By Rogério de Lemos, Cristina Gacek, Alexander Romanovsky
ISBN-10: 3540231684
ISBN-13: 9783540231684
ISBN-10: 3540259392
ISBN-13: 9783540259398
As software program platforms develop into ubiquitous, the problems of dependability turn into progressively more severe. provided that ideas to those concerns needs to be taken under consideration from the very starting of the layout procedure, it's 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 via the ICSE 2003 Workshop on software program Architectures for in charge structures, the e-book specializes in issues proper to enhancing the cutting-edge in architecting in charge platforms. The 15 completely reviewed papers originate in part from the workshop; others have been solicited that allows you to in achieving whole 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 business adventure.
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This leads us to the concept of a smart proxy [12,13]. A smart proxy is not restricted to forwarding but can be used much more flexible. Thus, in the context of reliability the proxy may communicate with multiple backends at once to recover from or mask failures. A client trying to use a service, which has failed although its lease time has not expired, would experience a failure in a proxy-less environment. However, after being downloaded to a client a mobile code proxy, which is stored in the lookup service and thus fails independently from its backend, can revert to another service backend when it detects the failure of its own backend.
Following [15], it is also named a self-optimizing controller. As depicted in Figure 7, the basic control loop in the system is built by the service group and the monitor. The service group represents the controlled process. It can be influenced by the monitor by restarting crashed services. The feedback from the process to the monitor is only implicitly present in the architecture. The monitor periodically checks via the lookup service if a specific service has not crashed. 40 Matthias Tichy and Holger Giese The availability of the application service group is influenced by the service failure rate The measured availability of the application services is fed into the parameter identification unit.
In other words, we execute the same call as if it Enhancing Dependability Through Flexible Adaptation 21 were an application service, but passing one of the already created objects as data. The steps then proceed as usual. This means that after step 7, we obtain a service instance that has been configured according to the rule corresponding to the given object. The generation of the SQL code for the batch version of a service proceeds as follows, for each from 1 to (where is the number of rules for that service).
Architecting Dependable Systems II by Rogério de Lemos, Cristina Gacek, Alexander Romanovsky
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