Complex event processing: Difference between revisions

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In addition, events that represent detected situations can also be combined with other events in order to detect more complex situations. For example, in the final situation the car is moving normally and suffers a blown tire which results in the car leaving the road and striking a tree, and the driver is thrown from the car. A series of different situations are rapidly detected. The combination of "blowOutTire", "zeroSpeed" and "driverLeftSeat" within a very short period of time results in a new situation being detected: "occupantThrownAccident". Even though there is no direct measurement that can determine conclusively that the driver was thrown, or that there was an accident, the combination of events allows the situation to be detected and a new event to be created to signify the detected situation. This is the essence of a complex (or composite) event. It is complex because one cannot directly detect the situation; one has to infer or deduce that the situation has occurred from a combination of other events.

==Types==

Most CEP products can be classified into two categories:

# Aggregation-oriented CEP

# Detection-oriented CEP

An aggregation-oriented CEP system executes on-line algorithms as a response to event data entering the system. A simple example is to continuously calculate an average based on data in the inbound events.

Detection-oriented CEP is focused on detecting combinations of events called events patterns or situations. A simple example of detecting a situation is to look for a specific sequence of events.

There also exist hybrid approaches.

==Integration with business process management==