def notify_event(event, tuple)
      ev = [event, tuple]
      @notify_waiter.find_all_template(ev).each do |template|
        template.notify(ev)
      end
    end
def notify_event(event, tuple)
      ev = [event, tuple]
      @notify_waiter.find_all_template(ev).each do |template|
        template.notify(ev)
      end
    end
Notifies all registered listeners for +event+ of a status change of
 +tuple+.