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25th IEEE/ACM International Conference on Program Comprehension (ICPC)

作者： Aghajani, Emad Mocci, Andrea Bavota, Gabriele Lanza, Michele Univ Svizzera Italiana REVEAL Fac Informat Lugano Switzerland

ISBN: (纸本)9781538605356

Exploring and analyzing the history of changes is an intrinsic part of software evolution comprehension. Existing tools that exploit the data residing in version control repositories provide only limited support for the intuitive navigation of code changes from a historical perspective. We present the Code Time Machine, a lightweight IDE plugin which uses visualization techniques to depict the history of any chosen file augmented with information mined from the underlying versioning system. Inspired by Apple's Time Machine, our tool allows both developers and the system itself to seamlessly move through time. A video of the Code Time Machine can be found at: https://***/meblwFO95oA

关键词： Software Evolution version control system Visualization

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Understanding systematic and collaborative code changes by mining evolutionary trajectory patterns

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JOURNAL OF SOFTWARE-EVOLUTION AND PROCESS 2017年第3期29卷

作者： Jiang, Qingtao Peng, Xin Wang, Hai Xing, Zhenchang Zhao, Wenyun Fudan Univ Sch Comp Sci Shanghai Peoples R China Fudan Univ Shanghai Key Lab Data Sci Shanghai Peoples R China Nanyang Technol Univ Sch Comp Engn Singapore Singapore

The life cycle of a large-scale software system can undergo many releases. Each release often involves hundreds or thousands of revisions committed by many developers over time. Many code changes are made in a systematic and collaborative way. However, such systematic and collaborative code changes are often undocumented and hidden in the evolution history of a software system. It is desirable to recover commonalities and associations among dispersed code changes in the evolutionary trajectory of a software system. In this paper, we present Summarizing Evolutionary Trajectory by Grouping and Aggregation (SETGA), an approach to summarizing historical commit records as trajectory patterns by grouping and aggregating relevant code changes committed over time. The SETGA extracts change operations from a series of commit records from version control systems. It then groups extracted change operations by their common properties from different dimensions such as change operation types, developers, and change locations. After that, SETGA aggregates relevant change operation groups by mining various associations among them. We implement SETGA and conduct an empirical study with 3 open-source systems. We investigate underlying evolution rules and problems that can be revealed by the identified patterns and analyze the evolution of trajectory patterns in different periods. The results show that SETGA can identify various types of trajectory patterns that are useful for software evolution management and quality assurance.

关键词： code change evolution mining pattern version control system

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Git4Voc: Collaborative Vocabulary Development Based on Git

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INTERNATIONAL JOURNAL OF SEMANTIC COMPUTING 2016年第2期10卷 167-191页

作者： Halilaj, Lavdim Grangel-Gonzalez, Irlan Coskun, Goekhan Lohmann, Steffen Auer, Soeren Univ Bonn Enterprise Informat Syst Romerstr 164 D-53117 Bonn Germany

Collaborative vocabulary development in the context of data integration is the process of finding consensus between experts with different backgrounds, system understanding and domain knowledge. The complexity of this process increases with the number of people involved, the variety of the systems to be integrated and the dynamics of their domain. In this paper, we advocate that the usage of a powerful version control system is one of the keys to address this problem. Driven by this idea and the success of the version control system Git in the context of software development, we investigate the applicability of Git for collaborative vocabulary development. Even though vocabulary development and software development have much more similarities than differences, there are still important challenges. These need to be considered in the development of a successful versioning and collaboration system for vocabulary development. Therefore, this paper starts by presenting the challenges we are faced with during the collaborative creation of vocabularies and discusses its distinction to software development. Drawing from these findings, we present Git4Voc which comprises guidelines on how Git can be adopted to vocabulary development. Finally, we demonstrate how Git hooks can be implemented to go beyond the plain functionality of Git by realizing vocabulary-specific features like syntactic validation and semantic diffs.

关键词： version control system collaborative vocabulary development Git hook

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VoCol: An Integrated Environment to Support version-controlled Vocabulary Development 20th

VoCol: An Integrated Environment to Support Version-Controll...

