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Differentiated service

About: Differentiated service is a research topic. Over the lifetime, 5539 publications have been published within this topic receiving 105225 citations.


Papers
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Journal ArticleDOI
TL;DR: The authors introduce a novel QoS measure approach to efficiently measure QoS of web service for web service selection that takes the three factors, that is, service providers, the context of customers and historical statistics intoQoS measure.
Abstract: Quality of service (QoS) is critical for service customers to select suitable web services for business applications in open web environment. However, since QoS are often influenced by several factors, traditional approaches are not very efficient and effective in measuring QoS of web service. The authors introduce in this study a novel QoS measure approach to efficiently measure QoS of web service for web service selection. The core of this approach is to take the three factors, that is, service providers, the context of customers and historical statistics into QoS measure. The experimental results demonstrate that the proposed approach is efficient and effective in measuring QoS of web service.

25 citations

Journal Article
TL;DR: The aim of this paper is to contribute to the long-term objective of lifting service aggregation from manual hand-crafting to a semi-automated engineered process.
Abstract: Service aggregation is one of the main issues in the emerging area of service-oriented computing. The aim of this paper is to contribute to the long-term objective of lifting service aggregation from manual hand-crafting to a semi-automated engineered process. We present a methodology which, given a set of service contracts, tries to construct an aggregation of such services. Service contracts include a description of the service behaviour (expressed by a YAWL workflow), as weli as an (ontology-annotated) signature. The core aggregation process basically performs a control-flow and an (ontology-aware) data-flow analysis of a set of YAWL workflows to build the contract of an aggregated service.

25 citations

Proceedings ArticleDOI
22 Aug 2005
TL;DR: This paper presents an ongoing project to devise a novel service composition framework, named AdaptiveBPEL that leverages aspect-oriented software development (AOSD) techniques to open up the service composition for dynamic change in order to provide a greater degree of configurability and dynamic adaptability of Web services.
Abstract: The variation of contexts in which a Web service could be used and the resulting variation in functional and quality of service (QoS) requirements motivates further research to extend Web services platforms to cater for differentiated service offerings and dynamic adaptability. Adaptability is an important requirement in the context of Web services to cater for the need of diverse set of client applications requesting customized view of consumed Web services to fit their own contexts and preferences. This paper presents an ongoing project to devise a novel service composition framework, named AdaptiveBPEL that leverages aspect-oriented software development (AOSD) techniques to open up the service composition for dynamic change in order to provide a greater degree of configurability and dynamic adaptability of Web services. This framework can: 1) easily adapt to changes in business rules, and collaboration policies governing service interactions; 2) provide different levels of functional and QoS offerings. The adaptation process is policy-driven to declaratively define the adaptive service behavior through dynamic injection of functional and non-functional extensions into a core service composition to allow on-demand and per-instance service adaptability.

25 citations

Proceedings ArticleDOI
05 Dec 2005
TL;DR: The performance evaluation shows that during overloads the most important transactions are guaranteed to meet their deadlines and that reliable quality of service is provided even in the face of varying load and execution time estimation errors.
Abstract: The intricacy of real-time data service management increases mainly due to the emergence of applications operating in open and unpredictable environments, increases in software complexity, and need for performance guarantees. In this paper we propose an approach for managing the quality of service of real-time databases that provide imprecise and differentiated services, and that operate in unpredictable environments. Transactions are classified into service classes according to their level of importance. Transactions within each service class are further classified into subclasses based on their quality of service requirements. In this way transactions are explicitly differentiated according to their importance and quality of service requests. The performance evaluation shows that during overloads the most important transactions are guaranteed to meet their deadlines and that reliable quality of service is provided even in the face of varying load and execution time estimation errors

25 citations

Journal ArticleDOI
TL;DR: A multi-level service composition model that perceives service specification as going through several levels of abstraction starts from transactional operations at the lowest level and abstracts into activities at higher levels that are close to the service provider or end user is presented.
Abstract: Web services have become popular as a vehicle for the design, integration, composition, reuse, and deployment of distributed and heterogeneous software. However, although industry standards for the description, composition, and orchestration of Web services have been under development, their conceptual underpinnings are not fully understood. Conceptual models for service specification are rare, as are investigations based on them. This paper presents and studies a multi-level service composition model that perceives service specification as going through several levels of abstraction. It starts from transactional operations at the lowest level and abstracts into activities at higher levels that are close to the service provider or end user. The authors treat service composition from a specification and execution point of view, where the former is about composition logic and the latter about transactional guarantees. Consequently, the model allows for the specification of a number of transactional properties, such as atomicity and guaranteed termination, at all levels. Different ways of achieving the composition properties and implications of the model are presented. The authors also discuss how the model subsumes practical proposals like the OASIS Business Transaction Protocol, Sun's WS-TXM, and execution aspects of the BPEL4WS standard.

25 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20224
202118
202023
201939
201836
201789