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Published in:
2008 | OriginalPaper | Chapter
Specifying Service Composition Using UML 2.x and Composition Policies
Authors : Judith E. Y. Rossebø, Ragnhild Kobro Runde
Published in: Model Driven Engineering Languages and Systems
Publisher: Springer Berlin Heidelberg
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In the current and future service environment, service parts are being developed separately while being dynamically combined at runtime. In this paper we address the problem of defining a model-driven process for enabling dynamic composition of services. Composition policies are used to define choices in behaviour under which service roles involved in a composite service can be dynamically combined at runtime. We model policy-ruled choreography of collaboration components using a policy enforcement state machine (PESM). We also define transformation rules for translating a global PESM diagram into a set of local PESM diagrams, one for each role. As an example, we consider the case of dynamically composing an existing service with a set of authentication and authorization collaborations. The approach is supported by a formal syntax and semantics.