code: public static Single<Long> addAll(CacheConfigBean cacheConfigBean, String key, Set members) {
          return SingleRxXian.call(CacheService.CACHE_SERVICE, "cacheSetAdd", new JSONObject() {{
              put("cacheConfig", cacheConfigBean);
              put("key", key);
              put("members", members);
          }}).map(unitResponseObject -> {
              unitResponseObject.throwExceptionIfNotSuccess();
              if (unitResponseObject.getData() == null)
                  return 0L;
              return unitResponseObject.dataToLong();
          });
      }
docs: add all the given elements into the set
  
  @param cacheConfigBean the cache datasource configuration
  @param key             key
  @param members         elements to be added
  @return the added elements count