Approach and Realization of a Multi - tenant aware Process Model Registry

Background The SimTech Cluster of Excellence [1] studies multi-scale and multi-physics simulation methods. These methods aim for combining different scales (e.g. cells, tissue, bone, skeleton) and different physics (e.g. mechanics, thermodynamics, quantum physics) into one overall simulation. The Institute of Architecture of Application Systems (IAAS) has built a Workflow Management System (WfMS) that is tailored specifically for the requirements and needs of scientists [2]. The workflow system allows to model simulations as workflows in order to make them more flexible and improve automation. The workflows can be modeled, executed, adapted, monitored, and analyzed. The current system orchestrates different simulation components into one workflow using either only one scale or an approximation of all physics/scales onto one scale. In order to extend the system for handling the coupling of separate simulation workflows operating on different scales and physics we want to introduce the notion of choreographies to simulations. Choreographies are coordinated interactions between so-called participants, i.e. orchestrations/workflows, without a central controlling mechanism. We use the choreography language BPEL4Chor [7], [8] to model choreographies of simulation workflows. A BPEL4Chor choreography itself is not executable but can be transformed into BPEL [11] workflows that represent the participants in a choreography. As first step towards the support of collaborative modeling and execution of such choreographies, in [4] the SimTech workflow engine is extended with multi-tenancy support (SCE) and integrated into a multi-tenant Enterprise Service Bus (ESB) [5], [6].