Dynamic Role Binding in a Service Oriented Architecture

Many services are provided by a structure of service components that are dynamically bound and performed by system components. Service modularity requires that service components can be developed separately, deployed dynamically and then used to provide situated services without undesirable service interactions. In this paper we introduce a two-dimensional approach where service components are roles defined using UML 2.0 collaborations and system components are agents representing domain entities such as users and terminals. The process of dynamic role binding takes place during service execution and provides general mechanisms to handle context dependency, personalisation, resource limitations and compatibility validation. A policy framework for these mechanisms is outlined.

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