Class: EventMachine::Timers::CronLine

Inherits:
Object
  • Object
show all
Defined in:
lib/em-timers/cron_line.rb

Overview

A ‘cron line’ is a line in the sense of a crontab (man 5 crontab) file line.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(line) ⇒ CronLine

Returns a new instance of CronLine.



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# File 'lib/em-timers/cron_line.rb', line 49

def initialize (line)

  super()

  @original = line

  items = line.split

  unless items.length == 5 or items.length == 6
    raise(
          "cron '#{line}' string should hold 5 or 6 items, not #{items.length}")
  end

  offset = items.length - 5

  @seconds = offset == 1 ? parse_item(items[0], 0, 59) : [ 0 ]
  @minutes = parse_item(items[0 + offset], 0, 59)
  @hours = parse_item(items[1 + offset], 0, 24)
  @days = parse_item(items[2 + offset], 1, 31)
  @months = parse_item(items[3 + offset], 1, 12)
  @weekdays = parse_weekdays(items[4 + offset])
end

Instance Attribute Details

#days ⇒ Object (readonly)

Returns the value of attribute days.



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# File 'lib/em-timers/cron_line.rb', line 41

def days
  @days
end

#hours ⇒ Object (readonly)

Returns the value of attribute hours.



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# File 'lib/em-timers/cron_line.rb', line 41

def hours
  @hours
end

#minutes ⇒ Object (readonly)

Returns the value of attribute minutes.



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# File 'lib/em-timers/cron_line.rb', line 41

def minutes
  @minutes
end

#months ⇒ Object (readonly)

Returns the value of attribute months.



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# File 'lib/em-timers/cron_line.rb', line 41

def months
  @months
end

#original ⇒ Object (readonly)

The string used for creating this cronline instance.



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# File 'lib/em-timers/cron_line.rb', line 39

def original
  @original
end

#seconds ⇒ Object (readonly)

Returns the value of attribute seconds.



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# File 'lib/em-timers/cron_line.rb', line 41

def seconds
  @seconds
end

#weekdays ⇒ Object (readonly)

Returns the value of attribute weekdays.



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# File 'lib/em-timers/cron_line.rb', line 41

def weekdays
  @weekdays
end

Instance Method Details

#matches?(time) ⇒ Boolean

Returns true if the given time matches this cron line.

Returns:

  • (Boolean) 


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# File 'lib/em-timers/cron_line.rb', line 75

def matches? (time)

  time = Time.at(time) unless time.kind_of?(Time)

  return false unless sub_match?(time.sec, @seconds)
  return false unless sub_match?(time.min, @minutes)
  return false unless sub_match?(time.hour, @hours)
  return false unless sub_match?(time.day, @days)
  return false unless sub_match?(time.month, @months)
  return false unless sub_match?(time.wday, @weekdays)
  true
end

#next_time(time = Time.now) ⇒ Object

Returns the next time that this cron line is supposed to ‘fire’

This is raw, 3 secs to iterate over 1 year on my macbook :( brutal.

This method accepts an optional Time parameter. It’s the starting point for the ‘search’. By default, it’s Time.now

Note that the time instance returned will be in the same time zone that the given start point Time (thus a result in the local time zone will be passed if no start time is specified (search start time set to Time.now))

>> EventMachine::Timers::CronLine.new('30 7 * * *').next_time( Time.mktime(2008,10,24,7,29) )
=> Fri Oct 24 07:30:00 -0500 2008

>> EventMachine::Timers::CronLine.new('30 7 * * *').next_time( Time.utc(2008,10,24,7,29) )
=> Fri Oct 24 07:30:00 UTC 2008

>> EventMachine::Timers::CronLine.new('30 7 * * *').next_time( Time.utc(2008,10,24,7,29)  ).localtime
=> Fri Oct 24 02:30:00 -0500 2008

(Thanks to K Liu for the note and the examples)



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# File 'lib/em-timers/cron_line.rb', line 122

def next_time (time=Time.now)

  time -= time.usec * 1e-6
  time += 1

  loop do

    unless date_match?(time)
      time += (24 - time.hour) * 3600 - time.min * 60 - time.sec
      next
    end

    unless sub_match?(time.hour, @hours)
      time += (60 - time.min) * 60 - time.sec
      next
    end

    unless sub_match?(time.min, @minutes)
      time += 60 - time.sec
      next
    end

    unless sub_match?(time.sec, @seconds)
      time += 1
      next
    end

    break
  end

  time
end

#to_array ⇒ Object

Returns an array of 6 arrays (seconds, minutes, hours, days, months, weekdays). This method is used by the cronline unit tests.



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# File 'lib/em-timers/cron_line.rb', line 93

def to_array

  [ @seconds, @minutes, @hours, @days, @months, @weekdays ]
end