def queue(name=nil)
        if name
          @queue_name = name
        else # accessor
          (@queue_name.is_a?(Proc) ? @queue_name.call(self) : @queue_name) || Backburner.configuration.primary_queue
        end
      end
Returns or assigns queue name for this job.

@example
queue "some.task.name"
@klass.queue # => "some.task.name"