1. IT Camp 2011 Thanks for coming! ITCamp is made possible by our sponsors:

2. Duplex Communications with WCF and Azure Florin Cardașim, software developer RomSoft Iași, www.rms.ro caf@rms.ro | twitter.com/cardasim

3. Session agenda Enterprise duplex. Non-browser clients WCF duplex bindings, router service Windows Azure Service Bus Web duplex. Browser clients Simple polling, comet/long polling WebSockets Q&A

4. Enterprise duplex Non-browser clients - WCF duplex bindings, router service - Windows Azure Service Bus

5. Full duplex using WCF NetTcpBinding Event publisher Event consumer Full duplex TCP Publisher requires public IP Custom ports open in firewall

6. “Full duplex” using WCF WSDualHttpBinding Event publisher Event consumer NAT Duplex HTTP Network address translation makes connection back impossible

7. “Full duplex” using WCF WSHttpBinding Event publisher Event consumer Dual HTTP Publisher and consumers require public IP That’s fine, BUT we want the servers INSIDE the enterprise

8. WCF Router Service Event publisher Router Service Event consumer Router Service TCP Dual HTTP TCP Firewall and NAT friendly Routers have protocol bridging, failover etc Not bad, but quite crowded. Can you do better?

9. Windows Azure Service Bus sb://itcampnamespace.servicebus.windows.net/publisher Relay Service Event publisher Event consumer

11. RouterService, NetTcpBinding, WsDualHttpBinding

13. WEB duplex Browser clients - Simple polling, comet/long polling - WebSockets

14. Http polling Wasted resources, many requests return no data Frequent polling means higher load on the server

15. Comet/long polling Bandwidth: small payload, large http headers overhead Scalability: pressure on memory, bandwidth, threads/processes

16. DEMO An open source, WCF based, long polling server implementation: http://laharsub.codeplex.com/

18. Html5/websockets: server Socket.IO Fallbacks Adobe Flash Socket AJAX Long Polling AJAX Multipart Streaming Forever iFrame JSONP Polling http://socket.io/ Socket.IO (Java, node.js) Jetty (Java) Ruby/EventMachine Python/Twisted WCF websocket prototype  … others

19. Html5/websockets: server Test browser support: http://websocket.org/echo.html Microsoft is still experimenting  http://html5labs.com

20. DEMO Some WebSockets in action: http://kaazing.me http://retrospectiveapp.heroku.com

21. DEMO Using the WCF WebSockets prototype from http://html5labs.com

22. References channel9.msdn.com/Learn/Courses/Azure/ServiceBus en.wikipedia.org/wiki/Comet_%28programming%29 html5rocks.com/tutorials/websockets/basics websocket.org pusher.com kaazing.com live.visitmix.com/MIX11?q=web+sockets paulbatum.com

23. Q&A

24. Don’t forget! Get your free Azure pass! 30+15 days, no CC req’d http://bit.ly/ITCAMP11 Promo code: ITCAMP11 We want your feedback! Win a WP7 smartphone Fill in your feedback forms Raffle: end of the day