Um método para descoberta automática de regras para a detecção de Bad Smells

• Autor(a) principal: Amorim, Lucas Benevides Viana de
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal de Alagoas (UFAL)
• Texto Completo: http://www.repositorio.ufal.br/handle/riufal/1757
• topic: Inteligência artificial; Engenharia de software; Algorítmos genéticos; Artificial intelligence; Software engineering; Genetic algorithms; CNPQ::CIENCIAS EXATAS E DA TERRA::CIENCIA DA COMPUTACAO

One of the techniques to maintain software quality is code refactoring. But to take advantage of code refactoring, one must know where in code it must be applied. A catalog of bad smells in code has been proposed in the literature as a way to know when a certain piece of code should be refactored andwhat kind of refactoring should be applied. This catalog has been extended by other researchers. However, detecting such bad smells is far from trivial, mainly because of the lack of a precise and consensual definition of each Bad Smell. In this researchwork,we propose a solution to the problemof automatic detection of Bad Smells by means of the automatic discovery of metrics based rules. In order to evaluate the effectiveness of the technique, we used a dataset containing information on software metrics calculated for 4 open source software systems written in Java (ArgoUML, Eclipse,Mylyn and Rhino) and, by means of a Decision Tree induction algorithm, C5.0, we were capable of generating rules for the detection of the 12 Bad Smells that were analyzed in our study. Our experiments show that the generate rules performed very satisfactorily when tested against a separated test dataset. Furthermore, aiming to optimize the proposed approach, a Genetic Algorithm was implemented to preselect the most informative software metrics for each Bad Smell and we show that it is possible to reduce classification error in addition to, many times, reduce the size of the generated rules. When compared to existing Bad Smells detection tools, we show evidence that the proposed technique has advantages.