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Information flow based event distribution middleware
by:In: Electronic Commerce and Web-based Applications/Middleware, 1999. Proceedings. 19th IEEE International Conference on Distributed Computing Systems Workshops on
(1999)
, p. 114-121.
Abstract
Event distribution middleware supports the integration of
distributed applications by accepting events from information producers
and disseminating applicable events to interested consumers. We present
a flexible new model, the Information Flow Graph IFG, for specifying
the flow of information in such a system. We illustrate the use of the
IFG for: content-based publish/subscribe; stateless event
transformations that consolidate events from diverse sources; and
stateful event interpretation functions for deriving trends, summaries,
and alarms from published events and for defining equivalent event
sequences. We introduce two techniques for efficient implementation of
such systems: a flow graph rewriting optimization which allows stateless
IFGs to be converted to a form which can exploit efficient multicast
technology developed for content-based publish/subscribe system; and an
algorithm for converting a sequence of events to the shortest equivalent
sequence of events with respect to an event interpretation
function


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