Split MLD many-to-many method

2017-09-20 20:17:04 +02:00
parent 454487dd41
commit 2715e5758b
6 changed files with 139 additions and 26 deletions
@@ -0,0 +1,56 @@
+#include "engine/routing_algorithms.hpp"
+
+namespace osrm
+{
+namespace engine
+{
+
+template <typename Algorithm>
+std::vector<EdgeDuration>
+RoutingAlgorithms<Algorithm>::ManyToManySearch(const std::vector<PhantomNode> &phantom_nodes,
+                                               const std::vector<std::size_t> &source_indices,
+                                               const std::vector<std::size_t> &target_indices) const
+{
+    return routing_algorithms::manyToManySearch(
+        heaps, *facade, phantom_nodes, source_indices, target_indices);
+}
+
+template std::vector<EdgeDuration>
+RoutingAlgorithms<routing_algorithms::ch::Algorithm>::ManyToManySearch(
+    const std::vector<PhantomNode> &phantom_nodes,
+    const std::vector<std::size_t> &source_indices,
+    const std::vector<std::size_t> &target_indices) const;
+
+template std::vector<EdgeDuration>
+RoutingAlgorithms<routing_algorithms::corech::Algorithm>::ManyToManySearch(
+    const std::vector<PhantomNode> &phantom_nodes,
+    const std::vector<std::size_t> &source_indices,
+    const std::vector<std::size_t> &target_indices) const;
+
+// One-to-many and many-to-one can be handled with MLD separately from many-to-many search.
+// One-to-many (many-to-one) search is a unidirectional forward (backward) Dijkstra search
+// with the candidate node level min(GetQueryLevel(phantom_node, phantom_nodes, node)
+template <>
+std::vector<EdgeDuration> RoutingAlgorithms<routing_algorithms::mld::Algorithm>::ManyToManySearch(
+    const std::vector<PhantomNode> &phantom_nodes,
+    const std::vector<std::size_t> &source_indices,
+    const std::vector<std::size_t> &target_indices) const
+{
+    if (source_indices.size() == 1)
+    { // TODO: check if target_indices.size() == 1 and do a bi-directional search
+        return routing_algorithms::mld::oneToManySearch<routing_algorithms::FORWARD_DIRECTION>(
+            heaps, *facade, phantom_nodes, source_indices.front(), target_indices);
+    }
+
+    if (target_indices.size() == 1)
+    {
+        return routing_algorithms::mld::oneToManySearch<routing_algorithms::REVERSE_DIRECTION>(
+            heaps, *facade, phantom_nodes, target_indices.front(), source_indices);
+    }
+
+    return routing_algorithms::manyToManySearch(
+        heaps, *facade, phantom_nodes, source_indices, target_indices);
+}
+
+} // namespace engine
+} // namespace osrm
@@ -322,11 +322,11 @@ void backwardRoutingStep(const DataFacade<Algorithm> &facade,
 }

 template <typename Algorithm>
-std::vector<EdgeWeight> manyToManySearch(SearchEngineData<Algorithm> &engine_working_data,
-                                         const DataFacade<Algorithm> &facade,
-                                         const std::vector<PhantomNode> &phantom_nodes,
-                                         std::vector<std::size_t> source_indices,
-                                         std::vector<std::size_t> target_indices)
+std::vector<EdgeDuration> manyToManySearch(SearchEngineData<Algorithm> &engine_working_data,
+                                           const DataFacade<Algorithm> &facade,
+                                           const std::vector<PhantomNode> &phantom_nodes,
+                                           std::vector<std::size_t> source_indices,
+                                           std::vector<std::size_t> target_indices)
 {
    if (source_indices.empty())
    {
@@ -415,20 +415,57 @@ std::vector<EdgeWeight> manyToManySearch(SearchEngineData<Algorithm> &engine_wor
    return durations_table;
 }

-template std::vector<EdgeWeight>
+template std::vector<EdgeDuration>
 manyToManySearch(SearchEngineData<ch::Algorithm> &engine_working_data,
                 const DataFacade<ch::Algorithm> &facade,
                 const std::vector<PhantomNode> &phantom_nodes,
                 std::vector<std::size_t> source_indices,
                 std::vector<std::size_t> target_indices);

-template std::vector<EdgeWeight>
+template std::vector<EdgeDuration>
 manyToManySearch(SearchEngineData<mld::Algorithm> &engine_working_data,
                 const DataFacade<mld::Algorithm> &facade,
                 const std::vector<PhantomNode> &phantom_nodes,
                 std::vector<std::size_t> source_indices,
                 std::vector<std::size_t> target_indices);

+namespace mld
+{
+
+template <bool DIRECTION>
+std::vector<EdgeDuration> oneToManySearch(SearchEngineData<Algorithm> &engine_working_data,
+                                          const DataFacade<Algorithm> &facade,
+                                          const std::vector<PhantomNode> &phantom_nodes,
+                                          std::size_t phantom_index,
+                                          std::vector<std::size_t> phantom_indices)
+{
+    if (phantom_indices.empty())
+    {
+        phantom_indices.resize(phantom_nodes.size());
+        std::iota(phantom_indices.begin(), phantom_indices.end(), 0);
+    }
+
+    std::vector<EdgeWeight> weights(phantom_nodes.size(), INVALID_EDGE_WEIGHT);
+    std::vector<EdgeDuration> durations(phantom_nodes.size(), MAXIMAL_EDGE_DURATION);
+
+    return durations;
+}
+
+template std::vector<EdgeDuration>
+oneToManySearch<FORWARD_DIRECTION>(SearchEngineData<Algorithm> &engine_working_data,
+                                   const DataFacade<Algorithm> &facade,
+                                   const std::vector<PhantomNode> &phantom_nodes,
+                                   std::size_t phantom_index,
+                                   std::vector<std::size_t> phantom_indices);
+
+template std::vector<EdgeDuration>
+oneToManySearch<REVERSE_DIRECTION>(SearchEngineData<Algorithm> &engine_working_data,
+                                   const DataFacade<Algorithm> &facade,
+                                   const std::vector<PhantomNode> &phantom_nodes,
+                                   std::size_t phantom_index,
+                                   std::vector<std::size_t> phantom_indices);
+} // mld
+
 } // namespace routing_algorithms
 } // namespace engine
 } // namespace osrm