docs: def createPort(self, portNumber, ssl, certPath, factory, interface=u''):
          """
          Create a new listening port.
  
          @type portNumber: C{int}
          @param portNumber: Port number on which to listen.
  
          @type ssl: C{bool}
          @param ssl: Indicates whether this should be an SSL port or not.
  
          @type certPath: C{str}
          @param ssl: If C{ssl} is true, a path to a certificate file somewhere
          within the site store's files directory.  Ignored otherwise.
  
          @param factory: L{Item} which provides L{IProtocolFactoryFactory} which
          will be used to get a protocol factory to associate with this port.
  
          @return: C{None}
          """
          store = self.store.parent
          if ssl:
              port = SSLPort(store=store, portNumber=portNumber,
                             certificatePath=FilePath(certPath), factory=factory,
                             interface=interface)
          else:
              port = TCPPort(store=store, portNumber=portNumber, factory=factory,
                             interface=interface)
          installOn(port, store)