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european conference on object-oriented programming, ecoop 2000

作者： Borne, Isabelle Galal, Galal Hassan Evans, Huw Andrade, Luis Filipe Ecole des Mines de Nantes France Middlesex University United Kingdom University of Glasgow United Kingdom Oblog Software S.A Portugal

ISBN: (纸本)3540415130

Architecture represents the most fundamental set of design decisions about a system, and evolution aspects have to be considered at this level. Also, assuming that a deliberate "architecting" step has been taken, architecture is the stage where the input from requirements is most evident and can be inspected from an evolvability point of view. Moreover, the ever-changing world makes evolvability a strong quality requirement for a software architecture. More generally, software evolution and its management have been attracting considerable interest in recent years in component-based systems, as well in object-oriented legacy systems that need to be transformed into full-fledged frameworks. The first workshop on object-oriented architecture focussed on how to capture and assess architectural quality of object-oriented software. The second workshop was organized around three main aspects to support evolution: concepts;methods;techniques;and evaluation. This third edition addresses more specific topics that resulted from the previous editions: descriptions of types of architectural evolution, levels of representation to detect architecture changes, and the role of domain and requirements analysis in software and systems architecting. © Springer-Verlag Berlin Heidelberg 2000.

关键词： object oriented programming

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A model for describing object-oriented systems from multiple perspectives 3rd

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3rd International conference on Fundamental Approaches to Software Engineering (FACE 2000) at the european conference on Theory and Practice of Software (ETAPS 2000)

作者： Nelson, T Cowan, D Alencar, P Univ Waterloo Comp Syst Grp Waterloo ON N2L 3G1 Canada

ISBN: (纸本)3540672613

We present work on a formal model for the composition of object-oriented modules, or hyperslices, which represent different perspectives on the system being built. With the model, we should be able to study existing approaches such as subject-oriented programming, as well as extend other object-oriented languages, such as the UML, to accommodate the use of hyperslices. We show here a sample of the specification language that accompanies the formal model, and a small example of its use.

关键词： Specification languages

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Exception handling in object oriented systems

Exception handling in object oriented systems

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european conference on object-oriented programming, ecoop 2000

作者： Romanovsky, Alexander Dony, Christophe Knudsen, Jørgen Lindskov Tripathi, Anand Department of Computing Science University of Newcastle upon Tyne Newcastle upon TyneNE1 7RU United Kingdom Université Montpellier-II and LIRMM Laboratory 161 rue Ada Montpellier Cedex 534392 France Department of Computer Science University of Aarhus Åbogade 34 Århus NDK-8200 Denmark Department of Computer Science University of Minnesota MinneapolisMN55455 United States

ISBN: (纸本)3540415130

Exception handling continues to be a challenging problem in object oriented system design. One reason for this is that today. software systems are getting increasingly more complex. Moreover, exception handling is needed in a wide range of application systems, sometimes requiring domain-specific models for handling exceptions. Also, concurrency, distribution, and code mobility add new dimensions to the existing challenges in this area. The integration of exception handling mechanisms in a design needs to be based on wellfounded principles and formal models to deal with the complexities of such systems and to ensure robust and reliable operation. It needs to be pursued at the very start of a design with a clear understanding of the ensuing implications at all stages, ranging from design specification, implementation, operation, maintenance, and evolution. This workshop was structured around the presentation and discussion of the various research issues in this regard to develop a common understanding of the current and future directions of research in this area. © Springer-Verlag Berlin Heidelberg 2000.

