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April 2025

March 2025

Legacy Code Modernisation - Conserving Behaviour with Approval Tests
Transitioning legacy code to Hexagonal Architecture requires a strong test suite. Approval Tests are a powerful tool to achieve this.
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Oliver Zihler
From Hexagonal- to Clean Architecture
Introduction to Clean Architecture, comparison with Hexagonal Architecture, and incorporation of Domain-Driven-Design Domain Models.
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Oliver Zihler
Towards Hexagonal Architecture - Folder Structure
I present possible folder structures I used in own projects that capture concern separation, Hexagonal Architecture, and Domain-Driven Design…
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Oliver Zihler
Adding Domain-Driven Design to Ports & Adapters - Enriching the Domain Model with Logic
The current codebase, through enriched with stronger types, still is mostly procedural. Let's see how we can combine data and logic to build a much…
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Oliver Zihler

February 2025

Adding Domain-Driven Design to Ports and Adapters - Rich Domain Model vs. DTOs
In this article, I will discuss what types of data structures exist and which ones should contain business logic contributing to a rich domain model and…
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Oliver Zihler
4
Adding Domain-Driven Design to Ports & Adapters - Improving Port Interfaces
Currently, I mainly use primitive data types in port interfaces. Let's improve them by introducing parameter objects with concern- and domain-specific…
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Oliver Zihler
Towards Hexagonal Architecture - Interface Segregation
After examining driven ports for data-access separation and dependency inversion, I will take a closer look at interface segregation, ports on the…
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Oliver Zihler
2

January 2025

Towards Hexagonal Architecture - Dependency Inversion between Business- and Data-Access Concerns
To entirely remove any direct call from the business to the data-access concern, we need to introduce application-specific interfaces that are…
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Oliver Zihler
Towards Hexagonal Architecture - Separating Data-Access- and Business Concerns
Depending on database entity classes in business logic can lead to a big ball of mud over time. Here I will show how to do a clean separation between…
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Oliver Zihler
© 2025 Oliver Zihler
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