Esper (software)
From Wikipedia, the free encyclopedia
| Esper_(software) | |
|---|---|
| Developer | EsperTech Inc. |
| Stable release | check website
|
| Repository | |
| Written in | Java, C# |
| Operating system | Cross-platform |
| Type | Complex Event Processing |
| License | GPL v2 |
| Website | www |
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.
This example[1] 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.
