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Ph. Leitner, B. Wetzstein, D. Karastoyanova, W. Hummer, S. Dustdar, F. Leymann:
"Preventing SLA Violations in Service Compositions Using Aspect-Based Fragment Substitution";
Talk: 8th International Conference on Service-Oriented Computing (ICSOC 2010), San Francisco, CA, USA; 2010-12-07 - 2010-12-10; in: "Service-Oriented Computing Proceedings of the 8th International Conference (ICSOC 2010)", P. Maglio, M. Weske, J. Yang, M. Fantinato (ed.); Springer, LNCS 6470 (2010), ISBN: 978-3-642-17357-8; 365 - 380.

In this paper we show how the application of the aspectoriented
programming paradigm to runtime adaptation of service compositions
can be used to prevent SLA violations. Adaptations are triggered
by predicted violations, and are implemented as substitutions of fragments
in the service composition. Fragments are full-fledged standalone
compositions, and are linked into the original composition via special
activities, which we refer to as virtual activities. Before substitution we
evaluate fragments with respect to their expected impact on the performance
of the composition, and choose those fragments which are best
suited to prevent a predicted violation. We show how our approach can
be implemented using Windows Workflow Foundation technology, and
discuss our work based on an illustrative case study.