Abstract
Services are capabilities that enable applications and are of
crucial importance to pervasive computing in next-generation networks.
Service Composition is the construction of complex services from primitive
ones; thus enabling rapid and flexible creation of new services. The presence
of multiple independent service providers poses new and significant
challenges. Managing trust across providers and verifying the performance of
the components in composition become essential issues. Adapting the composed
service to network and user dynamics by choosing service providers and
instances is yet another challenge. In SAHARA1, we are developing a
comprehensive architecture for the creation, placement, and management of
services for composition across independent providers. In this paper, we
present a layered reference model for composition based on a classification
of different kinds of composition. We then discuss the different overarching
mechanisms necessary for the successful deployment of such an architecture
through a variety of case-studies involving composition.
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