【摘要】：功能單一、結(jié)構(gòu)簡單的Web服務(wù)無法滿足日漸復雜的業(yè)務(wù)需求,因此對Web服務(wù)組合研究的必要性日漸凸顯。然而在服務(wù)組合的過程中,又面臨著運行時環(huán)境的變化以及用戶需求信息的變化而引發(fā)的諸多問題。為了使Web服務(wù)組合能夠適應(yīng)外部環(huán)境及用戶需求的動態(tài)變化,自適應(yīng)機制被引入到Web服務(wù)組合中。根據(jù)制定的自適應(yīng)策略,通過感知外部環(huán)境及用戶需求的變化,自適應(yīng)的服務(wù)組合系統(tǒng)能夠自主地調(diào)整自身行為以應(yīng)對感知到的外部環(huán)境及用戶需求的變化。同時,隨著服務(wù)組合規(guī)模的擴大以及系統(tǒng)需求的日益復雜和不斷增長,系統(tǒng)開發(fā)迎來了新的挑戰(zhàn),因此,需求工程概念也被引入到服務(wù)組合研究領(lǐng)域。將需求建模技術(shù)與自適應(yīng)Web服務(wù)組合技術(shù)相結(jié)合,研究需求驅(qū)動的自適應(yīng)Web服務(wù)組合具有重要的現(xiàn)實意義。 針對當前Web服務(wù)組合的研究現(xiàn)狀,在研究學習相關(guān)理論知識的基礎(chǔ)上,結(jié)合需求建模技術(shù),給出了一個需求驅(qū)動的自適應(yīng)Web服務(wù)組合框架,并對其執(zhí)行原理和流程進行了相應(yīng)介紹。首先構(gòu)建用戶的需求模型,采用I*框架及其擴充語義相結(jié)合的方式對用戶的功能需求和非功能需求進行建模；然后將建立的需求模型轉(zhuǎn)換為抽象Web服務(wù)組合模型,并將抽象Web服務(wù)組合模型映射為用CCML語言描述的具體Web服務(wù)組合模型。設(shè)計并實現(xiàn)了框架的主要功能模塊,主要包括執(zhí)行引擎、發(fā)現(xiàn)引擎、監(jiān)控器和規(guī)劃器等,并對框架中的自適應(yīng)機制進行了詳細描述。最后給出了一個外出旅游的Web服務(wù)組合實例,通過模擬該實例的執(zhí)行過程驗證了本文給出的需求驅(qū)動的自適應(yīng)Web服務(wù)組合框架的可行性和有效性。
[Abstract]:The single function and simple structure of Web services can not meet the increasingly complex business requirements, so the necessity of research on Web services composition becomes more and more important. However, in the process of service composition, there are many problems caused by the change of runtime environment and the change of user demand information. In order to adapt Web service composition to the dynamic changes of external environment and user needs, adaptive mechanism is introduced into Web service composition. According to the developed adaptive strategy, the adaptive service composition system can adjust its own behavior to cope with the change of perceived external environment and user needs by sensing the changes of external environment and user needs. At the same time, with the expansion of service composition scale and the increasing complexity and growth of system requirements, system development is facing new challenges. Therefore, the concept of requirement engineering has been introduced into the field of service composition research. It is of great practical significance to combine the requirement modeling technology with the adaptive Web service composition technology to study the requirement driven adaptive Web service composition. According to the current research situation of Web services composition, based on the study of relevant theoretical knowledge and requirements modeling technology, this paper presents a demand-driven adaptive Web service composition framework. The principle and flow of its execution are also introduced. Firstly, the user's requirement model is constructed, and the functional and non-functional requirements of the user are modeled by the combination of the I * framework and the extended semantics. Then the requirements model is transformed into an abstract Web service composition model, and the abstract Web service composition model is mapped to a concrete Web service composition model described in CCML language. The main function modules of the framework are designed and implemented, including execution engine, discovery engine, monitor and planner, etc. The adaptive mechanism in the framework is described in detail. Finally, an example of traveling Web service composition is given, and the feasibility and effectiveness of the proposed framework are verified by simulating the execution process of the example.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP393.09

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