Get Architecting Dependable Systems II PDF

By Rogério de Lemos, Cristina Gacek, Alexander Romanovsky

ISBN-10: 3540231684

ISBN-13: 9783540231684

ISBN-10: 3540259392

ISBN-13: 9783540259398

As software program structures turn into ubiquitous, the problems of dependability develop into increasingly more severe. provided that options to those concerns needs to be taken into consideration from the very starting of the layout approach, it truly is acceptable that dependability is addressed on the architectural point. This book results from an attempt to collect the examine groups of software program architectures and dependability. encouraged through the ICSE 2003 Workshop on software program Architectures for in charge platforms, the ebook specializes in subject matters appropriate to bettering the state-of-the-art in architecting accountable platforms. The 15 completely reviewed papers originate in part from the workshop; others have been solicited with the intention to in achieving whole insurance of all correct 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 business adventure.

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8]). One of its features is a lookup service that remains operational, even when single nodes in the network have crashed, due to redundancy and replicated data by the usage of multicast messages. The leasing principle extends the allocation of resources with time [9]. The lease represents a period of time during which the resource is offered. Therefore, this lease needs to be extended (renewed) if the resource remains to be offered after the timeout of the lease. If the owner of the resource fails to renew the lease, a client can assume that the resource is no longer available.

Obviously, the values of most of the relevant parameters change over time and therefore can only be approximated by their expected mean values. A first category of parameters are configurable parameters, which allow to adjust the system behavior to the required bounds: Monitoring period As described in Section 3 the monitor checks periodically, whether all of its monitored service instances are executed. Decreasing this monitor period leads to faster recognition of service failures but higher resource consumption.

The proxy instance is registered in the lookup service. If a service is to be used by a client, the proxy instance is downloaded as mobile code to the client and executed there. Therefore, the service can execute code on the client’s side in addition to code on the backend. Redundancy of service instances is a key factor to achieve a required degree of reliability. A non redundant service is a single-point-of-failure. Thus, in case of a failure of this service or a communication subsystem failure, which results in a network partition, all dependent clients of that service cease to work.

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

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