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14th IEEE International Working Conference on Source Code Analysis and Manipulation (SCAM)

作者： Szoke, Gabor Antal, Gabor Nagy, Csaba Ferenc, Rudolf Gyimothy, Tibor Univ Szeged Dept Software Engn Szeged Hungary

ISBN: (纸本)9780769553047

The quality of a software system is mostly defined by its source code. Software evolves continuously, it gets modified, enhanced, and new requirements always arise. If we do not spend time periodically on improving our source code, it becomes messy and its quality will decrease inevitably. Literature tells us that we can improve the quality of our software product by regularly refactoring it. But does refactoring really increase software quality? Can it happen that a refactoring decreases the quality? Is it possible to recognize the change in quality caused by a single refactoring operation? In our paper, we seek answers to these questions in a case study of refactoring large-scale proprietary software systems. We analyzed the source code of 5 systems, and measured the quality of several revisions for a period of time. We analyzed 2 million lines of code and identified nearly 200 refactoring commits which fixed over 500 coding issues. We found that one single refactoring only makes a small change (sometimes even decreases quality), but when we do them in blocks, we can significantly increase quality, which can result not only in the local, but also in the global improvement of the code.

关键词： refactoring software quality maintainability coding issues antipatterns ISO/IEC 25010

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Empirical study on refactoring large-scale industrial systems and its effects on maintainability

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JOURNAL OF SYSTEMS AND SOFTWARE 2017年 129卷 107-126页

作者： Szoke, Gabor Antal, Gabor Nagy, Csaba Ferenc, Rudolf Gyimothy, Tibor Univ Szeged Dept Software Engn Szeged Hungary

Software evolves continuously, it gets modified, enhanced, and new requirements always arise. If we do not spend time occasionally on improving our source code, its maintainability will inevitably decrease. The literature tells us that we can improve the maintainability of a software system by regularly refactoring it. But does refactoring really increase software maintainability? Can it happen that refactoring decreases the maintainability? Empirical studies show contradicting answers to these questions and there have been only a few studies which were performed in a large-scale, industrial context. In our paper, we assess these questions in an in vivo context, where we analyzed the source code and measured the maintainability of 6 large-scale, proprietary software systems in their manual refactoring phase. We analyzed 2.5 million lines of code and studied the effects on maintainability of 315 refactoring commits which fixed 1273 coding issues. We found that single refactorings only make a very little difference (sometimes even decrease maintainability), but a whole refactoring period, in general, can significantly increase maintainability, which can result not only in the local, but also in the global improvement of the code. (C) 2016 Elsevier Inc. All rights reserved.

关键词： Refactoring Software quality Maintainability coding issues Antipatterns ISO/IEC 25010

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FaultBuster: An Automatic Code Smell Refactoring Toolset 15

FaultBuster: An Automatic Code Smell Refactoring Toolset

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15th IEEE International Working Conference on Source Code Analysis and Manipulation (SCAM)

作者： Szoke, Gabor Nagy, Csaba Fulop, Lajos Jeno Ferenc, Rudolf Gyimothy, Tibor Univ Szeged Dept Software Engn Szeged Hungary

ISBN: (纸本)9781467375290

One solution to prevent the quality erosion of a software product is to maintain its quality by continuous refactoring. However, refactoring is not always easy. Developers need to identify the piece of code that should be improved and decide how to rewrite it. Furthermore, refactoring can also be risky;that is, the modified code needs to be re-tested, so developers can see if they broke something. Many IDEs offer a range of refactorings to support so-called automatic refactoring, but tools which are really able to automatically refactor code smells are still under research. In this paper we introduce FaultBuster, a refactoring toolset which is able to support automatic refactoring: identifying the problematic code parts via static code analysis, running automatic algorithms to fix selected code smells, and executing integrated testing tools. In the heart of the toolset lies a refactoring framework to control the analysis and the execution of automatic algorithms. FaultBuster provides IDE plugins to interact with developers via popular IDEs (Eclipse, Netbeans and IntelliJ IDEA). All the tools were developed and tested in a 2-year project with 6 software development companies where thousands of code smells were identified and fixed in 5 systems having altogether over 5 million lines of code.

关键词： Automatic refactoring code smells coding issues antipatterns SourceMeter Columbus

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SourceMeter SonarQube plug-in 14

SourceMeter SonarQube plug-in

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14th IEEE International Working Conference on Source Code Analysis and Manipulation (SCAM)

作者： Ferenc, Rudolf Lango, Laszlo Siket, Istvan Gyimothy, Tibor Bakota, Tibor Univ Szeged Dept Software Engn H-6720 Szeged Hungary FrontEndART Software Ltd H-6722 Szeged Hungary

ISBN: (纸本)9780769553047

The SourceMeter SonarQube plug-in is an extension of SonarQube, an open-source platform for managing code quality made by SonarSource S.A, Switzerland. The plug-in extends the built-in Java code analysis engine of SonarQube with FrontEndART's high-end Java code analysis engine. Most of SonarQubes original analysis results are replaced (including the detected source code duplications), while the range of available analyses is extended with a number of additional metrics and issue detectors. Additionally, the plug-in offers new GUI features on the SonarQube dashboard and drill-down views, making the SonarQube user experience more comfortable and the work with the tool more productive.

