hexagonal-architecture

Hexagonal architecture is a software design pattern that decouples application logic from external frameworks and technologies. By ensuring dependencies point inward, it creates a technology-agnostic core that significantly improves code modularity, maintainability, and testability.

To refactor a monolithic application using hexagonal architecture, review the core components and dependency flow, then separate your application logic from external services. This ensures your core logic becomes framework-independent, improving overall maintainability and scalability.

Use hexagonal architecture for application architecture when modularity, maintainability, and testability are critical. It is particularly effective when you need to solve challenges with tightly coupled application logic that makes your code difficult to test and maintain.

Hexagonal architecture focuses on decoupling application logic from external technologies rather than mandating specific frameworks. While dependency injection helps manage the inward dependency flow, the core principle relies on structural code organization to maintain a technology-agnostic core.

The best way to structure dependencies in hexagonal architecture is ensuring they always point inward toward the application core. This structural design prevents external frameworks and technologies from leaking into your core logic, keeping your application technology-agnostic and highly testable.

Tightly coupling application logic to external services makes testing difficult because changes in external frameworks directly impact core functionality. Hexagonal architecture solves this by decoupling logic from external dependencies, allowing isolated testing of the technology-agnostic core.