Esper
The Esper component supports the Esper Library for Event Stream Processing. The camel-esper library is provided by the Camel Extra project which hosts all *GPL related components for Camel.
URI format
When consuming from an Esper endpoint you must specify a pattern or eql statement to query the event stream.
Pattern example:
EQL example:
Options
Name |
Default Value |
Description |
|---|---|---|
|
false |
Available as of camel-extra 2.11.3: |
|
|
The Esper Pattern expression as a String to filter events |
|
|
The Esper EQL expression as a String to filter events |
You can append query options to the URI in the following format, ?option=value&option=value&...
EsperMessage
From Camel 2.12 onwards the esper consumer stores new and old events in the org.apacheextras.camel.component.esper.EsperMessage message as the input Message on the Exchange. You can get access to the esper event beans from java code with:
By default if you get the body of org.apacheextras.camel.component.esper.EsperMessage it returns the new EventBean as in previous versions.
Demo
There is a demo which shows how to work with ActiveMQ, Camel and Esper in the Camel Extra project
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