Abstract
Many engineering applications need to response to unpredictable events in a timely manner. Active database systems provide an event-driven rule processing capability to meet this requirement. In this paper, we present an intelligent database which integrates an object-oriented database (OODB) with an expert system, CLIPS. The paper describes the design and implementation of the rule manager of this intelligent database. In the rule manager, event-condition-action (ECA) rules are represented as first class objects of the OODB. A rule definition language (RDL) has been developed to manipulate ECA rules in a declarative way. A graphical user interface (GUI) also supplies a template to interactively define, delete, update and check ECA rules. Detection of time events, method events, absolute events and composite events is supported by the rule manager. The CLIPS inference engine is used to control condition evaluation and action execution after an ECA rule is triggered. Finally, a typical workflow application is used to illustrate the functionality of the system.
Published Version
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