Esper (software)

Esper_(software)
Developer(s) EsperTech Inc.
Stable release 5.2.0 / March 3, 2015 (2015-03-03)
Written in Java, C#
Operating system Cross-platform
Type Complex Event Processing
License GPL v2
Website http://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.

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.win:time(3 min) having count(*) >= 5

Related systems

See also

References

  1. "Esper Enterprise Edition". Espertech.com. Retrieved 2015-03-08.
  2. "Page Redirection". www.espertech.com/esper. Retrieved 2015-03-08.

External links

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