dubbo中ServiceBeanExportedEvent的作用是什么，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/context/event/ServiceBeanExportedEvent.java
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public class ServiceBeanExportedEvent extends ApplicationEvent {
/**
* Create a new ApplicationEvent.
*
* @param serviceBean {@link ServiceBean} bean
*/
public ServiceBeanExportedEvent(ServiceBean serviceBean) {
super(serviceBean);
}
/**
* Get {@link ServiceBean} instance
*
* @return non-null
*/
public ServiceBean getServiceBean() {
return (ServiceBean) super.getSource();
}
}ServiceBeanExportedEvent继承了ApplicationEvent，其source为ServiceBean
dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/ServiceBean.java
public class ServiceBean<T> extends ServiceConfig<T> implements InitializingBean, DisposableBean,
ApplicationContextAware, ApplicationListener<ContextRefreshedEvent>, BeanNameAware,
ApplicationEventPublisherAware {
//......
/**
* @since 2.6.5
*/
@Override
public void export() {
super.export();
// Publish ServiceBeanExportedEvent
publishExportEvent();
}
/**
* @since 2.6.5
*/
private void publishExportEvent() {
ServiceBeanExportedEvent exportEvent = new ServiceBeanExportedEvent(this);
applicationEventPublisher.publishEvent(exportEvent);
}
//......
}ServiceBean的export方法会publishExportEvent
dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/beans/factory/annotation/ReferenceAnnotationBeanPostProcessor.java
public class ReferenceAnnotationBeanPostProcessor extends AnnotationInjectedBeanPostProcessor implements
ApplicationContextAware, ApplicationListener {
//......
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (event instanceof ServiceBeanExportedEvent) {
onServiceBeanExportEvent((ServiceBeanExportedEvent) event);
} else if (event instanceof ContextRefreshedEvent) {
onContextRefreshedEvent((ContextRefreshedEvent) event);
}
}
private void onServiceBeanExportEvent(ServiceBeanExportedEvent event) {
ServiceBean serviceBean = event.getServiceBean();
initReferenceBeanInvocationHandler(serviceBean);
}
private void initReferenceBeanInvocationHandler(ServiceBean serviceBean) {
String serviceBeanName = serviceBean.getBeanName();
// Remove ServiceBean when it's exported
ReferenceBeanInvocationHandler handler = localReferenceBeanInvocationHandlerCache.remove(serviceBeanName);
// Initialize
if (handler != null) {
handler.init();
}
}
//......
}ReferenceAnnotationBeanPostProcessor实现了ApplicationListener的onApplicationEvent方法，接收到ServiceBeanExportedEvent事件时执行onServiceBeanExportEvent，这里从localReferenceBeanInvocationHandlerCache移除，然后执行ReferenceBeanInvocationHandler的init方法
ServiceBeanExportedEvent继承了ApplicationEvent，其source为ServiceBean；ServiceBean的export方法会publishExportEvent；ReferenceAnnotationBeanPostProcessor实现了ApplicationListener的onApplicationEvent方法，接收到ServiceBeanExportedEvent事件时执行onServiceBeanExportEvent，这里从localReferenceBeanInvocationHandlerCache移除，然后执行ReferenceBeanInvocationHandler的init方法
看完上述内容，你们掌握dubbo中ServiceBeanExportedEvent的作用是什么的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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原文链接：https://my.oschina.net/go4it/blog/3098012
