return g

    def addClient(self, newClient):

        [self.clients.remove(c)

         for c in self.clients if c.updateUri == newClient.updateUri]

        log.info("new client %r" % newClient)

        sendGraphToClient(self.graph, newClient)

        self.clients.append(newClient)

        self.sendClientsToAllLivePages()

    def sendClientsToAllLivePages(self):

        sendToLiveClients({"clients":[

            dict(updateUri=c.updateUri, label=repr(c))

            for c in self.clients]})

class GraphResource(PrettyErrorHandler, cyclone.web.RequestHandler):

    def get(self):

        accept = self.request.headers.get('accept', '')

        format = 'n3'

        if accept == 'text/plain':

            format = 'nt'

        elif accept == 'application/n-quads':

            format = 'nquads'

        self.write(self.settings.db.graph.serialize(format=format))

class Patches(PrettyErrorHandler, cyclone.web.RequestHandler):

    def __init__(self, *args, **kw):

        cyclone.web.RequestHandler.__init__(self, *args, **kw)

        p = makePatchEndpointPutMethod(self.settings.db.patch)

        self.put = lambda: p(self)

    def get(self):

        pass

class GraphClients(PrettyErrorHandler, cyclone.web.RequestHandler):

    def get(self):

        pass

    def post(self):

        upd = self.get_argument("clientUpdate")

        try:

            self.settings.db.addClient(Client(upd, self.get_argument("label")))

        except:

            import traceback

            traceback.print_exc()

            raise