本文選題：Petri網　切入點：服務組合　出處：《濟南大學》2016年碩士論文

【摘要】：隨著互聯網技術和電子商務的迅猛發(fā)展,Web服務作為信息服務資源的具體實現之一得到了更為廣泛的使用。Web服務因其跨平臺、松耦合的特點,支持在不同語言,不同平臺上進行有效的Web服務組合,以分布式計算的模式為人們提供更為方便和豐富的服務。如何將已有的Web服務進行有效組合一直是服務計算領域的熱點問題,其中包括服務選擇,服務組合建模,服務組合動態(tài)執(zhí)行分析等問題。Petri網因其具有嚴格的數學定義和適合描述并發(fā)系統(tǒng)的特點,近年來在Web服務組合相關的問題研究中得到廣泛應用,尤其在服務組合模型的構建,服務組合中服務的行為分析等方面。本文面向Web服務組合,基于服務組合的Petri網描述,從對具體服務組合執(zhí)行過程日志的分析,研究對已有服務組合模型進行優(yōu)化的方法;同時基于運行日志分析,研究實際運行中服務間存在的關聯關系,為服務選擇提供有效的選擇依據,提高服務組合的效率。本文首先從日志文件的獲取和分析方法入手,設計并實現了基于Petri網的服務組合執(zhí)行引擎原型系統(tǒng)平臺,在此平臺之上可以實現Web服務的注冊,Web服務的組合,服務組合模型(mx Graph)與相應Petri網模型間的轉換,服務組合的執(zhí)行。該平臺基于服務領域功能體系的OWL(Ontology Working Group)文檔,解析Web服務的WSDL(Web Services Description Language)文件,將Web服務注冊到本地,根據平臺中展示的領域服務進行服務的組合,并將其中各類服務綁定對應的具體服務,將服務組合實例提交執(zhí)行引擎執(zhí)行,最后返回執(zhí)行結果,同時得到相應服務組合執(zhí)行的運行日志。其次,以服務組合執(zhí)行日志為基礎,挖掘運行日志所反映出具有強關聯的抽象服務和強關聯的具體服務,并且設計相應的關聯服務庫,把這些關聯的服務存儲到關聯服務庫中,按照關聯強度大小,把抽象的關聯服務推薦給用戶,作為指導用戶的選擇,在進行抽象服務實例化時也是按照關聯強度從大到小的原則進行具體服務的選擇,并通過具體實驗來驗證由日志中獲取的服務間關聯的有效性及可靠性,優(yōu)化了服務選擇。最后,從服務組合模型的角度對服務組合進行優(yōu)化。服務組合完成之后,基于運行日志,通過對Web服務組合中各服務執(zhí)行時間的評價,對服務組合的Petri網模型進行優(yōu)化,以實現對服務組合模型優(yōu)化,提高服務組合的執(zhí)行效率,有效降低服務器端系統(tǒng)資源消耗。
[Abstract]:With the rapid development of Internet technology and electronic commerce, Web services, as one of the concrete realization of information service resources, have been more widely used. Web services are supported in different languages because of their cross-platform and loosely coupled characteristics.Effective Web service composition based on different platforms provides people with more convenient and abundant services with distributed computing mode.How to effectively compose existing Web services has always been a hot issue in the field of service computing, including service selection, service composition modeling.Service composition dynamic execution Analysis. Because of its strict mathematical definition and suitable for describing concurrent system, Petri net has been widely used in the research of Web service composition related problems in recent years, especially in the construction of service composition model.Analysis of service behavior in service composition.This paper aims at Web service composition, based on Petri net description of service composition, from the analysis of the execution process log of specific service composition, studies the method of optimizing the existing service composition model, at the same time, based on the analysis of running log,In order to provide an effective basis for service selection and improve the efficiency of service composition, this paper studies the relationship between services in actual operation.This paper starts with the method of obtaining and analyzing log files, designs and implements the prototype system platform of service composition execution engine based on Petri net, and can realize the composition of Web service registration based on this platform.The transformation between the service composition model and the corresponding Petri net model, and the execution of the service composition.The platform is based on the OWL(Ontology Working Group document of the service domain function system, parses the WSDL(Web Services Description language file of the Web service, registers the Web service locally, and performs the composition of the service according to the domain service shown in the platform.The service composition instance is submitted to the execution engine for execution, and the execution result is returned. At the same time, the running log of the corresponding service composition execution is obtained.Secondly, based on the service composition execution log, mining the abstract service with strong association and the concrete service with strong association reflected in the running log, and designing the corresponding associated service library to store these associated services in the association service library.According to the intensity of association, the abstract association service is recommended to the user as the choice of guiding user, and the specific service is chosen according to the principle of association strength from large to small when instantiating the abstract service.The validity and reliability of the correlation between the services obtained from the log are verified by experiments, and the service selection is optimized.Finally, the service composition is optimized from the point of view of service composition model.After the service composition is completed, based on the running log, the service composition Petri net model is optimized by evaluating the execution time of each service in the Web service composition, in order to optimize the service composition model and improve the execution efficiency of the service composition.Reduce server system resource consumption effectively.
【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TP393.09;TP301.1

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