Plainionist Become a Better Developer, Deliver Better Software

Implementing Clean Architecture - Of controllers and presenters

From Clean Architectures circles lets take out the 'interface adapters' one and deep dive into controllers and presenters.

Last time we discussed about use cases and interactors and stopped with the question: “Which role is than actually left to the controller and presenter?”

In this post I will take this question up and dive deeper into the world of controllers and presenters in the context of the Clean Architecture.

Read on!

More ...

Clean Architecture and Design

While preparing my next post on Implementing Clean Architecture I watched again Uncle Bobs famous talk on Clean Architecture and Design.

I know it is more than three years old but if you are interested in Clean Architecture you should take your time and watch it. Uncle Bob explains nicely - and a little bit funny as usual ;-) - what the Clean Architecture is about, how the puzzle is built up and why it has to be like this.

And as a summary for this video and as an outlook to my next post here is the key message:

The user interacts with the view. The view passes a request (defined in the interface adapter layer) to the controller which converts it into a request model defined in the use case layer. The interactor takes the request model though a input port and produces a response model which gets passed through an output port to the presenter. The presenter converts the response model into a response object defined in the interface adapters layer to the view. The view renders the response for the user

More ...

An Introduction To Clean Architecture

Today I found a nice article on the NDepend Blog: An Introduction To Clean Architecture.

The post gives a nice introduction by first motivating clean architecture by looking at the short comings of the traditional layered approach. It then gives some history about the Clean Architecture. Finally the post briefly introduces the Clean Architecture itself - the circles and the dependency rule.

It was a nice read - looking forward to read the follow-ups.

More ...

Implementing Clean Architecture - What is a use case?

From Clean Architectures circles lets take out the 'use cases' one and deep dive into it.

Now that my architecture is screaming the business capabilities of my system let’s look at those with more detail.

In the Clean Architecture all the application specific business rules go into the use cases circle.

But what is a use case? How big should it be? How does it interact with its environment?

Read on!

More ...

Implementing Clean Architecture - Make it scream

Update 2022-09-19

I have created a YouTube video explaining in detail how I would setup a project following the Clean Architecture and how I would scale the structure as the code base grows:


How do I make my architecture “scream”?

According to Uncle Bob an architecture “screams” when it clearly expresses its core business purpose. The top level folder structure, the project/DLL names and the namespaces should express business aspects rather than frameworks or other details.

Athena is a web application implemented in ASP.NET MVC. But is this important? I could switch to Ruby on Rails or Node.js - it wouldn’t make any difference for the business. Why do we let such details impact our project structure so often?

More ...

Implementing Clean Architecture - An Overview

Let’s briefly summarize what the Clean Architecture is …

The Clean Architecture consists of multiple layers organized as circles while dependencies are only allowed from outer circles to inner circles. The inner circles contain the business logic. All details, devices and frameworks are in the outer circles.

More ...

How to implement the Clean Architecture?

Did you enjoy reading Uncle Bob’s Clean Architecture?

Book: Clean Architecture

I did! As with every book from Uncle Bob’s it is motivating and inspiring, right?

So let’s take his ideas and realize these in our projects to gain what he is promising!

But how do I start? How do I transform an existing code base - following a layered (web) architecture - into the Clean Architecture?

The Clean Architecture consists of multiple layers organized as circles while dependencies are only allowed from outer circles to inner circles. The inner circles contain the business logic. All details, devices and frameworks are in the outer circles.

More ...

Death by PowerPoint

Are you scared of doing presentations? Especially in front of a bigger audience? You don’t have to! Just don’t do these mistakes …

  1. Using corporate templates
  2. Having content packed slides
  3. Writing full sentences
  4. Focusing on the slides during presentation
More ...

Blogging with Jekyll - SEO

Are you missing readers on your blog? Don’t make this mistake …

… and forget about SEO!

More ...

The second habit

This week I had a discussion with a colleague of mine about stakeholder conform communication. The content of the discussion reminded me about the “2. Habit: Begin with the end in mind”.

This habit is one of seven from Stephen Convey’s great book The 7 Habits of Highly Effective People.

Book: The 7 Habits of Highly Effective People

More ...

MVVM pattern and dialogs

Every now and then I come across questions on how to handle dialogs in MVVM pattern with WPF. Honestly, most of the solution proposals I don’t like as they - from my perspective - somehow “violate” the MVVM pattern.

Here is how I handle dialogs with MVVM pattern …

More ...

Blogging with Jekyll - Legal and privacy

Legal and privacy topics don’t have primary focus on a blog but also such topics are important …

More ...

Blogging with Jekyll - Tags and Series

Now that I have my basic blog running I want to tune it a little bit …

More ...

Blogging with Jekyll - Basics

How did I set up the basics of my blog?

Of course there are endless very good posts out there about Markdown + Jekyll + GitHub Pages and I am not going to repeat what others already have nicely documented. So let me just summarize my setup and referring to others for more detailed explanations.

More ...

Blogging with Jekyll - Introduction

How could one blog the pragmatic, the minimalistic, the “plainionistic” way?

For me the answer is simple: Use the “power of plain text” and write posts in Markdown ;-)

More ...