By Joyce L. Tokar (auth.), Rogério de Lemos, Cristina Gacek, Alexander Romanovsky (eds.)
As software program structures develop into ubiquitous, the problems of dependability turn into progressively more an important. on condition that suggestions to those matters has to be thought of from the very starting of the layout procedure, it truly is average that dependability is addressed on the architectural point. This ebook was once born of an attempt to compile the study groups of software program architectures and dependability.
This cutting-edge survey includes 18 extended and peer-reviewed papers in accordance with the rigorously chosen contributions to the Workshop on Architecting liable structures (WADS 2006), geared up on the 2006 foreign convention on accountable platforms and Networks (DSN 2006), held in Philadelphia, PA, united states, in June 2006. It additionally encompasses a variety of invited papers written through well-known specialists within the region. The papers are equipped in topical sections on architectural description languages, architectural parts and styles, architecting disbursed structures, and architectural assurances for dependability.
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Additional info for Architecting Dependable Systems IV
Thus, the order may be chosen according to the context of the targeted analysis. Generally, fault tolerance and maintenance dependencies are modeled at the end, as their description strongly depends on the architecture. It is noteworthy that not all the details of the architectural model are necessary for the AADL dependability model. Only components that have associated error models and all connections and bindings between them are necessary. The rest of this subsection presents guidelines for modeling i) an architecturebased dependency and ii) a maintenance or recovery dependency.
A- -b- -c- Fig. 3. Architecture-based dependency The error model of Figure 4 is associated with Component 1. It takes into account the sender-side dependency from Component 1 to Component 2. This error model is an extension of the one of Figure 1 that represents the behavior of a component as if it were isolated. The error model of Figure 4 declares an out propagation Error (see line d1) in the type and an AADL transition triggered by the out propagation in the implementation (see line d2). general associated with Component 2 is not shown here but is similar.
Rugina, K. Kanoun, and M. general; Fig. 4. Error model example with dependency In real applications, architecture-based dependencies usually require describing how error propagations from multiple sources are handled by the receiver component. This is achieved by using Guard properties in which Boolean expressions are used to specify the consequences of a set of propagations occurring in a set of sender components on a receiver component. 2 Maintenance and Recovery Dependency Modeling Maintenance dependencies need to be described when repair facilities are shared between components or when the maintenance or repair activity of some components has to be carried out according to a given order or a specified strategy.
Architecting Dependable Systems IV by Joyce L. Tokar (auth.), Rogério de Lemos, Cristina Gacek, Alexander Romanovsky (eds.)