Journal ArticleDOI
QoS issues in Web services
Reads0
Chats0
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
More filters
Proceedings ArticleDOI
A client perceived QoS model for web services selection
TL;DR: This paper presents a QoS model using the uncertain attributes: response time, availability and reliability, and uses a Non-parametric Test technique which tests historical QoS information that measured from client side.
Proceedings ArticleDOI
A cloud service discovery approach based on FCA
Jianhong Xu,Weizhi Gong,Ye Wang +2 more
TL;DR: A new service discovery approach based on FCA is presented to filter irrelevant services by availability parameter and semantic distance similarity, then handle the nonfunctional QoS attributes with FCA, classify services by their QoS levels and select suitable service for user.
Proceedings ArticleDOI
Web Services Selection in Support of Reliable Web Service Choreography
TL;DR: The proposed approach is evaluated by simulation, and the experimental results show that the proposed method is close to centralized method and better than the other two distributed Web services selection methods.
Journal ArticleDOI
IQoS-aware exception resolution for BPEL processes: a middleware-based framework and performance evaluation
TL;DR: A middleware-based framework for system exception resolution is proposed, which undertakes the tasks of failure interception, discovery of alternative services and their invocation, and arranges for bridging syntactic differences between the originally invoked services and functionally equivalent replacements to it, by employing XSLT-based transformations.
Hybrid Web Services Ranking Algorithm
TL;DR: This paper proposes a new ranking method which is a hybrid of matrix ranking method and QoS based fuzzy ranking method, and reviews the existing works done and summarizes the benefits and conclusions of the presented ideas.
References
More filters
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.