It is not uncommon to oppose the empirical process of TDD, together with its heavy use of unit tests, to the more mathematically based techniques, with the »formal methods » and formal verification at the other end of the spectrum. However I experienced again recently that the process of TDD can indeed help discover and draw upon [...]
There’s a metaphor I had in mind for a long time when thinking about software design: because I’m proudly lazy, in order to make the code smaller and easier to learn, I must do my best to reduce the « surface-area over volume ratio » of the software. Surface-area over volume ratio? I like the Surface-area over volume [...]
The untold art of Composite-friendly interfaces
avr 19th, 2011
The Composite pattern is a very powerful design pattern that you use regularly to manipulate a group of things through the very same interface than a single thing. By doing so you don’t have to discriminate between the singular and plural cases, which often simplifies your design. Yet there are cases where you are tempted [...]
In the first part of this article we introduced predicates, which bring some of the benefits of functional programming to object-oriented languages such as Java, through a simple interface with one single method that returns true or false. In this second and last part, we’ll cover some more advanced notions to get the best out [...]
You keep hearing about functional programming that is going to take over the world, and you are still stuck to plain Java? Fear not, since you can already add a touch of functional style into your daily Java. In addition, it’s fun, saves you many lines of code and leads to fewer bugs. What is [...]
Key insights that you probably missed on DDD
sept 22nd, 2010
As suggested by its name, Domain-Driven Design is not only about Event Sourcing and CQRS. It all starts with the domain and a lot of key insights that are too easy to overlook at first. Even if you’ve read the « blue book » already, I suggest you read it again as the book is at the [...]
Patterns for using custom annotations
juil 12th, 2010
If you happen to create your own annotations, for instance to use with Java 6 Pluggable Annotation Processors, here are some patterns that I collected over time. Nothing new, nothing fancy, just putting everything into one place, with some proposed names.
Domain-Driven Design encourages to analyse the domain deeply in a process called Supple Design. In his book (the blue book) and in his talks Eric Evans gives some examples of this process, and in this blog in several parts I will suggest some sources of inspirations and some recommendations drawn from my practice in order to help about this process.
Your cross-cutting concerns are someone else core domain
déc 22nd, 2009
Consider a domain, for example an online bookshop project that we call BuyCheapBooks. The Ubiquitous Language for this domain would talk about Book, Category, Popularity, ShoppingCart etc. Business Domains From scratch, coding this domain can be quite fast, and we can play with the fully unit-tested domain layer quickly. However if we want to ship, [...]
Big battles are won on small details
déc 17th, 2009
Small details matter because you deal with them often. Any enhancement you make thus yields a benefit often, hence a bigger overall benefit. In other words: invest small care, get big return. This is an irresistible proposal! Examples of small design-level details that I care about because I have experienced great payback from them: Using [...]
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