reactive xamarin. ua mobile 2016
TRANSCRIPT
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
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?
Thanks!
• http://twitter.com/olexale
