apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/eureka/ApolloEurekaClientConfig.java/ApolloEurekaClientConfig/listenApplicationReadyEvent
class ApolloEurekaClientConfig:  @EventListener
  public void listenApplicationReadyEvent(ApplicationReadyEvent event) {
    this.refreshEurekaClient();
  }