A factory for TCPServerConnection objects.

The TCPServer class uses a TCPServerConnectionFactory to create a connection object for each new connection it accepts.

Subclasses must override the createConnection() method, which can refuse connections by returning nullptr. Some examples when an implementation may refuse new connections:

- number of connections exceeded a limit - a connection from unwanted client attempted - too many connection attempts in a short timespan - etc.

The TCPServerConnectionFactoryImpl template class can be used to automatically instantiate a TCPServerConnectionFactory for a given subclass of TCPServerConnection.

Creates the TCPServerConnectionFactory.

Destroys the TCPServerConnectionFactory.

Creates an instance of a subclass of TCPServerConnection, using the given StreamSocket. This function is allowed to return nullptr, in which case an accepted socket will be destroyed by the TCPServerDispatcher.

Returns true if the factory was stopped, false otherwise.

Stops the factory. Normally, this function is called by TCPServerDispatcher to indicate that the server is shutting down; the expected implementation behavior after this call is to return nullptr on all subsequent connection creation attempts.