Rx 101

Introduction to Reactive Extensions

Transcript

1. Introduction to Rx Mateusz Stasch
2. 2 1 N (-> ∞) Synchronous T IEnumerable<T> Iterable<T> Asynchronous Task<T> Future<T> Promise<T> IObservable<T> Observable<T>
3. 3 IObservable<T> IObserver<T>
4. 4 IObservable<T> IObserver<T> public interface IObservable<out T> { IDisposable Subscribe(IObserver<T> observer); } public interface IObserver<in T> { void OnCompleted(); void OnError(Exception error); void OnNext(T value); }
5. 5 IObservable<T> IObserver<T> public interface IObservable<out T> { IDisposable Subscribe(IObserver<T> observer); } public interface IObserver<in T> { void OnCompleted(); void OnError(Exception error); void OnNext(T value); }
6. 6 IObservable<T> events.Throttle(TimeSpan.FromMilliseconds(100)) .Select(e => HandleDeviceConnDiscon(e.EventArgs)) .Subscribe(v => Console.WriteLine("2: {0}", v));
7. 7 IObservable<T> IObserver<T> subscribe
8. 8 IObservable<T> IObserver<T> subscribe onNext
9. 9 IObservable<T> IObserver<T> subscribe onNext / onCompleted
10. 10 IObservable<T> IObserver<T> subscribe onNext onError
11. 11 IObservable<T> IObserver<T> subscribe onNext unsubscribe
12. 12 Demo
13. 13 IObservable<T> IObserver<T> subscribe onNext onError
14. 14 IObservable<T> IObserver<T> subscribe onNext onError ObserveOn(Scheduler)
15. 15 IObservable<T> IObserver<T> subscribe onNext onError ObserveOn(Scheduler)
16. 16 IObservable<T> IObserver<T> subscribe onNext onError SubscribeOn(Scheduler)
17. 17 IObservable<T> IObserver<T> subscribe onNext onError SubscribeOn(Scheduler)
18. 18 IObservable<T> IObserver<T> subscribe onNext onError SubscribeOn(Scheduler)
19. 19 Rx will pick a default scheduler by using the principle of least concurrency… https://msdn.microsoft.com/en-us/library/hh242963(v=vs.103).aspx
20. 20 Schedulers  CurrentThread  Immediate  TaskPool  ThreadPool  NewThread
21. 21 Schedulers  CurrentThread  Immediate  TaskPool  ThreadPool  NewThread  Actor-Model  Timers  Own implementations
22. 22 Demo
23. 23 var sequence = new Subject<int>(); Console.WriteLine("Next line should lock the system."); var value = sequence.First(); sequence.OnNext(1); Console.WriteLine("I can never execute....");
24. 24 http://reactivex.io/ http://reactivex.io/documentation/operators/combinelatest.html
25. 25  https://gist.github.com/staltz/868e7e9bc2a7b8c1f754  http://reactivex.io/  http://reactivex.io/tutorials.html  http://www.introtorx.com/  Naming Convention  http://onoffswitch.net/rxjava-observables-akka-actors/ Bibliography