Abstract: In the current, registration and discovery interface for Web services are only based on the functional description. They cannot implement Web services registration and discovery with QoS properties. Thus, this paper proposes a PFS model for Web services supporting QoS properties. A QoS Broker module is introduced to implement Web services registration, discovery, selection and QoS information management. QoS Broker can act as a trustworthy third party that implements QoS monitoring and evaluation during the process of Web services, and updates the service QoS information by means of the latest evaluation results. Therefore, the impartiality, trustworthiness, and real-time characters of QoS information are ensured. Some pivotal techniques related implementing the model is also introduced.

Key words: Web services, Quality of services(QoS), Model, QoS broker

摘要： 目前的Web服务只有基于功能性描述的服务注册与发现接口，不能实现具有QoS属性的Web服务注册与发现，为此提出了支持QoS属性的Web服务PFS模型，引入QoS Broker模块实现具有QoS属性的Web服务注册、查找、选择和QoS信息的管理功能，实现了Web服务使用过程中的QoS监视以及QoS评价，并将最新的评价结果用于服务QoS信息的更新，从而保证了QoS信息的公平性、可信性和实时性。

关键词: Web服务, QoS, 模型, QoS Broker

CLC Number: 

• TP393.02