WOO-DB物件導向資料庫之Java聯結

Abstract

此篇論文主要在實作一個架構在WOO-DB此物件導向資料庫上的Java語言 聯結系統，底層的WOO-DB物件導向資料庫為資料會研究發展的穩定儲存機 制。此篇論文最大的挑戰有二：一為依據ODMG制定的Java語言聯結標準， 透過WOO-DB資料庫提供的C語言界面，緊密結合Java及底層WOO-DB資料庫 兩物件模組，其中交易及執行緒模型亦包含在應如何結合此兩物件模組的 討論項目中；另一為以物件導向觀點設計系統內元件，使各個元件具備獨 立運作之特性，在系統發展的長期規畫上，將有助於系統轉移，達到軟體 工移的最終目標：元件重用(component reuse)，換句話說，由於整個結 構元件獨立､層級功能明白界定﹐因此透過遠端程序呼叫(Remote Method Invocation﹐RMI)﹐針對Applet本身對安全性的要求，只要稍做修改，即 可輕易將系統轉型至主從式架構。此外，文中將詳細說明永續性特點( persistence-reachability)的觀念及應用時機；同時，說明此系統的整 體架構､設計理念及程式設計流程。最後針對C、C++、Java三個系統設計 四個範例，進行系統效能分析。 This paper presents the design and implementation of an ODMG-compliant Java binding system upon WOO-DB, an ODMG- compliant client-server object database developed by Institute for Information Industry. There are two main challenges of this system. One is to seamlessly connect Java object model with WOO-DB's object model represented in C API, following ODMG Java Binding Standard. Issues of bridging these two object models are given including the critical transaction and thread models. Another goal is to design an component-based system. A general framework for building such language binding system is addressed. Adopting Object-Oriented technology to design system class module can make it convenient to to port Application version to Applet version later. Descriptions about the characteristic of persistence-reachability is also addressed. Furthermore, to adhere the security constraint came with the Java Applet, a novel solution is also given. The current ODMG Java standards and programming flow are reported as an illustration. At last, we perform an system performance analysis separately with C、C++、Java language system.