Towards a semantic event service for distributed active database applications

This paper proposes an approach to building event services for active database applications. It introduces dimensions to characterize distributed event deenition, detection, production and notiication. The core of our approach is a parametric event service called QUET-ZAL that has three interfaces, each of them implementing the given dimensions as parameters. Therefore, diierent event (detection) models may be deened simply by giving values to these parameters. Such an approach provides exible deenition, detection, production and notiica-tion of events according to application needs. Since our service is based on a consumer-producer principle, it can be combined with any producer and consumer, facilitating in this way communication and collaboration between distributed components such as classical applications, database transactions, primitive event detectors or event notiication tools.