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LLDsystem_design~12 mins

Restaurant, Menu, Order classes in LLD - Architecture Diagram

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System Overview - Restaurant, Menu, Order classes

This system models a restaurant's core operations. It manages the menu items available and processes customer orders. Key requirements include maintaining an up-to-date menu, accepting orders, and tracking order status.

Architecture Diagram
User
  |
  v
Order Service
  |
  v
Menu Service <--> Menu Database
  |
  v
Order Database
Components
User
actor
Customer who browses menu and places orders
Order Service
service
Handles order creation, updates, and status tracking
Menu Service
service
Manages menu items and availability
Menu Database
database
Stores menu item details and prices
Order Database
database
Stores order details and statuses
Request Flow - 10 Hops
User → Order Service
Order Service → Menu Service
Menu Service → Menu Database
Menu Database → Menu Service
Menu Service → Order Service
Order Service → User
User → Order Service
Order Service → Order Database
Order Database → Order Service
Order Service → User
Failure Scenario
Component Fails:Menu Database
Impact:Menu data cannot be retrieved, so users cannot view or place orders based on current menu
Mitigation:Use caching in Menu Service to serve last known menu; alert admins to fix database; degrade gracefully by showing cached menu
Architecture Quiz - 3 Questions
Test your understanding
Which component directly stores the order details?
AOrder Database
BMenu Service
COrder Service
DMenu Database
Design Principle
This design separates concerns by having distinct services for menu management and order processing. It uses databases specialized for their data types and includes caching to improve availability and performance.