Status TripPlugin::HandleRequest(const datafacade::ContiguousInternalMemoryDataFacadeBase &facade,
const RoutingAlgorithmsInterface &algorithms,
const api::TripParameters ¶meters,
util::json::Object &json_result) const
{
if (!algorithms.HasShortestPathSearch())
{
return Error("NotImplemented",
"Shortest path search is not implemented for the chosen search algorithm.",
json_result);
}
if (!algorithms.HasManyToManySearch())
{
return Error("NotImplemented",
"Many to many search is not implemented for the chosen search algorithm.",
json_result);
}
BOOST_ASSERT(parameters.IsValid());
const auto number_of_locations = parameters.coordinates.size();
std::size_t source_id = INVALID_INDEX;
std::size_t destination_id = INVALID_INDEX;
if (parameters.source == api::TripParameters::SourceType::First)
{
source_id = 0;
}
if (parameters.destination == api::TripParameters::DestinationType::Last)
{
BOOST_ASSERT(number_of_locations > 0);
destination_id = number_of_locations - 1;
}
bool fixed_start = (source_id == 0);
bool fixed_end = (destination_id == number_of_locations - 1);
if (!IsSupportedParameterCombination(fixed_start, fixed_end, parameters.roundtrip))
{
return Error("NotImplemented", "This request is not supported", json_result);
}
// enforce maximum number of locations for performance reasons
if (max_locations_trip > 0 && static_cast<int>(number_of_locations) > max_locations_trip)
{
return Error("TooBig", "Too many trip coordinates", json_result);
}
if (!CheckAllCoordinates(parameters.coordinates))
{
return Error("InvalidValue", "Invalid coordinate value.", json_result);
}
auto phantom_node_pairs = GetPhantomNodes(facade, parameters);
if (phantom_node_pairs.size() != number_of_locations)
{
return Error("NoSegment",
std::string("Could not find a matching segment for coordinate ") +
std::to_string(phantom_node_pairs.size()),
json_result);
}
BOOST_ASSERT(phantom_node_pairs.size() == number_of_locations);
if (fixed_start && fixed_end && (source_id >= parameters.coordinates.size() ||
destination_id >= parameters.coordinates.size()))
{
return Error("InvalidValue", "Invalid source or destination value.", json_result);
}
auto snapped_phantoms = SnapPhantomNodes(phantom_node_pairs);
BOOST_ASSERT(snapped_phantoms.size() == number_of_locations);
// compute the duration table of all phantom nodes
auto result_table = util::DistTableWrapper<EdgeWeight>(
algorithms.ManyToManySearch(snapped_phantoms, {}, {}), number_of_locations);
if (result_table.size() == 0)
{
return Status::Error;
}
const constexpr std::size_t BF_MAX_FEASABLE = 10;
BOOST_ASSERT_MSG(result_table.size() == number_of_locations * number_of_locations,
"Distance Table has wrong size");
if (!IsStronglyConnectedComponent(result_table))
{
return Error("NoTrips", "No trip visiting all destinations possible.", json_result);
}
if (fixed_start && fixed_end)
{
ManipulateTableForFSE(source_id, destination_id, result_table);
}
std::vector<NodeID> trip;
trip.reserve(number_of_locations);
// get an optimized order in which the destinations should be visited
if (number_of_locations < BF_MAX_FEASABLE)
{
trip = trip::BruteForceTrip(number_of_locations, result_table);
}
else
{
trip = trip::FarthestInsertionTrip(number_of_locations, result_table);
}
// rotate result such that roundtrip starts at node with index 0
// thist first if covers scenarios: !fixed_end || fixed_start || (fixed_start && fixed_end)
if (!fixed_end || fixed_start)
{
auto desired_start_index = std::find(std::begin(trip), std::end(trip), 0);
BOOST_ASSERT(desired_start_index != std::end(trip));
