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Implementation Infrastructure

Overview​

The Implementation Infrastructure pattern ensures a clean separation between interfaces and their actual implementations. This promotes maintainability, testability, and flexibility, allowing multiple implementations to coexist under a well-defined structure.

Why Use This Structure?​

  • Encapsulates Implementation Details – Interfaces remain separate from concrete implementations, preventing direct dependencies on specific classes.
  • Supports Multiple Implementations – Easily switch between different implementations (e.g., mock vs. real implementations).
  • Enhances Testability – Decoupling logic allows for dependency injection and easier unit testing.

Allowed Directory/Package Names​

Package Hierarchy and Responsibilities​

root/
├── service/          # Contains interfaces defining the business logic
│   ├── impl/        # Concrete implementations of the service interfaces
│
├── repository/       # Repository interfaces for data access
│   ├── impl/        # Implementations of repository interfaces (e.g., database interactions)
│
├── adapter/          # External system integrations
│   ├── impl/        # Implementations of adapters (e.g., API clients, event handlers)
│
├── security/         # Security-related interfaces
│   ├── impl/        # Security mechanism implementations (e.g., authentication, authorization)

Recommended Package Naming:

com.company.project.service.*
com.company.project.service.impl.*

com.company.project.repository.*
com.company.project.repository.impl.*

com.company.project.adapter.*
com.company.project.adapter.impl.*

com.company.project.security.*
com.company.project.security.impl.*

##Implementation Notes Interfaces should be placed in the parent directory (e.g., service, repository, adapter).

Concrete Implementations must be stored inside the corresponding impl or implementation package.

Dependency Injection should be used to decouple implementations from their interfaces.

Mock Implementations can be placed under impl.mock for testing environments.

By following the Implementation Infrastructure pattern, projects gain scalability, modularity, and easier dependency management while maintaining a clean architecture.