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Astract: With the introduction of fUML, an OMG standard defining the operational semantics of a subset of UML and the conforming virtual machine, UML models can be used not only for informal design sketching but also for completely building executable systems. Although this has been an important step for UML, the full potential of having executable UML models, such as enabling runtime analysis and adaptation, cannot be realized using the standardized virtual machine due to the lack of the adequate means for accessing important runtime information and controlling the execution of UML models. In this paper, we aim at establishing the necessary basis to overcome this limitation. Therefore, we introduce extensions of the standardized fUML virtual machine in terms of a dedicated trace model, an event model, and a command API. We provide an open-source implementation of the proposed extensions, as well as a model debugger for UML models based on this implementation to demonstrate the feasibility of the presented concepts.

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Astract: The employment of optimistic model versioning systems allows multiple developers of a team to work independently on their local copies of a software model. The merging process towards one consolidated version obviously turns out to be error-prone and time-consuming when performed without any tool support. Recently, several sophisticated approaches for model merging have been presented. However, even for multi-view modeling languages like UML, which distribute the information on the modeled system over different views, these views are merged independently of each other. Hence, inconsistencies are likely to be introduced into the merged model. We suggest to solve this problem by exploiting information stored in one view as constraint for the computation of a consolidated version of another view. More specifically, we demonstrate how state machines can guide the integration of parallel changes performed on a sequence diagram. We give a concise formal description of this problem and suggest a translation to the satisfiability problem of propositional logic.

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Astract: In this paper, we discuss how to make a generic model versioning system language-specific by using various adaptation techniques. In particular, we recap some lessons learned during the AMOR project and outline some open challenges for adaptable model versioning systems.

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