public ISpanContext Extract(ICarrierReader carrierReader, ICarrier carrier)
{
if (carrierReader == null)
{
throw new ArgumentNullException(nameof(carrierReader));
}
return(carrierReader.Read(carrier));
}
public Task <ISpanContext> ExtractAsync(ICarrierReader carrierReader, ICarrier carrier)
{
return(carrierReader.ReadAsync(carrier));
}
public ISpanContext Extract(ICarrierReader carrierReader, ICarrier carrier)
{
return(new NullSpanContext());
}
public Task <ISpanContext> ExtractAsync(ICarrierReader carrierReader, ICarrier carrier)
{
return(Task.FromResult <ISpanContext>(new NullSpanContext()));
}
