NDLI: Flow-Based Service Selection forWeb Service Composition Supporting Multiple QoS Classes

Content Provider	IEEE Xplore Digital Library
Author	Cardellini, V. Casalicchio, E. Grassi, V. Lo Presti, F.
Copyright Year	2007
Description	Author affiliation: Univ. of Roma "Tor Vergata", Rome (Cardellini, V.; Casalicchio, E.; Grassi, V.; Lo Presti, F.)
Abstract	In the service oriented paradigm applications are created as a composition of independently developed Web services. Since the same service may be offered by different providers with different non-functional Quality of Service (QoS) attributes, a selection process is needed to identify the constituent services for a given composite service that best meet the users QoS requirements. In this paper, we consider a broker that offers a composite service with multiple QoS classes to several users each generating a flow of requests over time. We propose a service selection scheme which optimizes the end-to-end aggregated QoS of all incoming flows of requests by means of a simple linear programming problem which scales as the number of users, request volumes and/or services grows. This approach differs from most of the current proposals which may not scale well since: a) requests, even from the same user, are handled independently from one another; and b) the selection process often requires the solution of an NP-hard problem.
Starting Page	743
Ending Page	750
File Size	264371
Page Count	8
File Format	PDF
ISBN	0769529240
DOI	10.1109/ICWS.2007.91
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quality of service Web services Linear programming Concrete Proposals NP-hard problem Heuristic algorithms Genetic algorithms Delay Cost function
Content Type	Text
Resource Type	Article

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