class Rufus::Scheduler::CronJob

def check_frequency
  return if @scheduler.frequency <= 1
    #
    # The minimum time delta in a cron job is 1 second, so if the
    # scheduler frequency is less than that, no worries.
  f = @cron_line.rough_frequency
  fail ArgumentError.new(
   "job frequency (min ~#{f}s) is higher than " +
   "scheduler frequency (#{@scheduler.frequency}s)"
  ) if f < @scheduler.frequency
end