Software Design Engineering

Download Architecting Dependable Systems II by Rogério de Lemos, Cristina Gacek, Alexander Romanovsky PDF

By Rogério de Lemos, Cristina Gacek, Alexander Romanovsky

As software program platforms develop into ubiquitous, the problems of dependability turn into increasingly more serious. on condition that recommendations to those matters has to be taken into consideration from the very starting of the layout technique, it truly is acceptable that dependability is addressed on the architectural point. This book results from an attempt to assemble the study groups of software program architectures and dependability. encouraged via the ICSE 2003 Workshop on software program Architectures for in charge structures, the publication specializes in themes suitable to enhancing the cutting-edge in architecting accountable platforms. The 15 completely reviewed papers originate in part from the workshop; others have been solicited on the way to in achieving entire insurance of all correct points. The papers are equipped into topical sections on architectures for dependability, fault-tolerance in software program architectures, dependability research in software program architectures, and commercial adventure.

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However, due to the increasingly dynamic character of today’s computing environments such as service-based architectures we often do not have a static system architecture. When further considering dynamic systems where no static a priori known system configuration exists, the analysis and prediction of the reliability or availability using a model of the overall configuration is difficult. We therefore propose to build dynamic * This work was developed in the course of the Special Research Initiative 614 – Self-optimizing Concepts and Structures in Mechanical Engineering – University of Paderborn, and was published on its behalf and funded by the Deutsche Forschungsgemeinschaft.

Since availability is determined by MTTF /(MTTF + MTTR) (cf. [21]), we can reach higher availability by reducing the mean time to repair. We can configure the MTTR by changing the lease given by the Jini lookup service, the monitoring period and the responsibility lease. Therefore, the proposed architecture can be customized for the required degree of availability subject to the condition that the number of working monitors, service description storages is sufficient. Two other parameters affect the availability of application services.

Therefore we extended the rule type information in the XML meta file, adding for each condition parameter the following information: an SQL expression that can be used to obtain the parameter value; the list of tables that must be queried to obtain the parameter value; a join condition between those tables. Fig. 2 shows a fragment of the meta information for the debt calculation service. There we see, for example, that in order to obtain the value of the product type parameter we have to write the following query: Using this information we can now take a rule condition and transform it into a SQL fragment.

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