In the field of distributed autonomous computing the current trend is to develop cooperating computational entities enabled with enhanced self-* properties. The expression self-* indicates the possibility of an element inside an ensemble, i.e. a set of collaborative autonomic components, to self organize, heal (repair), optimize and configure with little or no human interaction. We focus on a self-* property called Self-Expression, defined as the ability to deploy run-time changes of the coordination pattern of the observed ensemble; the goal of the ensemble is to achieve adaptivity by meeting functional and non-functional requirements when specific tasks have to be completed. The purpose of this paper is to rigorously present the mechanisms involved whenever a change in the coordination pattern is needed, and the interactions that take place. To this aim, we use SCEL (Software Component Ensemble Language), a formal language for describing autonomic components and their interactions, featuring an highly dynamic and flexible way to form ensembles based on components' attributes.
Self-Expression and Dynamic Attribute-based Ensembles in SCEL / Cabri, Giacomo; Capodieci, Nicola; Luca, Cesari; Rocco De, Nicola; Rosario, Pugliese; Francesco, Tiezzi; Zambonelli, Franco. - STAMPA. - 8802:(2014), pp. 147-163. (Intervento presentato al convegno 6th International Symposium on Leveraging Applications of Formal Methods, Verification and Validation, ISoLA 2014 tenutosi a Imperial, Corfu, Greece nel 08-11 October 2014).