2014

Journal

Journal of Universal Computer Science

With the growing demand on Web Services, self-adaptation in the highly-dynamic
environment is becoming a key capability of service-based systems. As a solution for Web
services to provide added value and high QoS, combining self-* and policies allows reducing
management complexity and effectively drives adaptation. Also, providers must participate in
the self-adaptation process as they are aware of the capabilities of their offered services and
exceptions that may occur. Despite the important role of service providers, existing approaches
did not address this major issue. Thus, the description of self-adaptive Web services must not
be limited to functional and QoS data. To address these issues, we extend the WS-Policy
framework to represent capabilities and requirements of self-* Web services. We also extend
UDDI in order to store and manage service policies, as the current UDDI model does not offer
these capabilities. Finally, we propose an ECA-based planning mechanism to specify decision
making in the self-adaptation process.

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