Does reactive extensions support rolling buffers?

Question

I\'m using reactive extensions to collate data into buffers of 100ms:

this.subscription = this.dataService
    .Where(x => !string.Equals(\"FOO\", x.Key.S         


        

Answer 1

I wrote an extension to do most of what you're after - BufferWithInactivity.

Here it is:

public static IObservable> BufferWithInactivity(
    this IObservable source,
    TimeSpan inactivity,
    int maximumBufferSize)
{
    return Observable.Create>(o =>
    {
        var gate = new object();
        var buffer = new List();
        var mutable = new SerialDisposable();
        var subscription = (IDisposable)null;
        var scheduler = Scheduler.ThreadPool;

        Action dump = () =>
        {
            var bts = buffer.ToArray();
            buffer = new List();
            if (o != null)
            {
                o.OnNext(bts);
            }
        };

        Action dispose = () =>
        {
            if (subscription != null)
            {
                subscription.Dispose();
            }
            mutable.Dispose();
        };

        Action>>> onErrorOrCompleted =
            onAction =>
            {
                lock (gate)
                {
                    dispose();
                    dump();
                    if (o != null)
                    {
                        onAction(o);
                    }
                }
            };

        Action onError = ex =>
            onErrorOrCompleted(x => x.OnError(ex));

        Action onCompleted = () => onErrorOrCompleted(x => x.OnCompleted());

        Action onNext = t =>
        {
            lock (gate)
            {
                buffer.Add(t);
                if (buffer.Count == maximumBufferSize)
                {
                    dump();
                    mutable.Disposable = Disposable.Empty;
                }
                else
                {
                    mutable.Disposable = scheduler.Schedule(inactivity, () =>
                    {
                        lock (gate)
                        {
                            dump();
                        }
                    });
                }
            }
        };

        subscription =
            source
                .ObserveOn(scheduler)
                .Subscribe(onNext, onError, onCompleted);

        return () =>
        {
            lock (gate)
            {
                o = null;
                dispose();
            }
        };
    });
}