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Book: Domain Driven Design

When I first started to work, I knew I was doing crap. Yep, really. We were using old stuff, copy/pasting heavily, editing config files by hand before deploying in production and so on. However, knowing you do crap doesn’t help you doing right, even if you had the occasion.

As time went by, however, I was lucky enough to work with real Software Developers, craftsmen as we would say today, learning a lot on the way.

Yet, even these bright guys were sometimes uneasy. Not on technical stuff, not on infrastructure, but, well, you know, on the classes and the like you’ve to do for your customer. How shall we split the different parts of the requirements? What should be top level code or just « code that works », intended not to be touched more afterwards. To which extend shall we integrate what’s the business requires, or shall we adapt it a bit to our stuff ?

Yet, these foggy stuff are the value of an application. Customers don’t care too much about how nice your XML described UI is. Nor does he care too much about maven and the like. He cares about these (often messy) code doing what he asked for. The code which enables dealership to get their good in time. The code which triggers automatically some buy on some mutual funds. The code which allows to display the breaking news. The user’s code. And on top of that, whatever the nice technical layers around, if the users’ domain is badly understood and/or translated into code, then it’ll be a mess and massive pain to work with.

Domain Driven Design is all about this code which actually is, or at least should be, the heart of your application. This « domain » code is where the real value is. Ṫhe book makes the obvious visible again: the domain, the users’ stuff, is what matters. Even better, the books describes plenty of means to handle this part of your application, from quite low lever to high ones. How to handle large domain. How to refactor towards greater insight (a chapter title actually). It even has a chapter called Strategic Design, speaking about how to handle these different domains which always coexist, and how to make the best of them. Most important of all, the books is all about the UBIQUITOUS LANGUAGE.

The uppercase is not mistake: the UBIQUITOUS LANGUAGE is what allows users and developers to understand each other effectively and over time. It matters. The UBIQUITOUS LANGUAGE deserves its uppercase. And by doing so constantly in the book, with the core concepts, Eric Evans makes it obvious what matters or not. After reading the book all these big uppercase words will stick to your mind with ease. ANTI CORRUPTION LAYER. REPOSITORIES. BOUNDED CONTEXT. They’re all still there 🙂

To tell more about the UBIQUITOUS LANGUAGE, it’s the language used to describe the domain, both by the users and the developers. It is should be reflected in the code. And, of the highest importance, is should evolve with the comprehension of the needs. This is the domain. This is the added value of your work. Eric Evans takes care of showing ways to handle this UBIQUITOUS LANGUAGE and make it pervasive and effective. His examples are clearly first hand ones, which smell and look like what you could expect tomorrow (or on Monday rather lol). No big word on SOA or Agile Manifesto. No, just how to make your users needs properly fulfilled. On top of that, the author speaks of organization at the code level and higher ones (like what to do with big blobs of codes or legacy systems). This uncommon « elevation » is very nice and helpful. Speaking of more than the GOF patterns as a way to make your code base intelligible is very nice. In fact, the book’s title second part « Tackling Complexity in the Heart of Software », is true and right to the topic.

I guess you got it, I liked this book. It makes you think and ponder often, on your current practices and on « industry wide » ones. Like the habit of affecting the best developers to the infrastructure teams. Common isn’t it ? These top notch guys can then develop some stack able to solve both desktops and web needs, transparently and recursively. Sounds all good, but is this what your users want ? They want their needs fulfilled, they want their reality to be tackled. And whatever your bells and whistles, if you can’t move stuff Y to point 1243, it’s no help.

Well, I fear I’m too verbose. By the way, the book is quite verbose as well. More than 500 pages and extensive texts. Reading it took quite some time, even if I liked it. It was just big, both in volume of text and on impact of its content. But it didn’t go in the way, apart that at the end I was wondering about stuff explain at the beginning. But then, no big deal: for sure I’ll read it again.

To kind of conclude, this book is the last bit of theory I was missing towards making great software, in the long run, in a sustainable way, for the users. It has already changed the way I approach design and it looks like my users felt and liked it already.

I already said too much: I’m off !


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  1. février 11, 2014 à 10:31

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