UniRx doesn't have Observable.Generate() method

Question

.NET Reactive Extensions has a neat method to generate sequences using corecursion which is called Observable.Generate.

I can't find an equivalent for that method in UniRx (Unity Reactive Extensions). Could you please help me to port this code sample into UniRx environment?

public static IObservable<long> Timer(TimeSpan dueTime)
{
    return Observable.Generate(
        0L,
        i => i < 1,
        i => i + 1,
        i => i,
        i => dueTime
    );
}

Sadly, yes, it must be. It is core to Rx. If you have `Observable` you must have it. — Enigmativity, Feb 02 '19 at 08:03
I am following Mr. Lee Campbell's book on Rx.NET. Observable class is available and creating, transitioning, transforming work, except the Observable.Generate() method. I'll perform a string search for the Generate method in the UniRx repo today. — nipunasudha, Feb 02 '19 at 08:08

score 1 · Answer 1 · answered Aug 04 '20 at 20:06

1

Generate is an operator that's not featured into UniRX.

You can try to create your own version of the Generate by using Operator Observer Base or use the Create operator.

What are you trying to do exactly? Maybe I can help you in some way.

answered Aug 04 '20 at 20:06

Arthur Leandro

11
1

score 0 · Answer 2 · answered Oct 21 '20 at 17:23

I tried and ... It is work. But I don't know is it OK? =D

public static IObservable<DateTime> CreateRandomTimer(int minValue, int maxValue)
{
    return Observable.CreateSafe<DateTime>(observer =>
    {
        var random = new Random();

        var timer = new Timer
        {
            Enabled = true,
            Interval = random.Next(minValue, maxValue) * 1000
        };
        
        void OnTimerElapsed(object sender, ElapsedEventArgs e)
        {
            observer.OnNext(e.SignalTime);

            var currentTimer = (Timer) sender;
            currentTimer.Stop();
            currentTimer.Interval = random.Next(minValue, maxValue) * 1000;
            currentTimer.Start();
        }

        timer.Elapsed += OnTimerElapsed;
        timer.Start();

        return Disposable.Create(() =>
        {
            timer.Elapsed -= OnTimerElapsed;
            timer.Dispose();
        });
    });
}

UniRx doesn't have Observable.Generate() method

2 Answers2