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研究生： 巫燁棋
Wu, Ye-Chi
論文名稱： 賦允軟體即服務：支援服務導向應用軟體之演進敏捷性
Enabling Software-as-a-Service: Supporting Agility in Service-Based Application Evolution
指導教授： 焦惠津
Jiau, Hewijin Christine
學位類別： 博士
Doctor
系所名稱： 電機資訊學院 - 電腦與通信工程研究所
Institute of Computer & Communication Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 117
中文關鍵詞： 軟體即服務 、敏捷式軟體開發 、應用服務演進方法論 、服務演進監控框架
外文關鍵詞： Software-as-a-Service, agile development method, service-based application software evolution methodology, service evolution monitoring framework
相關次數： 點閱：172  下載：4 
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    • 隨著雲端與服務導向運算的發展，軟體即服務不僅代表軟體交付模式上改變，更帶來商業模式與軟體開發模式上的挑戰。軟體即服務的交付模式強調軟體服務提供的敏捷性，軟體使用者能夠免去軟體安裝與佈署的花費，改由輕型的客戶端軟體、如網頁瀏覽器，進行各種軟體應用服務的使用。在新型態的軟體交付模式下，軟體應用服務的可選擇性與多元性皆大大提升，持續地辨識市場及使用者需求的改變，並有效地進行軟體服務更新，成為應用軟體服務供應商獲取市場占有率的重要考量。

    為使持續提供有效的軟體服務，軟體演進相關開發技術扮演重要角色。本論文立基於過去十年間服務導向軟體開發架構的發展，專為服務導向應用軟體提出一套軟體演進開發方法論。著眼於面對經常發生的需求改變與運算環境改變，此方法論特別強調軟體演進支援的敏捷性。此方法論描述一系統性的開發方法，含括軟體演進需求辨識、軟體演進計畫研擬、到軟體演進實作中的各種開發活動。為支援該開發方法論，本論文發展一 Serv-Gears 軟體開發框架。該軟體開發框架主要落實一套應用服務監控機制。在此應用服務監控機制下，應用服務開發者可以依據服務演進考量，持續地開發服務監控腳本。透過引入真實的使用者資料，從數據上觀察監控腳本的有效性。此一監控機制與監控數據處理模型使得開發者可以有效地辨認服務演進需求與決定更新服務的時機。
    承襲本論文所提出的服務導向軟應用軟體演進方法論，Serv-Gears 軟體開發框架具有支援敏捷軟體開發的特性，不但提供有效的應用編程介面，同時也提供監控腳本開發環境，應用軟體開發者能夠以直覺的方式撰寫簡潔的程式腳本進行服務演進的各種開發工作。

    在開發方法論的落實方面，本論文以 Serv-Gears 框架為基礎實作一 WebHat 平台，並將提出的方法論的應用在程式教學上，透過本論文所提出的服務監控機制，WebHat 平台促使教學者能夠即時地提供有效的教學服務，提升學生在學習上的成果。透過 WebHat 平台的使用，本論文提供了三項研究數據，分別驗證 (1) 軟體即服務對學生學習成果的有效性；(2) Serv-Gears 框架對支援服務演進的有效性；以及 (3) 本研究之方法論及軟體開發框架在不同種類的服務演進上的效果探討。本論文的研究成果完整呈現所提出的方法論及框架對支援服務導向應用軟體在演進敏捷性上重要性，為軟體即服務的成功奠定基石。

    Software-as-a-Service (SaaS) is an emerging way to deliver software applications and brings the revolution of business model to software industry with emphasizing the ability of gaining market traction. To enable the operations of the new business model, software development support is required for rapid response to changing market requirements. This work addresses challenges of service-based application evolution. According to characteristics of service-oriented architecture, this work describes a methodology and develops tool support to facilitate continuous evolution planning and implementation of service-based applications. The methodology emphasizes the agility in developing and assessing evolution plans, and a Serv-Gears framework is developed to maintain a service-based monitoring mechanism. Serv-Gears framework provides an integrated environment for developers to involve in evolution need investigation even during the application runtime. Available resources, such as additional third-party service components and real data coming from application users, can be integrated in the evolution need investigation. Consequently, evolution planning can be effectively performed and specific evolution implementation can be conducted once change requirements are identified. The development support facilitates continuous evolution of application software to keep application services on demand.

