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2024-03-14 16:06:14   0  举报

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Spring笔记

Spring官网

作者：青水

Spring IOC 核心实现

准备工作

1. 注册内置的PostProcessor

this.reader = new AnnotatedBeanDefinitionReader(this)

internalConfigurationAnnotationProcessor  ConfigurationClassPostProcessor

internalAutowiredAnnotationProcessor     AutowiredAnnotationBeanPostProcessor

internalCommonAnnotationProcessor        CommonAnnotationBeanPostProcessor

internalRequiredAnnotationProcessor        RequiredAnnotationBeanPostProcessor

AnnotationAwareOrderComparator

ContextAnnotationAutowireCandidateResolver

internalEventListenerFactory    DefaultEventListenerFactory

internalEventListenerProcessorEventListenerMethodProcessor

2. 注册扫描器

this.scanner = new ClassPathBeanDefinitionScanner(this)

3. 注册配置类

refresh()

链接

执行BeanFactoryPostProcessor

解析BeanDefinition

invokeBeanFactoryPostProcessors(beanFactory)

eg：ConfigurationClassPostProcessor

注册BeanPostProcessor

refresh()      registerBeanPostProcessors

AbstractBeanFactory.addBeanPostProcessor

invokeBeanFactoryPostProcessors

BeanPostProcessorChecker

AutowiredAnnotationBeanPostProcessor

RequiredAnnotationBeanPostProcessor

CommonAnnotationBeanPostProcessor

bean后置处理器的9处调用(bean创建过程流程图里面有逻辑)

Bean创建过程

refresh()

finishBeanFactoryInitialization(beanFactory)

DefaultListableBeanFactory#preInstantiateSingletons

getBean()

doGetbean()

实例化

属性注入

注入时出现循环依赖

初始化

监听器

创建事件多播器

initApplicationEventMulticaster()

new SimpleApplicationEventMulticaster(beanFactory)

beanFactory.registerSingleton(APPLICATION_EVENT_MULTICASTER_BEAN_NAME, this.applicationEventMulticaster);

ApplicationListener接口的监听器解析过程

refresh() -> registerListeners

这里思考一个问题：为什么registerListeners注册了一遍监听器在，BeanPostProcerssor中又添加一次呢？

答案：为了懒加载的漏网之鱼！

注册ApplicationListenerDetector 这个BeanPostProcessor进行监听

@EventListener注解的解析过程

AnnotatedBeanDefinitionReader创建时注册bean

调用 EventListenerMethodProcessor#afterSingletonsInstantiated来处理 @EventListener注解

ApplicationContext.addApplicationListener(applicationListener)

publishEvent

入口 SimpleApplicationEventMulticaster#multicastEvent

实现ApplicationListener 接口

直接调用

ApplicationListener#onApplicationEvent 具体事件

注解@EventListener的方式

代理调用

ApplicationListenerMethodAdapter#onApplicationEvent

反射调用

this.method.invoke(bean, args)

Spring AOP 实现

注册自动代理功能

@EnableAspectJAutoProxy

AspectJAutoProxyRegistrar#registerBeanDefinitions

AopConfigUtils#registerAspectJAnnotationAutoProxyCreatorIfNecessary(BeanDefinitionRegistry)

关系结构图

AbstractAutoProxyCreator

InstantiationAwareBeanPostProcessor

postProcessBeforeInstantiation

BeanPostProcessor

postProcessAfterInitialization

SmartInstantiationAwareBeanPostProcessor

getEarlyBeanReference

AOP代理后置处理器的9处调用

注册自动代理后置处理器

注册后置处理(AnnotationAwareAspectJAutoProxyCreator)

AbstractApplicationContext#registerBeanPostProcessors

ConfigurableBeanFactory#addBeanPostProcessor

org.springframework.aop.config.internalAutoProxyCreatorAnnotationAwareAspectJAutoProxyCreator

关键方法

解析切面

doCreateBean

AbstractAutowireCapableBeanFactory#resolveBeforeInstantiation

InstantiationAwareBeanPostProcessor#postProcessBeforeInstantiation

AbstractAutoProxyCreator         #postProcessBeforeInstantiation

对bean创建动态代理

doCreateBean

AbstractAutowireCapableBeanFactory#initializeBean

BeanPostProcessor                    #postProcessAfterInitialization

AbstractAutoProxyCreator         #postProcessAfterInitialization

SmartInstantiationAwareBeanPostProcessor#getEarlyBeanReference

AbstractAutoProxyCreator   #getEarlyBeanReference

执行动态代理

org.springframework.aop.framework.AopProxy

org.springframework.aop.framework.JdkDynamicAopProxy

org.springframework.aop.framework.CglibAopProxy

Spring 事务实现

@EnableTransactionManagement

注册Selector   TransactionManagementConfigurationSelector

AutoProxyRegistrar

org.springframework.aop.config.internalAutoProxyCreator

类结构

和 @EnableAspectJAutoProxy的关系

AbstractAutoProxyCreator  同上AOP逻辑

InstantiationAwareBeanPostProcessor

postProcessBeforeInstantiation

BeanPostProcessor

postProcessAfterInitialization

SmartInstantiationAwareBeanPostProcessor

getEarlyBeanReference

@Configuration配置类    ProxyTransactionManagementConfiguration

org.springframework.transaction.config.internalTransactionAdvisor

TransactionAttributeSource

TransactionInterceptor

解析切面(同上AOP)

事务切面解析

创建动态代理(同上AOP)

创建事务的动态代理

调用动态代理(同上AOP)

调用事务的实现

Spring 事务实现

@EnableTransactionManagement

注册Selector TransactionManagementConfigurationSelector

AutoProxyRegistrar

org.springframework.aop.config.internalAutoProxyCreator

类结构

和 @EnableAspectJAutoProxy的关系

AbstractAutoProxyCreator 同上AOP逻辑

InstantiationAwareBeanPostProcessor

postProcessBeforeInstantiation

BeanPostProcessor

postProcessAfterInitialization

SmartInstantiationAwareBeanPostProcessor

getEarlyBeanReference

@Configuration配置类 ProxyTransactionManagementConfiguration

org.springframework.transaction.config.internalTransactionAdvisor

TransactionAttributeSource

TransactionInterceptor

解析切面(同上AOP)

事务切面解析

创建动态代理(同上AOP)

创建事务的动态代理

调用动态代理(同上AOP)

调用事务的实现

Spring5新特性

JDK版本升级

spring-webflux

Kotlin函数式编程

spring-jcl

支持junit5

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