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

Walter Binder, Ion Constantinescu, Boi Faltings
Copyright: © 2007 |Pages: 21
DOI: 10.4018/jwsr.2007010104
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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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