public static IAsyncObservable <TSource> Concat <TSource>(this IEnumerable <IAsyncObservable <TSource> > sources)
{
if (sources == null)
{
throw new ArgumentNullException(nameof(sources));
}
return(Create <TSource>(async observer =>
{
var enumerator = sources.GetEnumerator();
if (!enumerator.MoveNext())
{
return AsyncDisposable.Nop; // REVIEW: Is Never behavior right here?
}
var source = enumerator.Current;
var(sink, inner) = AsyncObserver.Concat(observer, enumerator);
var subscription = await source.SubscribeSafeAsync(sink).ConfigureAwait(false);
return StableCompositeAsyncDisposable.Create(subscription, inner);
}));
}
public static IAsyncObservable <TSource> Concat <TSource>(this IAsyncObservable <TSource> first, IAsyncObservable <TSource> second)
{
if (first == null)
{
throw new ArgumentNullException(nameof(first));
}
if (second == null)
{
throw new ArgumentNullException(nameof(second));
}
return(Create <TSource>(async observer =>
{
var(sink, inner) = AsyncObserver.Concat(observer, second);
var subscription = await first.SubscribeSafeAsync(sink).ConfigureAwait(false);
return StableCompositeAsyncDisposable.Create(subscription, inner);
}));
}
