aditisutar / lms

Library Management System

LMS

This project is a Library Management System implemented in Java.

Features Add, update, and delete books Add, update, and delete users Borrow and return books Search for books by ISBN, title, or author Track available and borrowed books Log all operations

Entities Book entity User entity Transaction entity

Services Book service- It is responsible for managing book-related operations like add/update/delete books, search a book, list of available/borrowed books User service- It is responsible for managing user-related operations like add/update/delete user. Transaction service- Handles borrowing/returning of book and maintains a history of transactions.

The code provided follows several SOLID principles

1. Single Responsibility Principle (SRP) BookService, UserService, and TransactionService each have a single responsibility:

2. Open/Closed Principle (OCP) By using interfaces (LibraryService, BookService, UserService, TransactionService), the system allows new functionalities to be added by implementing these interfaces.

3. Liskov Substitution Principle (LSP) The BookService interface and its implementation BookServiceImpl follow this principle. You can replace BookServiceImpl with another implementation of BookService without affecting the system's behavior and similarly UserService and TransactionService

4. Interface Segregation Principle (ISP) The code defines multiple specific interfaces (BookService, UserService, TransactionService, LibraryService, SearchFunctionality) rather than one large interface. Each interface has methods relevant to its specific purpose.

5. Dependency Inversion Principle (DIP) High-level modules (e.g., Book) depend on abstractions (interfaces like BookService, UserService, TransactionService) rather than concrete implementations.