Dependency Injection And Ioc Containers
•Download as PPTX, PDF•
3 likes•1,794 views
These slides are from my presentation at the January 2010 Chicago Architects Group meeting on Dependency Injection and Inversion of Control Containers
Report
Share
Dependency Injection And Ioc Containers
- 1. Dependency Injection And IOC ContainersTim MurphyTechnical Specialist - PSC Group, LLC
- 2. The Pursuit of the Loosely Coupled System
- 3. Traditional Object StructureDatabase Access ServiceEntityDatabase Access Service
- 6. Etc..Service ProxyLogging ServiceTightly coupled services!
- 7. Doesn’t promote reusability
- 9. Difficult to “mock” makes testing difficultWith Dependency Injection
- 10. The End(or is it)
- 11. Better….… but still a lot of workThere are so many dependencies in this system, how do I manage them all?
- 12. Dependency InjectionWith a Factory PatternEntity“I need to be created, including have all my services crated and given to me.”Object Factory “ I know how to build all of this stuff.”Create aConcrete instanceCreate anEntity for meInstance forapplicationApplication“I need an Entity, but I don’t know how to create it.”
- 13. I want to spend my day writing functional business code, NOT a bunch of plumbing code…
- 14. Dependency Injection Frameworks to the Rescue!Structure MapNinjectWindsor Microsoft Unity
- 15. With a Dependency Injection/ IOC FrameworkEntityDatabase Access Service
- 16. Service Proxy
- 17. Logging Service
- 18. Etc..Application“I need a concrete instance of an Entity…”Provider“You tell me what type of object you want, I give you the object you need:”Container“You ask me for objects, I create them based on my registrations”
- 19. DEMO TIME!
- 20. Related TopicsMicrosoft Provider ModelMicrosoft Extensibility Framework (MEF)
- 21. Some helpful links…Martin Fowler martinfowler.com/articles/injection.htmlMSDN Article on Dependency Injection patternhttp://tinyurl.com/bm8wm5Dependancey Injection tutorialhttp://tinyurl.com/5fysrq
- 22. Some helpful links…DI/IOC Frameworks:Ninject.orgStructureMap.Sourceforge.netwww.castleproject.org/container/index.htmlUnity (tinyurl.com/cm9pe3)