Class: DDMetrics::Stopwatch

Inherits:
Object
  • Object
show all
Defined in:
lib/ddmetrics/stopwatch.rb

Defined Under Namespace

Classes: AlreadyRunningError, NotRunningError, StillRunningError

Constant Summary collapse

NANOS_PER_SECOND = 
1_000_000_000

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Stopwatch

Returns a new instance of Stopwatch.



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# File 'lib/ddmetrics/stopwatch.rb', line 25

def initialize
  @duration = 0
  @last_start = nil
end

Instance Method Details

#duration ⇒ Object

Raises:



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# File 'lib/ddmetrics/stopwatch.rb', line 50

def duration
  raise StillRunningError if running?

  @duration.to_f / NANOS_PER_SECOND
end

#run ⇒ Object 



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# File 'lib/ddmetrics/stopwatch.rb', line 30

def run
  start
  yield
ensure
  stop
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ddmetrics/stopwatch.rb', line 56

def running?
  !@last_start.nil?
end

#start ⇒ Object

Raises:



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# File 'lib/ddmetrics/stopwatch.rb', line 37

def start
  raise AlreadyRunningError if running?

  @last_start = nanos_now
end

#stop ⇒ Object

Raises:



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# File 'lib/ddmetrics/stopwatch.rb', line 43

def stop
  raise NotRunningError unless running?

  @duration += (nanos_now - @last_start)
  @last_start = nil
end

#stopped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ddmetrics/stopwatch.rb', line 60

def stopped?
  !running?
end