By Rogério de Lemos, Cristina Gacek, Alexander Romanovsky
As software program structures develop into ubiquitous, the problems of dependability develop into progressively more serious. on condition that options to those concerns has to be taken into 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 assemble the learn groups of software program architectures and dependability. encouraged through the ICSE 2003 Workshop on software program Architectures for liable structures, the booklet makes a speciality of themes appropriate to bettering the state-of-the-art in architecting liable platforms. The 15 completely reviewed papers originate in part from the workshop; others have been solicited which will in attaining whole insurance of all suitable points. 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 business event.
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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.
Fig. 2. Scenario of a node failure In the case of failures in the responsible monitor as well as in the monitored service, the responsibility lease of the monitor expires and another monitor takes over the supervising responsibility. This monitor replaces the failed monitor, and starts supervising the currently unmonitored service which includes starting new instances when needed. Figure 3 shows the events in a sequence diagram, in the case that a service and its supervising monitor are executed on the same node, which experiences a failure.
Failures of a responsible monitor and monitored application services, are possible. The case that neither a responsible monitor nor a monitored service is affected by the node failure is trivial. If a node is affected by the failure, which does host only application services, the monitors responsible for these application services will detect the services’ failures because the application services do A Self-optimizing Run-Time Architecture for Configurable Dependability of Services 33 not renew their leases with the lookup service.
Architecting Dependable Systems II by Rogério de Lemos, Cristina Gacek, Alexander Romanovsky