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A Feature Model Based Framework for refactoring Software Product Line Architecture

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Journal of Computer Science & Technology 2016年第5期31卷 951-986页

作者： Mohammad Tanhaei Jafar Habibi Seyed-Hassan Mirian-Hosseinabadi Department of Computer Engineering Sharif University of Technology Tehran 11155-9517 Iran

Software product line （SPL） is an approach used to develop a range of software products with a high degree of similarity. In this approach, a feature model is usually used to keep track of similarities and differences. Over time, as modifications are made to the SPL, inconsistencies with the feature model could arise. The first approach to dealing with these inconsistencies is refactoring. refactoring consists of small steps which, when accumulated, may lead to large-scale changes in the SPL, resulting in features being added to or eliminated from the SPL. In this paper, we propose a framework for refactoring SPLs, which helps keep SPLs consistent with the feature model. After some introductory remarks, we describe a formal model for representing the feature model. We express various refactoring patterns applicable to the feature model and the SPL formally, and then introduce an algorithm for finding them in the SPL. In the end, we use a real-world case study of an SPL to illustrate the applicability of the framework introduced in the paper.

关键词： software product line feature model refactoring software architecture

Automated pattern-directed refactoring for complex conditional statements

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Journal of Central South University 2014年第5期21卷 1935-1945页

作者：刘伟胡志刚刘宏韬杨柳 School of Information Science and Engineering Central South University School of Software Central South University

Complex conditional statement is one of the bad code smells, which affects the quality of the code and design of software. In the proposed approach, two commonly-used design patterns for handling complex conditional statements are selected, and they are the factory method pattern and the strategy pattem. Two pattern-directed refactoring approaches based on the two design patterns are proposed. Each approach contains a refactoring opportunities identification algorithm and an automated refactoring algorithm. After parsing the abstract syntax tree generated from source code, the refactoring opportunities are identified effectively and automatically. Then, for candidate code, refactoring algorithms are executed automatically, which are used to simplify or remove complex conditional statements. By empirical analysis and quality assessment, the code after refactoring has better maintainability and extensibility, and the proposed approach for automated pattern-directed refactoring succeeds to reduce code size and complexity of classes.

关键词： refactoring abstract syntax tree complex conditional statements design patterns factory method pattem strategypattem

Identifying extract class refactoring opportunities for internetware

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Science China(Information Sciences) 2014年第7期57卷 37-54页

作者： CHEN Lin QIAN Ju ZHOU YuMing WANG Peng XU BaoWen State Key Laboratory for Novel Software Technology Nanjing University Department of Computer Science and Technology Nanjing University College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics School of Computer Science and Engineering Southeast University

The quality of internetware software is significantly associated with class *** software evolves,changes often introduce many unrelated responsibilities to the same classes or distribute tightly-related methods in different *** changes make the classes difficult to understand and *** class refactoring is an effective technique to improve the quality of software structure by decomposing unrelated methods in one class to create new classes or extracting tightly-related methods from different *** this paper,we propose a novel approach for class extraction from internetware source *** approach leverages a community structure detection technique to partition software into clusters and extracts classes from the resulting *** experimental results,which investigate the public well-known internetware PKUAS,indicate that:(1)the proposed approach is much faster than existing search-based clustering approaches(Hillclimbing and Genetic algorithm)and is thus applicable for large-scale internetware;(2)the proposed approach can identify meaningful class extractions for internetware;and(3)Extract Class refactoring candidates identified by the proposed approach significantly improve class cohesion of internetware.

关键词： refactoring extract class community structure software modularity internetware

Finding shrink critical section refactoring opportunities for the evolution of concurrent code in trustworthy software

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Science China(Information Sciences) 2013年第1期56卷 78-97页

作者： QIAN Ju CHEN Lin XU BaoWen College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics State Key Laboratory for Novel Software Technology Nanjing University

With the keyword synchronized,Java provides a simple but often over-used synchronization *** programmers tend to use a big synchronized section to protect a large block of statements even if many of them are unnecessarily *** coarse-gained synchronizations may increase lock contention and thereby decrease the performance of a program,especially in a multi-core *** decrease in performance may affect the quality of service provided by the software and hence make the software less *** ensure trustworthiness,this paper proposes a source-code level refactoring approach to optimize coarse-gained *** exploits dependence and escape information to search for shrinkable critical sections and can transform them into smaller ones *** approach can be used to gradually evolve concurrent code for better *** the approach,to achieve more optimizations,we develop a new escape analysis,named escape state analysis,which can not only tell us whether an object finally escapes but also determine the escape states of objects at each program *** such an analysis,more refactoring opportunities can be *** build a tool and test our refactoring approach on several benchmark *** results show that the proposed approach does make effective refactoring suggestions for the users.

