SignalR 101
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This document discusses different approaches for building real-time web functionality and introduces SignalR as a solution. It describes how earlier approaches like periodic pooling and long polling have disadvantages. Web sockets are ideal but have limitations in support across browsers, proxies, and web servers. SignalR abstracts these transports to provide a simple and robust library for adding real-time functionality to ASP.NET applications without these constraints. The document demonstrates SignalR and provides resources to learn more.
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SignalR 101
- 1. MICROSOFT DEVELOPER PHILIPPINES TECHNICAL SHARING SIGNALR 101 Patrick Oliveros Microsoft MVP ASP.NET/IIS
- 2. The web evolved Event-based, real-time UI Partial page updates (Ajax), RIA Dynamic pages, forms Static HTML pages
- 3. Scenarios
- 4. Implementations Periodic Pooling Long Polling Server-Sent Events Web Sockets
- 5. Periodic Pooling Polling interval Cons: • Poll from time to time using Ajax • Delay in communications due to polling interval • Wastes bandwidth & latency
- 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. 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. So What Now? Superman SignalR to the rescue!
- 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. Enter SignalR
- 11. Transport Priority Web Sockets Server-Sent Events Forever Frame Long Polling
- 12. Demo
- 13. Resources • SignalR project page: http://www.signalr.net • SignalR on github: https://github.com/SignalR/SignalR
- 14. Thanks!