Category Archives: 4.3 Finished Theses

Final Thesis: A Quality Model for Inner Source

Abstract: Inner Source (IS) ist die Verwendung von Open Source (OS) Entwicklungspraktiken innerhalb einer Organisation. Einige Organisationen führen IS Projekte oder sogar IS Programme durch. Bisher gibt es zwar veröffentlichte OS Qualitätsmodelle, allerdings ist kein Qualitätsmodell speziell für IS bekannt. Dieses Papier präsentiert ein Qualitätsmodell für IS Programme und Projekte. Wir führen fünf Interviews mit IS Experten durch und analysieren diese mittels thematischer Analyse. Anhand der daraus entstandenen Einblicke entwickeln wir ein hierarchisches Qualitätsmodell für IS Programme und IS Projekte, die wir anschließend zu recherchierten OS Qualitätsmodellen abgrenzen.

Keywords: Inner source, inner source quality, inner source metrics

PDFs: Master ThesisThesis Description

Reference: Bernd Grillenberger. A Quality Model for Inner Source. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: The Benefits of Continuous Deployment Evaluated Using the JDownloader Software

Abstract: Continuous Delivery and Continuous Deployment approaches have seen widespread adoption in the software industry. To harness such techniques effectively, close monitoring and detailed knowledge about the state of software in production is highly desirable. This thesis analyzes the JDownloader Immune System, a real-time monitoring and error detection mechanism developed for the open source download manager software JDownloader. It describes the mathematical model for error detection based on time series analysis and Holt-Winters-Forecasting. The thesis continues to provide insight on the architecture of the immune system and shows how it provides useful information to developers and users through state dashboards. Finally, it evaluates the effectiveness of the immune system compared to manual user reports. The thesis finds that error detection speed for severe issues is 16 times faster than through manual reports and critical bugs are more than four times more likely to be detected within the first 24 hours after their first appearance.

Keywords: Continuous software engineering, continuous deployment, continuous delivery, JDownloader

PDFs: Master Thesis, Thesis Description

Reference: Michael Weber. The Benefits of continuous deployment evaluated using the JDownloader software. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Managing Organization Data for Patch-Flow Measurement

Abstract: Open source practices and the establishment of an open source like culture within organizations is also called Inner Source (IS). The existing software Collaboration Metric Suite (CMSuite) provides metrics about collaboration between software projects. These metrics can validate the application of IS in organizations. However, the underlying model of the CMSuite currently only supports simple hierarchical organizational structures. Organizations with a more complex structure can not be correctly mapped. In this thesis, a model was designed and integrated into the CMSuite, that fulfills the requirements of a complex organizational structure. For this purpose, two case studies, which show the weaknesses of the current model, were studied. Finally, it was shown that dealing with complex organization structures is not a problem for the CMSuite anymore.

Keywords: Software engineering, mining software repositories, inner source

PDFs: Master Thesis, Thesis Description

Reference: Andreas Bauer. Managing Organization Data for Patch-Flow Measurement. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: A Theory of Industry Best Practices of FLOSS Governance and Compliance

Abstract: Using open source code in commercial software development is gaining more and more momentum during the recent years. While providing benefits along all three dimensions of the software development’s magic triangle of cost, time and scope, use of open source in commercial setting holds certain risks and challenges that can be addressed with FLOSS governance and compliance in the organization. However, the surveys show that about a half of the companies dealing with open source in their software development do not have any specific FLOSS governance procedures. The objective of this thesis is to develop a theory of FLOSS governance and compliance best practices in software development companies. The study uses case study research methodology applied to five German companies. The best practices are derived from the data collected during semi-structured interviews with the help of Qualitative Data Analysis. Key research findings are summarized and the full list of derived best practices in the form of best practice patterns is presented. The formulated best practices in the categories “Policies”, “Processes” and “People and Tools” can be used by software companies to leverage the advantages of using open source while mitigating the associated risks.

Keywords: Open source software, FLOSS, FOSS, proprietary software, FLOSS government, open source license compliance, software development management, case study, best practice

PDFs: Master Thesis, Work Description

Reference: Viktoriya Promyshlyanska. Theory of Industry Best Practices of FLOSS Governance and Compliance. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Integration of a Refactoring UI into the Sweble Hub Software

Abstract: Wikis are an essential part of modern internet in order to store knowledge. However, to date, they lack functions which assist on restructuring and transforming the contents of a wiki. The task of maintaining the contents and structure is therefore time-consuming and error-prone. This thesis designs and implements a user interface for restructurings in wikis build on the Sweble Hub software, which is a software similar to most wikis. In contrast to classic wikis, it is able to provide assistance on restructurings. With Sweble Hub and the user interface designed in this thesis, the wiki authors’ efficiency is greatly improved.

