code: public long length() {
          return doWithJedis(new JedisCallable<Long>() {
              @Override
              public Long call(Jedis jedis) {
                  return jedis.llen(getKey());
              }
          });
      }
docs: Get the length of the list (i.e. the number of elements).<br>
  This is similar to {@link #size()} but is preferred since redis' capacity supports long typed values
  @return the number of elements in the list