Complex event processing: Difference between revisions

Revision as of 13:51, 23 September 2006

Revision as of 21:27, 26 September 2006

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A more systemic example of CEP involves a car, some sensors and an accident. Imagine that a car has several sensors on it. It is able to measure the tires' pressure, speed, seat occupied (is someone sitting in a seat) and has two buttons "Help" and "Cancel."

Imagine the car is riding and the tire pressure of one of the tires moves from 45 PSI to 41PSI over 5 minutes. The event "lossofTirePresure" is announced. This event triggers a process which analyses the pressure loss. The pressure is still within safety tolerances, but it notes the pressure loss into the car's maintanencemaintenance log, and alerts the driver via the car's portal that the tire pressure needs to be taken care of. It also determines the closest gas station that advertizes an air-compressor and displays that for the driver's convienceconvenience.

Imagine that same car has a significant pressure loss in the front, left tire. They change from 45 PSI to 20PSI in 2 seconds. These are announced as separate events of "blowOutTire". And the car's process determines that and takes appropriate measures to keep the car and occupants safe. It alerts the driver and takes actions to slow down the car by anti-lock breaking techniques to bring the car to a stop.