Esper (software)

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
8.4.0 / February 24, 2020 (2020-02-24) [1]
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[2] with enterprise-ability features.

Example

This example[3] 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

See also

References
  1. "Esper Change History". Espertech. 2017-11-29. Retrieved 2018-02-20.
  2. "Esper Enterprise Edition". Espertech.com. Retrieved 2015-03-08.
  3. "Page Redirection". www.espertech.com/esper. Retrieved 2015-03-08.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.