Low Level Design Practice

A collection of low-level design implementations exploring system design concepts, OOP principles, and design patterns in C#.

Overview

This repository contains various system design projects implemented from scratch, focusing on:

• Object-Oriented Design (OOP) principles
• SOLID principles
• Design patterns (Strategy, Factory, Singleton, etc.)
• System architecture and scalability
• Real-world problem-solving

Projects

ParkingLot

A comprehensive parking lot management system that demonstrates:

• Models: Vehicle types (Car, Motorcycle, Truck) and parking spot types (Regular, Compact, Oversized)
• Services: Parking management, fare calculation, and ticket generation
• Strategies: Dynamic pricing using the Strategy pattern for peak/off-peak hours
• Design Patterns: Strategy pattern, Factory pattern, and encapsulation

Key Features:

• Multi-level parking lot support
• Vehicle entry/exit tracking
• Dynamic fare calculation
• Parking spot availability management

Project Structure

Low Level Design/
├── .gitignore              # Global C# ignores
├── .gitattributes          # Line ending configuration
├── README.md               # This file
└── ParkingLot/             # Parking lot system project
    ├── Models/             # Data models
    │   ├── ParkingSpot/    # Spot types
    │   ├── Vehicle/        # Vehicle types
    │   └── Ticket.cs       # Ticket model
    ├── Services/           # Business logic
    │   ├── ParkingManager.cs
    │   ├── ParkingLot.cs
    │   └── FareCalculator.cs
    ├── Strategies/         # Strategy implementations
    │   ├── IFareStrategy.cs
    │   ├── BaseFareStrategy.cs
    │   └── PeakHoursFareStrategy.cs
    ├── Program.cs
    ├── ParkingLot.csproj
    └── README.md

Getting Started

Prerequisites

• .NET 10.0 or higher
• Visual Studio Code or Visual Studio
• Git

Running a Project

# Navigate to the project directory
cd ParkingLot

# Run the application
dotnet run

# Build the project
dotnet build

# Run tests (if available)
dotnet test

Technology Stack

• Language: C# 12+
• Framework: .NET 10.0+
• Architecture: Object-Oriented Design

Design Patterns Used

Parking Lot System

• Strategy Pattern: For different fare calculation strategies
• Factory Pattern: For creating parking spots and vehicles
• Encapsulation: Data hiding and abstraction
• Interface Segregation: Separate interfaces for different concerns

Contributing

To add a new low-level design project:

1. Create a new directory at the root level
2. Add a README.md describing the project
3. Implement using SOLID principles and design patterns
4. Update this root README with the project details

Resources

Design Principles

• SOLID Principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion)
• DRY (Don't Repeat Yourself)
• YAGNI (You Aren't Gonna Need It)

Learning References

• Refactoring and Design Patterns
• Clean Code practices
• System Design interviews

Git Workflow

This repository uses a centralized git structure with:

• Root-level .gitignore applying to all projects
• .gitattributes for consistent line endings across platforms
• All projects tracked in a single repository

License

This repository is for educational purposes. Feel free to use and modify for learning.

Author

Arvind - Low Level Design Practice Repository