Reactive Programming by UniRxfor Asynchronous & Event Processing

2014/07/30Yoshifumi Kawai - @neuecc

Self Introduction

@

CTO

C# 5.0 + .NET Framework 4.5 + ASP.NET MVC 5

C# Web

@

Microsoft MVP for Visual C# / C#

Web http://neue.cc/

Twitter @neuecc

What’s Reactive Programming?

Functional Reactive Programming

http://en.wikipedia.org/wiki/Functional_reactive_programming

Excel ……

Reactive Extensions

FRP (Haskell )

2009 .NET Reactive Extensions

Functional Reactive Programming

http://en.wikipedia.org/wiki/Functional_reactive_programming

Excel ……

Reactive Extensions

FRP (Haskell )

2009 .NET Reactive Extensions

UniRx

ReactiveExtensions(Rx) Unity

Gartner’s Hype Cycle

2013 Application Architecture/Application Development

On the Rise - Reactive Programming

Technology Radar Languages & Framework

ThoughtWorks Technology Radar July 2014

Rx ADOPT OK

TRIAL

ASSESS

HOLD

Across Languages

RxJava

Netflix for Java/Scala

ReactiveCocoa

GitHub 5073 for Objective-C

RxJS/bacon.js

JavaScript

RxJS bacon.js

UniRx

UniRx 100

Asset Store

Reactive Programming

Reactive Extensions

RxJava Wiki

UniRx - Reactive Extensions for Unity

Reactive Extensions(Rx) is

LINQ

C# LINQ

LINQ(to Objects) C#

Rx LINQ

LINQ

Reactive

Programming

Rx

UniRx is

.NET(C#) Rx Unity

https://github.com/neuecc/UniRx

http://u3d.as/7tT (Asset Store, Price : FREE)

Rx + Unity

C# ……

https://rx.codeplex.com/

Bart De Smet Microsoft

Unity :)

Q

C# LINQ Rx 5

……

3 @IT

http://www.atmarkit.co.jp/fdotnet/introrx/introrx_01/introrx_01_01.html

AOT Safe

LINQ iOS AOT

Unity + iOS AOT

http://neue.cc/2014/07/01_474.html

Reactive Extensions isLINQ to EventsLINQ to Asynchronous

Event is Observable Sequence

Rx

IObservable<T> time

OnTap

3 Tap

5 Tap

1 Tap

IEnumerable <-> IObservable

IObservable<T> time

IEnumerable<T> length

IEnumerable<T> length

.Where(x => x % 2 == 0)

IObservable<T> time

.Where(x => x % 2 == 0)

Where

LINQ

Push Event Stream

Event Processing

Interactive/Visualize

Internet of Things

Push

Kinect

Oculus

Twitter Streaming

PubSub, WebSocket

Logs are Stream(Fluentd, Amazon Kinesis, Azure Event Hubs)

MonoBehaviour Update , OnMouseClick, etc...

LINQ

LINQ

LINQ

LINQ

Better EventHandling

Limitations of .NET Events

// public event Action<int> OnHitDamage;

// player.OnHitDamage += (damage) =>{

if (damage >= 1000){

// " "}

};

player.OnHitDamage -= /* */

Observable Sequence to the Rescue

IObservable<int> onHitDamage = player.OnHitDamage;

var criticalHit = onHitDamage.Where(x =>x >= 1000);

var subscription = criticalHit.Subscribe(damage => /* ... */);

subscription.Dispose();

LINQ

Lifecycle Resource Management// DisposableCompositeDisposable subscriptions = new CompositeDisposable();

void Awake(){

var player = new Player();var enemy1 = new Player();var enemy2 = new Player();

// player.OnHitDamage.Subscribe().AddTo(subscriptions);enemy1.OnHitDamage.Subscribe().AddTo(subscriptions);enemy2.OnHitDamage.Subscribe().AddTo(subscriptions);

}

void OnDestroy(){

// subscriptions.Dispose();

}

CuringYourAsynchronousProgrammingBlues

yield return is awaitable

IEnumerator GetBingText(){

var www = new WWW("http://bing.com/");yield return www; //

Debug.Log(www.text);}

It’s Unity’s awesome feature!

But...IEnumerator GetGoogle(){

var www = new WWW("http://google.com/");yield return www;

}

IEnumerator OnMouseDown(){

try{

// yield return StartCoroutine(GetGoogle());

}catch{}

}

IEnumerator

yield return try-catch

IEnumerator GetGoogle(Action<string> onCompleted, Action<Exception> onError){

var www = new WWW("http://google.com/");yield return www;

if (!www.error) onError(new Exception(www.error));else onCompleted(www.text);

}

……(JavaScript )

IEnumerator

Rx Unity

ObservableWWW.Get("http://google.co.jp/").SelectMany(x => ObservableWWW.Get(x)) // .Retry(3) // 3.Subscribe(

x => Debug.Log(x), // ex => Debug.LogException(ex)); //

Rx

x x

x

Why can Rx apply to asynchronous?

x

IEnumerable<T>

IObservable<T>

IObservable<T> time

event

async

IE<T>

Why can Rx apply to asynchronous?

x

IEnumerable<T>

IObservable<T>

IObservable<T> time

event

async

IE<T>

Orchestrate Rx

var parallel = Observable.WhenAll(ObservableWWW.Get("http://google.com/"),ObservableWWW.Get("http://bing.com/"),ObservableWWW.Get("http://unity3d.com/"));

parallel.Subscribe(xs =>{

Debug.Log(xs[0].Substring(0, 100)); // googleDebug.Log(xs[1].Substring(0, 100)); // bingDebug.Log(xs[2].Substring(0, 100)); // unity

});

IObservable<T> time

IObservable<T> time

WhenAll

Observable.WhenAll(

ObservableWWW.Get(),

ObservableWWW.Get(),

ObservableWWW.Get())

Subscribe(xs => xs[0], xs[1], xs[2])

Conclusion

Reactive Programming

UniRx

Available Now

GitHub - https://github.com/neuecc/UniRx/

Asset Store(FREE) – http://u3d.as/7tT

Update

(v4.4)