Esper

Esper_(software)Developer(s)| EsperTech Inc.

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Written in| Java, C#
Operating system| Cross-platform
Type| Complex Event Processing
License| GPL v2
Website| www.espertech.com/esper

Esper is an open-source Java-based software product for Complex event processing (CEP) and Event stream processing (ESP), that analyzes series of events for deriving conclusions from them.

Esper extends the SQL-92 standard for its engine and enterprise framework, providing Aggregate function, Pattern matching, event windowing and joining. Esper implements Event-driven programming and event-driven architecture.

Esper was created in 2006 by EsperTech Inc. It offers a Domain-specific language for processing events called Event Processing Language (EPL). EPL is a Declarative programming language for analyzing time-based event data and detecting situations as they occur.

Esper is a Java-based application but has been ported to the C# programming language and is available for the .NET Framework under the name NEsper.

EsperTech Inc. provides Esper Enterprise Edition[1] with enterprise-ability features.

## Contents

* 1 Example
* 2 Related systems
* 3 See also
* 4 References
* 5 External links

## Example

This example[2] illustrates a simple EPL query that outputs a row immediately when within a sliding window of 3 minutes the number of order events reaches 5 or more events.

select count(*) from OrderEvent#time(3 min) having count(*) >= 5

## Related systems

* Rapide (Stanford)
* StreamSQL: StreamSQL is a query language that extends SQL with the ability to process real-time data streams.

## See also

* Complex event processing (CEP) - A related technology for building and managing event-driven information systems.
* Data Stream Management System (DSMS) - A type of software system for managing and querying data streams
* Event correlation
* Event-driven architecture — (EDA) is a software architecture pattern promoting the production, detection, consumption of, and reaction to events.
* Event stream processing — (ESP) is a related technology that focuses on processing streams of related data.
* Operational intelligence — Both CEP and ESP are technologies that underpin operational intelligence.
* Pattern matching
* Real-time business intelligence — Business Intelligence is the application of knowledge derived from CEP systems
* Real-time computing — CEP systems are typically real-time systems
* Real time enterprise

## References

1. ↑ "Esper Enterprise Edition". Espertech.com. http://www.espertech.com/products. Retrieved 2015-03-08.
2. ↑ "Page Redirection". www.espertech.com/esper. http://espertech.com/esper/solution_patterns.php#aggregate-0. Retrieved 2015-03-08.

## External links

* Esper Official Website
* EsperTech Inc.
* Research Papers referencing Esper, by Google Scholar
* Analysis of Complex Event Processing with Esper by Eric Miller, a book on Esper and CEP.
* Event Processing in Action by Opher Etzion and Peter Niblett, Manning Publications (ISBN 9781935182214), a book that provides Esper examples
* Open Source SOA by Jeff Davis, Manning Publications (ISBN 1933988541), a book that provides examples of Esper for monitoring web services
* OSWorkflow: A guide for Java developers and architects to integrating open-source Business Process Management, by Diego Adrian Naya Lazo, PACKT (ISBN 978-1847191526 ), a book with a chapter on Esper
* Fraunhofer CEP Market Overview, by Fraunhofer, year 2010
* Forrester Wave for Complex Event Processing, by Forrester - Oct. '09
* Real-Time Stream Processing as Game Changer in a Big Data World with Hadoop and Data Warehouse, InfoQ - Sept. '14

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