NDLI: Parameter-Based Refactoring and the Relationship with Fan-in/Fan-out Coupling

Content Provider	IEEE Xplore Digital Library
Author	Murgia, A. Marchesi, M. Concas, G. Tonelli, R. Counsell, S.
Copyright Year	2011
Abstract	Refactoring is an activity which, in theory, should have minimal impact on the overall structure of a system. That said, certain refactorings change the coupling profile of a system and over time those cumulative changes in coupling can have serious implications for system maintenance effort. In this paper, we analyse effect of the fan-in and fan-out metrics from the perspective of two refactorings -- namely 'Add parameter' to, and 'Remove Parameter' from, a method. We developed a bespoke pattern-matching tool to collect these two refactorings from multiple releases of the Tomcat open-source system using the Evolizer tool to extract method signature data and the JHawk metrics tool to collect the two coupling metrics. Results point to significant differences in the profiles of fan-in and fan-out between refactored and non-refactored classes. We describe how software company can take advantage from this knowledge by defining a priority list of classes which could require a refactoring. A strong over-arching theme emerged: developers seemed to focus on the refactoring of classes with relatively high fan-in and fan-out rather than classes with high values in any one. The study is the first that we know of to analyse the direct effect of a subset of Fowler's refactorings on fan-in and fan-out - relevant metrics of the overall structure of a system.
Starting Page	430
Ending Page	436
File Size	277851
Page Count	7
File Format	PDF
ISBN	9781457700194
e-ISBN	9780769543451
DOI	10.1109/ICSTW.2011.26
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-03-21
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Software testing fan-out Conferences fan-in Helium Refactoring parameters
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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