A Formal Basis for Architectural Connection

Authors: Robert J. Allen and David Garlan

This is a revised version of the paper with the same title that appeared in ACM Transactions on Software Engineering and Methodology, July 1997.

Last updated June 1998

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Abstract

As software systems become more complex the overall system structure -- or software architecture -- becomes a central design problem. An important step towards an engineering discipline of software is a formal basis for describing and analyzing these designs. In this paper we present a formal approach to one aspect of architectural design: the interactions between components. The key idea is to define architectural connectors as explicit semantic entities. These are specified as a collection of protocols that characterize each of the participant roles in an interaction and how these roles interact. We illustrate how this scheme can be used to define a variety of common architectural connectors. We further provide a formal semantics and show how this leads to a system in which architectural compatibility can be checked in a way analogous to type checking in programming languages.


Keywords: software architecture, formal models, model checking, module interconnection, software analysis.

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