code: function addQueue($channel, $queue, $weight = 1)
      {
          $orig    = $channel;
          $channel = $this->_normalizeQueueName($channel);
  
  
          if (! $queue instanceof iQueueDriver)
              throw new \Exception(sprintf(
                  'Queue must be instance of iQueueDriver; given: (%s).'
                  , \Poirot\Std\flatten($queue)
              ));
  
          if ( isset($this->channels_queue[$channel]) )
              throw new \RuntimeException(sprintf(
                  'Channel (%s) is currently filled with (%s) and is not empty.'
                  , $orig , get_class( $this->channels_queue[$channel] )
              ));
  
  
          $this->channels_queue[$channel]  = $queue;
          $this->channels_weight[$channel] = $weight;
          return $this;
      }
docs: Add Queue For Specified Channel
  
  @param string       $channel
  @param iQueueDriver $queue
  @param int          $weight
  
  @return $this
  @throws \Exception