reactive xamarin. ua mobile 2016

Reactive Xamarin

Olexandr Leuschenko uamobile 2016

Everything is an

object

Alan Kay

Everything is a stream of objects!

Streams are

observable

represent data as streams with observables !

query with LINQ !

rule the concurrency with schedulers

Observables + LINQ + Schedulers

Rx =Observables + LINQ + Schedulers

Reactive Xamarin =Rx + Xamarin

Q & A

Agenda

• What is Observable?

• What about LINQ?

• Master time with Schedulers

• Why bother?

Agenda

• What is Observable?

• What about LINQ?

• Master time with Schedulers

• Why bother?

stream is a collection

collection is a stream

IEnumerator

• object Current { get; }

• bool MoveNext ();

• void Reset ();

PULL

PULL

PUSH

IObserver

• void OnNext (T value);

• void OnCompeted ();

• void OnError (Exception exception);

PULL vs PUSH

SYNC vs ASYNC

I have TPL

Single Value Multiple Values

SYNC T IEnumerable<T>

ASYNC Task<T> IObservable<T>

How to create Observables? • Factory Methods ◦ Observable.Return ◦ Observable.Empty ◦ Observable.Never ◦ Observable.Throw ◦ Observable.Create • Unfold methods ◦ Observable.Range ◦ Observable.Interval ◦ Observable.Timer ◦ Observable.Generate • Paradigm Transition ◦ Observable.Start ◦ Observable.FromEventPattern ◦ Task.ToObservable ◦ Task<T>.ToObservable ◦ IEnumerable<T>.ToObservable ◦ Observable.FromAsyncPattern

Tiny demo

Agenda

• What is Observable?

• What about LINQ?

• Master time with Schedulers

• Why bother?

Reactive LINQ is like LINQ, but Reactive

LINQ & Observables

RxMarbleshttp://rxmarbles.com

Agenda

• What is Observable?

• What about LINQ?

• Master time with Schedulers

• Why bother?

Events are single-thread

Rx is single-thread

Schedulers• ImmediateScheduler — will start the specified

action immediately

• CurrentThreadScheduler — will schedule action to be performed on the thread that makes the original call

• DispatcherScheduler — will scheduler action on the current Dispatcher

• …

TimeScheduler

Teeny-weeny Demo

Agenda

• What is Observable?

• What about LINQ?

• Master time with Schedulers

• Why bother?

Reactive UI• UI-friendly extension methods

• Base ViewModel

• Base View

• DI

• Logging

• Supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Xamarin Forms, WPF, Windows Forms, Windows Phone 8, Windows Store and Universal Windows Platform (UWP)

Reactive UI• UI-friendly extension methods

• Base ViewModel

• Base View

• DI

• Logging

• Supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Xamarin Forms, WPF, Windows Forms, Windows Phone 8, Windows Store and Universal Windows Platform (UWP)

Reactive UI• UI-friendly extension methods

• Base ViewModel

• Base View

• DI

• Logging

• Supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Xamarin Forms, WPF, Windows Forms, Windows Phone 8, Windows Store and Universal Windows Platform (UWP)

RxLite

• UI-friendly extension methods

• Optional base ViewModel

RxLite Simple Rules

• One-Way binding — ObservableAsProperty

• Two-Way binding — property with RaiseAndSetIfChanged

• Command — ReactiveCommand

Reactive UI

RxLite

So?

Playground demohttps://github.com/OlexaLe/RxLite

Thanks!

• olexa.le@gmail.com

• http://twitter.com/olexale

Q&A

olexa.le@gmail.com http://twitter.com/olexale