Architecture and Methods for Flexible Content Management in Peer-to-Peer Systems
The operation of dedicated content repositories is a change in perspective of content lifecycle management: their application largely promises both technical and financial benefits. Today, centrally managed static client-server architectures are the preva
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VIEWEG+TEUBNER RESEARCH
Udo Bartlang
Architecture and Methods for Flexible Content Management in Peer-to-Peer Systems With a foreword by Prof. Dr. Jörg P. Müller
VIEWEG+TEUBNER RESEARCH
Bibliographic information published by the Deutsche Nationalbibliothek The Deutsche Nationalbibliothek lists this publication in the Deutsche Nationalbibliografie; detailed bibliographic data are available in the Internet at http://dnb.d-nb.de.
Dissertation Clausthal, 2009 D 104
1st Edition 2010 All rights reserved © Vieweg+Teubner | GWV Fachverlage GmbH, Wiesbaden 2010 Editorial Office: Ute Wrasmann | Anita Wilke Vieweg+Teubner is part of the specialist publishing group Springer Science+Business Media. www.viewegteubner.de No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the copyright holder. Registered and/or industrial names, trade names, trade descriptions etc. cited in this publication are part of the law for trade-mark protection and may not be used free in any form or by any means even if this is not specifically marked. Cover design: KünkelLopka Medienentwicklung, Heidelberg Printing company: STRAUSS GMBH, Mörlenbach Printed on acid-free paper Printed in Germany ISBN 978-3-8348-1023-6
Foreword At times when the IT manager’s best friend is systems consolidation (which is a euphemism for centralisation), it may come somewhat as a surprise for you that this book investigates decentralisation in the context of content management systems. It may seem quite obvious that content will and should be managed by the party who creates and owns the content, and hence should be held in a—somewhat—centralised and managed location. However, over the past few years, we have been witnesses of some important trends and developments which call for novel ways of thinking about content management and maybe even broader, about computer systems in general. First, ongoing business globalization creates natural distribution of information at a corporate level, as well as decentralization of control over business resources and business processes. Changing alliances with partners require flexible architectures for content management that can adapt to changing constellations, roles, and access rights. Second, the need for outsourcing and resource efficiency has brought about concepts of virtualization, recently culminating in the cloud computing buzzword. Virtualization of content management services requires extremely scalable and flexible underlying information and communication architectures. These kinds of solutions are theoretically and practically impossible to implement based on centralised client-server architectures. Third, we are currently experiencing a dramatic shift in the roles of consumers in the Internet. The times have gone when quality content was only delivered by publishers and news agencies. Wikis and other Web 2.0 tools empower consumers to produce and
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