Objects Mapping in Object-Oriented Service Bases

概要

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We are implementing a distributed system which provides extensible as well as integrated environments for users and application programs to access and combine distributed resources conveniently. The system is based on the concept of object-oriented service bases. Distributed resources are abstracted as objects. Three layered views about objects are divided : (1)The external view is the view shown to users or application programs. Objects in the external view are transparent and easy to be used. (2)In the conceptual view, attributes of a resource is abstracted as an object. The difference of media types, heterogeneity and location distribution of resources are absorbed in this layer. Object management in this layer is based on a directory. (3)An object in the internal view is the entity of a resource. The internal view about an object concerns its physical realization in a computer. Objects in the conceptual view are reflected to their respective objects in the internal view. A service base can be seen as a software package built on an existing operating system to provide mapping from the objects in the external view to the objects in the internal to realize transparency and to absorb heterogeneity and different media types. The overview of our system can be referred to [1] and [2]. This paper mainly discusses the objects mapping mechanism, and the query methods provided to users.
一般社団法人情報処理学会の論文
1990-03-14