Shulou(Shulou.com)06/02 Report--

What is the role of ServiceBeanExportedEvent in dubbo? I believe many inexperienced people don't know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

ServiceBeanExportedEvent

Dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/context/event/ServiceBeanExportedEvent.java

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 inherits ApplicationEvent, and its source is ServiceBean

ServiceBean

Dubbo-2.7.3/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/ServiceBean.java

Public class ServiceBean extends ServiceConfig implements InitializingBean, DisposableBean, ApplicationContextAware, ApplicationListener, 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);} / /.}

The export method of ServiceBean will publishExportEvent

ReferenceAnnotationBeanPostProcessor

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 implements the onApplicationEvent method of ApplicationListener, executes onServiceBeanExportEvent when the ServiceBeanExportedEvent event is received, removes it from localReferenceBeanInvocationHandlerCache, and then executes the init method of ReferenceBeanInvocationHandler

Summary

ServiceBeanExportedEvent inherits ApplicationEvent, and the export method whose source is ServiceBean;ServiceBean publishExportEvent;ReferenceAnnotationBeanPostProcessor implements the onApplicationEvent method of ApplicationListener, executes onServiceBeanExportEvent when the ServiceBeanExportedEvent event is received, here it is removed from localReferenceBeanInvocationHandlerCache, and then executes the init method of ReferenceBeanInvocationHandler

After reading the above, have you mastered the role of ServiceBeanExportedEvent in dubbo? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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