    class SessionFileStore(SessionStore):

        ## Init ##
        def __init__(self, app):

        ## Access ##
        def __len__(self):
        def __getitem__(self, key):
        def __setitem__(self, key, item):
        def __delitem__(self, key):
        def has_key(self, key):
        def keys(self):
        def clear(self):

        ## Application support ##
        def storeSession(self, session):
        def storeAllSessions(self):

        ## Self utility ##
        def filenameForKey(self, key):