Building Realtime Web Applications With ASP.NET SignalR
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This document discusses building real-time web applications and introduces SignalR as a library that simplifies creating persistent HTTP connections for real-time functionality. It describes how older techniques like polling and long polling have disadvantages, while newer techniques like web sockets have limited browser support. SignalR abstracts these complexities by automatically negotiating the best transport and allowing real-time functionality to be easily added to applications. It also enables scaling out applications across servers and backing services. Demos and components of SignalR are presented, along with how it provides a fallback mechanism to support older servers and clients.
![What is SignalR?
An open-source series of libraries that provide an
abstraction around persistent HTTP connections
SignalR makes real-time HTTP so easy
it seems like magic that it works
[In English, please]](https://image.slidesharecdn.com/building-20realtime-20web-20applications-20with-20asp-130601120052-phpapp02/85/Building-Realtime-Web-Applications-With-ASP-NET-SignalR-17-320.jpg)
Building Realtime Web Applications With ASP.NET SignalR
- 2. Your Presenter Shravan Kumar Kasagoni Software Engineer @ Thomson Reuters Microsoft MVP – ASP.NET / IIS | MCP Microsoft User Group Hyderabad http://theshravan.net @techieshravan
- 3. Agenda Introduction to real-time apps What is SignalR? Demos SignalR Components Scaleout SignalR
- 4. Real-time Application? Real-time functionality is the ability to have server code push content to connected clients instantly as it becomes available, rather than having the server wait for a client to request new data.
- 5. Why Real-time? Users want the latest info, NOW!
- 6. Show Me Some Examples Twitter, Facebook, Mail - live searches/updates Stock streamers Auctions Interactive games Live Scores Collaborative apps (google docs, office web apps) Live user analytics (live graphs)
- 7. How to build real-time web apps?
- 8. HTTP is an old beast… Never designed for real-time communications Web is all about request-response Web is stateless
- 10. Periodic polling Poll from time to time using Ajax Delay in communication due to polling interval Wastes bandwidth & latency Server Client Polling interval
- 11. Long polling Poll but doesn’t respond until there's data Poll again after data received or after the connection times out Consumes server & threads & connection resources Server Client
- 12. Forever Frame Server tells client that response is chucked Client keeps connection open until server closes it Server pushed data to the client followed by 0 Consumes server threads Server Client
- 13. HTML5 Web sockets Extension to HTTP Provides raw sockets over HTTP Full-duplex Traverses proxies It's still a draft Not every proxy server supports it Not every web server supports it Not every browser supports it They are raw sockets!
- 14. too many options
- 17. What is SignalR? An open-source series of libraries that provide an abstraction around persistent HTTP connections SignalR makes real-time HTTP so easy it seems like magic that it works [In English, please]
- 18. SignalR on Old Servers or Clients
- 19. SignalR on New Servers and Clients
- 20. Basically…
- 21. What does SignalR do? Client to Server Persistent connection over HTTP Easily build multi-user, real-time web applications Auto-negotiates transport
- 26. http://shootr.signalr.net http://firework.cloudapp.net
- 30. Three backplanes Windows Azure Service Bus SQL Server Redis
- 31. Backplane Load balancing via a common transport mechanism