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_(software)
Developer(s)EsperTech Inc.
Stable release
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Repository
Written inJava, C#
Operating systemCross-platform
TypeComplex Event Processing
LicenseGPL v2
Websitewww.espertech.com/esper

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

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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
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See also

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References

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