Read e-book online Architecting Dependable Systems PDF

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By Paulo Esteves Veríssimo, Nuno Ferreira Neves, Miguel Pupo Correia (auth.), Rogério de Lemos, Cristina Gacek, Alexander Romanovsky (eds.)

As software program platforms develop into an increasing number of ubiquitous, the problems of dependability develop into an increasing number of severe. on condition that ideas to those matters has to be deliberate initially of the layout strategy, it really is acceptable that those concerns be addressed on the architectural level.

This ebook is electrified by means of the ICSE 2002 Workshop on Architecting liable structures; it truly is dedicated to present subject matters suitable for bettering the state-of-the-art for architecting dependability. many of the thirteen peer-reviewed papers offered have been at first awarded on the workshop, others have been invited in an effort to in attaining efficient and whole insurance of all correct elements. The papers are equipped in topical sections on

- architectures for dependability

- fault tolerance in software program architectures

- dependability research in software program architectures

- commercial experience.

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To this end, we have leveraged an architecture description language (ADL) [16] and a family of architectural implementation platforms [23]. The specific objective of our work is to minimize the interdependencies of components, such that new component versions may be added to a (running) system more easily. In particular, we employ explicit software connectors as component intermediaries [2,27,31,35]. By "explicit software connectors" we mean implementation-level facilities [23] that directly correspond to the much more frequently used architectural model-level software connectors [35].

On protection at the level of the object method call [26]. The authorization service is a distributed TTP which can be used to grant or deny authorization for complex operations combining several method calls. The service relies on a local security kernel. The third line of work was on formalizing the core concepts of MAFTIA and verifying and assessing the work on dependable middleware [27]. A novel rigorous model for the security of reactive systems was developed and protocols were modelled using CSP and FDR.

Second, multiple versions of a given system may be deployed in the field [16]; each such system version may employ different versions of (different) components, rendering the "off-line" testing approach impractical. Third, assuming that the new component version passes a "quaUty threshold" such that the engineer decides to add it to the deployed system (either as a replacement for the old version or in addition to the old version), the above strategy does not make any provisions for deploying such a component without disrupting the operation of the running system(s).

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