Tracking Design Smells: Lessons from a Study of God Classes

Vaucher, Stéphane; Khomh, Foutse; Moha, Naouel et Guéhéneuc, Yann-Gaël (2009). « Tracking Design Smells: Lessons from a Study of God Classes » (Proceedings of the 16th Working Conference on Reverse Engineering (WCRE'09), ) pp. 145-154.

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God class is a term used to describe a certain type of large classes which know too much or do too much. Often a God class (GC) is created by accident as functionalities are incrementally added to a central class over the course of its evolution. GCs are generally thought to be examples of bad code that should be detected and removed to ensure software quality. However, in some cases, a GC is created by design as the best solution to a particular problem because, for example, the problem is not easily decomposable or strong requirements on efficiency exist. In this paper, we study in two open-source systems the life cycle of GCs: how they arise, how prevalent they are, and whether they remain or they are removed as the systems evolve over time, through a number of versions. We show how to detect the degree of godliness of classes automatically. Then, we show that by identifying the evolution of godliness, we can distinguish between those classes that are so by design (good code) from those that occurred by accident (bad code). This methodology can guide software quality teams in their efforts to implement prevention and correction mechanisms.

Type: Communication, article de congrès ou colloque
Informations complémentaires: IRISA/INRIA, University of Rennes 1, France
Déposé par: Naouel Moha
Date de dépôt: 29 janv. 2013 14:12
Dernière modification: 01 nov. 2014 02:24
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