The Data Load Controller uses an internal cache (Ehcache) to store events. The default configuration can be
found in the ehcache.xml (located at data-connectors-core/src/main/resources/ehcache.xml).
The cache configuration can be customized based on the nature
and size of the project’s data. This can be done by including your own ehcache.xml
in your project’s classpath.
You may override the heap setting and how long the events and event handlers
will be kept in cache.
If you wish to implement a custom event handler, maybe to write an event to logs
(in addition to cache), you would need to implement a custom event handler.