How Should I Register Objects in My Windsor Container?

Windsor container object registration strategy evaluation

When integrating Windsor into an application, a question arises: who should be responsible for registering objects? This article takes an in-depth look at the various methods and their respective pros and cons.

Registration Strategy

1. Layer-based registration

In this approach, each layer registers its own object. This makes the registration process modular, but can lead to circular dependencies where layers depend on each other's components.

• Advantages:
  • Modular and well organized
  • Simplify testing with isolation layers
• Disadvantages:
  • Circular dependencies may occur
  • Difficulty managing cross-layer dependencies

2. Dependency registration

Here, each layer registers its dependencies. For example, the business layer will register data access components. This eliminates circular dependencies but introduces a more complex registration process.

• Advantages:
  • Avoid circular dependencies
  • Clearer dependency management
• Disadvantages:
  • Configuration is more complex
  • Requires careful coordination between layers

3. Application-based registration

In this case, the application (or test application) registers all objects. This approach centralizes the registration process and simplifies configuration.

• Advantages:
  • Centralized and simple
  • Simplify testing by allowing registration of mock objects
• Disadvantages:
  • May result in lengthy and complex configuration
  • May create dependencies on application modules

Recommended method

Generally, it is recommended to configure the container at the root of the application to ensure maximum modularity. This method is called "combination root".

• For desktop applications this would be done in the Main method.
• For ASP.NET applications, this will happen in Global.asax.
• For WCF this will happen in the ServiceHostFactory.

Testing Best Practices

Testing should not depend on containers. Instead, test doubles can be provided directly to objects and modules. This facilitates container-agnostic design and simplifies testing. Windsor provides "installers" to encapsulate component registration logic, supporting a structured and organized approach.

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