor
BeanPostProcessorChecker
AutowiredAnnotationBeanPostProcessor
RequiredAnnotationBeanPostProcessor
CommonAnnotationBeanPostProcessor
类图
方法
bean后置处理器9处调用
注册bean创建过程
refresh()
finishBeanFactoryInitialization()
preInstantiateSingletons
getBean
doGetBean()
实例化
属性注入
循环依赖
初始化
Spring AOP实现
@EnableAspectJAutoProxy
AspectJAutoProxyRegistrar<br>#registerBeanDefinitions<br>
AopConfigUtils<br>#registerAspectJAnnotationAutoProxyCreatorIfNecessary<br>
AopConfigUtils<br>#registerOrEscalateApcAsRequired<br>
AnnotationAwareAspectJAutoProxyCreator
关系结构图
AbstractAutoProxyCreator
InstantiationAwareBeanPostProcessor
postProcessBeforeInstantiation
BeanPostProcess
postProcessAfterInitialization
SmartInstantiationAwareBeanPostProcessor
getEarlyBeanReference
bean后置处理器9次调用
注册BeanPostProcessors
refresh()
registerBeanPostProcessors
registerBeanPostProcessors
AbstractBeanFactory.addBeanPostProcessor
internalAutoProxyCreator<br>AnnotationAwareAspectJAutoProxyCreator<br>
解析切面(缓存通知)
createBean
resolveBeforeInstantiation
<font color="#388e3c">AbstractAutoProxyCreator</font><br>postProcessBeforeInstantiation<br>
创建代理
doCreateBean
initalizeBean
applyBeanPostProcessorsAfterInitialization
<font color="#388e3c">AbstractAutoProxyCreator</font><br>postProcessAfterInitialization<br>
调用代理
JdkDynamicAopProxy为例
Spring 事务实现
@EnableTransactionManagement
TransactionManagementConfigurationSlector
AutoProxyRegistrar
internalAutoProxyCreator<br>InfrastructureAdvisorAutoProxyCreator<br>
关系结构图
AbstractAutoProxyCreator
InstantiationAwareBeanPostProcessor
postProcessBeforeInstantiation
SmartInstantiationAwareBeanPostProcessor
getEarlyBeanReference
BeanPostProcess
postProcessAfterInitialization
ProxyTransactionManagementConfiguration
beanName:internalTransactionAdvisor<br>beanClass:BeanFactoryTransactionAttributeSourceAdvisor<br>
TransactionAttributeSource
TransactionInterceptor
注册BeanPostProcessors
refresh()
registerBeanPostProcessors
registerBeanPostProcessors
AbstractBeanFactory.addBeanPostProcessor
internalAutoProxyCreator<br>AnnotationAwareAspectJAutoProxyCreator<br>
关键方法
bean的后置处理器9处调用
解析切面（缓存通知）
createBean
resolveBeforeInstantiation
<font color="#4caf50">AbstractAutoProxyCreator</font><br>postProcessBeforeInstantiation<br>
事务切面解析
创建代理
doCreateBean
initializeBean
applyBeanPostProcessorsAfterInitialization
AbstractAutoProxyCreator<br>postProcessAfterInitialization<br>
创建事务动态代理
调用代理
JdkDynamicAopProxy为例
Spring5 新特性
JDK版本升级
spring-webflux
Kotlin函数式编程
spring-jcl
支持Junit 5
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