private String toString(RedisConnectionFactory redisConnectionFactory) {
   if (redisConnectionFactory == null) {
     return "<none>";
   } else {
     if (redisConnectionFactory instanceof JedisConnectionFactory) {
       JedisConnectionFactory jcf = (JedisConnectionFactory) redisConnectionFactory;
       return jcf.getHostName().toString() + ":" + jcf.getPort();
     } else if (redisConnectionFactory instanceof LettuceConnectionFactory) {
       LettuceConnectionFactory lcf = (LettuceConnectionFactory) redisConnectionFactory;
       return lcf.getHostName().toString() + ":" + lcf.getPort();
     }
     return "<unknown> " + redisConnectionFactory.getClass();
   }
 }