Spring Event

EventObject（JDK的类）

# source：Object（ transient ）

+ EventObject(Object source)+ getSource()：Object

ApplicationEvent

+ ApplicationEvent(Object source)

ContextRefreshedEvent

+ ContextRefreshedEvent(Object source)

ApplicationEventMulticaster

+ addApplicationListener(ApplicationListener<?> listener)+ removeApplicationListener(ApplicationListener<?> listener)+ multicastEvent(ApplicationEvent event)

ApplicationEventPublisher

+ publishEvent(ApplicationEvent event)

事件定义者，规范事件接口，定义事件类型，默认定义了 ContextClosedEvent（上下文关闭事件，用于程序结束时的回调通知），ContextRefreshedEvent（上下文刷新事件，用于Spring对所有Bean生成完毕后进行事件通知）

ApplicationContextEvent

+ ApplicationContextEvent(Object source)+ getApplicationContext()：ApplicationContext

ApplicationListener

+ onApplicationEvent(E event)

AbstractApplicationContext

+ APPLICATION_EVENT_MULTICASTER_BEAN_NAME：String- applicationEventMulticaster：ApplicationEventMulticaster

- initApplicationEventMulticaster()- finishRefresh()+ publishEvent(ApplicationEvent event)+ close()

ContextClosedEvent

+ ContextClosedEvent(Object source)

依赖

EventListener（JDK的类）

AbstractApplicationEventMulticaster

+ applicationListeners：Set<ApplicationListener<ApplicationEvent>>

事件监听者，所有监听器要实现ApplicationListener接口