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Lifetime Service Level Agreement Management With Autonomous Agents For Services Provision, Qiang He, Jun Yan, Ryszard Kowalczyk, Hai Jin, Yun Yang
Lifetime Service Level Agreement Management With Autonomous Agents For Services Provision, Qiang He, Jun Yan, Ryszard Kowalczyk, Hai Jin, Yun Yang
Dr Jun Yan
In the web services environment, service level agreements (SLA) refers to mutually agreed understandings and expectations between service consumers and providers on the service provision. Although management of SLA is critical to wide adoption of web services technologies in the real world, support for it is very limited nowadays, especially in web service composition scenarios. There lacks adequate frameworks and technologies supporting various SLA operations such as SLA formation, enforcement, and recovery. This paper presents a novel agent-based framework which utilises the agents' ability of negotiation, interaction, and cooperation to facilitate autonomous SLA management in the context of service composition …
Swindew-S: Extending P2p Workflow Systems For Adaptive Composite Web Services, Jun Shen, Jun Yan, Yun Yang
Swindew-S: Extending P2p Workflow Systems For Adaptive Composite Web Services, Jun Shen, Jun Yan, Yun Yang
Dr Jun Yan
SwinDeW, an innovative decentralised workflow management system, has established an underlying framework for peer-to-peer (p2p) based business process coordination environments. SwinDeW-S extends SwinDeW to support adaptive composite service orchestration in the era of service-oriented computing. This paper comprehensively presents features of SwinDeW-S, including the p2p network establishment, the messaging mechanism, the service deployment and enactment, the service discovery and advertisement, and the service flow execution. The prototypical extension of SwinDeW to SwinDeW-S and the advantages of SwinDeW-S are also examined and analysed. With the innovative integration of service and p2p-based enterprise application techniques, SwinDeW-S can support composite service orchestration, deployment …
Adaptation Of Web Service Composition Based On Workflow Patterns, Qiang He, Jun Yan, Hai Jin, Yun Yang
Adaptation Of Web Service Composition Based On Workflow Patterns, Qiang He, Jun Yan, Hai Jin, Yun Yang
Dr Jun Yan
Business processes consisting of component Web services are often executed in volatile environments where the quality of service parameters of the participating services might change during the execution of the business processes. Recently, research has been carried out on adapting composite Web service in volatile service-oriented computing environments. However, current approaches do not consider the internal logic of the business process and the impact of adaptation for a single service on the other component services. Other than quality of service parameters, effective adaptation requires specific information of the component services in terms of their position and interaction in the business …
Chord4s: A P2p-Based Decentralised Service Discovery Approach, Qiang He, Jun Yan, Yun Yang, Ryszard Kowalczyk, Hai Jin
Chord4s: A P2p-Based Decentralised Service Discovery Approach, Qiang He, Jun Yan, Yun Yang, Ryszard Kowalczyk, Hai Jin
Dr Jun Yan
Service-oriented computing is emerging as a paradigm for developing distributed applications. A critical issue of utilising service-oriented computing is to have a scalable, reliable and robust service discovery mechanism. However, traditional service discovery methods using centralised registries can easily suffer from problems such as performance bottleneck and vulnerability to failures in the large scalable service network, thus functioning abnormally. To address these problems, this paper proposes a peer-to-peer based decentralised service discovery approach named Chord4S. Chord4S utilises the data distribution and lookup capabilities of the popular Chord to distribute and discover services in a decentralised manner. Data availability is further …