关键词： object oriented programming

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Creative object-oriented modelling: Support for intuition, flexibility, and collaboration in CASE tools 14th

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14th european conference on object-oriented programming, ecoop 2000

作者： Damm, Christian Heide Hansen, Klaus Marius Thomsen, Michael Tyrsted, Michael Department of Computer Science University of Aarhus Aabogade 34 Aarhus N8200 Denmark

ISBN: (纸本)3540676600

A major strength in object-oriented development is the direct support for domain modelling offered by the conceptual framework underlying object-orientation. In this framework, domains and systems can be analysed and understood using models at a high level of abstraction. To support the construction of such models, a large number of Computer-Aided Software Engineering tools are available. These tools excel in supporting design and implementation, but have little support for elements such as creativity, flexibility, and collaboration. We believe that this lack of support partly explains the low adoption of CASE tools. Based on this, we have developed a tool, Knight, which supports intuition, flexibility, and collaboration by implementing gesture based UML modelling on a large electronic whiteboard. Such support improves CASE tools, and can thus potentially lead to increased adoption of CASE tools and thus ultimately help improving the overall quality of development projects. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Computer aided software engineering

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Distributed asynchronous collections: Abstractions for publish/subscribe interaction 14th

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14th european conference on object-oriented programming, ecoop 2000

作者： Eugster, Patrick Th Guerraoui, Rachid Sventek, Joe Swiss Federal Institute of Technology Lausanne Switzerland Agilent Laboratories Scotland Edinburgh United Kingdom

ISBN: (纸本)3540676600

Publish/subscribe is considered one of the most important interaction styles for the explosive market of enterprise application integration. Producers publish information on a software bus and consumers subscribe to the information they want to receive from that bus. The decoupling nature of the interaction between the publishers and the subscribers is not only important for enterprise computing products but also for many emerging e-commerce and telecommunication applications. It is often claimed that object-orientation is inherently incompatible with the publish/subscribe interaction style. This flawed argument is due to the persistent confusion between object-orientation as a modeling discipline and the specific request/reply mechanism promoted by CORBA-like middleware systems. This paper describes object-oriented abstractions for publish/subscribe interaction in the form of Distributed Asynchronous Collections (DACs). DACs are general enough to capture the commonalities of various publish/subscribe interaction styles, and flexible enough to allow the exploitation of the differences between these flavors. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Common object request broker architecture (CORBA)

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Specification, implementation, and validation of object-oriented embedded systems

Specification, implementation, and validation of object-orie...

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european conference on object-oriented programming, ecoop 2000

作者： Terrier, François Voros, Nikos S. Brockmeyer, Udo LETI/DEIN/SLA/L-LSP CEA-Saclay Gif sur Yvette CedexF-91191 France Intracom S.A 254 Panepistimiou Str Patras264 43 Greece OFFIS e.V Escherweg 2 OldenburgD-26121 Germany

ISBN: (纸本)3540415130

This workshop objective is to identify the main lacks of UML for developing real-time embedded systems and the main prospective directions for research to these difficulties. For that, it aims to gather academics and industrial people to discuss on industrial needs, on formalisms prospects and on advanced solutions. It tries to tackle the three main part of a development cycle: specification/analysis, design/implementation and validation. Three main sessions have emerged from the workshop submissions. The first one was focused on setting the end users requirements for UML modeling of real-time embedded systems. The second has been focused on design and implementation techniques proposals and experiences. The third has been centered on formal techniques for the validation of the applications from their UML model. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Embedded systems

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Coupling-guided Cluster Analysis approach to reengineer the modularity of object-oriented systems

Proceedings of the European Conference on Software Maintenan...

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Proceedings of the european conference on Software Maintenance and Reengineering, CSMR 2000年 13-22页

作者： Brito e Abreu, Fernando Pereira, Goncalo Sousa, Pedro INESC Lisboa Portugal

This paper describes a validation experiment of a quantitative approach to the modularization of object oriented systems. The approach used is based on Cluster Analysis, a statistical technique used in many fields of science to group items. Here, the clusters are modules and the items are classes. A sample of some relatively large object oriented systems was used in this experiment. The calculation of the dissimilarity between classes is based on their relative couplings combined through six different rating schemes. These couplings are classified according to a taxonomy framework where categories were assigned weights. The coupling data were obtained with the MOODKit G2 tool. The results obtained allow to conclude on the applicability of the proposed approach. This work was developed in the realm of the MOOD Project that aims to deliver a quantitative framework to support the design of object oriented systems.

