public void open(WriteConfiguration config) {
   graph = (StandardTitanGraph) TitanFactory.open(config);
   features = graph.getConfiguration().getStoreFeatures();
   tx = graph.newTransaction();
   mgmt = graph.openManagement();
 }
 public void newTx() {
   if (null != tx && tx.isOpen()) tx.commit();
   // tx = graph.newThreadBoundTransaction();
   tx = graph.newTransaction();
 }