Introduction to SignalR
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SignalR is an open-source library for ASP.NET that enables persistent connections between server and client, allowing for real-time data push. It offers various use cases like chat applications, real-time analytics, and collaborative tools, while providing both low-level and high-level implementation approaches. The document includes examples of SignalR client libraries and discusses how it operates over HTTP rather than solely relying on WebSockets.
Introduction to SignalR
- 1. Adam Mokan @adammokan Desert Code Camp Nov 5th, 2011
- 2. 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
- 3. 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.
- 4. Samples
- 5. 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 }
- 6. SignalR client libraries • SignalR.Js - Javascript SignalR client • SignalR.Client - .NET client for SignalR • SignalR.Client.WP7 - Windows Phone client for SignalR
- 7. Wait, I thought WebSockets were meant for this? This all works over HTTP?
- 8. Let’s look at how we interact with the web in a vast majority of scenarios and how some HTTP cleverness allows SignalR to work.
- 9. The basic Request-Response pattern
- 11. A simple example of polling via AJAX.
- 14. Let’s look at some code.
- 15. Resources Bitly bundle * - bit.ly/signalr-dcc11 SignalR git repo - github.com/SignalR/SignalR SignalR docs - github.com/SignalR/SignalR/wiki * More resources will be added to the bitly bundle in the future
- 16. Thank you! Please review the presentation with any feedback or criticisms at speakerrate.com/talks/8878