Introduction to SignalR

Adam Mokan @adammokanDesert Code Camp Nov 5th, 2011

What is SignalR?• Creates a “persistent connection” between server and client(s) in ASP.NET allowing you to push data from server to client.• Led by David Fowler and Damian Edwards.• Not an official Microsoft project.• OSS project on Github with MIT License.• NuGet packages available.• Simple to setup & just works. Install-Package SignalR

Potential use-cases • Chat - Don’t be that developer * • Real-time impact analysis on current users • Pub-sub mechanism for analytics, logging, exception capture • Real-time charting without repeat client-side ajax polling • Collaborative applications allowing multiple users to interact with the same screen • Real-time analytics dashboard showing client details (geo-location based on IP address, browser info, screen resolution, etc) • “Growl-like” notifications for users* No offense towards someone that has the real need to build a chat application from scratch but this reminds me of the “Learn Rails and build a blog” tutorials years ago.

Samples

SignalR.Server• Two primary approaches to implementing • Persistent Connections (low-level) • Implements an IHttpHandler • Must implement a route to make the endpoint accessible. • public class TestEndpoint : PersistentConnection { // do something } • Hubs (high-level) • Automatically implements route over “<app>/signalr/hubs/” by convention. • public class TestHub : Hub { // do something }

SignalR client libraries• SignalR.Js - Javascript SignalR client• SignalR.Client - .NET client for SignalR• SignalR.Client.WP7 - Windows Phone client for SignalR

Wait, I thought WebSockets were meant for this?This all works over HTTP?

Let’s look at how we interact with the webin a vast majority of scenarios and how some HTTP cleverness allows SignalR to work.

The basic Request-Response pattern

A simple example of polling via AJAX.

http://www.flickr.com/photos/londonmatt/4204313724/What is long-polling?

Let’s look at some code.

Resources Bitly bundle * - bit.ly/signalr-dcc11SignalR git repo - github.com/SignalR/SignalRSignalR docs - github.com/SignalR/SignalR/wiki * More resources will be added to the bitly bundle in the future

Thank you!Please review the presentation with any feedback or criticisms at speakerrate.com/talks/8878

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Introduction to SignalR

by Adam Mokan

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