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 probabilistic approach to modeling and estimating the QoS of web-services-based workflows
TL;DR: This paper identifies a set of QoS metrics in the context of WS workflows, and proposes a unified probabilistic model for describing QoS values of a broader spectrum of atomic and composite Web services.
Journal ArticleDOI
Dynamic Web Service Selection for Reliable Web Service Composition
TL;DR: This paper studies the dynamic web service selection problem in a failure-prone environment and proposes two strategies to select Web services that are likely to successfully complete the execution of a given sequence of operations.
Proceedings ArticleDOI
A QoS broker based architecture for efficient Web services selection
TL;DR: This paper presents a QoS broker-based architecture for Web services to support the client in selecting Web services based on his/her required QoS, and proposes a two-phase verification technique that is performed by a third party broker.
Proceedings ArticleDOI
Verity: a QoS metric for selecting Web services and providers
TL;DR: It is argued that verity should be taken into account for a quality driven selection and composition of Web services, and introduced a new QoS attribute termed verity and proposed architecture to quantify it.
Journal ArticleDOI
MOSES: A Framework for QoS Driven Runtime Adaptation of Service-Oriented Systems
Valeria Cardellini,Emiliano Casalicchio,Vincenzo Grassi,Stefano Iannucci,Francesco Lo Presti,Raffaela Mirandola +5 more
TL;DR: This paper presents MOSES, a methodology and a software tool implementing it to support QoS-driven adaptation of a service-oriented system and shows the effectiveness of the proposed approach.
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.