std::rotate(std::begin(trip), desired_start_index, std::end(trip));
}
else if (fixed_end && !fixed_start && parameters.roundtrip)
{
auto desired_start_index = std::find(std::begin(trip), std::end(trip), destination_id);
BOOST_ASSERT(desired_start_index != std::end(trip));
std::rotate(std::begin(trip), desired_start_index, std::end(trip));
}
// get the route when visiting all destinations in optimized order
InternalRouteResult route =
ComputeRoute(algorithms, snapped_phantoms, trip, parameters.roundtrip);
// get api response
const std::vector<std::vector<NodeID>> trips = {trip};
const std::vector<InternalRouteResult> routes = {route};
api::TripAPI trip_api{facade, parameters};
trip_api.MakeResponse(trips, routes, snapped_phantoms, json_result);
return Status::Ok;
}
Status TripPlugin::HandleRequest(const api::TripParameters ¶meters,
util::json::Object &json_result)
{
BOOST_ASSERT(parameters.IsValid());
// enforce maximum number of locations for performance reasons
if (max_locations_trip > 0 &&
static_cast<int>(parameters.coordinates.size()) > max_locations_trip)
{
return Error("TooBig", "Too many trip coordinates", json_result);
}
if (!CheckAllCoordinates(parameters.coordinates))
{
return Error("InvalidValue", "Invalid coordinate value.", json_result);
}
auto phantom_node_pairs = GetPhantomNodes(parameters);
if (phantom_node_pairs.size() != parameters.coordinates.size())
{
return Error("NoSegment",
std::string("Could not find a matching segment for coordinate ") +
std::to_string(phantom_node_pairs.size()),
json_result);
}
BOOST_ASSERT(phantom_node_pairs.size() == parameters.coordinates.size());
auto snapped_phantoms = SnapPhantomNodes(phantom_node_pairs);
const auto number_of_locations = snapped_phantoms.size();
// compute the duration table of all phantom nodes
const auto result_table = util::DistTableWrapper<EdgeWeight>(
duration_table(snapped_phantoms, {}, {}), number_of_locations);
if (result_table.size() == 0)
{
return Status::Error;
}
const constexpr std::size_t BF_MAX_FEASABLE = 10;
BOOST_ASSERT_MSG(result_table.size() == number_of_locations * number_of_locations,
"Distance Table has wrong size");
// get scc components
SCC_Component scc = SplitUnaccessibleLocations(number_of_locations, result_table);
std::vector<std::vector<NodeID>> trips;
trips.reserve(scc.GetNumberOfComponents());
// run Trip computation for every SCC
for (std::size_t k = 0; k < scc.GetNumberOfComponents(); ++k)
{
const auto component_size = scc.range[k + 1] - scc.range[k];
BOOST_ASSERT_MSG(component_size > 0, "invalid component size");
std::vector<NodeID> scc_route;
auto route_begin = std::begin(scc.component) + scc.range[k];
auto route_end = std::begin(scc.component) + scc.range[k + 1];
if (component_size > 1)
{
if (component_size < BF_MAX_FEASABLE)
{
scc_route =
trip::BruteForceTrip(route_begin, route_end, number_of_locations, result_table);
}
else
{
scc_route = trip::FarthestInsertionTrip(route_begin, route_end, number_of_locations,
result_table);
}
}
else
{
scc_route = std::vector<NodeID>(route_begin, route_end);
}
trips.push_back(std::move(scc_route));
}
if (trips.empty())
{
return Error("NoTrips", "Cannot find trips", json_result);
}
// compute all round trip routes
std::vector<InternalRouteResult> routes;
routes.reserve(trips.size());
for (const auto &trip : trips)
{
routes.push_back(ComputeRoute(snapped_phantoms, parameters, trip));
}
api::TripAPI trip_api{BasePlugin::facade, parameters};
trip_api.MakeResponse(trips, routes, snapped_phantoms, json_result);
return Status::Ok;
}