摘要： 基于接口的服务组合思想并融合P2P技术，提出一种可组合广域范围Web服务的组合模型。根据领域本体及其推理能力，按Web服务的功能关系组织不同的生成树，依据生成树间的组合关系构造Web服务组合网，并给出一种高效的服务组合算法。大量模拟实验表明了该模型的优越性，即支持基于服务质量的Web服务组合，服务组合成功率高，Web服务发布、查找与组合时间快。

关键词: 生成树, 服务覆盖网络, Web服务, 服务组合, 对等

Abstract: This paper presents a composition model capable of composing Web services across wide area networks with the service composition based on interface idea integrated with Peer to Peer(P2P) technologies. It forms a novel Web Services Composition Overlay Network(WSCON) with P2P technologies, then associates nodes in the same Web services composition domain to form the Web Services Composition Network(WSCN), according to domain ontology and its reasoning ability. Web service discovery and composition entry are performed through Distributed Hash Table(DHT). Extensive experiments are conducted by using large-scale simulations. The experimental results show the advantages of the model: supporting Web service composition based on QoS, high composition success rate, fast service distribution, discovery and composition, and tolerant to dynamic service component node arrivals and departures.

Key words: spanning tree, services overlay network, Web services, composition of services, Peer-to-Peer(P2P)

中图分类号: 

• TP393