Class: Dnsync::RecurringZoneUpdater

Inherits:
Object
  • Object
show all
Defined in:
lib/dnsync/recurring_zone_updater.rb

Instance Method Summary collapse

Constructor Details

#initialize(source, destination, frequency, grace_period) ⇒ RecurringZoneUpdater

Returns a new instance of RecurringZoneUpdater.



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# File 'lib/dnsync/recurring_zone_updater.rb', line 6

def initialize(source, destination, frequency, grace_period)
  @source       = source
  @destination  = destination
  @frequency    = frequency.to_i
  @grace_period = grace_period.to_i

  @thread          = Atomic.new(nil)
  @running         = Atomic.new(false)
  @last_updated_at = Atomic.new(nil)
  @last_exception  = Atomic.new(nil)
  @failures        = Atomic.new(0)
end

Instance Method Details

#health_problems ⇒ Object 



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# File 'lib/dnsync/recurring_zone_updater.rb', line 50

def health_problems
  thread    = @thread.value
  running   = @running.value
  updated   = last_updated
  exception = @last_exception.value
  failures  = @failures.value

  problems = []

  unless running
    problems << "Component not running"
  end

  unless thread && thread.alive?
    problems << "Thread not alive"
  end

  unless recently_updated?(updated)
    if updated
      time_description = "in %0.2f seconds (should have been %d seconds)" % [ updated.to_f, @frequency ]
    else
      time_description = "ever"
    end

    problems << "Successful update hasn't occured #{time_description}"
  end

  if exception && failures > @grace_period
    problems << "Last update failed with #{exception.class}: #{exception.message}"
  end

  unless problems.empty?
    problems.join('; ')
  end
end

#healthy? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dnsync/recurring_zone_updater.rb', line 46

def healthy?
  health_problems.blank?
end

#join ⇒ Object 



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# File 'lib/dnsync/recurring_zone_updater.rb', line 38

def join
  if thread = @thread.value
    thread.join
  end

  self
end

#last_updated ⇒ Object 



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# File 'lib/dnsync/recurring_zone_updater.rb', line 91

def last_updated
  if at = @last_updated_at.value
    Time.now.to_f - at.to_f
  end
end

#recently_updated?(updated = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dnsync/recurring_zone_updater.rb', line 86

def recently_updated?(updated = nil)
  updated ||= last_updated
  updated && updated < (@frequency * @grace_period)
end

#start ⇒ Object 



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# File 'lib/dnsync/recurring_zone_updater.rb', line 19

def start
  if (thread = @thread.value) && thread.alive?
    return self
  end

  @running.value         = true
  @last_updated_at.value = Time.now

  @thread.value = Thread.new do
    Thread.current.abort_on_exception = true
    run
  end
end

#stop ⇒ Object 



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# File 'lib/dnsync/recurring_zone_updater.rb', line 33

def stop
  @running.value = false
  self
end