Automatic Refinement of Service Compositions

Abstract

Abstract. We propose a method for the automatic refinement of web service compositions: given a composite web service specification over abstract modules, our method generates lower-level versions of this composition. The refinement process is based on query rewriting techniques extended to take into account not only functional and non-functional requirements but also semantic information. Experimental results illustrate the performance and scalability of the method.

Towards a Secure Database Integration Using SLA in a Multi-cloud Context

“…The next step supervised by the ICL consists in elaborating a set of potential composition specifications via a query rewriting process. Given the user query, specified as a set of abstract operations and the available services, specified in the same way, we use a Local-as-View approach [11] to obtain a combination of services that match the query 2 Azure is a trademark of Microsoft Corporation. specification.…”

“…specification. The algorithm in [11] is being modified to deal with agreedSLA and QoS user preferences.…”

“…The query rewriting problem can be generalized to the case of services: The query to be rewritten is seen as an abstract service composition, to be expressed in terms of concrete services. Query rewriting techniques have been adapted to the context of data providing services [12], [13] as well as for general service compositions [11]. The latter case (i.e, services that maintain and update information) is a generalization of the data provision case.…”

“…The approach proposed in [11] is being extended to the case of SLA-guided service-based data integration. Let us consider the MOOC scenario, where people can participate on a content trading pool.…”

“…It is worth to notice that the algorithm in [11] shows an exponential behavior, since it produces all combinations of concrete services that satisfy the abstract specification. In order to solve this problem, we propose to use the agreed SLA and user preferences to guide the choice of concrete services, to allow that the most preferred ones are combined first.…”