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
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Book ChapterDOI
Knowledge sifter: Agent-based ontology-driven search over heterogeneous databases using Semantic Web Services
Larry Kerschberg,Mizan Chowdhury,Alberto Damiano,Hanjo Jeong,Scott A. Mitchell,Jingwei Si,Stephen F. Smith +6 more
TL;DR: A proof-of-concept implementation shows how Knowledge Sifter can search geo-spatial ontology services such as the USGS Geographic Names Information System and Princeton University’s WordNet as well as image databases including Lycos and TerraServer.
Book ChapterDOI
Improving reuse of web service compositions
TL;DR: A novel approach is proposed that implements the steps of such methodology, providing an efficient manner for developing service compositions and enhancing the expressiveness of target composition languages like BPEL4WS.
Book ChapterDOI
A new methodology of qos evaluation and service selection for ubiquitous computing
TL;DR: A suit of user-oriented models and methods that support dynamic QoS evaluation and adaptive service selection for UbiComp is presented in this paper, where a useroriented QoS model with hierarchical structure is proposed to achieve scalability and flexibility.
Efficient Approach Towards an Agent-Based Dynamic Web Service Discovery Framework with QoS Support
TL;DR: A model of QoS-based Web services discovery is proposed that combines an augmented UDDI registry to publish the QoS information and a reputation manager to assign reputation scores to the services based on customer feedback of their performance, to give Web services consumers some confidence about the quality of services of the discovered Web services.
Proceedings ArticleDOI
Self-optimisation of the energy footprint in service-oriented architectures
TL;DR: This paper presents an approach for self-optimisation of the energy consumption at the application layer using Service-Oriented Architectures, since they allow rapid and seamless service composition and eases the application adaptation.
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.