self.lastStatLog = 0

        self._compileGraphCall = None

        self.notes = {} # song: [notes]

        self.graph.addHandler(self.compileGraph)

        self.update()

        self.codeWatcher = CodeWatcher(

            onChange=lambda: self.graph.addHandler(self.compileGraph))

    def compileGraph(self):

        """rebuild our data from the graph"""

        log.info('compileGraph start')

        g = self.graph

        sharedEffectOutputs = {}

        for song in g.subjects(RDF.type, L9['Song']):

            self.notes[song] = []

            for note in g.objects(song, L9['note']):

                self.notes[song].append(Note(g, note, effecteval, sharedEffectOutputs))

    @stats.update.time()

    def update(self):

        now = time.time()

        self.recentUpdateTimes = self.recentUpdateTimes[-20:] + [now]

        stats.recentFps = len(self.recentUpdateTimes) / (self.recentUpdateTimes[-1] - self.recentUpdateTimes[0] + .0001)

        if now > self.lastStatLog + 10:

            log.info("%.2f fps", stats.recentFps)

            self.lastStatLog = now

        reactor.callLater(1 / self.fps, self.update)