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
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Book ChapterDOI
Predicting Performance Properties for Open Systems with KAMI
TL;DR: Following a model-driven approach, how to use at design time performance models based on Queuing Networks to drive architectural reasoning is discussed and the possible use of keeping models alive at run time is discussed.
Journal ArticleDOI
Grey Relational Analysis on Factors of the Quality of Web Service
TL;DR: Using the grey relational analysis theory, the principal factors of Quality of Service of Web Sevice and its contributions are found and the sequence of influencing factors of Web Service selection is Best Practices, Compliance, Availability, Successability, Reliability, Latency, Response Time, Throughput, Documentation.
Proceedings ArticleDOI
A graph-based Particle Swarm Optimisation approach to QoS-aware web service composition and selection
TL;DR: A graph-based PSO technique is presented which simultaneously determines an optimal workflow and near-optimal Web services to be included in the composition based on their QoS properties, as well as a greedy-basedPSO technique which follows the commonly utilised approach.
Proceedings ArticleDOI
Collaborative Web Services Monitoring with Active Service Broker
TL;DR: A collaborative runtime monitoring framework to enhance the dependability of the software developed in traditional Web services architecture and the model-based approach is discussed for automatic sensor generation and runtime enforcement based on service's process model and verification model.
Journal ArticleDOI
Towards Efficient Authenticated Subgraph Query Service in Outsourced Graph Databases
TL;DR: The proposed Merkle IFTree (MIFTree) aims to minimize I/O in a well-received subgraph query paradigm called the filtering-and-verification framework and proposes an enhanced authentication method on MIFTree that is clearly more efficient than a baseline method.
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.