public void BuildSamplingParametersHandlesCurrentActivity()
{
using var activitySource = new ActivitySource(nameof(this.BuildSamplingParametersHandlesCurrentActivity));
var testSampler = new TestSampler {
DesiredSamplingResult = new SamplingResult(true)
};
using var listener = new ActivityListener
{
ShouldListenTo = _ => true,
GetRequestedDataUsingContext = (ref ActivityCreationOptions <ActivityContext> options) =>
Sdk.ComputeActivityDataRequest(options, testSampler),
};
ActivitySource.AddActivityListener(listener);
using (var root = activitySource.StartActivity("root"))
{
Assert.Equal(default(ActivitySpanId), root.ParentSpanId);
// This enforces the current behavior that the traceId passed to the sampler for the
// root span/activity is not the traceId actually used.
Assert.NotEqual(root.TraceId, testSampler.LatestSamplingParameters.TraceId);
}
using (var parent = activitySource.StartActivity("parent", ActivityKind.Client))
{
// This enforces the current behavior that the traceId passed to the sampler for the
// root span/activity is not the traceId actually used.
Assert.NotEqual(parent.TraceId, testSampler.LatestSamplingParameters.TraceId);
using (var child = activitySource.StartActivity("child"))
{
Assert.Equal(parent.TraceId, testSampler.LatestSamplingParameters.TraceId);
Assert.Equal(parent.TraceId, child.TraceId);
Assert.Equal(parent.SpanId, child.ParentSpanId);
}
}
var customContext = new ActivityContext(
ActivityTraceId.CreateRandom(),
ActivitySpanId.CreateRandom(),
ActivityTraceFlags.None);
using (var fromCustomContext =
activitySource.StartActivity("customContext", ActivityKind.Client, customContext))
{
Assert.Equal(customContext.TraceId, fromCustomContext.TraceId);
Assert.Equal(customContext.SpanId, fromCustomContext.ParentSpanId);
Assert.NotEqual(customContext.SpanId, fromCustomContext.SpanId);
}
// Preserve traceId in case span is propagated but not recorded (sampled per OpenTelemetry parlance) and
// no data is requested for children spans.
testSampler.DesiredSamplingResult = new SamplingResult(false);
using (var root = activitySource.StartActivity("root"))
{
Assert.Equal(default(ActivitySpanId), root.ParentSpanId);
using (var child = activitySource.StartActivity("child"))
{
Assert.Null(child);
Assert.Equal(root.TraceId, testSampler.LatestSamplingParameters.TraceId);
Assert.Same(Activity.Current, root);
}
}
}