code: public long addAll(final String... members) {
          return doWithJedis(new JedisCallable<Long>() {
              @Override
              public Long call(Jedis jedis) {
                  return jedis.sadd(getKey(), members);
              }
          });
      }
docs: Adds to this set all of the elements in the specified members array
  @param members the members to add
  @return the number of members actually added