Journal ArticleDOI
QoS issues in Web services
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TLDR
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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Proceedings ArticleDOI
QoS-Based Learning Services Composition for Ubiquitous Learning
TL;DR: This paper proposes an efficient service selection scheme to help teacher pick out learning services by considering two different contexts namely single QoS-based service discovery and QSOS-based optimization of service composition.
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A dynamically self-configurable service process engine
TL;DR: A novel service process engine that can be self-configured dynamically is introduced in the paper, based on the Jini platform, and leverages of Jini services to provide key functionalities.
Proceedings ArticleDOI
Model Driven Design of Distribution Patterns forWeb Service Compositions
Ronan Barrett,Claus Pahl +1 more
TL;DR: This paper proposes a novel Model Driven Architecture using UML 2.0, which takes existing Web service interfaces as its input and generates an executable Web service composition, based on a distribution pattern chosen by the software architect.
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Trustworthy Web services provisioning for differentiated customer services
Kaiqi Xiong,Harry G. Perros +1 more
TL;DR: This paper considers a set of computer resources used by a service broker to host enterprise applications for two classes of differentiated customer services subject to a service level agreement, and studies three QoS metrics, namely, trustworthiness, a percentile response time, and availability.
Journal ArticleDOI
QoS requirement generation and algorithm selection for composite service based on reference vector
TL;DR: This paper proposes to strengthen current service composition mechanism by generation of QoS requirement and its algorithm selection based on the QoS reference vectors which are calculated optimally from the existing individual services’ QoS by registry to represent QoS overview about the best QoS, the worst, or the average QoS of all composite services.
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.
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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.