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LLDsystem_design~12 mins

Dependency injection framework in LLD - Architecture Diagram

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System Overview - Dependency injection framework

A dependency injection framework helps software components get the objects they need without creating them directly. It manages object creation and wiring, making code easier to test and maintain.

Key requirements include managing object lifecycles, resolving dependencies automatically, and supporting different injection types (constructor, setter).

Architecture Diagram
User Code
   |
   v
Dependency Injection Container
   |           
   |---> Service A (depends on Service B)
   |           
   |---> Service B (depends on Repository)
   |           
   |---> Repository (data access)
Components
User Code
client
Requests services from the container without managing dependencies
Dependency Injection Container
service_manager
Creates and injects dependencies automatically based on configuration
Service A
service
Business logic component depending on Service B
Service B
service
Helper service depending on Repository
Repository
data_access
Handles data storage and retrieval
Request Flow - 5 Hops
User Code → Dependency Injection Container
Dependency Injection Container → Service B
Dependency Injection Container → Repository
Dependency Injection Container → Service A
Dependency Injection Container → User Code
Failure Scenario
Component Fails:Dependency Injection Container
Impact:Services cannot be created or injected, causing application failures
Mitigation:Use fallback defaults, error handling, or container redundancy to maintain availability
Architecture Quiz - 3 Questions
Test your understanding
Which component is responsible for creating and injecting dependencies?
ADependency Injection Container
BUser Code
CRepository
DService A
Design Principle
This architecture shows how a dependency injection container manages object creation and wiring, promoting loose coupling and easier testing by separating construction from usage.