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20th International Conference on Knowledge Engineering and Knowledge Management (EKAW)

作者： Halilaj, Lavdim Petersen, Niklas Grangel-Gonzalez, Irlan Lange, Christoph Auer, Soeren Coskun, Goekhan Lohmann, Steffen Univ Bonn Enterprise Informat Syst EIS Bonn Germany Fraunhofer Inst Intelligent Anal & Informat Syst St Augustin Germany Bayer Business Serv Berlin Germany

ISBN: (纸本)9783319490045;9783319490038

Vocabularies are increasingly being developed on platforms for hosting version-controlled repositories, such as GitHub. However, these platforms lack important features that have proven useful in vocabulary development. We present VoCol, an integrated environment that supports the development of vocabularies using version control systems. VoCol is based on a fundamental model of vocabulary development, consisting of the three core activities modeling, population, and testing. We implemented VoCol using a loose coupling of validation, querying, analytics, visualization, and documentation generation components on top of a standard Git repository. All components, including the version-controlled repository, can be configured and replaced with little effort to cater for various use cases. We demonstrate the applicability of VoCol with a real-world example and report on a user study that confirms its usability and usefulness.

关键词： Vocabulary development version control system Ontology engineering Integrated development environment IDE Git GitHub Webhook

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Git4Voc: Git-based versioning for Collaborative Vocabulary Development 10

Git4Voc: Git-based Versioning for Collaborative Vocabulary D...

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10th IEEE International Conference on Semantic Computing (ICSC)

作者： Halilaj, Lavdim Grangel-Gonzalez, Irlan Coskun, Goekhan Auer, Soeren Univ Bonn EIS Dept Bonn Germany

ISBN: (纸本)9781509006625

Collaborative vocabulary development in the context of data integration is the process of finding consensus between the experts of the different systems and domains. The complexity of this process is increased with the number of involved people, the variety of the systems to be integrated and the dynamics of their domain. In this paper we advocate that the realization of a powerful version control system is the heart of the problem. Driven by this idea and the success of Git in the context of software development, we investigate the applicability of Git for collaborative vocabulary development. Even though vocabulary development and software development have much more similarities than differences there are still important differences. These need to be considered within the development of a successful versioning and collaboration system for vocabulary development. Therefore, this paper starts by presenting the challenges we were faced with during the creation of vocabularies collaboratively and discusses its distinction to software development. Based on these insights we propose Git4Voc which comprises guidelines how Git can be adopted to vocabulary development. Finally, we demonstrate how Git hooks can be implemented to go beyond the plain functionality of Git by realizing vocabulary-specific features like syntactic validation and semantic diffs.

关键词： version control system collaborative vocabulary development git

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Proactive Prevention of False-positive Conflicts in Distributed Ontology Development 8

Proactive Prevention of False-positive Conflicts in Distribu...

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8th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management (KDIR)

作者： Halilaj, Lavdim Grangel-Gonzalez, Irlan Vidal, Maria-Esther Lohmann, Steffen Auer, Soren Fraunhofer IAIS Enterprise Informat Syst Bonn Germany Univ Bonn Bonn Germany

ISBN: (纸本)9789897582035

A version control system (VCS) is usually required for successful ontology development in distributed settings. VCSs enable the tracking and propagation of ontology changes, as well as collecting metadata to describe changes, e.g., who made a change at which point in time. Modern VCSs implement an optimistic approach that allows for simultaneous changes of the same artifact and provides mechanisms for automatic as well as manual conflict resolution. However, different ontology development tools serialize the ontology artifacts in different ways. As a consequence, existing VCSs may identify a huge number of false-positive conflicts during the merging process, i.e., conflicts that do not result from ontology changes but the fact that two ontology versions are differently serialized. Following the principle of prevention is better than cure, we designed SerVCS, an approach that enhances VCSs to cope with different serializations of the same ontology. SerVCS is based on a unique serialization of ontologies to reduce the number of false-positive conflicts produced whenever different serializations of the same ontology are compared. We implemented SerVCS on top of Git, utilizing tools such as Rapper and Rdf-toolkit for syntax validation and unique serialization, respectively. We have conducted an empirical evaluation to determine the conflict detection accuracy of SerVCS whenever simultaneous changes to an ontology are performed using different ontology editors. The evaluation results suggest that SerVCS empowers VCSs by preventing them from wrongly identifying serialization related conflicts.

