Multi-metric or dynamic weight calculation support

[wangyoucao577]

Some important references/discussion

• Multi-metric support Project-OSRM/osrm-backend#4007
• Multiparameter weighting Project-OSRM/osrm-backend#3116
• Is there an easier way to run hundreds different profile(the differences lie at height and weight) on one machine? Project-OSRM/osrm-backend#5530

[wangyoucao577]

osrm-backend/src/storage/storage.cpp

Lines 327 to 334 in d21e5dd

	std::vector<std::pair<bool, boost::filesystem::path>> files = {
	{OPTIONAL, config.GetPath(".osrm.mldgr")},
	{OPTIONAL, config.GetPath(".osrm.cell_metrics")},
	{OPTIONAL, config.GetPath(".osrm.hsgr")},
	{REQUIRED, config.GetPath(".osrm.datasource_names")},
	{REQUIRED, config.GetPath(".osrm.geometry")},
	{REQUIRED, config.GetPath(".osrm.turn_weight_penalties")},
	{REQUIRED, config.GetPath(".osrm.turn_duration_penalties")}};

lists all the metric related files.

osrm-backend/src/storage/storage.cpp

Line 509 in d21e5dd

void Storage::PopulateUpdatableData(const SharedDataIndex &index)

shows operation on these updatable files.

[CodeBear801]

Another place need to pay attention to is here:

osrm-backend/include/engine/datafacade/contiguous_internalmem_datafacade.hpp

Line 176 in 6900e30

{

template <> class ContiguousInternalMemoryAlgorithmDataFacade<MLD> : public AlgorithmDataFacade<MLD>
{

    void InitializeInternalPointers(const storage::SharedDataIndex &index,
                                    const std::string &metric_name,
                                    const std::size_t exclude_index)
    {
        mld_partition = make_partition_view(index, "/mld/multilevelpartition");
        mld_cell_metric =
            make_filtered_cell_metric_view(index, "/mld/metrics/" + metric_name, exclude_index);
        mld_cell_storage = make_cell_storage_view(index, "/mld/cellstorage");
        query_graph = make_multi_level_graph_view(index, "/mld/multilevelgraph");
    }


    void InitializeInternalPointers(const storage::SharedDataIndex &index,
                                    const std::string &metric_name,
                                    const std::size_t exclude_index)
    {
        // TODO: For multi-metric support we need to have separate exclude classes per metric