Spring par la pratique by Julien Dubois, Jean-Philippe Retaille, Thierry Templier

By Julien Dubois, Jean-Philippe Retaille, Thierry Templier

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En l’occurrence, la POA se concentre sur les éléments transversaux, c’est-à-dire ceux qui se trouvent dupliqués ou utilisés dans un grand nombre d’entités, comme les classes ou les méthodes, sans pouvoir être centralisés au sein d’une entité unique avec les concepts classiques. Ainsi, grâce à la notion d’aspects, qui capturent en leur sein les préoccupations transversales, la séparation des préoccupations est nettement améliorée. Avec les EJB, notamment les EJB Entity CMP, un premier niveau de séparation des préoccupations a été atteint.

Nous faisons ici abstraction de la notion d’utilisateur, de la sécurité, de la gestion des transactions, etc. Nous ne nous intéressons pas non plus aux problématiques d’IHM et nous concentrons exclusivement sur la modélisation des todos et de leurs listes, ainsi que des fonctions permettant de gérer ces deux entités. Dans ce contexte fonctionnel simplifié à l’extrême, les todos se présentent sous la forme d’une structure de données comportant les informations suivantes : • identifiant ; • date de création ; • description ; • priorité ; • indicateur de réalisation de la chose à faire ; • date de réalisation prévue ; • date de réalisation effective.

Et n’apparaissent plus dans le code métier. La maintenance en est d’autant facilitée. La POA va au-delà en offrant des mécanismes génériques pour modulariser un grand nombre d’éléments transversaux des logiciels. Les limites des outils de POA pour capturer les préoccupations transversales tiennent essentiellement à leur capacité à exprimer le périmètre de celles-ci et à la façon dont elles sont liées au reste de l’application. Spring n’implémente pas toutes les notions de la POA, mais l’essentiel est présent et facilement utilisable.

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