网构化软件服务的动态替换技术研究

发布时间：2018-03-04 03:24

本文选题：网构化软件　切入点：Web服务　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,随着Internet的快速发展,传统的构件开发方法已不能应对在开放、动态、难控网络环境下实现资源共享和集成的挑战。面向服务的计算与架构通过Web服务将网络环境下的构件与构件组装的思想提升到了独立服务与服务组合的层面,是基于构件的开发方法在Internet环境下的进一步发展。随着网络上用户需求复杂性的增加,单独的Web服务越来越不能满足用户的需求。网构化软件将网络上的服务进行整合,通过运行整合后的服务可以满足用户的复杂需求,因而获得了快速发展。但是,网构化软件运行机制复杂,要求整个网构化软件能够持续运行,服务的动态替换技术在网构化软件运行过程中出现失效服务时能够快速寻找替换服务并顺利完成服务替换工作,是保证网构化软件持续运行的必要前提。论文分析了网构化软件服务替换的相关理论与技术,在分析基础上,提出了一种基于语义的服务分类算法。算法定向提取目标服务WSDL文档语义信息,通过BabelNet同义词词典对提取的信息进行语义扩展,得到服务集中服务的同义词集合,将同义词集合向量化,对服务语义向量进行聚类操作,得到相似功能服务簇。在使用基于语义服务分类算法对服务进行分类的基础之上,通过对服务参数个数异构、参数顺序异构、参数名称异构的处理,建立功能服务社区,得出社区中的服务参数映射表,缩小了服务发现目标服务集。同时,服务社区也为服务替换过程中服务参数异构问题提供了一种解决方法。论文还提出了一种基于语义分类算法及服务社区的三层体系结构动态替换模型。模型实现了服务的动态发现、排序、选择,模型通过与QOS证据数据库结合使用,为服务选取提供了客观的质量评价标准,实现了动态服务替换。通过实验仿真与数据分析,模型提高了服务正确替换率,缩短了相同功能服务再次替换所用时间。
[Abstract]:In recent years, with the rapid development of Internet, traditional component development methods can no longer cope with the open, dynamic, The challenges of resource sharing and integration in hard-to-control network environment. Service-oriented computing and architecture elevate the idea of component and component assembly in network environment to the level of independent service and service composition through Web services. It is the further development of component-based development method in Internet environment. With the increasing complexity of users' requirements on the network, individual Web services can not meet the needs of users more and more. The integrated service can meet the complex needs of the users, so it has developed rapidly. However, the running mechanism of the network-structured software is complex, which requires the whole network-structured software to run continuously. The technology of dynamic service replacement can find the replacement service quickly and finish the service replacement work smoothly when the service failure occurs in the running process of the network structuring software, which is the necessary prerequisite to ensure the continuous operation of the network structure software. Based on the analysis of the theory and technology of web structured software service replacement, a service classification algorithm based on semantics is proposed. The algorithm extracts the semantic information of target service WSDL document. The BabelNet synonym dictionary is used to extend the extracted information to obtain the synonym set of the service centralization service. The synonym set is vectorized and the service semantic vector is clustered. On the basis of classifying services based on semantic services, the service community is established by processing the number of service parameters, the order of parameters and the isomerism of parameter names. The mapping table of service parameters in the community is obtained, which reduces the target service set of service discovery, and also provides a solution to the problem of heterogeneous service parameters in the process of service replacement. This paper also proposes a dynamic replacement model of three-tier architecture based on semantic classification algorithm and service community. The model realizes the dynamic discovery, ranking, selection of services, and the model is used in combination with QOS evidence database. It provides an objective quality evaluation standard for service selection and realizes dynamic service replacement. Through experimental simulation and data analysis, the model improves the correct replacement rate of service and shortens the time used to replace the same service again.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.09

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