A Compositional Formalization of Connector Wrappers

Bridget Spitznagel, and David Garlan

The 2003 International Conference on Software Engineering (ICSE'03), Portland, Oregon, USA, May 3 - 10, 2003.

Online links: Postscript PDF

Increasingly systems are composed of parts: software components, and the interaction mechanisms (connectors) that enable them to communicate. When assembling systems from independently developed and potentially mismatched parts, wrappers may be used to overcome mismatch as well as to remedy extra-functional deficiencies. Unfortunately the current practice of wrapper creation and use is ad hoc, resulting in artifacts that are often hard to reuse or compose, and whose impact is difficult to analyze. What is needed is a more principled basis for creating, understanding, and applying wrappers. Focusing on the class of connector wrappers (wrappers that address issues related to communication and compatibility), we present a means of characterizing connector wrappers as protocol transformations, modularizing them, and reasoning about their properties. Examples are drawn from commonly practiced dependability enhancing techniques.

For further information, please visit the home pages of the ABLE research project and Carnegie Mellon University's Composable Systems Group.

Last modified: 6/25/2003. For comments and problems, contact able-help@cs.cmu.edu.