- virtual void getGraph(xbt_graph_t graph, xbt_dict_t nodes, xbt_dict_t edges)=0;
- static void getRouteRecursive(routing::NetCard *src, routing::NetCard *dst, /* OUT */ std::vector<surf::Link*> * links, double *latency);
+ /**
+ * @brief Probe the routing path between two points
+ *
+ * The networking model uses this function when creating a communication
+ * to retrieve both the list of links that the create communication will use,
+ * and the summed latency that these links represent.
+ *
+ * The network could recompute the latency by itself from the list, but it would
+ * require an additional link set traversal. This operation being on the critical
+ * path of SimGrid, the routing computes the latency in behalf of the network.
+ *
+ * Things are rather complex here because we have to find the path from ASes to ASes, and within each.
+ * In addition, the different ASes may use differing routing models.
+ * Some ASes may be routed in full, others may have only some connection information and use a shortest path on top
+ * of that, and so on.
+ * Some ASes may even not have any predefined links and use only coordinate information to compute the latency.
+ *
+ * So, the path is constructed recursively, with each traversed AS adding its information to the set.
+ * The algorithm for that is explained in http://hal.inria.fr/hal-00650233/
+ *
+ * @param src Initial point of the routing path
+ * @param dst Final point of the routing path
+ * @param into Container into which the traversed links should be pushed
+ * @param latency Accumulator in which the latencies should be added (caller must set it to 0)
+ */
+ protected:
+ virtual void getLocalRoute(NetCard * src, NetCard * dst, sg_platf_route_cbarg_t into, double* latency) = 0;
+ /** @brief retrieves the list of all routes of size 1 (of type src x dst x Link) */
+ /* returns whether we found a bypass path */
+ bool getBypassRoute(routing::NetCard * src, routing::NetCard * dst,
+ /* OUT */ std::vector<surf::Link*> * links, double* latency);