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.
Degrees of freedom analysis
déc 1st, 2009
The concept of degrees of freedom looks so relevant to software development that I am wondering why it is not considered more often. Fortunately Michael L. Perry dedicates a full section of his blog to that concept. In this post I will quote a lot, please consider that as a sign of enthusiasm.
A common concept [...]
How I became enthusiastic about patterns
oct 1st, 2009
In my very first job, I was doing R&D, working on a map-matching algorithm. The goal of this algorithm was to pinpoint a moving car on a vector map, based on the data from various sensors, including a GPS, an electronic compass and the car odometer. Such algorithm was essential for the business of the [...]
The Self-descriptiveness pattern
sept 4th, 2009
The Self-Descriptiveness pattern can save your life many times in the course of any software project. The power behind it is to harness the computer, rather than yourself.
What is Self-Descriptiveness?
Self-Descriptiveness is a property of any system that is able to describe itself with no external help. Just ask it “describe yourself” and it will. In [...]
Patterns as another kind of types
sept 3rd, 2009
Patterns represent a couple (intent, solution), where the intent matters most. Based on that intents, that can be generic or specialized, I propose to consider patterns like types in languages with strong typing, for the compiler to enforce their constraints.
Declaring patterns: what for?
Consider the very simple Quantity pattern from Analysis Patterns (Fowler):
Represent dimensioned values with [...]
Toward smarter dependency constraints (patterns to the rescue)
août 30th, 2009
Low coupling between objects is a key principle to help you win the battle against software entropy. Making sure your dependencies are under control matters. Several tools can enforce dependencies restrictions, such as JDepend. However in a real project with many classes, packages and modules, the real issue is how to decide and configure the [...]
The more patterns developers know, the most efficient they become within a team: it only takes one or two words (the pattern name) to communicate a design decision or proposal, instead of 10 mn of explanations. Communication also gets much more accurate and to-the-point (or less fuzzy).
Because patterns often form a pattern language, not only [...]
Group together things that go together
oct 19th, 2005
Information hiding is one of the very essential principles of object orientation. If you dont know it well, I suggest you take a look at it on the Web, e-g at UncleBob.
But information hiding is much more than just putting data private through accessors to protect them, it is especially a great tool to manage [...]
My definition of abstraction
avr 11th, 2005
One thing human are particularly pride of is our ability to use abstraction to solve problems. We in software development all know that “another level of abstraction can solve my problem”. But what do you call abstraction ?
Abstract is the opposite of concrete. Concrete things are simply things, the kind of things a dog can [...]
Analysis: don’t make things artificially different
avr 7th, 2005
In any order management systems a quote is not quite different of an order, just a different status of the same entity that is the description of a work to be done (status = POTENTIAL) or done (status = COMPLETED). However I usually find people are tempted to consider they are different concept with no [...]
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All original material of whatever nature created by Cyrille Martraire and included in this weblog and any related page, including the weblog's archive, is licensed under a Creative Commons License.