private IEnumerator PreloadCore(int preloadCount, int threshold, IObserver <Unit> observer, CancellationToken cancellationToken)
{
while (Count < preloadCount && !cancellationToken.IsCancellationRequested)
{
int requireCount = preloadCount - Count;
if (requireCount <= 0)
{
break;
}
int createCount = Math.Min(requireCount, threshold);
UniRx.IObservable <Unit>[] loaders = new UniRx.IObservable <Unit> [createCount];
for (int i = 0; i < createCount; i++)
{
UniRx.IObservable <T> source = CreateInstanceAsync();
loaders[i] = source.ForEachAsync(delegate(T x)
{
Return(x);
});
}
ObservableYieldInstruction <Unit> awaiter = Observable.WhenAll(loaders).ToYieldInstruction(throwOnError: false, cancellationToken);
while (!awaiter.HasResult && !awaiter.IsCanceled && !awaiter.HasError)
{
yield return(null);
}
if (awaiter.HasError)
{
observer.OnError(awaiter.Error);
yield break;
}
if (awaiter.IsCanceled)
{
yield break;
}
}
observer.OnNext(Unit.Default);
observer.OnCompleted();
}
