package cn.home1.cloud.netflix.eureka.server;
   
   import com.netflix.appinfo.InstanceInfo;
   
   import org.aspectj.lang.ProceedingJoinPoint;
   import org.aspectj.lang.annotation.Around;
   import org.aspectj.lang.annotation.Aspect;
   import org.springframework.beans.factory.annotation.Value;
   import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.util.StringUtils;
  
  /**
   * see: https://stackoverflow.com/questions/42296407/spring-cloud-discovery-for-multiple-service-versions
   */
  @Configuration
  @Aspect
  public class EurekaDashboardLabeler {
  
      private static EurekaDashboardLabeler instance = new EurekaDashboardLabeler();
      @Value("${eureka.instance.metadata.keys.instance-group:instance-group}")
      private String instanceGroupKey;
  
      /**
       * Singleton pattern used by LTW then Spring
       */
      public static EurekaDashboardLabeler aspectOf() {
          return instance;
      }
  
      @Around("execution(public * com.netflix.appinfo.InstanceInfo.getId())")
      public String versionLabelAppInstances(final ProceedingJoinPoint jp) throws Throwable {
          final String instanceId = (String) jp.proceed();
          for (final StackTraceElement ste : Thread.currentThread().getStackTrace()) {
              // limit to EurekaController#populateApps in order to avoid side effects
              if (ste.getClassName().contains("EurekaController")) {
                  final InstanceInfo info = (InstanceInfo) jp.getThis();
                  final String instanceGroup = info.getMetadata().get(this.instanceGroupKey);
                  if (StringUtils.hasText(instanceGroup)) {
                      return String.format("%s [%s]", instanceId, instanceGroup);
                  }
                  break;
              }
          }
          return instanceId;
      }
  
      @Bean("post-construct-labeler")
      public EurekaDashboardLabeler init() {
          return EurekaDashboardLabeler.aspectOf();
      }
  }