運用物件導向框架以封裝Legacy System整合SOA之研究

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题名:	運用物件導向框架以封裝Legacy System整合SOA之研究
作者:	鄭玉祺
贡献者:	資訊管理研究所碩士在職專班
关键词:	服務導向架構既存系統封裝物件導向資料繫結
日期:	2010
上传时间:	2011-10-20 12:12:33 (UTC+8)
摘要:	國內商業資訊系統經過多年的發展，大型主機均已成為核心業務系統之主力，雖不能否認其長期受企業組織依賴的穩定、安全與效能等優點，然而面對其逐漸龐大之軟硬體維護費用與其功能擴充上的限制，成為企業組織面臨激烈市場競爭中沉重的負擔。這些核心的大型系統逐漸地失去了其競爭力與營運價值，但考量企業營運的實質需要而無法立即撤換，這類既存系統將長期並存在組織的資訊系統架構中，如何整合並活化這類系統已成為現今資訊管理實務的重要課題之一。本研究著重在採用SOA(Service Oriented Architecture)封裝（Wrapping) 企業組織既存系統(Legacy Systems)的處理模式並討論其效益及優缺點，也針對以主機-終端伺服架構（Host-Terminal)資訊系統與新開發系統間的統合問題，從相關文獻中解析各種已發展出來的解決方案及概念模型，整合並提出一個符合實務需求的SOA Framework封裝既存系統的理論模型，可在不變更舊有系統程式碼的情形下，快速將原有系統功能重新整合，提供以Web Service為介面透過SOA架構，可將多個服務或交易複合成單一服務介面，賦予企業組織既存系統新的生命以延續其營運價值及效益。 After years of development on business information system, Mainframe has become the core business system used by many corporations. Although these core systems, trusted by enterprises for a long time, are stable, safe, and efficient, the gradually expanded maintenance fee of software and hardware and the limitation of the expansion on functions have become a burden to enterprises while they face the radical competition from markets. These mainframe systems are gradually losing their competition and running value, but they cannot be banished immediately in regarding to the needs of running business. These Legacy Systems will still stay in the information system framework of enterprises. How to integrate and revitalize these systems is now a vital issue in information management practice. The study has two purposes. The former focused on the processing model of SOA framework wrapping enterprise Legacy System and discussed about its advantage and disadvantage. The latter, through analyzing some developed solutions and conceptual models from related documents, aimed on offering a theoretically practical model of SOA framework wrapping Legacy systems to solve the problems of the integration of Host-Terminal framework information systems into new developed systems. The model could: first, rapidly integrate the original systems into the new ones without change the original system programs and offer a Web-Service based interface, combined with multiple systems wrapped by SOA framework, and, second, give the Legacy Systems a new life for the extension of their running value and benefit.
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