    This thesis work evaluates the providing methodology and Serv-Gears framework in a programming teaching domain. A WebHat platform was introduced in an Introduction to Computer Science course to maintain the provision of teaching services. To demonstrate the effectiveness of this thesis work, several studies were conducted by teaching results. The results show the effectiveness of this work in terms of (1) facilitating the evolution of teaching services and (2) supporting the achievement of teaching goals. The providing service-based monitoring technique facilitates investigating evolution needs and updating application services to keep student engagement in programming learning. Enabling agility in continuous evolution plan development presents a key factor for leading service-based applications to achieve business goals. The providing methodology and Serv-Gears framework play an essential role for the success of the development of SaaS applications.

    Chapter 1 Introduction ................................................. 1 1.1 Delivering Software as a Service ....................... 1 1.2 Challenges of Service-Based Application Evolution ...... 2 1.2.1 Forces to Cause Evolution ........................ 2 1.2.2 A Development Model for Service Provision ........ 4 1.2.3 Existing Techniques to Support Service-Based Appli- tion Evolution ......................................... 5 1.3 Contribution ........................................... 7 2 Background................................................... 11 2.1 Service-Oriented Computing and Development Paradigm ... 11 2.2 State-of-the-Art Support on Service-Based Application Evo- lution .................................................... 13 3 A Methodology to Support Continuous Service-Based Application Evolution ..................................................... 17 3.1 Evolution Activities in Application Operations ........ 17 3.2 Requirements of Development Support ................... 20 4 Serv-Gears: A Framework for Rapid Service Evolution ......... 23 4.1 The Service-Based Monitoring Mechanism ................ 23 4.2 The Architecture of Serv-Gears ........................ 25 4.3 Specifying and Executing Monitoring Scripts ........... 28 4.4 Investigating Monitoring Data ......................... 34 4.5 Serv-Gears Implementation ............................. 42 5 WebHat: A Service-Based Program Evaluation Platform for Student Engagement in Assignments ..................................... 45 5.1 Providing Assistance as a Service in Programming Teaching .................................................. 46 5.2 Teaching Support of Existing E-Learning Systems ....... 47 5.3 Assignment Practice with WebHat ....................... 49 5.4 Example Assignment: A SIMPLE Project .................. 52 5.5 The Implementation of WebHat Platform ................. 57 6 Case Studies ................................................ 63 6.1 Evaluation of WebHat Platform in SIMPLE Project ....... 64 6.1.1 Effects of Dynamic Evaluation Service Adjustment 65 6.1.2 Correlation between Engagement Level and Final Per- formance .............................................. 67 6.1.3 Study Summary and Discussion .................... 70 6.2 Evaluation of Serv-Gears Framework based on SIMPLE Project Data ...................................................... 71 6.2.1 Study Settings .................................. 72 6.2.2 Data Collection ................................. 74 6.2.3 Study Results ................................... 75 6.2.4 Discussion on Performance Expectation ........... 78 6.3 An Empirical Study on Service Evolution in IntroCS’1213 81 6.3.1 Study Settings and Data Collection .............. 81 6.3.2 Service Evolution Concerns and Development ...... 83 6.3.3 Investigating the Effectiveness of Development Sup- port for Service Evolution ............................ 87 6.3.4 Study Summary ................................... 95 7 Conclusion .................................................. 99 7.1 Summary of Contributions .............................. 99 7.2 Future Work .......................................... 101 References ................................................... 105 Vita ......................................................... 117

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