Esper (software) explained

Esper_(software)
Developer:EsperTech Inc.
Latest Release Version:check website
Operating System:Cross-platform
Programming Language:Java, C#
Genre:Complex Event Processing
License:GPL v2

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

Related systems

See also

External links

Notes and References

  1. Web site: Esper Enterprise Edition. Espertech.com. 2015-03-08.
  2. Web site: Page Redirection . www.espertech.com/esper . 2015-03-08.