Moving Active Functionality from Centralized to Open Distributed Heterogeneous Environments
(M. Cilia; C. Bornhovd; A. Buchmann; Databases and Distributed Systems
Group, Department of Computer Science Darmstadt University of
Technology – Darmstadt, Germany)
From the introduction:
For
example, consider the following business rule: ”when the volume of corn
falls below 1200 tons, and the corn comes from Euroland, and Euro/US$
is under 0.8 then bid for all at 2.30 US$ per ton, and also notify the
manager”. Involved events and data are coming from diverse sources,
here and also the execution of actions is performed on different (sub-)
systems. Observe that events and actions are not necessarily directly
related with database operations.
In such scenarios, the required
active functionality should be moved outside of the active database
system by offering a flexible service that runs decoupled from the
database, and that can be combined in many different ways and used in a
variety of environments. A service-based architecture seems to be
appropriate, in which an active functionality (ECA rule) service can be
seen as a composition of other services, like event detection, event
composition, condition evaluation, and action execution. – goto
originally Posted to cep.weblogger.com by David Soul on 2/20/04; 12:09:41 AM
in the CEP section
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NASA image of the day
Curiosity at 'Cumberland'NASA's Mars rover Curiosity used its front left Hazard-Avoidance Camera for this image of the rover's arm over the drilling target "Cumberland" during the 275th Martian day, or sol, of the rover's work on Mars (May 15, 2013). The rover team plans to use Curiosity's drill to collect a powdered sample from the interior of the rock for analysis by laboratory instruments inside the rover. This is the mission's second rock-drilling target. The rover drove from its position beside the first drilling target, "John Klein," to its position beside Cumberland with drives of 121 inches (308 centimeters) on Sol 273 (May 13) and 26.6 inches (67.5 centimeters) on Sol 275. Curiosity's total odometry on Mars is now 2,385 feet (727 meters). Image credit: NASA/JPL-Caltech
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