# File lib_ctrl/rucy/params.rb, line 329
    def messenger_queue_length=(new_len)
      if (new_len == 0) then
        raise "not allowed zero number of messenger queue length: #{new_len.inspect}"
      end
      if (new_len < 0) then
        raise "not allowed negative number of messenger queue length: #{new_len.inspect}"
      end
      @params['messenger_queue_length'] = new_len
    end