Existing message processor implementations are created using the Quartz enterprise job scheduler. If needed, you can create your own implementations of message processors by creating a Java class that implements the MessageProcessor interface. You then select the Add Custom Message Processor option when adding a message processor and specify your implementation class.
Note that message processors go through several life-cycle stages, so you must take great care when creating your own implementation. Because existing implementations are tested and proven under high loads, the best practice is to use the existing implementations whenever possible.