class Rufus::Scheduler::EveryJob

def check_frequency
  fail ArgumentError.new(
   "job frequency (#{@frequency}s) is higher than " +
   "scheduler frequency (#{@scheduler.frequency}s)"
  ) if @frequency < @scheduler.frequency
end

def initialize(scheduler, duration, opts, block)
  super(scheduler, duration, opts, block)
  @frequency = Rufus::Scheduler.parse_in(@original)
  fail ArgumentError.new(
    "cannot schedule #{self.class} with a frequency " +
    "of #{@frequency.inspect} (#{@original.inspect})"
  ) if @frequency <= 0
  set_next_time(nil)
end

def next_time_from(time)
  time + @frequency
end

def set_next_time(trigger_time, is_post=false, now=nil)
  return if is_post
  n = now || EoTime.now
  return @next_time = @first_at \
    if @first_at && (trigger_time == nil || @first_at > n)
  dp = discard_past?
  loop do
    @next_time = (@next_time || n) + @frequency
    break if dp == false
    break if @next_time > n
  end
end