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SignalR 101


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This topic covers SignalR on a general level. The demo used for this talk was a modification of the default chat application to make it more descriptive and realistic in enterprise setting.

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SignalR 101

  2. 2. The web evolved Event-based, real-time UI Partial page updates (Ajax), RIA Dynamic pages, forms Static HTML pages
  3. 3. Scenarios
  4. 4. Implementations Periodic Pooling Long Polling Server-Sent Events Web Sockets
  5. 5. Periodic Pooling Polling interval Cons: • Poll from time to time using Ajax • Delay in communications due to polling interval • Wastes bandwidth & latency 
  6. 6. Long Pooling Cons: • Poll but don’t respond untill there’s data • Poll again after data received or after the connection times out • Consumes server threads & connection resources 
  7. 7. Web Sockets (HTML 5) • Extension to HTTP • Provide raw sockets over HTTP • Full-duplex • Traverses proxies • It’s still a draft… • Not every proxy server supports it  • Not every webserver supports it  • Not every browser supports it  • They are raw sockets!
  8. 8. So What Now? Superman SignalR to the rescue!
  9. 9. Enter SignalR• ASP.NET SignalR is a new library for ASP.NET developer that makes it incredibly simple to add real-time web functionality to your applications• Async signaling library for .NET to help build real-time, multi-user interactive web applications ( aka persistent connection abstraction for .NET);
  10. 10. Enter SignalR
  11. 11. Transport Priority Web Sockets Server-Sent Events Forever Frame Long Polling
  12. 12. Demo
  13. 13. Resources • SignalR project page: • SignalR on github:
  14. 14. Thanks!