prometheus-net

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namespace Prometheus;
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public static class TimerExtensions
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{
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    private sealed class Timer : ITimer
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    {
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        private readonly ValueStopwatch _stopwatch = ValueStopwatch.StartNew();
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        private readonly Action<double> _observeDurationAction;
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        public Timer(IObserver observer)
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        {
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            _observeDurationAction = observer.Observe;
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        }
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        public Timer(IGauge gauge)
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        {
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            _observeDurationAction = gauge.Set;
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        }
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        public Timer(ICounter counter)
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        {
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            _observeDurationAction = counter.Inc;
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        }
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        public TimeSpan ObserveDuration()
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        {
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            var duration = _stopwatch.GetElapsedTime();
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            _observeDurationAction(duration.TotalSeconds);
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            return duration;
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        }
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        public void Dispose()
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        {
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            ObserveDuration();
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        }
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    }
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    /// <summary>
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    /// Enables you to easily report elapsed seconds in the value of an observer.
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    /// Dispose of the returned instance to report the elapsed duration.
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    /// </summary>
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    public static ITimer NewTimer(this IObserver observer)
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    {
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        return new Timer(observer);
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    }
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    /// <summary>
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    /// Enables you to easily report elapsed seconds in the value of a gauge.
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    /// Dispose of the returned instance to report the elapsed duration.
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    /// </summary>
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    public static ITimer NewTimer(this IGauge gauge)
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    {
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        return new Timer(gauge);
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    }
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    /// <summary>
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    /// Enables you to easily report elapsed seconds in the value of a counter.
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    /// The duration (in seconds) will be added to the value of the counter.
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    /// Dispose of the returned instance to report the elapsed duration.
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    /// </summary>
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    public static ITimer NewTimer(this ICounter counter)
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    {
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        return new Timer(counter);
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    }
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}
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