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Bezemer, C. (author), Zaidman, A. (author)Multi-tenancy is a relatively new software architecture principle in the realm of the Software as a Service (SaaS) business model. It allows to make full use of the economy of scale, as multiple customers "tenants" share the same application and database instance. All the while, the tenants enjoy a highly configurable application, making it...report 2010
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Matthijssen, N. (author), Zaidman, A. (author)Ajax-enabled web applications are a new breed of highly interactive, highly dynamic web applications. Although Ajax allows developers to create rich web applications, Ajax applications can be difficult to comprehend and thus to maintain. FireDetective aims to facilitate the understanding of Ajax applications. It uses dynamic analysis at both the...report 2011
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Bezemer, C.P. (author), Zaidman, A. (author)One of the key factors in customer satisfaction is the application performance. In traditional settings, it is usually not very difficult to manually detect a performance problem, however, with the advent of ultra-large-scale (ULS) systems [4], manual performance monitoring and prediction becomes tedious and would thus ideally require automation...report 2011
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Chen, C. (author), Zaidman, A. (author), Gross, H.G. (author)The highly dynamic and loosely coupled nature of a service-oriented software system leads to the challenge of understanding it. In order to obtain insight into the runtime topology of a SOA system, we propose a framework-based runtime monitoring approach to trace the service interactions during execution. The approach can be transparently...report 2011
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Espinha, T. (author), Zaidman, A. (author), Gross, H.G. (author)When trying to understand a system that is based on the principles of Service-Oriented Architecture (SOA), it is typically not enough to understand the individual services in the architecture, but also the interactions between the services. In this paper, we present a technique based on dynamic analysis that can be used to obtain insight into...report 2011
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Bezemer, C.P. (author), Cheplygina, V. (author), Zaidman, A. (author)One of the key factors in customer satisfaction is application performance. To be able to guarantee good performance, it is necessary to take appropriate measures before a server overload occurs. While in small systems it is usually possible to predict server overload using a subjective human expert, an automated overload prediction mechanism is...report 2011
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Bezemer, C. (author), Zaidman, A.E. (author)The performance of a software system directly influences customer satisfaction. Self-adaptiveness can contribute to this customer satisfaction by (1) taking appropriate measures when the performance becomes critical, e.g., the system load is too high, or (2) scheduling intensive tasks when the load is low. We investigate how self-adaptive...report 2012
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Hurdugaci, V. (author), Zaidman, A.E. (author)Preprint of paper published in: 16th European Conference on Software Maintenance and Reengineering (CSMR), 27-30 March 2012; doi:10.1109/CSMR.2012.12 Unit and integration tests can be invaluable during software maintenance as they help to understand pieces of code, they help with quality assurance and they build up confidence amongst developers....report 2012
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Espinha, T.A. (author), Chen, C. (author), Zaidman, A.E. (author), Gross, H.G. (author)Prepint of paper published in: ICSE Workshop on Principles of Engineering Service Oriented Systems (PESOS), 4 June 2012; doi:10.1109/PESOS.2012.6225940 Maintenance research in the context of Service Oriented Architecture (SOA) is currently lacking a suitable standard case study that can be used by scientists in order to (1) develop and assess...report 2012
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Espinha, T. (author), Chen, C. (author), Zaidman, A.E. (author), Gross, H.G. (author)Preprint of paper published in: 16th European Conference on Software Maintenance and Reengineering (CSMR), 27-30 March 2012; doi:10.1109/CSMR.2012.49 Maintenance research in the context of Service Oriented Architecture (SOA) is currently lacking a suitable standard case study that can be used by scientists in order to develop and assess their...report 2012
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Chen, C. (author), Gross, H.G. (author), Zaidman, A.E. (author)Preprint of paper published in: 5th IEEE International Conference on Service-Oriented Computing and Applications (SOCA), 17-19 December 2012; doi:10.1109/SOCA.2012.6449440 Due to the loosely coupled and highly dynamic nature of service-oriented systems, the actual configuration of such system only fully materializes at runtime, rendering many of...report 2012
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Vonken, F. (author), Brunekreef, J. (author), Zaidman, A.E. (author), Peeters, F. (author)In order to determine whether there is a gap between the current state-of-the-practice and state-of-the-art in software engineering, we performed a broad survey among Dutch software producing organizations. Our survey covers aspects of the software engineering cycle ranging from requirements engineering, over design and implementation to testing...report 2012
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Bezemer, C.P. (author), Zaidman, A.E. (author), Van der Hoeven, A. (author), Van de Graaf, A. (author), Wiertz, M. (author), Weijers, R. (author)Preprint of paper published in: ICSM 2012 - Proceedings of the IEEE International Conference on Software Maintenance, 23-28 September 2012; doi:10.1109/ICSM.2012.6405319 The goal of performance maintenance is to improve the performance of a software system after delivery. As the performance of a system is often characterized by unexpected...report 2012
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Peters, R. (author), Zaidman, A.E. (author)Preprint of paper published in: 16th European Conference on Software Maintenance and Reengineering (CSMR), 27-30 March 2012; doi:10.1109/CSMR.2012.79 An anti-pattern is a commonly occurring solution to a recurring problem that will typically negatively impact code quality. Code smells are considered to be symptoms of anti-patterns and occur at...report 2012
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Zaidman, A.E. (author), Matthijssen, N. (author), Storey, M.A. (author), Van Deursen, A. (author)Author's version of the work published in: Empirical Software Engineering (Springer), 18 (2), 2013; doi:10.1007/s10664-012-9200-5 Ajax-enabled web applications are a new breed of highly interactive, highly dynamic web applications. Although Ajax allows developers to create rich web applications, Ajax applications can be difficult to comprehend...report 2012
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Greiler, M.S. (author), Van Deursen, A. (author), Zaidman, A.E. (author)Preprint of paper published in: TOOLS 2012 - Proceedings of the 50th International Conference, Prague, Czech Republic, May 29-31, 2012; doi:10.1007/978-3-642-30561-0_8 In order to support test suite understanding, we investigate whether we can automatically derive relations between test cases. In particular, we search for trace-based...report 2012
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Bezemer, C.P. (author), Zaidman, A. (author)Preprint submitted to Elsevier. The goal of performance maintenance is to improve the performance of a software system after delivery. As the performance of a system is often characterized by unexpected combinations of metric values, manual analysis of performance is hard in complex systems. In this paper, we propose an approach that helps...report 2013
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Luijten, B. (author), Visser, J. (author), Zaidman, A. (author)We mined the issue database of GNOME to assess how issues are handled. How many issues are submitted and resolved? Does the backlog grow or decrease? How fast are issues resolved? Does issue resolution speed increase or decrease over time? In which subproject are issues handled most efficiently? To answer such questions, we apply several...report 2013
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Heck, P. (author), Zaidman, A. (author)Verification activities are necessary to ensure that the requirements are specified in a correct way. However, until now requirements verification research has focused on traditional up-front requirements. Agile or just-in-time requirements are by definition incomplete, not specific and might be ambiguous when initially specified, indicating a...report 2014
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Bezemer, C.P. (author), Milon, E. (author), Zaidman, A. (author), Pouwelse, J. (author)Regression testing can be done by re-executing a test suite on different software versions and comparing the outcome. For functional testing, the outcome of such tests is either pass (correct behaviour) or fail (incorrect behaviour). For non-functional testing, such as performance testing, this is more challenging as correct and incorrect are...report 2014