Towards a QoS Modeling and Modularization Framework for Component-based Systems

Current domain-specific modeling (DSM) frameworks for designing component-based systems provide modeling support for system´s structural as well as non-functional or quality of service (QoS) concerns. However, the focus of such frameworks on system´s non-functional concerns is an after-thought and their support is at best adhoc. Further, such frameworks lack strong decoupling between the modeling of the system´s structural composition and their QoS requirements. This lack of QoS modularization limits (1) reusability of such frameworks, (2) ease of their maintenance when new non-functional characteristics are added, and (3) independent evolution of the modeling frameworks along both the structural and non-functional dimensions. This paper describes Component QoS modeling language (CQML), which is a reusable, extensible, and platform-independent QoS Modeling Language that provides strong separation between the structural and non-functional dimensions. CQML supports independent evolution of structural metamodel of composition modeling languages as well as QoS metamodel. To evaluate, we superimpose CQML on a purely structural modeling language and automatically generate, configure, and deploy componentbased fault-monitoring infrastructure using aspect-oriented modeling (AOM) techniques.