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Justified Code/Hexagonal Architecture Pattern

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Hexagonal Architecture Pattern

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Software systems are often built around technology choices, causing business logic to leak into databases and UIs. The result is a tightly coupled architecture that becomes hard to modernize. This document explores how the Hexagonal Architecture pattern helps teams build systems that can absorb changes gracefully, supported by a practical example: executing a money transfer in an online banking system.

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Clean designs gradually decay into a messy code structure.

System Design Diagrams

To give you an idea on what you will learn, i am listing some of the diagrams taken from the guide.

The Problem

Business rules leak into UI code, core logic depends directly on databases, frameworks, and vendor SDKs, Replacing infrastructure code becomes nearly impossible.

The Solution

Hexagonal Architecture, also known as Ports and Adapters, was introduced by Alistair Cockburn to isolate the domain logic of an application from code that integrates with UIs, external APIs, databases, and message brokers.

Use Case Example – Transfer Money

Hexagonal architecture keeps the business rules (domain) isolated from delivery channels (Rest Api) and infrastructure (storage, payment, notification).

Contents

PDF Files

Hexagonal Architecture Pattern V1.0.pdf
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