Keywords: Wiki, AST, Refactoring, Transformation, UI

PDFs: Master Thesis, Work Description

Reference: Gabriel Bauer. Integration of a Refactoring UI into the Sweble Hub Software. Bachelor Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Tree-based, Semantic Article Difference Visualization

Abstract: Die Plattform Sweble Hub ermöglicht es, Wiki-Inhalte auf Basis des Wiki Object Model s kollaborativ zu bearbeiten. Dies findet dadurch nicht, wie normalerweise üblich, auf Wikitext-Ebene statt, sondern nach dem Prinzip ’what you see is what you get’. Ziel ist es, das existierende Projekt um eine übersichtliche Artikel Diff Visualisierung zu erweitern, die es ermöglicht, einen verständlichen Überblick über getätigte Änderungen zu erhalten. Im Rahmen dieser Bachelorarbeit wird eine Lösung vorgestellt, wie man Wikitext-Datei-Versionen anschaulich vergleichen kann. Die Grundlage hierfür sind Baumbasierte Algorithmen und Datenstrukturen, die Wikitext-Dokumente und erfolgte Modifikationen semantisch interpretieren können. Dies erzeugt im Vergleich zu Text-basierten Diffs eine detailliertere Darstellung. Die erarbeitete Ausarbeitung soll in das Sweble Hub eingebettet werden.

Keywords: Wiki, AST, Diff, Tree-based Diff, HD-Diff, Visualization, Web, HTML

PDFs: Master Thesis, Work Description

Reference: Oliver Lutz. Tree-based, Semantic Article Difference Visualization. Bachelor Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Text Mining for Relationship Extraction

Abstract: Qualitative Data Analysis (QDA) methods are based on manual coding of texts. To extract a domain model from a text corpus using QDA, information has to be extracted and compiled into the domain model by hand. This is especially a problem for cases where large amounts of data have to be analyzed. For this purpose, We present a relationship extraction approach based on Natural Language Processing. It automates the extraction of relationships between codes that were provided by the coder. This speeds up the analysis process and helps to uncover relationships the human coder might have missed. Our method produces a graphical overview of relationships that were found to exist between codes. It is evaluated by comparison with previously generated models from existing Qualitative Data Analysis projects.

Keywords: Information Retrieval, Text Mining, Natural Language Processing, Qualitative Data Analysis, QDA

PDFs: Master Thesis, Work Description

Reference: Martin Hofmann. Text Mining for Relationship Extraction. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Extending an Inner Source Patch-Flow Crawler for Gitlab and Github Enterprise

Abstract: Due to the advantages, source code management is widely used nearly everywhere in software development. But often the access to organizational repositories is restricted to individual projects or groups. In contrast to that, Riehle, Capraro, Kips und Horn (2016) describe the application of techniques established in open source development, like organization internal accumulation and publication of knowledge, as an important element of inner source. In this context features set of SCM, like following up the author of a repositories commit, is a crucial part for measuring patches between organizational units. The Professorship for Open Source Software developed a crawler, with the purpose of gathering and saving patch-flow data, by automatic processing of a repository’s metadata. Extending the Patch-Flow crawler with an interface for GitLab and GitHub Enterprise allows to use the implemented functionality as standalone or in combination with already existing features. This way, the possible applications and accuracy are enhanced.

Keywords: Software engineering, mining software repositories, inner source, patch-flow

PDFs: Bachelor ThesisThesis Description

Reference: Benjamin Mach. Extending a Inner Source Patch-Flow Crawler for Gitlab and Github Enterprise. Bachelor Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Measuring the Patch Review Process in Open and Inner Source

Abstract: Inner source development is the application of open source practices for a company’s internal software development. One of the practices is called review process. This process separates the code contribution from its integration. In inner source, the review process is not researched. Therefore, a suitable software for measuring this process is required for research purposes. The measuring instruments for inner source development used today are not capable of examining the review process. This thesis develops an extension of an existing application for analyzing review processes in inner source. To evaluate the functionality of this application, it is applied to selected projects. The collected data is used to demonstrate that they are suitable for answering typical questions for review processes. For further research the extension allows measurement of the review processes in inner source projects.

Keywords: Software engineering, mining software repositories, inner source, patch-flow

PDFs: Master Thesis, Work Description

Reference: Johannes Pfann. Measuring the Patch Review Process in Open and Inner Source. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Integration und Erweiterung eines Visuellen Editors in Sweble Hub

Abstract: Sweble Hub ist eine Kollaborationsplattform, die eine anwendungsneutrale Verwaltung und Bearbeitung von Wiki-Inhalten auf Basis des Wiki Object Models (WOM) ermöglichen soll. Die Bearbeitung von Inhalten mithilfe eines visuellen Editors soll dabei plattformunabhängig innerhalb eines Webbrowsers erfolgen können. Hierfür wurden bereits im Vorfeld verschiedene Basistechnologien evaluiert und dabei der Visual-Editor der Wikimedia Foundation ausgewählt, sowie prototypisch umgesetzt. Im Rahmen dieser Arbeit wird der visuelle Editor um die Unterstützung des gesamten Wiki Object Models erweitert. Außerdem wird das Fundament für eine spätere Erweiterung hin zu einem kollaborativen Editor gelegt. Hierzu wird der aktuelle Stand der Forschung und Technik im Rahmen einer Literaturrecherche zu den verschiedenen Möglichkeiten der Bearbeitung von Inhalten innerhalb von Groupware Systemen untersucht und eine geeignete Methode ausgewählt.

Keywords: Wiki, Visual Editor, Wiki Object Model, Groupware

PDFs: Final thesis, Work description

Reference: Michael Haase. Integration und Erweiterung eines Visuellen Editors in Sweble Hub. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2016.