public Metadata GetMetadata(Guid consumerId, [Required] string token, string topic,
[Required][Range(0, int.MaxValue)] int timeout)
{
return(topic == null
? _service.GetMetadata(consumerId, token, TimeSpan.FromMilliseconds(timeout))
: _service.GetMetadata(consumerId, token, topic, TimeSpan.FromMilliseconds(timeout)));
}