关键词： SourceMeter SonarQube plug-in software quality metrics clone detection coding issues

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Designing and Developing Automated Refactoring Transformations: An Experience Report 23

Designing and Developing Automated Refactoring Transformatio...

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23rd IEEE International Conference on Software Analysis, Evolution, and Reengineering (SANER)

作者： Szoke, Gabor Nagy, Csaba Ferenc, Rudolf Gyimothy, Tibor Univ Szeged Dept Software Engn Szeged Hungary Refactoring 2011 Ltd Budapest Hungary

ISBN: (纸本)9781509018550

There are several challenges which should be kept in mind during the design and development phases of a refactoring tool, and one is that developers have several expectations that are quite hard to satisfy. In this report, we present our experiences of a two-year project where we attempted to create an automatic refactoring tool. In this project, we worked with five software development companies that wanted to improve the maintainability of their products. The project was designed to take into account the expectations of the developers of these companies and consisted of three main stages: a manual refactoring phase, a tool building phase, and an automatic refactoring phase. Throughout these stages we collected the opinions of the developers and faced several challenges on how to automate refactoring transformations, which we present and summarize.

关键词： Automated Refactoring Code Smells coding issues Software Maintenance

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Do Automatic Refactorings Improve Maintainability? An Industrial Case Study 31

Do Automatic Refactorings Improve Maintainability? An Indust...

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IEEE 31st International Conference on Software Maintenance and Evolution (ICSME)

作者： Szoke, Gabor Nagy, Csaba Hegedus, Peter Ferenc, Rudolf Gyimothy, Tibor Univ Szeged Dept Software Engn Szeged Hungary

ISBN: (纸本)9781467375320

Refactoring is often treated as the main remedy against the unavoidable code erosion happening during software evolution. Studies show that refactoring is indeed an elemental part of the developers' arsenal. However, empirical studies about the impact of refactorings on software maintainability still did not reach a consensus. Moreover, most of these empirical investigations are carried out on open-source projects where distinguishing refactoring operations from other development activities is a challenge in itself. We had a chance to work together with several software development companies in a project where they got extra budget to improve their source code by performing refactoring operations. Taking advantage of this controlled environment, we collected a large amount of data during a refactoring phase where the developers used a (semi) automatic refactoring tool. By measuring the maintainability of the involved subject systems before and after the refactorings, we got valuable insights into the effect of these refactorings on large-scale industrial projects. All but one company, who applied a special refactoring strategy, achieved a maintainability improvement at the end of the refactoring phase, but even that one company suffered from the negative impact of only one type of refactoring.

关键词： automatic refactoring software maintainability coding issues ISO/IEC 25010

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Challenges of SonarQube Plug-In Maintenance 26

Challenges of SonarQube Plug-In Maintenance

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26th IEEE International Conference on Software Analysis, Evolution and Reengineering (SANER)

作者： Barta, Bence Manz, Gunter Siket, Istvan Ferenc, Rudolf Univ Szeged Dept Software Engn Arpad Ter 2 H-6720 Szeged Hungary FrontEndART Software Ltd Zaszlo U 3 I-5 H-6722 Szeged Hungary

ISBN: (纸本)9781728105918

The SONARQUBE (TM) platform is a widely used open-source tool for continuous code quality management. It provides an API to extend the platform with plug-ins to upload additional data or to enrich its functionalities. The SourceMeter plug-in for SONARQUBE (TM) platform integrates the SourceMeter static source code analyzer tool into the SONARQUBE (TM) platform, i.e., uploads the analysis results and extends the GUI to be able to present the new results. The first version of the plug-in was released in 2015 and was compatible with the corresponding SONARQUBE (TM) version. However, the platform - and what is more important, its API - have evolved a lot since then, therefore the plug-in had to be adapted to the new API. It was not just a slight adjustment, though, because we had to redesign and reimplement the whole UI and, at the same time, perform significant alterations in other parts of the plug-in as well. Besides, we examined the effect of the API evolution on other open-source plug-ins and found that most of them still remain compatible with the latest version, even if they have not been updated alongside the underlying API modifications. The reason for this is that these plug-ins use only a small part of the API that have not changed over time.

关键词： SourceMeter SonarQube plug-in API evolution software quality metrics clone detection coding issues

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