Quality of Software Architectures. Models and Architectures 4th Inte

This book constitutes the thoroughly refereed post-proceedings of the Fourth International Conference on the Quality of Software Architectures, QoSA 2008, held in Medford, MA, USA, in July 2007, in conjunction with the 10th International ACM SIGSOFT Sympo

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Alfred Kobsa University of California, Irvine, CA, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen University of Dortmund, Germany Madhu Sudan Massachusetts Institute of Technology, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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Steffen Becker Frantisek Plasil Ralf Reussner (Eds.)

Quality of SoftwareArchitectures Models and Architectures 4th International Conference on the Quality of Software Architectures, QoSA 2008 Karlsruhe, Germany, October 14-17, 2008 Proceedings

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Volume Editors Steffen Becker FZI Forschungszentrum Informatik Haid-und-Neu-Strasse 10-14, 76131 Karlsruhe, Germany E-mail: [email protected] Frantisek Plasil Charles University, Department of Software Engineering Malostranske nam. 25, 11800 Prague 1, Czech Republic E-mail: [email protected] Ralf Reussner Universität Karlsruhe (TH), Karlsruhe Institute of Technology (KIT) Institut für Programmstrukturen und Datenorganisation 76128 Karlsruhe, Germany E-mail: [email protected]

Library of Congress Control Number: 2008935391 CR Subject Classification (1998): D.2.9, D.2.11, B.8, D.4.8, C.4 LNCS Sublibrary: SL 2 – Programming and Software Engineering ISSN ISBN-10 ISBN-13

0302-9743 3-540-87878-5 Springer Berlin Heidelberg New York 978-3-540-87878-0 Springer Berlin Heidelberg New York

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer. Violations are liable to prosecution under the German Copyright Law. Springer is a part of Springer Science+Business Media springer.com © Springer-Verlag Berlin Heidelberg 2008 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 12529599 06/3180 543210

Preface

Models are used in all kinds of engineering disciplines to abstract from the various details of the modelled entity in order to focus on a specific aspect. Like a blueprint in civil engineering, a software architecture provides an abstraction from the full software system’s complexity. It al