BookLog is a clean, modular .NET backend designed as part of an academic assignment focused on object‑oriented analysis, design principles, and modern architectural patterns. This project represents the starting point of a larger application and demonstrates how to structure a backend using Domain‑Driven Design (DDD), Clean Architecture, SOLID principles, and patterns such as Repository, Factory, and Result.
The goal of this assignment is not to build a full production system, but to create a scalable, maintainable foundation that can be expanded with additional features in future iterations.
BookLog is intended to serve as the backend for an application where users can register accounts, manage their book collections, track reading status, and organize series and volumes. The current implementation focuses on:
Establishing a clean architectural structure
Implementing core domain models
Creating basic user management (register, fetch, list)
Demonstrating proper layering and separation of concerns
Applying design principles in a realistic but controlled scope
The project follows a layered architecture inspired by Clean Architecture / Onion Architecture:
Exposes REST endpoints
Handles request/response models
Performs API‑level validation
Contains use cases (e.g., RegisterUser, GetUser)
Implements orchestration logic
Uses the Result pattern for predictable error handling
Depends only on abstractions
Contains entities, value objects, and domain rules
Defines repository interfaces
Completely independent of infrastructure and frameworks
Implements repositories
Handles database access and external integrations
Depends on Domain and Application, never the other way around
This structure ensures high testability, low coupling, and long‑term maintainability. It also mirrors the architectural reasoning described in the assignment’s design document.
SRP – Each class has a single responsibility
DIP – Higher layers depend on abstractions, not implementations
Separation of Concerns – API, application logic, domain, and infrastructure are clearly separated
Repository Pattern – Abstracts data access
Service Layer Pattern – Encapsulates use‑case logic
Factory Pattern – Creates domain objects consistently
Result Pattern – Provides structured success/error handling
These patterns were chosen because they fit the scope of the assignment and support a clean, pedagogical architecture.
More advanced patterns such as CQRS, Event Sourcing, or Mediator were intentionally not included. They introduce unnecessary complexity for a small‑scale academic project and are better suited for distributed systems or high‑load environments. The goal here is clarity, simplicity, and demonstrating good architectural fundamentals — not over‑engineering.
User Management Register a new user
Fetch a user by ID
List all users
Domain Foundations User aggregate
Value objects
Validation logic
Repository abstractions
This provides a solid base for future features such as book management, series tracking, ratings, and external API integration.
.NET 8
C#
Clean Architecture
Domain‑Driven Design
Dependency Injection
Repository Pattern
This project is not a complete application. It is the initial architectural foundation created for an academic assignment.