Run-Time Evolution through Explicit Meta-Objects

Ressia, Jorg; Renggli, Lukas; Girba, Tudor; Nierstrasz, Oscar (2010). Run-Time Evolution through Explicit Meta-Objects. In: Bencomo, Nelly; Blair, Gordon; Fleurey, Franck; Jeanneret, Cédric (eds.) Proceedings of the 5th Workshop on Models@run.time at the ACM/IEEE. 13th International Conference on Model Driven Engineering Languages and Systems (MODELS 2010).

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Software must be constantly adapted due to evolving domain knowledge and unanticipated requirements changes. To adapt a system at run-time we need to reflect on its structure and its behavior. Object-oriented languages introduced reflection to deal with this issue, however, no reflective approach up to now has tried to provide a unified solution to both structural and behavioral reflection. This paper describes Albedo, a unified approach to structural and behavioral reflection. Albedo is a model of fined-grained unanticipated dynamic structural and behavioral adaptation. Instead of providing reflective capabilities as an external mechanism we integrate them deeply in the environment. We show how explicit meta-objects allow us to provide a range of reflective features and thereby evolve both application models and environments at run-time.

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