Skip to main content

Layered Infrastructure

Overview​

The Layered Infrastructure pattern structures code into clearly defined layers, making it modular, maintainable, and scalable. Each layer has a distinct responsibility, ensuring better organization and separation of concerns.

Why Use This Structure?​

  • Separation of Concerns – Each layer has a dedicated role, improving maintainability.
  • Scalability – Allows teams to expand functionality with minimal impact on other layers.
  • Testability – Components are isolated, making unit and integration testing easier.

Allowed Directory/Package Names​

Below is the expected directory/package structure for this setup:

root/
├── controller/       # Handles API endpoints and user interactions
├── service/          # Business logic and application orchestration
├── dto/             # Data Transfer Objects for communication between layers
├── model/           # Domain models representing business entities
├── repository/      # Manages data access and interactions with the database
├── dao/             # Data Access Objects for lower-level database operations
├── middleware/      # Handles request processing before reaching controllers
├── exception/       # Centralized exception handling
├── enums/           # Stores enumerations for maintaining consistent values
├── property/        # Configuration and properties management
├── helper/          # Utility classes specific to the application domain
├── utility/         # General utility classes and reusable functions
├── util/            # Alternative location for general utilities
└── infrastructure/   # External services, persistence, and system interactions

Or for package naming:

com.company.project.controller.*
com.company.project.service.*
com.company.project.dto.*
com.company.project.model.*
com.company.project.repository.*
com.company.project.dao.*
com.company.project.middleware.*
com.company.project.exception.*
com.company.project.enums.*
com.company.project.property.*
com.company.project.helper.*
com.company.project.utility.*
com.company.project.util.*

Implementation Notes​

  • Controllers should only handle request processing and delegate logic to services.

  • Services contain business logic and should not depend on controllers.

  • DTOs should be used to transfer data instead of exposing domain models.

  • Repositories and DAOs should separate high-level and low-level database interactions.

  • Middleware is useful for handling authentication, logging, and request filtering.

  • Utility & Helper classes should avoid business logic and focus on reusable functionalities.

By following the Layered Infrastructure pattern, teams can build well-structured, scalable, and maintainable applications while enforcing clear boundaries between responsibilities.