Event Stream Processing, or ESP, is a set of technologies designed to assist the construction of event-driven information systems. ESP technologies include event visualization, event databases, event-driven middleware, and event processing languages, or complex event processing (CEP). ESP deals with the task of processing multiple streams of event data with the goal of identifying the meaningful events within those streams, employing 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. Image File history File links Please see the file description page for further information. ... It has been suggested that this article or section be merged into Event Stream Processing. ... It has been suggested that this article or section be merged into Event Stream Processing. ...

ESP enables applications such as algorithmic trading in financial services, RFID event processing applications, fraud detection, process monitoring, and location-based services in telecommunications. Algorithmic trading is the use of computer programs to trade financial instruments (e. ... An EPC RFID tag used for Wal-Mart Radio Frequency Identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. ...

Example

This example of an EPL (Event Processing Language) modelled on SQL illustrates how such a language may be used to perform complex event processing. This code fragment detects weddings among a flow of external "events" such as 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" or "composite" event is what one infers from the individual simple events: a wedding is happening.

 WHEN Person. Gender EQUALS “man” AND Person. Clothes EQUALS “tuxedo” FOLLOWED-BY Person. Clothes EQUALS “gown” AND Church_Bell OR Rice_Flying WITHIN 2 hours ACTION Wedding 

See also

• Complex Event Processing (CEP) A related technology for building and managing event-driven information systems.
• Real-time computing ESP systems are typically real-time systems
• RFID Radio Frequency Identification, or RFID, requires ESP
• SCADA Supervisory Control And Data Acquisition, a similar technology used in engineering applications
• High frequency computing

Complex Event Processing, or CEP, is a technology for building and managing event-driven information systems. ... Realtime redirects here. ... An EPC RFID tag used for Wal-Mart Radio Frequency Identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. ... SCADA is the acronym for Supervisory Control And Data Acquisition. ... High frequency computing is a class of computer programming applications that relate to the processing of high-volume data streams, usually in real-time or near real-time. ...

References

• MIT/Brown/Brandeis "Aurora" Stream Processing Project
• The Power of Events by David Luckham (ISBN 0-201-72789-7), from Stanford University, a book on CEP.
• Separating the Wheat from the Chaff Article about CEP as applied to RFID, appeared in RFID Journal

External links

• Article "Event-Driven Architecture Overview"