🎬 SeatFix System

SeatFix System is a full-fledged backend system for booking movies and events, inspired by the BookMyShow use case. Designed and implemented from scratch, this project demonstrates strong understanding and application of Low-Level Design (LLD), Object-Oriented Principles, Design Patterns, and scalable system development using modern Java and Spring Boot technologies.

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📌 Project Overview

This backend application enables users to:

• Book tickets seamlessly
• Handle concurrent booking scenarios
• Ensure secure authentication and user management

The system was designed with a focus on:

• ⚙️ Scalability
• 🧱 Maintainability
• 🔁 Extensibility
• ✅ Security

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🧠 Key Highlights

✅ Low-Level Design (LLD)

• Created detailed Class Diagrams, Entity-Relationship Diagrams, and Schema Design
• Followed solid Object-Oriented Programming (OOP) principles
• Designed for real-world use cases with scalability in mind

💡 Design Principles Used

• Single Responsibility Principle
• Open/Closed Principle
• Liskov Substitution Principle
• Interface Segregation Principle
• Dependency Inversion Principle

🧰 Design Patterns Applied

• Singleton Pattern: Used for concurrency control during ticket booking (ensuring thread-safety and consistency)

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🛠️ Tech Stack

Layer	Technology / Tool
Language	Java
Framework	Spring Boot
ORM	Hibernate + JPA
Security	Spring Security
Database	MySQL (via MySQL Workbench)
Architecture	MVC (Model-View-Controller)
Password Handling	BCrypt (for hashing passwords)
Exception Handling	Custom Exceptions
Build Tool	Maven / Gradle

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🔐 Security Features

• Integrated Spring Security for authentication and authorization
• Used BCrypt Algorithm for secure password encryption
• Followed best practices for data validation and secure API development

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💬 Features

• User Registration & Login
• View Movies and Event Listings
• Book Tickets (Handles concurrent requests safely)
• Seat Selection and Availability Checking

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📊 Database Design

• Entities: User, Movie, Event, Theater, Screen, Seat, Show, Booking, Payment
• Relationships:
  • One-to-Many: Theater → Screens
  • One-to-Many: Screen → Shows
  • Many-to-Many: Users ↔ Bookings (via Tickets)
  • Show ↔ Seat Mapping for availability

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📈 Scalability & Extensibility

• Designed keeping future scale in mind: microservices ready structure
• Follows Separation of Concerns for easy feature addition and maintenance
• Reusable services and layered architecture (Controller, Service, Repository)

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🧪 Testing & Validation

• Unit tested core services and repository layers
• Exception handling implemented across layers
• Input validations using annotations and custom validators

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🧑‍💻 Author

Shivam Kanaujiya
Backend Developer | LLD Enthusiast | Java & Spring Expert
GitHub Profile
LinkedIn (if applicable)

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🚀 Future Improvements

• Integrate payment gateway (Razorpay / Stripe)
• Implement caching with Redis for show availability
• Add real-time seat locking with WebSockets
• Build frontend using React or Angular
• Convert to microservices architecture

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📁 How to Run

1. Clone the repository
   git clone https://github.com/Sk2k19/Seatifix-System.git

2. Navigate to the project folder
   cd seatfix-system

3. Configure application.properties with your DB credentials

4. Run the application
   ./mvnw spring-boot:run

5. Access the app via Postman or Swagger UI (if enabled)

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🙌 Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

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