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Web Service Compositions (WSC), as part of a Service-Oriented Architecture (SOA), have to be managed to ensure compliance with guaranteed service levels. In this context, a high degree of automation is desired, which can be achieved by applying autonomic computing concepts. This paper particularly focuses the autonomic management of semi-dynamic compositions. Here, for each included service several variants are available that differ with regard to the service level they offer. Given this scenario, the authors first show how to instrument WSC in order to allow a controlling of the service level through switching the employed service variant. Second, they show how the desired self-manageability can be designed and implemented by means of a WSC manageability infrastructure.
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