IDA Dept. of Computer and Information science, Linköping University

IDA Technical Reports: abstract

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Fahl, G., Risch, T., and Sköld, M. (1993). AMOS - An Architecture for Active Mediators. Technical Report LiTH-IDA-R-93-13, Department of Computer and Information Science, Linköping University, Sweden. Accepted to Workshop on Next Generation Information Technologies and Systems (NGITS'92), Haifa, Israel, June 1993. (bibtex),

Abstract: AMOS (Active Mediators Object System) is an architecture to model, locate, search, combine, update, and monitor data in information systems with many work stations connected using fast communication networks. The approach is called active mediators, since it introduces an intermediate level of `mediator' software between data sources and their use in applications and by users, and since it supports 'active' database facilities. A central part of AMOS is an Object-Oriented (OO) query language with OO abstractions and declarative queries. The language is extensible to allow for easy integration with other systems. This allows for knowledge, now hidden within application programs as local data structures, to be extracted and stored in AMOS modules. A distributed AMOS architecture is being developed where several AMOS servers communicate, and where queries in a multi-database language are allowed to refer to several AMOS databases or other data sources. An overview is made of the architecture and components of AMOS, with references to ongoing and planned work.This paper presents an approach to object view management for relational databases. Such a view mechanism makes it possible for users to transparently work with data in a relational database as if it was stored in an object-oriented (OO) database. A query against the object view is translated to one or several internal queries against the relational database from which the answer is formed. The object view can also store its own data and therefore it must be possible to process queries that combine local data residing in the object view with data retrieved from the relational database. Keywords: Object-Oriented Query Processing, Object-Oriented Federated Databases (Presented at Next Generation Information Technologies and Systems (NGITS'93), Haifa, Israel, June 1993.)


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