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 turn into ubiquitous, the problems of dependability develop into progressively more serious. provided that options to those matters has to be taken under consideration from the very starting of the layout procedure, it truly is applicable that dependability is addressed on the architectural point. This book results from an attempt to compile the study groups of software program architectures and dependability. encouraged by way of the ICSE 2003 Workshop on software program Architectures for responsible structures, the booklet specializes in subject matters suitable to bettering the state-of-the-art in architecting accountable platforms. The 15 completely reviewed papers originate partially from the workshop; others have been solicited for you to in achieving entire insurance of all proper features. 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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7. Self-optimizing availability controller 5 Ensuring Reliability of Application Services As outlined in the preceding section, the presented infrastructure of the architecture can ensure a required degree of availability for a group of application services by restarting failed ones. Due to failures, application services are failing over time and are restarted on other nodes in the network by the architecture. Reliability is known as the probability that an item will perform its required function under given conditions for a stated time interval [21].

Fault tolerance source code can be integrated in one smart proxy, since the proxy is executed in the same process as the using service. Therefore, the smart proxy cannot fail independently from the using service in case of failures. Thus, the using service does not need to include fault tolerance measures in the collaboration with the smart proxy. Analogue to the redundancy of services a key point for dependability is the availability of data in a distributed system. This can be achieved by the use of replication.

The approach is also practical from the efficiency point of view. The overhead imposed by the configurator’s operations (finding the rules, passing action parameter values, and creating coordination contract objects) does not have a major impact into the overall execution time of the application and processing services. This is both true for the interactive and batch parts of the system. In the former case, the user does not notice any delay in the system’s reply, in the latter case, the time of generating the SQL procedures is negligible compared to the time they will execute over the hundreds of thousands of records in the database.

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