支持服务关联的Web服务选择技术研究

发布时间：2018-06-08 13:18

本文选题：Web服务 + 服务选择　；参考：《宁波大学》2014年硕士论文

【摘要】：随着面向服务计算技术的发展，互联网上出现了大量功能属性相同或类似的服务，用户在构建组合服务时，必须面对海量的可供选择的服务。如何快速从候选服务中选择满足用户需求的服务，是Web服务组合的关键。现有的Web服务选择方法一般以“候选服务之间相互独立，不存在关联关系”和“服务一次选择成功“作为假设。但在实际的服务选择过程中，服务之间存在一些诸如业务关联、质量关联等联系，这些关系影响了组合Web服务的质量。本文主要针对服务之间的关联关系进行研究，探究关联关系对组合Web服务的影响。在服务计算环境中，有些Web服务最初不能满足用户的QoS需求，但通过协商可以达到用户的需求。本文研究了具体的服务协商方法，提出了解决服务使用者与服务提供商之间冲突或分歧的方法，从而实现参与双方利益的公平化和最大化。在服务关联关系的处理上，本文在分析包括统计关联、业务关联和接口关联的三种业务关联关系的基础上，提出了一种新颖的Web服务描述模型。此模型支持服务之间的关联关系，并基于这个服务描述模型，，本文给出了服务相似度的计算方法和发现关联服务集合的方法。在支持服务关联的组合服务QoS模型的基础上，本文将支持服务关联的Web服务选择问题转化成混合整数规划数学模型进行求解。在实际的应用环境中，服务使用者和服务提供者之间会存在一对多和多对多两种情形。目前多数服务协商研究是针对一对多的模型，即一个服务使用者和多个服务提供商，没有考虑存在多个服务使用者的情形。本文考虑存在多个协商主体的情形，基于Agent的技术，利用Skyline方法剔除冗余服务提供商。根据参与协商主体的数量，计算协商环境的利弊，然后通过综合分析服务协商环境和参与双方的协商态度，采用签订SLA协议，完成服务协商过程。
[Abstract]:With the development of service-oriented computing technology, a large number of services with the same or similar functional attributes appear on the Internet. When building composite services, users must face a large number of alternative services. It is the key of Web service composition that how to quickly select the service from candidate service to satisfy the user's demand. The existing methods of Web service selection generally depend on the independence of candidate service. There is no association "and" service one-time selection success "as a hypothesis. However, in the process of service selection, there are some relationships between services, such as business association and quality correlation, which affect the quality of composite Web services. In this paper, the relationship between services is studied to explore the impact of the relationship on the composition of Web services. In the service computing environment, some Web services can not meet the QoS requirements of users at first, but they can be reached by negotiation. In this paper, the specific service negotiation methods are studied, and the methods to resolve the conflicts or differences between service consumers and service providers are proposed, so as to realize the fairness and maximization of the interests of both parties. Based on the analysis of three kinds of business relationships including statistical association, business association and interface association, a novel Web service description model is proposed in this paper. This model supports the relationship between services. Based on the service description model, this paper presents a method to calculate the similarity of services and to find the set of associated services. Based on the QoS model of composite services supporting service association, this paper transforms the problem of Web service selection supporting service association into a mixed integer programming mathematical model to solve it. There will be one-to-many and many-to-many situations between the service consumer and the service provider. At present, most service negotiation studies focus on the one-to-many model, that is, one service consumer and more than one service provider, without considering the existence of more than one service consumer. In this paper, we consider the existence of multiple negotiation agents and eliminate redundant service providers by using the Skyline method based on Agent technology. According to the number of participants, the advantages and disadvantages of the negotiation environment are calculated, and then the service negotiation process is completed by synthetically analyzing the service negotiation environment and the negotiation attitude of both parties.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.09

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