private static AddRangeOnList <TObject, T> _maybeInstance; // cache and reuse or discard
public static void Populate(List <T> list, TObject obj, Containers.GetSpan <TObject, T> getSpan)
{
var listPopulator = Interlocked.Exchange(ref _maybeInstance, null);
if (listPopulator == null)
{
listPopulator = new AddRangeOnList <TObject, T>();
}
listPopulator.obj = obj;
listPopulator.getSpan = getSpan;
list.AddRange(listPopulator);
listPopulator.obj = default;
listPopulator.getSpan = null;
_maybeInstance = listPopulator; // might splat another, might not get flushed in time, but we don't care
}
private static BatchProcessResult TryProcessBatch <T, TObject, T2U>(TObject obj, Containers.GetSpan <TObject, T> getSpan, ref T2U forwardEnumerator, ref bool moreData)
where T2U : IPushEnumerator <T>
{
if (!moreData)
{
return(BatchProcessResult.SuccessAndHalt);
}
var uResult = forwardEnumerator.TryProcessBatch <TObject, Containers.GetSpan <TObject, T> >(obj, getSpan);
if (uResult == BatchProcessResult.SuccessAndHalt)
{
moreData = false;
}
return(uResult);
}
internal static BatchProcessResult ProcessBatch <TElement, TObject, TPushEnumerator1, TPushEnumerator2>(TObject obj, Containers.GetSpan <TObject, TElement> getSpan, ref TPushEnumerator1 t2u, ref bool t2uMoreData, ref TPushEnumerator2 t2v, ref bool t2vMoreData)
where TPushEnumerator1 : IPushEnumerator <TElement>
where TPushEnumerator2 : IPushEnumerator <TElement>
{
var uResult = TryProcessBatch <TElement, TObject, TPushEnumerator1>(obj, getSpan, ref t2u, ref t2uMoreData);
var vResult = TryProcessBatch <TElement, TObject, TPushEnumerator2>(obj, getSpan, ref t2v, ref t2vMoreData);
if (!t2uMoreData && !t2vMoreData)
{
return(BatchProcessResult.SuccessAndHalt);
}
else if (uResult != BatchProcessResult.Unavailable && vResult != BatchProcessResult.Unavailable)
{
return(BatchProcessResult.SuccessAndContinue);
}
var span = getSpan(obj);
if (uResult == BatchProcessResult.Unavailable)
{
t2uMoreData = ProcessSpan(span, ref t2u);
}
if (vResult == BatchProcessResult.Unavailable)
{
t2vMoreData = ProcessSpan(span, ref t2v);
}
if (!t2uMoreData && !t2vMoreData)
{
return(BatchProcessResult.SuccessAndHalt);
}
return(BatchProcessResult.SuccessAndContinue);
}
