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Research in Software Architectures has put forward the concept of connector to express complex relationships between system components, thus facilitating the separation of coordination from computation. A system can then be understood, at a given level of abstraction, in terms of its components and the connectors that establish how they interact. However, for systems in which many interconnections exist between their components, the architectures themselves may become very complex due to the high number of connectors in place. This is especially true in the context of mobile systems in which the interconnections are, by nature, transient in the sense that, at a given instant of time, only a subset of the potential connectors are actually effective. In this paper, we formalise a notion of transient connector that allows, at any given moment, for the architecture to depict only the connectors that are active and, in this way, capture the dynamics of architectures themselves. Our approach is based on the use of Community, a Unity-like program design language that has a semantics in Category Theory, and rewriting logic as a means of capturing the dynamic aspects of connectors
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Department of Informatics, University of Lisbon