class ExampleUtil {

    private static final Logger LOG = Log.logger(ExampleUtil.class);

    private static boolean registered = false;

    public static void registerPlugins() {
        if (registered) {
            return;
        }
        registered = true;

        RegisterUtil.registerCassandra();
        RegisterUtil.registerScyllaDB();
        RegisterUtil.registerHBase();
        RegisterUtil.registerRocksDB();
        RegisterUtil.registerMysql();
        RegisterUtil.registerPalo();
    }

    public static HugeGraph loadGraph() {
        return loadGraph(true, false);
    }

    public static HugeGraph loadGraph(boolean needClear, boolean needProfile) {
        if (needProfile) {
            profile();
        }

        registerPlugins();

        String conf = "hugegraph.properties";
        try {
            String path = ExampleUtil.class.getClassLoader()
                                           .getResource(conf).getPath();
            File file = new File(path);
            if (file.exists() && file.isFile()) {
                conf = path;
            }
        } catch (Exception ignored) {
            LOG.warn("loadGraph warn {} ", ignored);
        }

        HugeGraph graph = HugeFactory.open(conf);

        if (needClear) {
            graph.clearBackend();
        }
        graph.initBackend();
        graph.serverStarted(GlobalMasterInfo.master("server1"));

        return graph;
    }

    public static void profile() {
        try {
            PerfUtil.instance().profilePackage("org.apache.hugegraph");
        } catch (Throwable e) {
            throw new RuntimeException(e);
        }
    }

    public static void waitAllTaskDone(HugeGraph graph) {<FILL_FUNCTION_BODY>}
}

        TaskScheduler scheduler = graph.taskScheduler();
        Iterator<HugeTask<Object>> tasks = scheduler.tasks(null, -1L, null);
        while (tasks.hasNext()) {
            try {
                scheduler.waitUntilTaskCompleted(tasks.next().id(), 20L);
            } catch (TimeoutException e) {
                throw new HugeException("Failed to wait task done", e);
            }
        }
    
<no_super_class>