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Efficient application provisioning is one of the most important issues in Cloud Computing today. For that purpose, various provisioning automation technologies have been developed that can be generally categorized into two different flavors: (i) declarative approaches are based on describing the desired goals whereas (ii) imperative approaches are used to describe explicit sequences of low-level tasks. Since modern Cloud-based business applications become more and more complex, employ a plethora of heterogeneous components and services that must be wired, and require complex configurations, the two kinds of technologies have to be integrated to model the provisioning of such applications. In this paper, we present a process modelling concept that enables the seamless integration of imperative and declarative provisioning models and their technologies while preserving the strengths of both flavors. We validate the technical feasibility of the approach by applying the concept to the workflow language BPEL and evaluate its features by several criteria.

A Modelling Concept to Integrate Declarative and Imperative Cloud Application Provisioning Technologies