By Rogério de Lemos, Cristina Gacek, Alexander Romanovsky

As software program structures turn into ubiquitous, the problems of dependability develop into increasingly more severe. on condition that strategies to those concerns 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 examine groups of software program architectures and dependability. encouraged via the ICSE 2003 Workshop on software program Architectures for liable structures, the publication makes a speciality of themes appropriate to bettering the cutting-edge in architecting accountable structures. The 15 completely reviewed papers originate in part from the workshop; others have been solicited so as to in achieving whole assurance of all suitable facets. The papers are geared up 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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It has been specially designed to support the development of dependable distributed systems (cf. [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.

Additionally, JavaSpaces can be used as participants in the Jini implementation of the Two-Phase-Commit-Protocol [20]. The backends store the data and an associated version number. The smart proxy does a lookup on the lookup service gathering the required number of available JavaSpaces for a read respective write access. Executing a write access, the proxy simply writes the data in all gathered JavaSpaces using the Two-Phase-CommitProtocol and increments the version number. Executing a read access is slightly more complex.

A steady-state analysis of the modeled behavior gives quantitative results for the availability of a single service group managed by the architecture. We give a short introduction to GSPNs in Appendix A. t. crash failures. In our example scenario, we have three instances of a certain application service group which are executed by the architecture. Further we will use the term service groups for one group of identical application services. e. one service instance is sufficient for performing the required function (1-out-of-3 redundancy).

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