I am using Rx.NET library and its method Buffer in the most simple manner like:
observable.Buffer(TimeSpan.FromSeconds(5), 10);
It works great except the case when cancellation token is activated. When that occurs I would like Buffer to emit all events which it holds at that moment and not to wait until Timer ticks. Is that possible?
Example: I have items 1, 2, 3 emitted in 2 seconds so limit 10 items is not reached and limit 5 seconds is not reached. Now cancellation is requested and I would like to get all buffered items to at least "see" them before ending request/process without waiting additional 3 seconds for timer.
As I see the possible solution if I understand it correctly:
public static IObservable<Unit> ToObservable(this CancellationToken ct) =>
Observable.Create<Unit>(observer => ct.Register(() =>
{
observer.OnNext(Unit.Default);
observer.OnCompleted();
})
);
static void Main()
{
var cts = new CancellationTokenSource(6000);
Observable.Interval(TimeSpan.FromSeconds(0.5))
.TakeUntil(cts.Token.ToObservable())
.Buffer(10)
.Subscribe(b=>
{
// ... processing
});
Console.ReadLine();
}
The main idea is to finish Buffer's source sequence on cancellation request - it makes Buffer immediately release collected items and finish its work, and later on Subscribe you just check if the cancellation was requested and make an appropriate decision upon data arrived.