public Task Add(IList <IClientSpan> spans)
{
if (spans == null || spans.Count == 0)
{
return(0.AsTask());
}
var entities = new List <ClientSpanEntity>();
foreach (var span in spans)
{
var spanEntity = new ClientSpanEntity();
MyModelHelper.SetProperties(spanEntity, span);
entities.Add(spanEntity);
}
var jsonLine = entities.ToJson(false);
var now = spans.Min(x => x.StartUtc);
var archive = DateTimeRangeArchive.Create(now);
var filePath = CreateFilePath(archive.ArchiveId);
return(_asyncFile.AppendAllText(filePath, jsonLine, true));
}