Class: Instrumental::Intervalometer

Inherits:
Object
  • Object
show all
Defined in:
lib/instrumental/intervalometer.rb

Instance Method Summary collapse

Constructor Details

#initialize(period = 60.0) ⇒ Intervalometer

Returns a new instance of Intervalometer.



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# File 'lib/instrumental/intervalometer.rb', line 4

def initialize(period=60.0)
  @period = period.to_f
  @running = true
  @run_next = Time.now
end

Instance Method Details

#halt ⇒ Object 



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# File 'lib/instrumental/intervalometer.rb', line 10

def halt
  # TODO: See if it would be possible for the intervalometer to do a
  # final run before the thread exits.
  @running = false
end

#run ⇒ Object

Runs a passed block at intervals defined by the period set during initialization. Uses intervalometer to keep reasonably precise intervals.



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# File 'lib/instrumental/intervalometer.rb', line 18

def run
  while @running
    if Time.now < @run_next
      sleep @run_next - Time.now
    end

    @run_next = Time.now + @period
    yield
  end
end