private List<EdgeRef> createChennaiToDehli() {
   Vertex sourceVertex = new AbstractVertex("nodes", "14", "CHENNAI");
   Vertex targetVertex = new AbstractVertex("nodes", "10", "DEHLI");
   EdgeRef edge =
       new AbstractEdge(
           EnhancedLinkdTopologyProvider.OSPF_EDGE_NAMESPACE, "7|8", sourceVertex, targetVertex);
   return Arrays.asList(edge);
 }
  private List<EdgeRef> createEdges() {

    Vertex sourceVertex = new AbstractVertex("nodes", "1", "source");
    Vertex targetVertex = new AbstractVertex("nodes", "2", "target");
    EdgeRef edge =
        new AbstractEdge(
            EnhancedLinkdTopologyProvider.OSPF_EDGE_NAMESPACE, "1|2", sourceVertex, targetVertex);
    return Arrays.asList(edge);
  }