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An Introduction to IoC Containers with Castle Windsor

An Introduction to IoC Containers with Castle Windsor. Mike Hadlow mikehadlow@yahoo.com mikehadlow.blogspot.com. What am I going to talk about?. The problem: Application Architecture. What is Inversion of Control? Inversion of Control Container. A Real Application: Suteki Shop.

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An Introduction to IoC Containers with Castle Windsor

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  1. An Introduction to IoC Containers with Castle Windsor Mike Hadlow mikehadlow@yahoo.com mikehadlow.blogspot.com

  2. What am I going to talk about? • The problem: Application Architecture. • What is Inversion of Control? • Inversion of Control Container. • A Real Application: Suteki Shop.

  3. Applications do not scale Complexity Features

  4. Break large pieces into smaller pieces

  5. IoC design style • Systems are composed of small specialised services • Represented by interfaces • Components declare • The services they provide (by implementation) • The services they require (by DI) • Components do not dictate their own lifestyle • Do not implement singleton yourself • Let TDD drive your design

  6. What is an IoC container? • A (very) smart factory • Automatically resolves dependencies • Automatically injects concrete instances • All services are registered in the container • Single point of access for services • Transparent • Various implementations for .NET

  7. Castle MicroKernel / Windsor • Part of the Castle Project castleproject.org • Started by Hamilton Verissimo (Hammett) • Also includes: • MonoRailMVC framework for ASP.NET • ActiveRecordbased on NHibernate

  8. How dependencies are resolved Reporter IReportBuilder IReportSender

  9. Pros? • Simpler component architecture • Reduced cost of change • Easy to unit test • Easily move between application configurations • Ready made configuration (IoC containers)

  10. Cons? • Not another thing to learn? • Higher level of abstraction • Performance? • Lifestyle mistakes can be hard to diagnose

  11. Should I use it? • Already familiar with OO principles and patterns? • Already writing unit tests? • Using a statically typed language? If not, learn how to do these first Don’t impose an IoC container on a team which can’t see its benefit

  12. Resources • Castle Project castleproject.org • Oren Einiayende.com • Krzysztof Koźmickozmic.pl • Alex Henderson bittercoder.com • ALT NET http://tech.groups.yahoo.com/group/altdotnet/

  13. Questions? Mike Hadlow mikehadlow@yahoo.com mikehadlow.blogspot.com

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