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Aop With Post Sharp
- 1. AOP with PostSharp NCSoft China PD Dept. training - Session 4 -- Lance Zhang http://blodfox777.cnblogs.com I am not an AOP expert.
- 2. Topics What is AOP Existing AOP Frameworks in .NET Introduce PostSharp How does PostSharp work How to use PostSharp Q & A
- 3. Suppose We have a System… It Grows… Code Smells similar… Now We've Got A Problem(Ctrl + C/V)… So We Concerns…
- 4. Application Concerns Functional Requirements Line-of-business. Non-Functional Concerns Logging Caching Transaction Security Validation Persistence …
- 5. Enter the Aspect. What is AOP?
- 6. Aspects - Reduce noise in source Move plumbing out of source, but keep behaviour the same AOP … doesn’t solve any new problems. is just too complex. adoption is all or nothing. Promotes sloppy design. Aspects … obscure program flow. can’t be unit tested. Debugging with Aspects is hard.
- 7. Aspects Lingo Advice The duplicated plumbing code we are removing Typically under 30 lines of code Behaviour that is injected at a join point Join points Places within the code where the Aspect is inserted Examples Entry/Exit of a method or property Class’s Type Definition
- 8. Aspects Lingo Point cut Locates Join Points to apply advice Filter driven– Automatic injection Find all Methods, of type Setter, in all classes where Namespace equals “Application.Entities” Attribute driven – Manual injection
- 9. Aspects Lingo Weaving Process of injecting functionality back into a component Can be performed by Text post processor – Magic comments can replaced by code Proxy container – Uses decorator pattern/hooks to allow code to be inserted Binary manipulation - Modifying assemblies - by replacing and injecting IL code
- 10. Existing AOP Frameworks in .NET AOP with Castle Windsor Dynamic Proxy Dynamic Proxy does the heavy-lifting of the IL generation for us Much easier for most requirements AOP with Spring.NET Can use something other than attributes such as XML configuration. Sorry, but actually I am unfamiliar with them…
- 13. Easy to use - like normal Attribute
- 14. Intercept any method - not only Virtual
- 15. More Join points - on: field access, exception
- 16. More controllability - break, change param or return
- 17. More transparent- no need “new proxy()”
- 18. Multicasting Custom Attributes- filter
- 19. Code quality after injection
- 22. When Can PostSharp Insert Code? PostSharp.Laos.OnMethodBoundaryAspect OnEntry OnExit OnSuccess OnException PostSharp.Laos.OnMethodInvocationAspect OnInvocation PostSharp.Laos.OnExceptionAspect OnException PostSharp.Laos.OnFieldAccessAspect OnGetValue OnSetValue
- 23. Other Aspects PostSharp.Laos.ImplementMethodAspect Replace a method’s content with the advice in the aspect Useful for modifying 3rd party components PostSharp.Laos.CompositionAspect Allows an interface/state to be injected into a component Used to simulate multiple inheritance Examples include Adding .NET Win Form data binding to a POCO Adding Entity Framework interfaces to a POCO
- 24. References PostSharp - David Ross Introduction to AOP with PostSharp - Michael D. Hall What Is PostSharp? - http://www.postsharp.org Using AOP and PostSharp to Enhance Your Code: Part A - Doron's .NET Space PostSharp - Lightweight Aspect-Oriented System - http://www.rainsts.net/
- 25. Learn more... http://www.postsharp.org/ http://davybrion.com/blog/category/postsharp/ http://www.codeplex.com/ValidationAspects http://www.eclipse.org/aspectj/doc/released/progguide/