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Composite events in Chimera

  • Active Databases
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Advances in Database Technology — EDBT '96 (EDBT 1996)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 1057))

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Abstract

In this paper, we extend event types supported by Chimera, an active object-oriented database system. Chimera rules currently support disjunctive expressions of set-oriented, elementary event types; our proposal introduces instance-oriented event types, arbitrary boolean expressions (including negation), and precedence operators. Thus, we introduce a new event calculus, whose distinguishing feature is to support a minimal set of orthogonal operators which can be arbitrarily composed. We use event calculus to determine when rules are triggered; this is a change of each rule's internal status which makes it suitable for being considered by the rule selection mechanism.

The proposed extensions do not affect the way in which rules are processed after their triggering; therefore, this proposal is continuously evolving the syntax and semantics of Chimera in the dimension of event composition, without compromising its other semantic features. For this reason, we believe that the proposed approach can be similarly applied for extending the event language of other active database systems currently supporting simple events or their disjunction.

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Authors and Affiliations

  1. Dipartimento di Automatica e Informatica, Politecnico di Torino, Corso Duca degli Abruzzi, 24, I-10129, Torino, Italy

    Rosa Meo & Giuseppe Psaila

  2. Dipartimento di Elettronica e Informazione, Politecnico di Milano, Piazza L. Da Vinci, 32, I-20133, Milano, Italy

    Stefano Ceri

Authors
  1. Rosa Meo
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  2. Giuseppe Psaila
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  3. Stefano Ceri
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Peter Apers Mokrane Bouzeghoub Georges Gardarin

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© 1996 Springer-Verlag Berlin Heidelberg

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Meo, R., Psaila, G., Ceri, S. (1996). Composite events in Chimera. In: Apers, P., Bouzeghoub, M., Gardarin, G. (eds) Advances in Database Technology — EDBT '96. EDBT 1996. Lecture Notes in Computer Science, vol 1057. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0014143

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  • DOI: https://doi.org/10.1007/BFb0014143

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-61057-1

  • Online ISBN: 978-3-540-49943-5

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