Pre-emptive Adaptation Through Classical Control Theory

Self-adaptive systems are capable of changing their behaviour at runtime to meet target constraints. An important research question is how quality of service models can inform runtime adaptation.

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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 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 Moshe Y. Vardi Rice University, Houston, TX, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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Sven Overhage Clemens A. Szyperski Ralf Reussner Judith A. Stafford (Eds.)

Software Architectures, Components, and Applications Third International Conference on Quality of SoftwareArchitectures, QoSA 2007 Medford, MA, USA, July 11-13, 2007 Revised Selected Papers

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Volume Editors Sven Overhage Augsburg University Business Informatics and Systems Engineering Universitätsstraße 16, 86159 Augsburg, Germany E-mail: [email protected] Clemens A. Szyperski Microsoft Research One Microsoft Way, Redmond, WA 98052, USA E-mail: [email protected] Ralf Reussner University of Karlsruhe (TH) Am Fasanengarten 5, 76131 Karlsruhe, Germany E-mail: [email protected] Judith A. Stafford Tufts University Computer Science, 161 College Avenue, Medford, MA 02155, USA E-mail: [email protected]

Library of Congress Control Number: Applied for CR Subject Classification (1998): D.2.4, F.3, D.4, C.4, K.4.4, C.2 LNCS Sublibrary: SL 2 – Programming and Software Engineering ISSN ISBN-10 ISBN-13

0302-9743 3-540-77617-6 Springer Berlin Heidelberg New York 978-3-540-77617-8 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 2007 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 12213993 06/3180 543210

Preface

At the beginning of the 21st century, both software engineering and business application development are facing a variety of challenges. On the one hand, there is significant pressure to streamline the development pr