/// <summary>
/// Initializes a new instance of the <see cref="SamplingPercentageEstimatorTelemetryProcessor"/> class.
/// <param name="settings">Dynamic sampling estimator settings.</param>
/// <param name="callback">Callback to invoke every time sampling percentage is evaluated.</param>
/// <param name="next">Next TelemetryProcessor in call chain.</param>
/// </summary>
public SamplingPercentageEstimatorTelemetryProcessor(
Channel.Implementation.SamplingPercentageEstimatorSettings settings,
Channel.Implementation.AdaptiveSamplingPercentageEvaluatedCallback callback,
ITelemetryProcessor next)
{
if (settings == null)
{
throw new ArgumentNullException(nameof(settings));
}
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
this.evaluationCallback = callback;
this.settings = settings;
this.next = next;
this.currenSamplingRate = settings.EffectiveInitialSamplingRate;
this.itemCount = new ExponentialMovingAverageCounter(settings.EffectiveMovingAverageRatio);
this.samplingPercentageLastChangeDateTime = DateTimeOffset.UtcNow;
// set evaluation interval to default value if it is negative or zero
this.evaluationInterval = this.settings.EffectiveEvaluationInterval;
// set up timer to run math to estimate sampling percentage
this.evaluationTimer = new Timer(
this.EstimateSamplingPercentage,
null,
this.evaluationInterval,
this.evaluationInterval);
}
/// <summary>
/// Initializes a new instance of the <see cref="AdaptiveSamplingTelemetryProcessor"/> class.
/// <param name="settings">Sampling percentage estimator settings.</param>
/// <param name="callback">Callback invoked every time sampling percentage is evaluated.</param>
/// <param name="next">Next TelemetryProcessor in call chain.</param>
/// </summary>
public AdaptiveSamplingTelemetryProcessor(
Channel.Implementation.SamplingPercentageEstimatorSettings settings,
Channel.Implementation.AdaptiveSamplingPercentageEvaluatedCallback callback,
ITelemetryProcessor next)
{
this.estimatorSettings = settings;
this.evaluationCallback = callback;
// make estimator telemetry processor work after sampling was done
this.estimatorProcessor = new SamplingPercentageEstimatorTelemetryProcessor(settings, this.SamplingPercentageChanged, next);
this.samplingProcessor = new SamplingTelemetryProcessor(next, this.estimatorProcessor);
}