By default, all transactions, operations and metadata events are passed to the DataSourceListener event handlers. An event filter can be implemented to filter the events sent to the handlers. The filter could select certain operations on certain tables containing certain column values, for example

Filters are additive: if more than one filter is set for a handler, then all filters must return true in order for the event to be passed to the handler.

You can configure filters using the Java application properties file:

# handler "foo" only receives certain events
gg.handler.one.type=jms
gg.handler.one.format=mytemplate.vm
gg.handler.one.filter=com.mycompany.MyFilter

To activate the filter, you write the filter and set it on the handler; no additional logic needs to be added to specific handlers.