Dependency Injection Container

Dependency Injection Container

Build a simple dependency injection container that manages service lifetimes and resolves dependencies.

Recommended Prerequisites

Complete these exercises first for the best learning experience:

• ○Clean Architecture Layers

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Background

A Dependency Injection (DI) Container (or IoC Container) manages service creation and lifecycle:

• Factory Registration: Register factories that know how to create services
• Singleton Lifetime: Same instance returned for all requests
• Transient Lifetime: New instance created each time
• Dependency Resolution: Container can resolve dependencies recursively

This pattern decouples service construction from usage and centralizes configuration.

Your Task

Implement a DI container with:

1. Register - Register a factory function for creating services
2. RegisterSingleton - Register a pre-created singleton instance
3. Resolve - Get a service by name (creating it if needed)
4. Support for different service lifetimes

Simple DI Container

~30 minhard

Implement dependency injection container with singleton and factory patterns

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Key Concepts

• Service Container: Central registry for managing object creation and dependencies
• Factory Pattern: Functions that encapsulate object creation logic
• Singleton Lifetime: One instance shared across all requests
• Transient Lifetime: New instance created each time
• Dependency Resolution: Container recursively resolves dependencies when creating services