The Castle Windsor Inversion of Control Container

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The Castle Windsor Inversion of Control Container

• Mike Hadlow
• mikehadlow_at_yahoo.com
• mikehadlow.blogspot.com

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Whats wrong with this code?
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IoC Reporter
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We can now test Reporter
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IoC Component Oriented Dev

• Wikipedia says
• Multiple use
• Non context specific
• Composable with other components
• Encapsulated
• A unit of independent deployment and versioning

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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

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Castle MicroKernel / Windsor

• Part of the Castle Project castleproject.org
• Started by Hamilton Verissimo
• Also includes
• MonoRail MVC framework for ASP.NET
• ActiveRecord based on NHibernate

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Reporter with Windsor
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How dependencies are resolved
IReportBuilder
Reporter
IReportSender
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Pros?

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

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Cons?

• Not another thing to learn?
• Higher level of abstraction
• Cant do obfuscation and configuration

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Should I use it?

• Already familiar with OO principles and patterns?
• Already writing unit tests?
• If not, learn how to do these first
• Dont impose an IoC container on a team which
  cant see its benefit

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A Real Application

• http//code.google.com/p/sutekishop/
• http//sutekishop.co.uk/

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Resources

• Castle Project castleproject.org
• Oren Eini ayende.com/blog
• Alex Henderson bittercoder.com

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Questions?

• Mike Hadlow
• mikehadlow_at_yahoo.com
• mikehadlow.blogspot.com