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 functional programming, Map and Fold are two extremely useful operators, and they belong to every functional language. If the Map and Fold operators are so powerful and essential, how do you explain that we can do our job using Java even though the Java programming language is lacking these two operators? The truth is [...]
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.
Principles for using annotations
déc 14th, 2009
Deciding where and how to place the annotations is not innocent. The last thing we want is to create extra maintenance effort because of the annotations. In other words, we want annotations that are stable, or that change for the same reasons and at the same time than the elements they annotate. This article suggests [...]
Many concepts look obvious because they are used often, not because they are really simple. Small quantities that we encounter all the time in most projects, such as date, time, price, quantity of items, a min and a max… hardly are a subject of interest from developers « as it is obvious that we can represent [...]
Pattern grammar for the variant problem
nov 1st, 2009
For tools to be aware of patterns, the patterns must be formalized, at least partially. At this point I must quote Gregor Hohpe to clarify my thoughts, as I strongly agree with his skipticism: Typically, when people ask me about « codifying » or « toolifying » patterns my first reaction is one of skepticism. Patterns are meant to [...]
Patterns in general, not just design patterns
oct 18th, 2009
Over time, patterns have appeared on many different topics, not all related to programming. Here is a list of patterns and pointers to other lists of patterns, to illustrate two things: Knowledge and experience in general can be packaged into patterns, often using the pattern form. Patterns are convenient for reuse, in any domain. There [...]
In nature, out of every possible arrangement of several elements, only a few arrangements are stable. This is illustrated with atoms combined together, or smaller particles arranged together into atoms, where not every combination is sustainable. Unstable arrangements tend to move toward stable ones over time. Whenever you observe the elements, you mostly see stable [...]
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 [...]
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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.
