Complex event processing: Difference between revisions

Revision as of 20:04, 14 July 2006

Revision as of 20:15, 14 July 2006

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'''Complex Event Processing''', or '''CEP''', is a technology for building and managing event-driven information systems. CEP is primarily a set of programming language constructs that deal with the task of processing multiple streams of event data with the goal of identifying the meaningful events within those streams. CEP employs techniques such as detection of complex patterns of many events, event correlation and abstraction, event hierarchies, and relationships between events such as causality, membership, and timing, and event-driven processes.

CEP provides the core event language processing capabilities for [[Event Stream Processing (ESP)]], or ESP, which includes technologies such as event databases, and event visualization software.

==A Conceptualconceptual Descriptiondescription of CEP==

Examples of events include church bells ringing, the appearance of a man in a tuxedo or morning suit, a girl in a flowing white gown and rice flying through the air. A complex event is what one infers from the simple events: a wedding is happening. CEP is a programming language that helps discover complex, inferred events by analysing and correlating other events: the bells, the man and girl in wedding gear and the rice flying through the air.

==Another Systemicsystemic Exampleexample of CEP==

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

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Like simple events, complex events are also announced and triggers processes. This process uses the GPS system and car communication system to look up how to contact the local sheriff and ambulances via a web service. Armed with this information, the car contacts the emergency responders and saves the life of the incapacitated driver.

==Academic Researchresearch==

* [http://www.cs.brown.edu/research/aurora Aurora] (Brandeis University, Brown University and MIT)

* [http://www-db.stanford.edu/stream STREAM] (Stanford University)

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==See also==

* [[Event Stream Processing]] (ESP)]] ESP is the general class of technologies that includes CEP that process streams of data

* [[Real-time computing]] CEP systems are typically real-time systems

* [[RFID]] Radio Frequency Identification, or RFID, requires CEP

==External links==

*[http://www.amazon.com/exec/obidos/tg/detail/-/0201727897 ''The Power of Events]'' by David Luckham (ISBN 0201727897), from Stanford University, a book on CEP.

*[http://www.complexevents.com David Luckham's CEP web site]

*[http://www.eventstreamprocessing.com Event Stream Processing Resource Site]