CEP/ESP Engine for Java / News: Recent posts

Esper has moved to Codehaus,
please check us at http://esper.codehaus.org

The new Esper release adds output rate limiting and support for an unlimited number of streams for outer joins.

Esper is a embeddable 100% Java ESP/CEP engine for event stream processing and event correlation.

Esper has released 0.8.5 with support for grouping and aggregation. Esper is aopen-source realtime DB/ESP/CEP engine, is 100% Java, embeddable. Works like a database just up-side down, store the queries and run the data through, gives you results ASAP.

The Esper 0.8.0 engine has cool new features for event stream processing: support for Java interfaces and superclasses or events, and indexed/nested/mapped event support.

The open-source Esper engine for Java ESP and CEP applications has released an alpha version 0.7.5 with some important new features, such as outer joins between event streams and use of results in event pattern filters.

http://esper.sf.net

Changes in version 0.7.5
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* (API) A configuration can now optionally be supplied to an engine instance via the Configuration parameter to EPServiceProviderManager.
This enabled event patterns and EQL to use short event names not requiring making the fully-qualified Java class name optional
* (EQL) Outer joins: left, right and full join on 2 streams
* (EQL) IS NULL, = NULL, IS NOT NULL, <> and != now supported in where clause
* (EQL) New built-in function MAX(a, b,...), MIN(a, b,...)
* (Event Pattern) Use of results in filters, such as "every A=X -> every B=X(objectID=A.objectID)"
* (Event Pattern) improved removal of permanently false patterns (e.g. B arrives in 'A and not B')
* (EQL and Event Pattern) Removed requirement that event names have () postfix, e.g. 'every A=X' equivalent to 'every A=X()'
* (Documentation) new section on builtin functions
* (Examples) Sample ATM added to show simple join... read more

Esper, the first open-source event stream processor, has released it's first alpha 0.7 version for ESP applications. Check out http://esper.sf.net