因應網路服務之BPEL引擎重構

Abstract

服務導向與物件導向是兩種主流的程式設計方式，兩者分別流行於企業與開源 的開發者。過去曾有人提出服務導向與物件導向程式設計的結合，但仍未完全發 揮當今大量開源程式碼的優勢。有鑑於此，一個可以直接將以物件導向程式語言 撰寫之程式轉換為網路服務的系統因應而生。該系統生成的網路服務又可進一步 作為組合服務的元件，搭配上對應組合服務組成的使用者介面(UI)即可形成一個 供客戶端使用的完整應用程式。 本研究提出一個可兼容由開源程式碼生成之服務元件，運行業務過程執行語 言(BPEL)之組合服務引擎。此引擎的兩個關鍵功能為:將服務元件整合為組合服 務的後端與將UI元件整合為組合服務的前端。本研究亦提出使用UML表示一個組 合服務，並生成其對應描述文檔的作法。

Service-oriented and object-oriented programming are two mainstream program- ming paradigms, and they are adopted mostly by businesses and open source devel- opers respectively. Integration of service-oriented and object-oriented programming has been proposed, but it does not fully utilize the abundance of open source code nowadays. Therefore, a system is developed to directly convert open source code written in object-oriented language to web services as the basis for a composite service. Furthermore, the composite service can be presented with a user interface composed of UI components, forming an application for end users. In this work, a composition engine to run BPEL with the service components generated from open source code is proposed. The engine has two key features: inte- grating service components as backend and UI components as frontend. This work also proposes a methodology to model composite service with UML and generate its corresponding description.