Reactive Extensions, Rx
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This document provides an overview of Reactive Extensions (Rx), which is a library for composing asynchronous and event-based programs using observable sequences. It discusses Rx's mission and current version, support for .NET frameworks and JavaScript, key concepts like observables and observers, exception handling, composing asynchronous code, and examples of Rx in libraries and applications.
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Reactive Extensions, Rx
- 2. about me Kharkiv – Ciklum (Scale Point) - .NET – podcasts – open source
- 3. Erik Meijer Professor at Utrecht University One of the designers of Haskell Microsoft Architect LINQ Volta Rx
- 4. Rx mission “Rx is a library for composing asynchronous and event-based programs using observable collections.”
- 5. Rx current version • Base interfaces in BCL .NET 4 and WP7 • Stable version: v1.0.10621 Experimental Release: v1.1.11011 Last update: October 12, 2011 • http://msdn.microsoft.com/en- us/data/gg577609
- 6. Rx for .NET .NET 3.5 SP1 .NET 4 .NET Framework 4.5 (with Metro support on Windows 8 Developer Preview) Silverlight Silverlight 4 Silverlight 5 Windows Phone Java script
- 8. “observable” interface IObservable out interface IEnumerable out IDisposable Subscribe IObserver IEnumerator Get interface IEnumerator out IDisposable interface IObserver in bool Move void On get void On Exception void void On
- 9. Application MoveNext Got next? Interactive Reactive OnNext Have next! IEnumerable<T> IObservable<T> IEnumerator<T> IObserver<T> Environment
- 10. IDisposable interface IObservable out IDisposable Subscribe IObserver interface IObserver in void On void On Exception void On
- 12. exception handling Observable.Catch() Observable.Throw() Observable.Retry() Observable.Timeout()
- 14. “composing” • Linq(Where, Take, Skip, Sum, Max, Any, …) • Statements(If, Case, For, While, DoWhile) • Combinators(Merge, Zip, Amb, …) • Exceptions(Catch, Retry, ..) • Rx(Delay, Throttle, Interval, Publish, …)
- 18. Rx unit testing
- 19. more Rx Rx Contrib http://rxcontrib.codeplex.com/ Reactive Extensions - Extensions (Rxx) http://rxx.codeplex.com/ Rx Power Toys http://rxpowertoys.codeplex.com/
- 20. examples
- 21. ReactiveUI http://www.reactiveui.net/
- 22. “Anna” http://github.com/jfromaniello/Anna
- 24. TweetSharp.Rx https://github.com/jhollingworth/TweetSharp.Rx
- 25. Rx in books Programming Reactive Extensions and LINQ Jesse Liberty, Paul Betts http://www.amazon.com/Programming-Reactive-Extensions-Jesse-Liberty/dp/1430237473/
- 26. out of scope • Hot&Cold • Marble diagrams • IQbservable<T> (IQueryable<T> + IObservable<T>) • ISubject, Subject<T> • ReactiveJS • ….
- 27. information Rx team blog http://blogs.msdn.com/rxteam DevLabs http://msdn.microsoft.com/en-us/data/gg577609 MSDN forums http://social.msdn.microsoft.com/Forums/en-US/rx Channel9 http://channel9.msdn.com/Tags/Rx Wiki http://rxwiki.wikidot.com Examples http://rxworkshop.codeplex.com/
- 28. summary
- 29. questions dimapasko@gmail.com pad@ciklum.net 31337 @dimapasko
Editor's Notes
- давайте вспомним buzzwords: Azure, Silverlight, Windows Phone
- Speaker tips:The essential difference is who controls how the data is received.Philosophically this is nothing but how the application and the environment work together.Looking from the application’s point of view:Does it ask the environment – interactively – for data? enumerableDoes it passively wait for the environment to send data and react to it? observableBoth are complementary models. One doesn’t (aim to) replace the other.Matter of which one aligns more closely to which model:SQL’ s TDS protocol is pull-based, hence IE<T> is the best fit.Stock broker services may be push-based, hence IO<T> is a better match.Will see how one can convert between those.