Journal ArticleDOI
QoS issues in Web services
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QoS measures can include the maximum throughput or a function that describes how throughput varies with load intensity, which can be measured in terms of arrival rates (such as requests per second) or number of concurrent requests.Abstract:
Quality of service (QoS) is a combination of several qualities or properties of a service, such as: availability is the percentage of time that a service is operating; security properties include the existence and type of authentication mechanisms the service offers, confidentiality and data integrity of messages exchanged, nonrepudiation of requests or messages, and resilience to denial-of-service attacks; response time is the time a service takes to respond to various types of requests; Response time is a function of load intensity, which can be measured in terms of arrival rates (such as requests per second) or number of concurrent requests. QoS takes into account not only the average response time, but also the percentile of the response time; and throughput is the rate at which a service can process requests. QoS measures can include the maximum throughput or a function that describes how throughput varies with load intensity. The QoS measure is observed by Web services users. These users are not human beings but programs that send requests for services to Web service providers. QoS issues in Web services have to be evaluated from the perspective of the providers of Web services and from the perspective of the users of these services.read more
Citations
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Journal ArticleDOI
A framework for QoS-aware binding and re-binding of composite web services
TL;DR: This paper proposes a QoS-aware binding approach based on Genetic Algorithms that includes a feature for early run-time re-binding whenever the actual QoS deviates from initial estimates, or when a service is not available.
Journal ArticleDOI
Composing Web services: a QoS view
TL;DR: In previous columns, I've examined how quality of service (QoS) comes into play for service providers, consumers, and parallel transactions, and here, I'll show how it fits into composite Web services.
Patent
Reputation system for web services
TL;DR: In this article, a system and method for automating the web service selection based on reputation information, to help negotiate a contractual web service binding between a client and a server is presented.
Book ChapterDOI
A qos-aware selection model for semantic web services
TL;DR: A QoS-based selection of services is proposed using the Web Services Modeling Ontology for annotating service descriptions with QoS data and a fair and dynamic selection mechanism is presented, using an optimum normalization algorithm.
Journal ArticleDOI
An optimal QoS-based Web service selection scheme
TL;DR: This study proposes an efficient service selection scheme to help service requesters select services by considering two different contexts: single QoS-based service discovery and QoS -based optimization of service composition.
References
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Journal ArticleDOI
Unraveling the Web services web: an introduction to SOAP, WSDL, and UDDI
Francisco Curbera,Matthew J. Duftler,Rania Khalaf,William A. Nagy,Nirmal K. Mukhi,Sanjiva Weerawarana +5 more
TL;DR: This tutorial explores the most salient and stable specifications in each of the three major areas of the emerging Web services framework, which are the simple object access protocol, the Web Services Description Language and the Universal Description, Discovery, and Integration directory.
Journal ArticleDOI
Session-based admission control: a mechanism for peak load management of commercial Web sites
Ludmila Cherkasova,P. Phaal +1 more
TL;DR: It is shown that a Web server augmented with the admission control mechanism is able to provide a fair guarantee of completion, for any accepted session, independent of a session length, which is a critical requirement for any e-business.