关键词： Computer aided software engineering Computer software selection and evaluation object oriented programming Statistical methods Cluster analysis

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object query optimization through detecting independent subqueries

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INFORMATION SYSTEMS 2000年第8期25卷 467-490页

作者： Plodzien, J Kraken, A Polish Acad Sci Inst Comp Sci PL-00901 Warsaw Poland Polish Japanese Inst Informat Technol Warsaw Poland

The problem of query optimization in object-oriented databases is addressed. We follow the Stack-Based Approach to query languages, which employs the naming-scoping-binding paradigm of programming languages rather than traditional database concepts such as relational/object algebras or calculi. The classical environment stack is a semantic basis for definitions of object query operators, such as selection, projection/navigation, dependent join, and quantifiers. We describe a general object data model and define a formalized OQL-like query language SBQL. Optimization by rewriting concerns queries containing so-called independent subqueries. It consists in detecting them and then factoring outside loops implied by query operators. The idea is based on the formal static analysis of scoping rules and binding names occurring in a query. It is more general than the classical pushing selections/projections before joins. (C) 2001 Elsevier Science Ltd. All rights reserved.

关键词： object-oriented databases query languages stack-based approach query optimization rewriting rules independent subqueries

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Design properties and object-oriented software changeability

Proceedings of the European Conference on Software Maintenan...

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Proceedings of the european conference on Software Maintenance and Reengineering, CSMR 2000年 45-54页

作者： Chaumun, M.Ajmal Kabaili, Hind Keller, Rudolf K. Lustman, Francois Saint-Denis, Guy Universite de Montreal Montreal Canada

The assessment of the changeability of software systems is of major concern for buyers of the large systems found in fast-moving domains such as telecommunications. One way of approaching this problem is to investigate the dependency between the changeability of the software and its design, with the goal of finding design properties that can be used as changeability indicators. In our research, we defined a model of software changes and change impacts and implemented it for the C++ language. Furthermore, we identified a set of nine object-oriented (OO) design metrics, four of which are specifically geared towards changeability detection. The model and the metrics were applied to three test systems of industrial size. The experiment showed a high correlation, across systems and across changes, between changeability and the access to a class by other classes through method invocation or variable access. On the other hand, no result could support the hypothesis that the depth of the inheritance tree has some influence on changeability. Furthermore, our results confirm the observation of others that the use of inheritance is rather limited in industrial systems.

关键词： Software engineering C (programming language) Computer software maintenance Computer software selection and evaluation object oriented programming object oriented software changeability Software metrics Software quality

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Towards a quantitative assessment of method replacement

Proceedings of the European Conference on Software Maintenan...

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Proceedings of the european conference on Software Maintenance and Reengineering, CSMR 2000年 141-150页

作者： Keller, Rudolf K. Schauer, Reinhard Universite de Montreal Montreal Canada

object-oriented programming is about the creation of reusable classes that are to be extended to capture the specific requirements of the application at hand. However, instead of extending the methods of these classes, programmers often introduce subclasses in which they replace methods with new implementations that are completely detached from the superclass; that is, the subclass method does not invoke, directly or indirectly, its counterpart in the superclass. In this paper, we apply the SPOOL environment to the reverse-engineered C++ source code of the ET++ application framework to investigate the occurrences and causes for method replacements. To this end, we define a method replacement indicator (MRI) that quantifies the extent of method replacements. Based on the data obtained in our case study, we identify and discuss the ten causes why programmers replace non-primitive method implementations of reusable classes.

关键词： object oriented programming C (programming language) Computer software maintenance Computer software reusability Reverse engineering Software engineering Method replacement indicator (MRI) Software comprehension Software package SPOOL

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