NDLI: QoS-aware replanning of composite Web services

Content Provider	IEEE Xplore Digital Library
Author	Canfora, G. Di Penta, M. Esposito, R. Villani, M.L.
Copyright Year	2005
Description	Author affiliation: Res. Centre on Software Technol., Sannio Univ., Italy (Canfora, G.; Di Penta, M.; Esposito, R.; Villani, M.L.)
Abstract	Run-time service discovery and late-binding constitute some of the most challenging issues of service-oriented software engineering. For late-binding to be effective in the case of composite services, a QoS-aware composition mechanism is needed. This means determining the set of services that, once composed, not only will perform the required functionality, but also will best contribute to achieve the level of QoS promised in service level agreements (SLAs). However, QoS-aware composition relies on estimated QoS values and workflow execution paths previously obtained using a monitoring mechanism. At run-time, the actual QoS values may deviate from the estimations, or the execution path may not be the one foreseen. These changes could increase the risk of breaking SLAs and obtaining a poor QoS. Such a risk could be avoided by replanning the service bindings of the workflow slice still to be executed. This paper proposes an approach to trigger and perform composite service replanning during execution. An evaluation has been performed simulating execution and replanning on a set of composite service workflows.
Starting Page	121
Ending Page	129
File Size	455790
Page Count	9
File Format	PDF
ISBN	0769524095
DOI	10.1109/ICWS.2005.96
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Web services Runtime Concrete Software engineering Monitoring Performance evaluation Delay Cost function Web Services Dynamic binding Replanning Composite
Content Type	Text
Resource Type	Article

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