/// <summary>
/// Calls the <see cref="ISpecificAutocollectedMetricsExtractor.ExtractMetrics(ITelemetry, out Boolean)"/> of each participating extractor for the specified item.
/// Catches and logs all errors.
/// If <c>isItemProcessed</c> is True, adds a corresponding marker to the item's properties.
/// </summary>
/// <param name="fromItem">The item from which to extract metrics.</param>
private void ExtractMetrics(ITelemetry fromItem)
{
ISupportSampling potentiallySampledItem = fromItem as ISupportSampling;
if (potentiallySampledItem != null && false == this.EnsureItemNotSampled(potentiallySampledItem))
{
return;
}
for (int e = 0; e < this.extractors.Length; e++)
{
ExtractorWithInfo participant = this.extractors[e];
try
{
bool isItemProcessed;
participant.Extractor.ExtractMetrics(fromItem, out isItemProcessed);
if (isItemProcessed)
{
AddExtractorInfo(fromItem, participant.Info);
}
}
catch (Exception ex)
{
CoreEventSource.Log.LogError("Extraction error in " + participant.Extractor.GetType().Name + ": " + ex.ToString());
}
}
}
private bool EnsureItemNotSampled(ISupportSampling item)
{
if (item.SamplingPercentage.HasValue &&
item.SamplingPercentage.Value < (100.0 - 1.0E-12))
{
if (false == this.isMetricExtractorAfterSamplingLogged)
{
//// benign race
this.isMetricExtractorAfterSamplingLogged = true;
CoreEventSource.Log.MetricExtractorAfterSamplingError();
}
else
{
CoreEventSource.Log.MetricExtractorAfterSamplingVerbose();
}
return(false);
}
return(true);
}
private bool EnsureItemNotSampled(ITelemetry item)
{
ISupportSampling potentiallySampledItem = item as ISupportSampling;
if (potentiallySampledItem != null &&
potentiallySampledItem.SamplingPercentage.HasValue &&
potentiallySampledItem.SamplingPercentage.Value < (100.0 - 1.0E-12))
{
if (!this.isMetricExtractorAfterSamplingLogged)
{
//// benign race
this.isMetricExtractorAfterSamplingLogged = true;
CoreEventSource.Log.MetricExtractorAfterSamplingError();
}
else
{
CoreEventSource.Log.MetricExtractorAfterSamplingVerbose();
}
return(false);
}
return(true);
}
private static void CopySamplingFields(Telemetry inputTelemetry, ISupportSampling telemetry)
{
telemetry.SamplingPercentage = null; // inputTelemetry.SamplingRate?.Value; always sample (if configured), regardless of whether it was sampled previousely on the client
}
private static void CopySamplingFields(Telemetry inputTelemetry, ISupportSampling telemetry)
{
telemetry.SamplingPercentage = inputTelemetry.SamplingRate?.Value ?? 100;
}
