Structure holding the Request and Response objects. It also holds statistical
informations about request processing and provide management informations
about the requests beeing processed.
Each thread uses a Request/Response pair that is recycled on each request.
This object provides a place to collect global low-level statistics - without
having to deal with synchronization ( since each thread will have it's own
RequestProcessorMX ).
TODO: Request notifications will be registered here.
author: Costin Manolache