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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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Bouwers, E. (author), Van Deursen, A. (author), Visser, J. (author)In the evaluation of implemented software architectures, metrics can be used to provide an indication of the degree of encapsulation within a system and to serve as a basis for an informed discussion about how well-suited the system is for expected changes. Current literature shows that over 40 different architecture-level metrics are available...report 2011
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Dullemond, K. (author), Van Gameren, B. (author), Van Solingen, R. (author)Software engineering is by nature a highly collaborative activity. However, collaborating effectively in Global Software Engineering, in which team members are geographically, temporally and/or socio-culturally separated from each other, is more difficult. In a traditional co-located setting, one of the most important communication patterns is a...report 2011
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Mesbah, A. (author), Van Deursen, A. (author), Lenselink, S. (author)Using JavaScript and dynamic DOM manipulation on the client-side of web applications is becoming a widespread approach for achieving rich interactivity and responsiveness in modern web applications. At the same time, such techniques, collectively known as Ajax, shatter the metaphor of web ‘pages’ with unique URLs, on which traditional web...report 2011
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Hermans, F. (author), Pinzger, M. (author), Van Deursen, A. (author)Spreadsheets are used extensively in business processes around the world and just like software, spreadsheets are changed throughout their lifetime causing maintainability issues. This paper adapts known code smells to spreadsheet formulas. To that end we present a list of metrics by which we can detect smelly formulas and a visualization...report 2011
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Romano, D. (author), Pinzger, M. (author), Bouwers, E. (author)Service Oriented Architecture (SOA) enables organizations to react to requirement changes in an agile manner and to foster the reuse of existing services. However, the dynamic nature of service oriented systems and their agility bear the challenge of properly understanding such systems. In particular, understanding the dependencies among...report 2011
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Lindeman, R.T. (author), Kats, L.C.L. (author), Visser, E. (author)Tool support is vital to the effectiveness of domain-specific languages. With language workbenches, domain-specific languages and their tool support can be generated from a combined, high-level specification. This paper shows how such a specification can be extended to describe a debugger for a language. To realize this, we introduce a meta...report 2011
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Greiler, M. (author), Van Deursen, A. (author), Storey, M.A. (author)Testing plug-in-based systems is challenging due to complex interactions among many different plug-ins, and variations in version and configuration. The objective of this paper is to increase our understanding of what testers and developers think and do when it comes to testing plug-inbased systems. To that end, we conduct a qualitative ...report 2011
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Romano, D. (author), Di Penta, M. (author), Antoniol, G. (author)Uncaught exceptions, and in particular null pointer exceptions (NPEs), constitute a major cause of crashes for software systems. Although tools for the static identification of potential NPEs exist, there is need for proper approaches able to identify system execution scenarios causing NPEs. This paper proposes a search-based test data...report 2011
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Hemel, Z. (author), Visser, E. (author)A new generation of mobile touch devices, such as the iPhone, Android and iPad, are equipped with powerful, modern browsers. However, regular websites are not optimized for the specific features and constraints of these devices, such as limited screen estate, unreliable Internet access, touch-based interaction patterns, and features such as GPS....report 2011
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Kats, L.C.L. (author)This dissertation presents research on techniques, methods, and tool support for domain-specific language engineering. Domain-specific language engineering is the discipline of designing, developing, and maintaining domain-specific programming languages. The focus of this thesis is the architecture of language workbenches their underlying...doctoral thesis 2011
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Van der Tak, P. (author), Ramos, A. (author), Heule, M. (author)We present the solver RestartSAT which includes a novel technique to reduce the cost to perform a restart in CDCL SAT solvers. This technique, called ReusedTrail, exploits the observation that CDCL solvers often reassign the same variables to the same truth values after a restart. It computes a partial restart level for which it is guaranteed...journal article 2011
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Kats, L.C.L. (author), Vermaas, R. (author), Visser, E. (author)The reliability of compilers, interpreters, and development environments for programming languages is essential for effective software development and maintenance. They are often tested only as an afterthought. Languages with a smaller scope, such as domain-specific languages, often remain untested. General-purpose testing techniques and test...report 2011
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Hu, B.B. (author)An increasing number of mobile users demand adaptive services tailored to their specific requirements in a particular situation. Typically, when carrying out the task at hand, police officers need to have up-to-date information contextualized to their current situation in order to support their decision making. In contrast to the traditional...doctoral thesis 2011
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Nasr, K.A. (author), Gross, H.G. (author), Van Deursen, A. (author)Service Oriented Architecture, which builds on distributed computing platforms, is increasingly being adopted by organizations in both public and private sectors. Migration from traditional monolithic systems to services, in particular web services, characterizes much of systems evolution today. This paper analyzes some of the performance and...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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Romano, D. (author), Pinzger, M. (author)Recent empirical studies have investigated the use of source code metrics to predict the change- and defect-proneness of source code files and classes. While results showed strong correlations and good predictive power of these metrics, they do not distinguish between interface, abstract or concrete classes. In particular, interfaces declare...report 2011
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Bouwers, E. (author), Van Deursen, A. (author), Visser, J. (author)In this paper we introduce the concept of a -dependency profile-, a system level metric aimed at quantifying the level of encapsulation and independence within a system. We verify that these profiles are suitable to be used in an evaluation context by inspecting the dependency profiles for a repository of almost 100 systems. Furthermore we...report 2011
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Gonzalez Sanchez, A. (author)Software testing and diagnosis (debugging) is a time-consuming but rather important task for improving software reliability. It is therefore necessary to devise an appropriate verification strategy that not only achieves this reliability goal, but also does this at a minimum cost. Since exhaustive testing is hardly ever possible, testing...doctoral thesis 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