[Back]

A. Michlmayr, F. Rosenberg, Ph. Leitner, S. Dustdar:
"Comprehensive QoS Monitoring of Web Services and Event-Based SLA Violation Detection";
Talk: 4th Workshop on Middleware for Service Oriented Computing (MW4SOC 2009) held at the ACM/IFIP/USENIX Int. Middleware Conference, Urbana Champaign, Illinois, USA; 11-30-2009 - 12-04-2009; in: "Proceedings of the 4th Workshop on Middleware for Service Oriented Computing (MW4SOC 2009) held at the ACM/IFIP/USENIX Int. Middleware Conference", K. Göschka, S. Dustdar, F. Leymann, H. Paik (ed.); ACM, (2009), ISBN: 978-1-60558-848-3; 1 - 6.

In service-oriented systems, Quality of Service represents an
important issue which is often considered when selecting and
composing services. For receiving up-to-date information,
non-functional properties such as response time or availabil-
ity can be continuously monitored using server- or client-
side approaches. However, both approaches have strengths
and weaknesses. In this paper, we present a framework that
combines the advantages of client- and server-side QoS mon-
itoring. It builds on event processing to inform interested
subscribers of current QoS values and possible violations of
Service Level Agreements. These events can trigger adaptive
behavior such as hosting new service instances if the QoS is
not as desired. We describe our QoS monitoring approach
in detail, show how it was integrated into the VRESCo ser-
vice runtime environment, and evaluate the accuracy of the
presented monitoring techniques.

Project Head Schahram Dustdar:
S-Cube