A Graph Grammar-Based Dynamic Reconfiguration for Virtualized Web Service-Based Composite Architectures

摘要

Adaptation of deployment is required for maintaining the Quality of Service (QoS) in Service Oriented Architectures (SOA). Dynamic reconfiguration of SOA is proposed here to cope with adaptation in reaction to or in prediction of QoS degradation. Handling such an issue needs to detect and to identify the deficiency source, and to reconfigure the architecture implementing service composition. System reconfiguration constitutes a complex activity acting on distributed software entities, and requires to be implemented by correct model-based approaches. We show in this chapter how graph grammars can be used to design policy-driven reconfiguration mechanisms of architectures and to rule application adaptation using reconfiguration laws. We describe how coordinated architectural actions and reconfiguration policies are used to maintain QoS at runtime.