發(fā)布時(shí)間：2018-07-23 15:51

【摘要】：隨著Web服務(wù)技術(shù)的不斷應(yīng)用與發(fā)展,特別是面向服務(wù)的體系結(jié)構(gòu)(SOA)的成熟和推廣,使得面向服務(wù)的計(jì)算逐步成為一門新興的計(jì)算學(xué)科,并得到了學(xué)術(shù)界和工業(yè)界的廣泛支持。與此同時(shí),衛(wèi)星信息資源服務(wù)也趨于多樣化和顆粒化,要求各個(gè)功能服務(wù)單元不僅具備單項(xiàng)服務(wù)能力,各功能服務(wù)之間還要能夠動(dòng)態(tài)組合在一起,以提升整體服務(wù)的能力,衛(wèi)星信息資源的動(dòng)態(tài)服務(wù)組合方法成為新的難題。Web服務(wù)組合技術(shù)提供了一種高度互操作、跨平臺(tái)和松耦合的框架體系,針對(duì)衛(wèi)星信息資源服務(wù)體系的難題提出解決方法。通過小粒度的Web服務(wù)之間的通信和協(xié)作來實(shí)現(xiàn)大顆粒度服務(wù),通過組合多個(gè)Web服務(wù),實(shí)現(xiàn)服務(wù)增值和服務(wù)重用,將Web服務(wù)的潛能得以最大限度發(fā)揮。本文的工作主要包含以下方面： 1.提出了一種在語義層面上描述Web服務(wù)語言的模型。本文選取OWL-S為基礎(chǔ)來描述Web服務(wù),增加了服務(wù)的描述信息,在傳統(tǒng)的IOPE的四種屬性上,本文增加了語義描述服務(wù)目的和非功能屬性,前者可以在服務(wù)匹配時(shí)提高匹配的效率,后者可以在服務(wù)匹配和服務(wù)組合時(shí)及時(shí)發(fā)現(xiàn)剔除不符合用戶需求的服務(wù)和服務(wù)鏈。 2.提出一種基于因果關(guān)系矩陣和圖論的動(dòng)態(tài)服務(wù)組合方法。首先通過服務(wù)輸入輸出的參數(shù)構(gòu)建相應(yīng)的關(guān)系矩陣,存儲(chǔ)不同服務(wù)之間輸入輸出的關(guān)系以及語義之間的聯(lián)系,每個(gè)元素是一個(gè)分別包含當(dāng)前服務(wù)、匹配程度和非功能屬性值的三元組,以便在構(gòu)建服務(wù)組合鏈時(shí)能夠快速準(zhǔn)確的找到上下關(guān)聯(lián)服務(wù)。其次根據(jù)圖論的方法,用回溯的方法尋找上一級(jí)滿足要求的服務(wù),在這個(gè)過程中一旦非功能屬性值不滿足用戶要求就會(huì)舍棄該組合鏈,尋找另一條組合鏈。最后,在滿足用戶需求的服務(wù)鏈集合中選擇最優(yōu)的服務(wù)鏈。 3.搭建服務(wù)組合框架并進(jìn)行測試以驗(yàn)證可行性。本文準(zhǔn)備了大量服務(wù)數(shù)據(jù),針對(duì)上面提到的基于因果關(guān)系矩陣和圖論的服務(wù)組合方法,設(shè)計(jì)了測試方案,制定了相應(yīng)的評(píng)判標(biāo)準(zhǔn)。通過實(shí)驗(yàn)結(jié)果證明在本文提出的框架下,能夠高效和準(zhǔn)確的實(shí)現(xiàn)服務(wù)的動(dòng)態(tài)組合。
[Abstract]:With the continuous application and development of Web services technology, especially the maturity and popularization of service-oriented architecture (SOA), service-oriented computing has gradually become a new computing discipline, and has been widely supported by academia and industry. At the same time, satellite information resources services are becoming more diversified and granular, requiring each functional service unit not only to have a single service capability, but also to be able to dynamically combine the various functional services together, in order to enhance the overall service capability. The dynamic service composition method of satellite information resources has become a new problem. Web service composition technology provides a highly interoperable, cross-platform and loosely coupled framework system, and proposes a solution to the difficult problem of satellite information resources service system. Large granularity services are realized through communication and cooperation between small grained Web services. By composing multiple Web services, service increment and service reuse can be realized to maximize the potential of Web services. The work of this paper mainly includes the following aspects: 1. This paper presents a semantic model for describing Web services languages. In this paper, we choose OWL-S as the basis to describe the Web service, and add the description information of the service. On the four attributes of traditional IOPE, we add semantic description of service purpose and non-functional attribute, the former can improve the efficiency of service matching. The latter can find and eliminate services and service chains that do not meet the needs of users in time when service matching and service composition. 2. A dynamic service composition method based on causality matrix and graph theory is proposed. First of all, the corresponding relational matrix is constructed by the parameters of the service input and output, and the relationship between the input and output of different services and the relationship between the semantics are stored. Each element contains the current service separately. The triples of the matching degree and the nonfunctional attribute value can be found quickly and accurately when constructing the service composition chain. Secondly, according to the method of graph theory, the method of backtracking is used to find the service that meets the requirements of the upper level. In this process, once the non-functional attribute value does not satisfy the user's requirements, the combination chain will be abandoned and another combination chain will be found. Finally, select the optimal service chain in the set of service chains to meet the needs of users. 3. Build service composition framework and test to verify feasibility. In this paper, a large number of service data are prepared, and a test scheme is designed for the service composition method based on causality matrix and graph theory mentioned above, and the corresponding criteria are established. The experimental results show that the dynamic composition of services can be realized efficiently and accurately under the proposed framework.
【學(xué)位授予單位】：河南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.09;TP391.1

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