def exchange_names(*names)
      @_exchange_names ||= []
      @_exchange_names += names.flatten.map(&:to_s)

      if @_exchange_names.empty?
        return [ ::ActionSubscriber.config.default_exchange ]
      else
        return @_exchange_names.compact.uniq
      end
    end
def exchange_names(*names)
      @_exchange_names ||= []
      @_exchange_names += names.flatten.map(&:to_s)

      if @_exchange_names.empty?
        return [ ::ActionSubscriber.config.default_exchange ]
      else
        return @_exchange_names.compact.uniq
      end
    end
Explicitly set the name of the exchange