基于并发协商的Web服务发现模型研究

发布时间：2018-04-21 18:18

本文选题：Web服务 + UDDI　；参考：《重庆大学》2014年硕士论文

【摘要】：随着Web服务研究的不断深入和大量稳定易用的Web服务的广泛应用，如何从众多的服务中高效地发现满足需求的Web服务是一个需要解决的问题。传统的基于UDDI和WSDL标准的Web服务发现方法是基于简单分类与关键字查询，具有不能准确描述查询的目标、缺乏对候选服务和查询目标间的符合程度的度量、缺乏对多种语义操作查询的支持等缺点，影响了Web服务的查准率和查全率，并没有明确地定义Web服务QoS(Quality of Service)信息表示方法，仅能找到满足功能的Web服务，不能发现最适合服务请求者的服务。近年来，服务请求者加大了对Web服务非功能特性的关注。为了能够让用户发现最适合自己的Web服务，本文在传统的框架上加入了对QoS非功能特性的考虑，，然后利用并发协商机制对QoS参数进行协商，最后利用效用函数从协商成功的Web服务中选择最合适的服务，提出了一种基于并发协商的Web服务发现模型。具体工作如下： ①首先对面向服务的计算机体系结构、Web服务的各种特性以及Web服务发现的传统框架进行研究，分析了传统Web服务发现框架的一些缺陷与不足，分析了服务质量的重要性以及对Web服务发现的影响。 ②对Agent技术与多Agent系统进行了研究；并对自动协商、协商议题、协商协议、一对多协商等进行了研究；对比研究了协商中用到的各种协调策略和协商策略。 ③研究了以往各种Web服务发现方法，分析并发协商的特性以及基于QoS的Web服务，设计了一种基于并发协商的Web服务发现模型；并给出了本模型的发现框架、并发协商框架；设计了模型算法步骤；最后采用均匀线性策略、易妥协协商策略、基于对手历史协商策略与无协商算法进行对比实验，得出协商后的效用值明显好于无协商的效用值，并发协商Web服务发现框架会得到更优的服务，验证了模型的有效性与正确性。
[Abstract]:With the deepening of the research on Web services and the wide application of a large number of stable and easy-to-use Web services, it is a problem to solve how to efficiently find the Web services that meet the requirements from many services. The traditional Web service discovery method based on UDDI and WSDL standards is based on simple classification and keyword query. The lack of support for multiple semantic operation queries affects the recall and recall of Web services, and does not clearly define the QoS(Quality of Service information representation method for Web services, and can only find Web services that satisfy their functions. Services that are best suited to service requesters cannot be found. In recent years, service requesters have increased their attention to the non-functional features of Web services. In order to enable users to find the most suitable Web services for themselves, this paper adds consideration to the non-functional features of QoS in the traditional framework, and then uses concurrent negotiation mechanism to negotiate QoS parameters. Finally, a Web service discovery model based on concurrent negotiation is proposed by using utility function to select the most suitable service from the negotiated Web service. The specific work is as follows: Firstly, the characteristics of the service-oriented computer architecture and the traditional framework of Web service discovery are studied, and some defects and shortcomings of the traditional Web service discovery framework are analyzed. The importance of QoS and its influence on Web service discovery are analyzed. (2) the Agent technology and multi- system are studied, and the automatic negotiation, negotiation topic, negotiation protocol and one-to-many negotiation are studied, and various coordination strategies and negotiation strategies used in negotiation are compared. 3. This paper studies various Web service discovery methods in the past, analyzes the characteristics of concurrent negotiation and Web services based on QoS, designs a Web service discovery model based on concurrent negotiation, and presents the discovery framework and concurrency negotiation framework of this model. The model algorithm steps are designed. Finally, uniform linear strategy and compromise negotiation strategy are adopted. The results show that the utility value after negotiation is obviously better than that without negotiation, based on the comparison experiment between historical negotiation strategy and non-negotiation algorithm. The concurrency negotiation Web services discovery framework will get better service, which verifies the validity and correctness of the model.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.09

【参考文献】