public void AllTelemetryCapturedWhenProductionRateIsLow()
{
var sentTelemetry = new List<ITelemetry>();
int itemsProduced = 0;
using (var tc = new TelemetryConfiguration() { TelemetryChannel = new StubTelemetryChannel() })
{
var chainBuilder = new TelemetryProcessorChainBuilder(tc);
// set up addaptive sampling that evaluates and changes sampling % frequently
chainBuilder
.UseAdaptiveSampling(
new SamplingPercentageEstimatorSettings()
{
EvaluationInterval = TimeSpan.FromSeconds(1),
SamplingPercentageDecreaseTimeout = TimeSpan.FromSeconds(2),
SamplingPercentageIncreaseTimeout = TimeSpan.FromSeconds(2),
},
this.TraceSamplingPercentageEvaluation)
.Use((next) => new StubTelemetryProcessor(next) { OnProcess = (t) => sentTelemetry.Add(t) });
chainBuilder.Build();
const int productionFrequencyMs = 1000;
using (var productionTimer = new Timer(
(state) => { tc.TelemetryProcessorChain.Process(new RequestTelemetry()); itemsProduced++; },
null,
productionFrequencyMs,
productionFrequencyMs))
{
Thread.Sleep(25000);
}
}
Assert.Equal(itemsProduced, sentTelemetry.Count);
}
public void SamplingPercentageAdjustsAccordingToConstantHighProductionRate()
{
var sentTelemetry = new List<ITelemetry>();
int itemsProduced = 0;
using (var tc = new TelemetryConfiguration() { TelemetryChannel = new StubTelemetryChannel() })
{
var chainBuilder = new TelemetryProcessorChainBuilder(tc);
// set up addaptive sampling that evaluates and changes sampling % frequently
chainBuilder
.UseAdaptiveSampling(
new SamplingPercentageEstimatorSettings()
{
EvaluationInterval = TimeSpan.FromSeconds(1),
SamplingPercentageDecreaseTimeout = TimeSpan.FromSeconds(2),
SamplingPercentageIncreaseTimeout = TimeSpan.FromSeconds(2),
},
this.TraceSamplingPercentageEvaluation)
.Use((next) => new StubTelemetryProcessor(next) { OnProcess = (t) => sentTelemetry.Add(t) });
chainBuilder.Build();
const int productionFrequencyMs = 100;
using (var productionTimer = new Timer(
(state) =>
{
for (int i = 0; i < 2; i++)
{
tc.TelemetryProcessorChain.Process(new RequestTelemetry());
itemsProduced++;
}
},
null,
0,
productionFrequencyMs))
{
Thread.Sleep(25000);
}
}
// number of items produced should be close to target of 5/second
int targetItemCount = 25 * 5;
// tolrance +-
int tolerance = targetItemCount / 2;
Trace.WriteLine(string.Format("'Ideal' telemetry item count: {0}", targetItemCount));
Trace.WriteLine(string.Format(
"Expected range: from {0} to {1}",
targetItemCount - tolerance,
targetItemCount + tolerance));
Trace.WriteLine(string.Format(
"Actual telemetry item count: {0} ({1:##.##}% of ideal)",
sentTelemetry.Count,
100.0 * sentTelemetry.Count / targetItemCount));
Assert.True(sentTelemetry.Count > targetItemCount - tolerance);
Assert.True(sentTelemetry.Count < targetItemCount + tolerance);
}