Overridden by the sub-class to handle connection requests.


This class creates a thread-pool using a Windows completion port, and dispatches requests via this port. Sub-classes can generally implement each connection request using blocking reads and writes, and the thread-pool will still provide decent response to the end user.

The sub-class can set a max_workers attribute (default is 20). Note that this generally does *not* mean 20 threads will all be concurrently running, via the magic of Windows completion ports.

There is no default implementation - sub-classes must implement this.