From StPowla processes to SRML models

Abstract

Abstract. Service Oriented Computing is a paradigm for developing software systems as the composition of a number of services. Services are loosely coupled entities, that can be dynamically published, discovered and invoked over a network. The engineering of such systems presents novel challenges, mostly due to the dynamicity and distributed nature of service-based applications. In this paper, we focus on the modelling of service orchestrations. We discuss the relationship between two languages developed under the SENSORIA project: SRML as a high level modelling language for Service Oriented Architectures, and STPOWLA as a process-oriented orchestration approach that separates core business processes from system variability at the end-user's level, where the focus is towards achieving business goals. A fundamental challenge of software engineering is to correctly align business goals with IT strategy, and as such we present an encoding of STPOWLA to SRML. This provides a formal framework for STPOWLA and also a separated view of policies representing system variability that is not present in SRML.

A structured approach to VO reconfigurations through Policies

“…APPEL was specialised to the domain of workflows, by making precise the triggers, conditions and actions that are possible in the domain of workflow adaptation [15] and [3] are concerned with refinement and reconfiguration policies respectively.…”