Reactive Throttle Returning All Items Added Within The TimeSpan

问题

Given an IObservable<T> is there a way to use Throttle behaviour (reset a timer when an item is added, but have it return a collection of all the items added within that time?

Buffer provides a similar functionality it that it chunks the data up into IList<T> on every time span or count. But I need that time to reset each time an item is added.

I've seen a similar question here, Does reactive extensions support rolling buffers?, but the answers don't seem ideal and it's a little old so I wondered if the release version of Rx-Main now supports this functionality out the box.

回答1:

As I answered in the other post, yes you can! Using the Throttle and Window methods of Observable:

public static IObservable<IList<T>> BufferUntilInactive<T>(this IObservable<T> stream, TimeSpan delay)
{
    var closes = stream.Throttle(delay);
    return stream.Window(() => closes).SelectMany(window => window.ToList());
}

回答2:

I amended Colonel Panic's BufferUntilInactive operator by adding a Publish component, so that it works correctly with cold observables too:

/// <summary>Projects each element of an observable sequence into consecutive
/// non-overlapping buffers, which are produced based on time and activity.</summary>
public static IObservable<IList<T>> BufferUntilInactive<T>(
    this IObservable<T> source, TimeSpan dueTime)
{
    return source.Publish(published =>
        published
            .Window(() => published.Throttle(dueTime))
            .SelectMany(window => window.ToList())
    );
}

回答3:

Wouldn't it work with

Observable.BufferWithTimeOrCount<TSource> Method (IObservable<TSource>, TimeSpan, Int32)?

来源：https://stackoverflow.com/questions/8849810/reactive-throttle-returning-all-items-added-within-the-timespan

标签

system.reactive