apollo-common/src/main/java/com/ctrip/framework/apollo/common/dto/GrayReleaseRuleDTO.java/GrayReleaseRuleDTO/setRuleItems
class GrayReleaseRuleDTO:  public void setRuleItems(Set<GrayReleaseRuleItemDTO> ruleItems) {
    this.ruleItems = ruleItems;
  }