云計(jì)算中面向SaaS的QoS建模研究與分析
本文選題:云計(jì)算 + SaaS; 參考:《南京航空航天大學(xué)》2012年碩士論文
【摘要】:云計(jì)算技術(shù)的提出和興起,正逐漸改變?nèi)藗兪褂梅⻊?wù)和資源的方式,同云計(jì)算時(shí)也成為計(jì)算機(jī)應(yīng)用領(lǐng)域的研究熱點(diǎn)。IT資源服務(wù)化是云計(jì)算最重要的外部特征,當(dāng)前,亞馬遜(Amazon)、IBM、谷歌(Google)、Sun、微軟(Microsoft)等國(guó)際大型IT公司已紛紛建立并對(duì)外提供各種云計(jì)算服務(wù)。美國(guó)國(guó)家標(biāo)準(zhǔn)與技術(shù)研究院(NIST)指出,當(dāng)前云計(jì)算服務(wù)分為基礎(chǔ)設(shè)施即服務(wù)IaaS、平臺(tái)即服務(wù)PaaS、軟件即服務(wù)SaaS3個(gè)層次。其中SaaS是基于云計(jì)算環(huán)境的新一代軟件服務(wù)模式。 QoS(Quality of Service)即服務(wù)質(zhì)量。Web服務(wù)的QoS指的是Web服務(wù)的非功能性屬性,如性能、可靠性、可用性和安全性。國(guó)內(nèi)外研究者們嘗試從多個(gè)角度對(duì)QoS相關(guān)問(wèn)題開(kāi)展研究,如動(dòng)態(tài)服務(wù)選擇和服務(wù)組合等。在云計(jì)算的環(huán)境下,SaaS服務(wù)的QoS屬性變得復(fù)雜,SaaS的特性影響到了QoS管理框架的各個(gè)方面。 本文先后探討了: 1.云計(jì)算環(huán)境下的QoS管理框架、傳統(tǒng)Web服務(wù)和云計(jì)算環(huán)境下SaaS服務(wù)的異同,并針對(duì)SaaS服務(wù)的平臺(tái)依賴性和多租戶特性,對(duì)SaaS服務(wù)的QoS屬性進(jìn)行了新的定義,將所依賴的平臺(tái)QoS屬性作為參考屬性加入服務(wù)的QoS定義。同時(shí)為了支持SaaS服務(wù)的QoS建模,將QoS屬性進(jìn)行了抽象,并給出了多個(gè)服務(wù)的QoS評(píng)估的方法。 2.為了支持在SaaS服務(wù)組合建模時(shí)就可以對(duì)服務(wù)的QoS性質(zhì)進(jìn)行獲取、度量、分析。本文將提取出的抽象QoS屬性擴(kuò)展進(jìn)UML序列圖進(jìn)行服務(wù)建模,并給出了BPEL活動(dòng)的帶有抽象QoS屬性的擴(kuò)展UML序列圖模型。考慮到UML的形式化分析的不足,對(duì)擴(kuò)展后的UML序列圖進(jìn)行了形式化的定義以方便后續(xù)研究。 3.通過(guò)一個(gè)云平臺(tái)的旅行訂票系統(tǒng),驗(yàn)證了以上過(guò)程的正確性和可行性,并根據(jù)已有研究將UML模型轉(zhuǎn)化為形式化模型進(jìn)行QoS的驗(yàn)證和分析。
[Abstract]:With the development and rise of cloud computing technology, people are gradually changing the way people use services and resources. It resource service is the most important external feature of cloud computing. Major international IT companies, such as Amazon, IBM, Google, Sun and Microsoft, have set up and offered a variety of cloud computing services. The National Institute of Standards and Technology (NIST) points out that cloud computing services are currently divided into infrastructure as a service IaaS, platform as a service PaaS, and software as a service SaaS3. SaaS is a new generation of software service model based on cloud computing environment. QoS(Quality of Service QoS refers to the non-functional attributes of a Web service, such as performance, reliability, availability, and security. Researchers at home and abroad try to study QoS issues from a variety of perspectives, such as dynamic service selection and service composition. In the cloud computing environment, the QoS properties of SaaS services become complex and affect all aspects of the QoS management framework. This paper discusses: 1. The QoS management framework in cloud computing environment, the similarities and differences between traditional Web services and SaaS services in cloud computing environment, and aiming at the platform dependence and multi-tenant characteristics of SaaS services, the QoS attributes of SaaS services are defined. Add the dependent platform QoS attribute as a reference attribute to the service's QoS definition. In order to support the QoS modeling of SaaS services, the QoS attribute is abstracted and the evaluation method of QoS for multiple services is given. 2. In order to support the modeling of SaaS services composition, the QoS properties of services can be acquired, measured and analyzed. In this paper, the extracted abstract QoS attributes are extended into the UML sequence diagram for service modeling, and an extended UML sequence graph model with abstract QoS attributes for BPEL activities is presented. Considering the shortage of formal analysis of UML, the extended UML sequence diagram is formalized to facilitate further research. 3. The correctness and feasibility of the above process are verified by a travel booking system based on the cloud platform, and the UML model is transformed into a formal model for QoS verification and analysis according to the existing research.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:TP3
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