apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/grayReleaseRule/GrayReleaseRuleCache.java/GrayReleaseRuleCache/compareTo
class GrayReleaseRuleCache:  @Override
  public int compareTo(GrayReleaseRuleCache that) {
    return Long.compare(this.ruleId, that.ruleId);
  }