关键词： concurrent synchronization refactoring dependence escape analysis

Application of refactoring and Design Pattern in Land Information System Development

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Geo-Spatial Information Science 2007年第4期10卷 299-302页

作者： CHEN Luyao YUE Jianwei JIANG Weiguo LI Jing CHEN Yunhao College of Resources Science and Technology Beijing Normal University 19 Xinjiekouwai Street Beijing 100875 China State Key Laboratory of Earth Surface Processes and Resource Ecology 19 Xinjiekouwai Street Beijing 100875 China

The unceasing change problem of land information systems can be resolved through the refactoring and design pattern. To promote the implementation of design pattern and refactoring methods in developing land information systems reusing software design, applying refactoring methods to the abstract factory and decorator design patterns in land information system development is discussed.

关键词： design pattern refactoring land information system

Developing a Clang Libtooling-Based refactoring Tool for CUDA GPU Programming

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Journal of Software Engineering and Applications 2024年第2期17卷 89-108页

作者： Kian Nejadfard Janche Sang Champ Titles Inc. Cleveland USA Department of Computer Science Cleveland State University Cleveland USA

refactoring tools, whether fully automated or semi-automated, are essential components of the software development life cycle. As software libraries and frameworks evolve over time, it’s crucial for programs utilizing them to also evolve to remain compatible with modern advancements. Take, for example, NVIDIA CUDA’s platform for general-purpose GPU programming. Embracing the more contemporary unified memory architecture offers several benefits, such as simplifying program source code, reducing bugs stemming from manual memory management between host and device memory, and optimizing memory transfer through automated memory handling. This paper describes our development of a refactoring tool based on Clang’s Libtooling to facilitate this transition automatically, thereby relieving developers from the burden and risks associated with manually refactoring large code bases.

关键词： refactoring CUDA Unified Memory Clang Libtooling

Source-to-Source refactoring and Elimination of Global Variables in C Programs

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Journal of Software Engineering and Applications 2013年第5期6卷 264-273页

作者： Hemaiyer Sankaranarayanan Prasad A. Kulkarni Electrical Engineering and Computer Science University of Kansas Lawrence USA

A global variable in C/C++ is one that is declared outside a function, and whose scope extends the lifetime of the entire program. Global variables cause problems for program dependability, maintainability, extensibility, verification, and thread-safety. However, global variables can also make coding more convenient and improve program performance. We have found the use of global variables to remain unabated and extensive in real-world software. In this paper we present a source-to-source refactoring tool to automatically detect and localize global variables in a program. We implement a compiler based transformation to find the best location to redefine each global variable as a local. For each global, our algorithm initializes the corresponding new local variable, passes it as an argument to necessary functions, and updates the source lines that used the global to now instead use the corresponding local or argument. We also characterize the use of global variables in standard benchmark programs. We study the effect of our transformation on static program properties, such as change in the number of function arguments and program state visibility. Additionally, we quantify dynamic program features, including memory and runtime performance, before and after our localizing transformation.

关键词： Global Variable Program refactoring Compiler Transformations

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用refactoring来改善设计

计算机仿真 2002年第4期19卷 124-125页

作者：周警伟罗晓沛中国科技大学研究生院北京100039

面向对象的技术提高了软件重用能力 ,人们经验的不断总结也不断地改善了设计方法。如何去改善我们原有的系统是一个比较复杂的课题 ,也是一个不可回避的问题。这篇论文论述了如何使用refactoring技术来改善原有设计。

关键词： refactoring 软件开发面向对象软件重用软件重构

Search-Based Cost-Effective Software Remodularization

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Journal of Computer Science & Technology 2018年第6期33卷 1320-1336页

作者： Rim Mahouachi Complex Outstanding Systems Modeling Optimization and Supervision Laboratory National School of Computer Science University of Manouba 2010 Manouba Tunisia

Software modularization is a technique used to divide a software system into independent modules （packages）that are expected to be cohesive and loosely coupled. However, as software systems evolve over time to meet new require-ments, their modularizations become complex and gradually loose their quality. Thus, it is challenging to automaticallyoptimize the classes＇ distribution in packages, also known as remodularization. To alleviate this issue, we introduce a newapproach to optimize software modularization by moving classes to more suitable packages. In addition to improving designquality and preserving semantic coherence, our approach takes into consideration the refactoring effort as an objective initself while optimizing software modularization. We adapt the Elitist Non-dominated Sorting Genetic Algorithm （NSGA-Ⅱ）of Deb et al. to find the best sequence of refactorings that 1） maximize structural quality, 2） maximize semantic cohesivenessof packages （evaluated by a semantic measure based on WordNet）, and 3） minimize the refactoring effort. We report theresults of an evaluation of our approach using open-source projects, and we show that our proposal is able to produce acoherent and useful sequence of recommended refactorings both in terms of quality metrics and from the developer＇s pointsof view.

关键词： remodularization search-based software engineering refactoring effort multi-objective optimization seman-tics dependency