Processing requests by modules, handlers

Hello!
Where can i find documentation to writing handlers in Axis2-C?
My problem is to process SOAP envelop in my module and make response to client without calling a service.
Can't find examples except logging module. Logging module is very simple, but i need to write more complex one.
Actually I try to develop Axis2-C module under WS-BaseNotification specification and need to make all processing within module. But documentation is very poor.

Thank you.
Igor