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Livre blanc : Maîtrisez votre dette technique. Le 4 Juin 1996, à 9h35 le vol 501 de la fusée Ariane 5 effectue son premier décollage.

Livre blanc : Maîtrisez votre dette technique

Quelques secondes plus tard, le système de guidage inertiel reçoit trop d’informations et se met hors service, car reconnu défaillant. L’ordinateur de bord est alors notifié qu’un dysfonctionnement est en cours et compromet les informations concernant la trajectoire de la fusée. Cette modification de la trajectoire entraîne l’arrachage d’un moteur d’appoint, déclenchant l’auto destruction de la fusée. Des analyses plus approfondies ont démontré que le système de guidage inertiel est lui même la cause de cet échec.

Conçu à l’époque pour Ariane 4, il n’était plus nécessaire pour Ariane 5. Au-delà du caractère spectaculaire de cet exemple, il est intéressant de noter que l’origine du dysfonctionnement réside dans un module développé pour une version antérieure de la fusée et devenu obsolète. Télécharger le Livre blanc « Maîtrisez votre dette technique ». Relating Category Theory to Programming Language Theory. The most immediately obvious relation to category theory is that we have a category consisting of types as objects and functions as arrows.

Relating Category Theory to Programming Language Theory

We have identity functions and can compose functions with the usual axioms holding (with various caveats). That's just the starting point. One place where it starts getting deeper is when you consider polymorphic functions. The Principles of Good Programming. Heron-Centric: Ruminations of a Language DesignerThe Principles of Good Programmingby Christopher DigginsJuly 24, 2011 Today's post is a lightly edited repost from my blog at The Area, a web-site dedicated to users of Autodesk media and entertainment products.

The Principles of Good Programming

I came up with this list of principles to help with a recent C# training I gave, and I thought that members of the community could appreciate these principles and have some interesting insights to share. The principles of good programming are closely related to principles of good design and engineering. The following programming principles have helped me over the years become a better programmer, and I believe can help any developer become more efficient and to produce code which is easier to maintain and that has fewer defects. Regular Expressions in Programming Environment. Regular expressions are a way of describing patterns of text that can be useful for processing text documents or when looking for a pattern and possibly replacing it with another.

Regular Expressions in Programming Environment

Regular expressions are a very powerful tool indeed, and the best thing is that they go beyond just one programming language or tool. You’ll find Regex enabled applications everywhere. File renaming tools might use Regex to allow complex renaming operations; most IDEs support it, search tools as well. MongoDB for a large queuing system. Our queuing system is different from others in that it supports dependencies.

MongoDB for a large queuing system

For instance, before one job completes, its four children have to complete first. This allows us to create jobs that are actually trees of items all processing in parallel. On a small scale, things went fairly well. We built the entire system out, and tested and built onto it over the period of a few months. Then came time for production testing. Without a doubt, MongoDB was the biggest bottleneck. This was pretty disappointing. So there’s my advice: don’t use MongoDB for evenly-distributed high-write applications.

On a more positive note, for everything BUT the queuing system (which we did get working GREAT after throwing enough servers at it, by the way) MongoDB has worked flawlessly. TL,DR; MongoDB is awesome. De la performance à l’excellence. MemoryImage. Database · application architecture tags: When people start an enterprise application, one of the earliest questions is "how do we talk to the database".


These days they may ask a slightly different question "what kind of database should we use - relational or one of these NOSQL databases? ".


Harold’s Corollary to Knuth’s Law. Lately I’ve found myself arguing about the proper design of unit tests.

Harold’s Corollary to Knuth’s Law

On my side I’m claiming: Unit tests should only touch the public API. Code coverage should be as near 100% as possible.It’s better to test the real thing than mock objects. The goal is to make sure that the tests are as close to actual usage as possible. This means that problems are more likely to be detected and false positives are less likely.


Contrasting Performance : Languages, styles and VMs – Java, Scala, Python, Erlang, Clojure, Ruby, Groovy, Javascript. Identifying which Java Thread is consuming most CPU. When your workout mainly concentrates of muscle mass growth, then this information has information which will be of usage for you.

Identifying which Java Thread is consuming most CPU

You may need to modify your diet along with working out to get the final results you would like. Check into locations while focusing on aspects of your entire exercise routine exercise that you simply really feel you could utilize help with. Strive for a higher variety of representatives with medium sized-high intensity weight if you train. For each individual exercise one does, try and do a collection of 10 to 15 repetitions, resting less than 1 minute in the middle every single established.

This will cause lactic acid to build up in your muscle tissue, which makes you “notice the burn” although stimulating expansion. Should you be trying to create muscles, it is important to try to eat caloric-thick meals with the best time.


Process. Scala. Tools.