关键词： Ontology Development Unique Serialization version control system Editor Agnostic RDF OWL Turtle

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DSaaS A Cloud Service for Persistent Data Structures 6

DSaaS <i>A Cloud Service for Persistent Data Structures</i>

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6th International Conference on Cloud Computing and Services Science (CLOSER)

作者： le Roux, Pierre Bernard Kroon, Steve Bester, Willem Univ Stellenbosch Comp Sci Stellenbosch South Africa CSIR SU Ctr Artificial Intelligence Res Stellenbosch South Africa

ISBN: (纸本)9789897581823

In an attempt to tackle shortcomings of current approaches to collaborating on the development of structured data sets, we present a prototype platform that allows users to share and collaborate on the development of data structures via a web application, or by using language bindings or an API. Using techniques from the theory of persistent linked data structures, the resulting platform delivers automatically version-controlled map and graph abstract data types as a web service. The core of the system is provided by a Hash Array Mapped Trie (HAMT) which is made confluently persistent by path-copying. The system aims to make efficient use of storage, and to have consistent access and update times regardless of the version being accessed or modified.

关键词： DaaS SaaS Cloud Computing Persistent Data Structure version control system Hash-Array Mapped Trie

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Git4Voc: Git-based versioning for Collaborative Vocabulary Development

Git4Voc: Git-based Versioning for Collaborative Vocabulary D...

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IEEE International Conference on Semantic Computing

作者： Lavdim Halilaj Irlan Grangel-Gonzalez Gokhan Coskun Soren Auer EIS Department University of Bonn

ISBN: (纸本)9781509006632

关键词： version control system Collaborative vocabulary development Git

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In-Situ Visualisation of Fractional Code Ownership over Time 15

In-Situ Visualisation of Fractional Code Ownership over Time

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8th International Symposium on Visual Information Communication and Interaction (VINCI)

作者： Mueller, Christoph Reina, Guido Ertl, Thomas Univ Stuttgart Visualisierungsinst Allmandring 19 Stuttgart Germany

ISBN: (纸本)9781450334822

The term code ownership is used in software engineering to describe who authored a certain piece of software. Code ownership is commonly determined by investigating the data from version control systems, defining the owner as the person who contributed the most lines to a file, module, etc. Existing visualisation for ownership usually relies on per-line annotations from the version control system, thus only conveying the information who changed a line the last time, potentially adding some visual cue about how old the respective change is. This, however, can be misleading, because any change of even a single character changes ownership. In this paper, we propose a visualisation that accounts for fractional ownership changes over time on a per-character basis. Our technique incorporates visual cues to convey that typical definitions of ownership have an inherent uncertainty and provides details on the cause of this uncertainty on demand. For our definition of code ownership being a low-level one, we propose implementing the visualisation as an in-situ visualisation in the code editor of modern development environments. We will show examples of the efficacy of our approach and discuss its advantages and disadvantages compared to conventional line-based ownership.

关键词： Software Visualisation version control system Code Ownership Software Engineering

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Building a Community system to Teach Collaborative Software Development 10

Building a Community System to Teach Collaborative Software ...

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10th International Conference on Computer Science and Education (ICCSE)

作者： Villarrubia, Andrew Kim, Hyunju Jackson State Univ Dept Comp Sci Jackson MS 39217 USA

ISBN: (纸本)9781479966004

This paper reports an Open Source Software (OSS) community for Computer Science students to support collaborative software development activities. We built an inhouse version control system using only OSS products, which allows students to easily collaborate on development projects, while simultaneously allowing instructors to easily track students' activities. As our system provides a controlled educational environment, students can experience various aspects of software development by playing different roles. In addition, the community's code repository works as a knowledge base for student projects, and thus students can reuse the code and artifacts as examples or basic frameworks for their development.

关键词： Open source software Git GitLab collaborative software development version control system

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