Aspect oriented programming

Jul 19, 2011Download as pptx, pdf0 likes926 views

This document discusses aspect-oriented programming (AOP) and how it can be implemented using PostSharp. AOP aims to make cross-cutting concerns like logging and error handling easier to implement separately from business logic. It describes how PostSharp uses IL weaving to modify code at compile time or JIT to add aspects without changing the original code. Alternatives to PostSharp include using the .NET profiler API or proxies, but IL weaving generally has better performance. The document also briefly outlines how AOP may be improved in future versions of C# compilers like Roslyn.

Aspect-oriented programmingrobertmacleanwww.sadev.co.za ∞ @rmaclean ∞ robert@sadev.co.za

AgendaWhat, when, why of AOP?How is it implemented in PostSharp and how does it work?Alternatives to PostSharpLooking to the futureDiscussion

Every project has “boring” codesource: Microsoft Application Architecture Guide, 2nd Edition

AOP DetailsGoal to make cross cutting concerns easy to implement and focus on business codeXerox PARC in 2001AspectJMany implementations now daysAKA: AOSD

Scenario code – simple prime calculatorCustomer says it’s wrong. We need logging to diagnose…

Let’s add logging – trace input & outputEasy to miss some placesLots of repetition of codeNeed to teach thisNot portable5 extra lines of code

What about some procedural help?Not junior friendlyNeed 1 per signature15 extra lines of code

So how does aspects solve that?Feel like you are missing something?1 extra line of code

Under the hoodSource: .NET Reflector 6.8IL modified

Many ways to implement AOP in .NET currentlyPopular: IL Weaving @ compile or JITPostSharp & Mono.CecilLess:Hooking into .NET profiler APIProxies

IL Weaving.cs or .vb codeIL (pure)PostSharpIL (Merged)

Hooking the profilerDisadvantagesPoor performance

Not designed for thisAdvantagesNothing is safe from it’s power

Solves some fringe cases (i.e. mocking static methods)ApplicationCOM APICLRProfilerEnvironmental

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Aspect oriented programming

1. Aspect-oriented programmingrobertmacleanwww.sadev.co.za ∞ @rmaclean ∞ robert@sadev.co.za

2. AgendaWhat, when, why of AOP?How is it implemented in PostSharp and how does it work?Alternatives to PostSharpLooking to the futureDiscussion

3. Every project has “boring” codesource: Microsoft Application Architecture Guide, 2nd Edition

4. AOP DetailsGoal to make cross cutting concerns easy to implement and focus on business codeXerox PARC in 2001AspectJMany implementations now daysAKA: AOSD

5. Scenario code – simple prime calculatorCustomer says it’s wrong. We need logging to diagnose…

6. Let’s add logging – trace input & outputEasy to miss some placesLots of repetition of codeNeed to teach thisNot portable5 extra lines of code

7. What about some procedural help?Not junior friendlyNeed 1 per signature15 extra lines of code

8. So how does aspects solve that?Feel like you are missing something?1 extra line of code

9. Demo time…

10. Under the hoodSource: .NET Reflector 6.8IL modified

11. Many ways to implement AOP in .NET currentlyPopular: IL Weaving @ compile or JITPostSharp & Mono.CecilLess:Hooking into .NET profiler APIProxies

12. IL Weaving.cs or .vb codeIL (pure)PostSharpIL (Merged)

13. Hooking the profilerDisadvantagesPoor performance

14. Exceptionally complex

15. Not designed for thisAdvantagesNothing is safe from it’s power

16. Solves some fringe cases (i.e. mocking static methods)ApplicationCOM APICLRProfilerEnvironmental

17. ProxiesProxiedNormalMethod CallMethod CallProxyObjectDisadvantagesComplex with ContextBoundObject

18. Perf is worse than IL weavingAdvantagesUsing DI it can be easier

19. Perf is better than .NET profilerObject

20. Future: Post Roslyn TheoryRoslynNext version of C#/VB “compiler”Written in managed codeAvailable as a servicePost RoslynInsert new language semantics Approach the AspectJ style

21. SummaryAOPWay to untangle cross cutting concerns out of business codeGreat re-useCan be easy to use (depending on implementation)Many options to do this!

22. Questions & Discussions

Aspect oriented programming

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