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LLDsystem_design~12 mins

Domain-Driven Design basics in LLD - Architecture Diagram

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System Overview - Domain-Driven Design basics

Domain-Driven Design (DDD) helps build software by focusing on the core business ideas. It breaks down complex systems into smaller parts called domains and subdomains. The goal is to create clear boundaries and models that match real-world business needs.

Architecture Diagram
User
  |
  v
Application Layer
  |
  v
Domain Layer <--> Infrastructure Layer
  |
  v
Database

Legend:
- Application Layer: Handles user requests and coordinates tasks
- Domain Layer: Contains business logic and rules
- Infrastructure Layer: Manages technical details like database access
- Database: Stores persistent data
Components
User
actor
Interacts with the system by sending requests
Application Layer
service
Coordinates tasks and handles user requests
Domain Layer
service
Contains business logic and domain models
Infrastructure Layer
service
Handles technical details like database and external services
Database
database
Stores persistent data for the domain
Request Flow - 8 Hops
User → Application Layer
Application Layer → Domain Layer
Domain Layer → Infrastructure Layer
Infrastructure Layer → Database
Database → Infrastructure Layer
Infrastructure Layer → Domain Layer
Domain Layer → Application Layer
Application Layer → User
Failure Scenario
Component Fails:Database
Impact:Data cannot be read or written, causing business operations to fail
Mitigation:Use database replication and backups; cache recent data in Infrastructure Layer to serve reads temporarily
Architecture Quiz - 3 Questions
Test your understanding
Which layer contains the core business rules in Domain-Driven Design?
AApplication Layer
BInfrastructure Layer
CDomain Layer
DDatabase
Design Principle
Domain-Driven Design separates concerns by organizing software into layers that reflect business concepts and technical details. This clear separation helps teams focus on the domain logic while managing infrastructure independently, improving maintainability and scalability.