Code Reactions – An Introduction to Reactive Extensions

Jason BockPractice Lead

»http://www.magenic.com

»http://www.jasonbock.net

»https://www.twitter.com/jasonbock

»https://www.github.com/jasonbock

» jasonb@magenic.com

Personal Info

https://github.com/JasonBock/

CodeReactions

Downloads

»Why Rx?

»Using Rx

Overview

Remember…

https://github.com/JasonBock/

CodeReactions

Why Rx?

http://frmilovan.files.wordpress.com/2010/05/ford-assembly-line.jpg

Why Rx?

http://icons.iconarchive.com/icons/3xhumed/tools-hardware-pack-4/256/CPU-Z-icon.png

Why Rx?

MainWindow.xaml<Button

Click="OnStartListeningClick" />

MainWindow.xaml.csprivate void OnStartListeningClick(

object sender, RoutedEventArgs e){

// ...}

Why Rx?

http://www.lolroflmao.com/wp-content/uploads/2012/05/wrong-wrong-wrong.jpg

Why Rx?

http://www.redorbit.com/media/uploads/2013/03/ChemicalReactions_031513-617x416.jpg

http://icyroadsafety.com/parts/blackice1.jpg

http://www.venelogia.com/uploads/mandrake/2012-movie.jpg

Why Rx?

http://icons.iconarchive.com/icons/3xhumed/tools-hardware-pack-4/256/CPU-Z-icon.png

Why Rx?

http://techblog.netflix.com/2013/01/reactive-programming-at-netflix.html

http://savas.me/2014/04/reactive-computing-at-the-heart-of-cortana/

http://reactconf.com/

Why Rx?

Why Rx?

http://2.bp.blogspot.com/-6m8BQlS7-

g8/UArVdKi8yJI/AAAAAAAADFs/tcUDGbkm9Hg/s1600/ChemicalExplosion.jpg

Why Rx?

http://wondrouspics.com/wp-content/uploads/2012/04/bomb-explosion-nuclear-explosions-wallpaper-

540x337.jpg

Why Rx?

StocksDB

What is the current stockprice for MSFT?

37.96 (3/3/2014, 8:32:00 AM Central)

Why Rx?

StocksDB

What is the current stockprice for MSFT?

Why Rx?

StocksDB

37.97

37.98

Tell me when the stockprice changes for MSFT

Why Rx?

Comment feeds

Sensor data

Key logging

Navigation events

File watching

UI events

Game play

Why Rx?

http://www.reactivemanifesto.org/images/full-reactive.png

Why Rx?

http://rehansaeed.co.uk/reactive-extensions-part1-replacing-events/

Using Rx

.NET

Java

C++

Ruby

JavaScript

Python

https://github.com/Reactive-Extensions

Using Rx

Using Rx

http://blog.sudobits.com/wp-content/uploads/2011/08/keylogging-on-ubuntu.jpg

» In .NET 4.0

› IObserver<T>− OnCompleted()

− OnError(Exception e)

− OnNext(T value)

› IObservable<T>− Subscribe(IObservable<T> observer)

Using Rx

Demo: Observe Key PressesCode Reactions –An Introduction to Reactive Extensions

Using Rx

public class MyObservable: IObservable<char>

Observable.FromEventPattern(...)

Demo: Creating ObservablesCode Reactions –An Introduction to Reactive Extensions

Using Rx

the quick brown fox jumped over the lazy dog

ECBFEDEEADG.Where(…) .Take(…) 6.4 seconds

Demo: Modifying ObservablesCode Reactions –An Introduction to Reactive Extensions

Using Rx

the quick brown fox jumped over the lazy dog

OnError()

Retry()

Demo: Exceptions and ObservablesCode Reactions –An Introduction to Reactive Extensions

Using Rx

http://www.teetshirts.com/images/uploads/volume-to-11.jpg

Using Rx

REST API KeyloggerWeb API

Sig

nalR

Demo: Keylogger PipelineCode Reactions –An Introduction to Reactive Extensions

Using Rx

http://social.eli.ubc.ca/files/2011/08/fail.jpg

Using Rx

http://nimitdholakia.files.wordpress.com/2011/01/time.jpg

Demo: Unit Testing and RxCode Reactions –An Introduction to Reactive Extensions

Using Rx

http://www.dotnetfoundation.org/

Code Reactions – An Introduction to Reactive Extensions

Jason BockPractice Lead

Remember… https://github.com/JasonBock/CodeReactions http://www.slideshare.net/jasonbock/code-reactions-an-

introduction-to-reactive-extensions References in the notes on this slide