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A Flexible Directory Query Language for the Efficient Processing of Service Composition Queries

A Flexible Directory Query Language for the Efficient Processing of Service Composition Queries
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Author(s): Walter Binder (University of Lugano, Switzerland), Ion Constantinescu (Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland) and Boi Faltings (Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland)
Copyright: 2008
Pages: 20
Source title: Electronic Government: Concepts, Methodologies, Tools, and Applications
Source Author(s)/Editor(s): Ari-Veikko Anttiroiko (University of Tampere, Finland)
DOI: 10.4018/978-1-59904-947-2.ch109

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Abstract

Service composition is a major challenge in an open environment populated by large numbers of heterogeneous services. In such a setting, the efficient interaction of directory-based service discovery with service composition engines is crucial. In this article we present a Java-based directory that offers special functionality enabling effective service composition. In order to optimize the interaction of the directory with different service composition algorithms exploiting application-specific heuristics, the directory supports user-defined selection and ranking functions written in a declarative query language. Inside the directory queries are transformed and compiled to JVM bytecode which is dynamically linked into the directory. The compiled query enables a best-first search of matching directory entries, efficiently pruning the search space.

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