public static IObservable <TSource> Throttle <TSource>(this IObservable <TSource> source, TimeSpan dueTime, IScheduler scheduler)
{
// this code is borrowed from Rx Official(rx.codeplex.com)
return(new AnonymousObservable <TSource>(observer =>
{
var gate = new object();
var value = default(TSource);
var hasValue = false;
var cancelable = new SerialDisposable();
var id = 0UL;
var subscription = source.Subscribe(x =>
{
ulong currentid;
lock (gate)
{
hasValue = true;
value = x;
id = unchecked (id + 1);
currentid = id;
}
var d = new SingleAssignmentDisposable();
cancelable.Disposable = d;
d.Disposable = scheduler.Schedule(dueTime, () =>
{
lock (gate)
{
if (hasValue && id == currentid)
{
observer.OnNext(value);
}
hasValue = false;
}
});
},
exception =>
{
cancelable.Dispose();
lock (gate)
{
observer.OnError(exception);
hasValue = false;
id = unchecked (id + 1);
}
},
() =>
{
cancelable.Dispose();
lock (gate)
{
if (hasValue)
{
observer.OnNext(value);
}
observer.OnCompleted();
hasValue = false;
id = unchecked (id + 1);
}
});
return new CompositeDisposable(subscription, cancelable);
}));
}
public static IObservable <TSource> ThrottleFrame <TSource>(this IObservable <TSource> source, int frameCount, FrameCountType frameCountType = FrameCountType.Update)
{
return(new Observable.AnonymousObservable <TSource>(observer =>
{
var gate = new object();
var value = default(TSource);
var hasValue = false;
var cancelable = new SerialDisposable();
var id = 0UL;
var subscription = source.Subscribe(x =>
{
ulong currentid;
lock (gate)
{
hasValue = true;
value = x;
id = unchecked (id + 1);
currentid = id;
}
var d = new SingleAssignmentDisposable();
cancelable.Disposable = d;
d.Disposable = IntervalFrame(frameCount, frameCountType)
.Subscribe(_ =>
{
lock (gate)
{
if (hasValue && id == currentid)
{
observer.OnNext(value);
}
hasValue = false;
}
});
},
exception =>
{
cancelable.Dispose();
lock (gate)
{
observer.OnError(exception);
hasValue = false;
id = unchecked (id + 1);
}
},
() =>
{
cancelable.Dispose();
lock (gate)
{
if (hasValue)
{
observer.OnNext(value);
}
observer.OnCompleted();
hasValue = false;
id = unchecked (id + 1);
}
});
return new CompositeDisposable(subscription, cancelable);
}));
}
