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Cooperation Contracts

Authors: M. Schrefl, G. Kappel
Paper: Schr91b (1991)
Citation: Toby J. Teorey (ed.): Proceedings of the 10th International Conference on the Entity-Relationship Approach (ER 1991), Participants Proceedings, San Mateo, Calif., U.S.A., October 1991, pp. 285-307, 1991.
Resources: Copy  (In order to obtain the copy please send an email with subject  Schr91b  to dke.win@jku.at)
BibTeX


Abstract:

In this paper we introduce the concept of cooperative message handling, in which several objects act together in answering a message they have received jointly. cooperative message handling extends the traditional message passing paradigm which requires the receiver of a message to be a single object only. Cooperative messages are defined with cooperation contracts which are established between several object types. A cooperative message is sent to a tuple of instances, one for each object type in the cooperation contract. We show that cooperation contracts offer new benefits for behavior modeling in object-oriented database design. Behavior which is provided by several object types in concert needs not be dispersed and can be defined in a single place. Furthermore, behavior designs become symmetric, better maintainable and better extensible.