def from_connection(cls, connection):
        """
        Given a connected Connection object, return an initialized and
        connected instance of an API Interface matching the name of
        this class.

        @param connection: initialized Connection object.

        """
        facade_name = cls.__name__
        if not facade_name.endswith('Facade'):
           raise TypeError('Unexpected class name: {}'.format(facade_name))
        facade_name = facade_name[:-len('Facade')]
        version = connection.facades.get(facade_name)
        if version is None:
            raise Exception('No facade {} in facades {}'.format(facade_name,
                                                                connection.facades))

        c = lookup_facade(cls.__name__, version)
        c = c()
        c.connect(connection)

        return c
Given a connected Connection object, return an initialized and
        connected instance of an API Interface matching the name of
        this class.

        @param connection: initialized Connection object.