Service Container

• Explain dependency construction and shared services.
• Explain why it reduces manual wiring in page logic.
• Explain lazy loading only when dependencies are actually used.

Default Service Loader

• Config.
• Request and response state.
• Input and URI data.
• Database-related services.
• Binding-related services.

Service loading strategy

• Explain default service loading and application-provided service loaders.
• Explain how custom services are registered.
• Explain how to use the container to only ever have a single instance of each dependency.

Good uses for the container

• Shared infrastructure services.
• Configuration-backed helpers.
• Application-level factories/repositories.

Pitfalls

• Hiding arbitrary dependencies everywhere.
• Treating it as a global registry for unrelated state.

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Now we know how to load services in our page logic, learn how and where to build application classes.