/// <inheritdoc />
public ISpan Start()
{
if (!startTimestampUtc.HasValue)
{
startTimestampUtc = tracer.CurrentTimestamp();
}
var globalTags = tracer.Tags;
if (globalTags != null && globalTags.Count > 0)
{
tags.AddRange(globalTags);
}
var context = CreateSpanContext();
return(new WavefrontSpan(tracer, operationName, context, startTimestampUtc.Value,
parents, follows, tags));
}
/// <inheritdoc />
public ISpan Start()
{
if (!startTimestampUtc.HasValue)
{
startTimestampUtc = tracer.CurrentTimestamp();
}
var context = CreateSpanContext();
if (!context.IsSampled())
{
// This indicates a root span and that no decision has been inherited from a parent
// span. Perform head based sampling as no sampling decision has been obtained for
// this span yet.
long traceId = Utils.TraceIdToLong(context.GetTraceId());
bool decision = tracer.Sample(operationName, traceId, 0);
context = context.WithSamplingDecision(decision);
}
return(new WavefrontSpan(tracer, operationName, context, startTimestampUtc.Value,
parents, follows, tags));
}