RIA: An Object-Oriented Extensible View System for Computer-Aided Design Applications

计算机辅助设计（CAD）系统通常使用面向对象的数据库（OODB）将不同的设计数据集成到一个由所有设计工具访问的存储库中。这样一个中央数据库是阻碍CAD系统随时间扩展的关键瓶颈，并迫使所有设计工具在相同的（全面的，因此极其复杂的）数据模型上工作。显然，在提供具有定制设计表示的设计工具和将设计数据集成到一个统一模型中之间存在冲突。这项研究工作通过两个高级特性扩展OODB技术来解决这个问题：(1)设计视图和(2)模式更改支持。为了支持定制的设计表示，实现了管理CAD数据库的个性化工具接口的机制（这使单个设计工具不必维护全局数据模型和本地设计视图之间的映射）。为了支持CAD系统的可扩展性，视图系统将增加模式更改功能。正是这种两种功能的独特集成，使面向对象的可扩展视图系统（OOEVS）成为支持CAD应用程序的全新工具。将进行广泛的实验来评估OOEVS及其在构建复杂软件系统（特别是CAD系统）中的应用。该研究为CAD工具集成的重要问题提供了解决方案，并以强大的功能扩展了最先进的数据库。

RIA: An Object-Oriented Extensible View System for Computer- Aided Design Applications Computer-Aided Design (CAD) systems typically use an object- oriented database (OODB) to integrate diverse design data into one repository accessed by all design tools. Such a central database is a critical bottleneck preventing the extensibility of the CAD system over time, and forcing all design tools to work on the same (comprehensive and hence extremely complex) data model. Clearly, there is a conflict between supplying design tools with customized design representations and integrating design data into one uniform model. This research effort addresses this problem by extending OODB technology by two advanced features: (1) design views and (2) schema change support. To support customized design representations, mechanisms to manage individualized tool interfaces of the CAD database are being implemented (which free individual design tools from having to maintain mappings between the global data model and local design views). To support the extensibility of the CAD system, the view system will be augmented with schema change functionality. It is this unique integration of both capabilities that makes the Object-Oriented Extensible View System (OOEVS) a radically new tool for supporting CAD applications. Extensive experiments will be performed to evaluate OOEVS and its application for building complex software systems (in particular, CAD systems). The proposed research is significant in that it provides a solution to the important problem of CAD tool integration and extends state-of-the-art databases with powerful functionalities.