def start
      self.sort_queues!

      for i in (1..max_threads)
        @threads << Thread.new(i) do
          worker = QueueWorker.new
          worker.delay = @delay
          worker.retry_count = @retry_count
          worker.run
        end
      end
    end
def start
      self.sort_queues!

      for i in (1..max_threads)
        @threads << Thread.new(i) do
          worker = QueueWorker.new
          worker.delay = @delay
          worker.retry_count = @retry_count
          worker.run
        end
      end
    end
Start up queue runners