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Clarify use of forcing routing steps (#6866)

Browse Source 
The change clarifies the conditions for forcing routing steps and
simplifies the codebase to support it.

- Makes explicity  the search runtime condition for forcing a routing
step. Namely, the node is a source of the forward and reverse searches,
and it's one of the pre-identified nodes that requires a step to
be forced.
- Consolidate the two lists of force nodes into one. Not only is there
no algorithmic value in separating the nodes by geometric direction,
the  improvements to via-routes with u-turns mean atleast one of these
lists will be empty for any search.
- Rename 'force loop' to 'force step'. This moves the code away
from the original CH-specific language for checking for self-loops
in the case where this condition is met. MLD does not have loops.

Additional cucumber tests are added to cover the logic related to
negative search weights and forcing routing steps on via-route
paths.
This commit is contained in:
Michael Bell 2024-05-10 22:00:24 +01:00 committed by GitHub
parent 70969186f6
commit ffc39b8ad2
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12 changed files with 180 additions and 126 deletions
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1
CHANGELOG.md
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@ -46,6 +46,7 @@
- FIXED: Correctly handle compressed traffic signals. [#6724](https://github.com/Project-OSRM/osrm-backend/pull/6724)
- FIXED: Fix bug when searching for maneuver overrides [#6739](https://github.com/Project-OSRM/osrm-backend/pull/6739)
- FIXED: Remove force-loop checks for routes with u-turns [#6858](https://github.com/Project-OSRM/osrm-backend/pull/6858)
- FIXED: Correctly check runtime search conditions for forcing routing steps [#6866](https://github.com/Project-OSRM/osrm-backend/pull/6866)
- Debug tiles:
- FIXED: Ensure speed layer features have unique ids. [#6726](https://github.com/Project-OSRM/osrm-backend/pull/6726)

101
features/testbot/force_step.feature Normal file
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@ -0,0 +1,101 @@
@routing @testbot @via
Feature: Force routing steps
Background:
Given the profile "testbot"
Scenario: Direct routes with waypoints on same edge
Given the node map
"""
1 2
a-------b
| |
d-------c
| |
e-------f
3 4
"""
And the ways
| nodes | oneway |
| ab | no |
| ad | no |
| bc | no |
| cf | no |
| dc | no |
| de | no |
| ef | yes |
When I route I should get
| waypoints | approaches | weight | route |
| 1,2 | | 20 | ab,ab |
| 1,2 | curb curb | 100 | ab,ad,dc,bc,ab |
| 2,1 | | 20 | ab,ab |
| 2,1 | opposite opposite | 100 | ab,bc,dc,ad,ab |
| 3,4 | | 20 | ef,ef |
| 4,3 | | 100 | ef,cf,dc,de,ef |
Scenario: Via routes with waypoints on same edge
Given the node map
"""
1 2
a-------b
| |
d-5-----c
| |
e-------f
3 4
"""
And the ways
| nodes | oneway |
| ab | no |
| ad | no |
| bc | no |
| cf | no |
| dc | no |
| de | no |
| ef | yes |
When I route I should get
| waypoints | approaches | weight | route |
| 5,1,2 | | 59.8 | dc,ad,ab,ab,ab |
| 5,1,2 | unrestricted curb curb | 180.2 | dc,bc,ab,ab,ab,ad,dc,bc,ab |
| 5,2,1 | | 80.2 | dc,bc,ab,ab,ab |
| 5,2,1 | unrestricted opposite opposite | 159.8 | dc,ad,ab,ab,ab,bc,dc,ad,ab |
| 5,3,4 | | 59.8 | dc,de,ef,ef,ef |
| 5,4,3 | | 159.8 | dc,de,ef,ef,ef,cf,dc,de,ef |
Scenario: [U-turns allowed] Via routes with waypoints on same edge
Given the node map
"""
1 2
a-------b
| |
d-5-----c
| |
e-------f
3 4
"""
And the ways
| nodes | oneway |
| ab | no |
| ad | no |
| bc | no |
| cf | no |
| dc | no |
| de | no |
| ef | yes |
And the query options
| continue_straight | false |
When I route I should get
| waypoints | approaches | weight | route |
| 5,1,2 | | 59.8 | dc,ad,ab,ab,ab |
| 5,1,2 | unrestricted curb curb | 180.2 | dc,bc,ab,ab,ab,ad,dc,bc,ab |
| 5,2,1 | | 79.8 | dc,ad,ab,ab,ab,ab |
| 5,2,1 | unrestricted opposite opposite | 159.8 | dc,ad,ab,ab,ab,bc,dc,ad,ab |
| 5,3,4 | | 59.8 | dc,de,ef,ef,ef |
| 5,4,3 | | 159.8 | dc,de,ef,ef,ef,cf,dc,de,ef |

23
include/engine/routing_algorithms/routing_base.hpp
View File

@ -71,24 +71,27 @@ void insertTargetInReverseHeap(Heap &reverse_heap, const PhantomNode &target)
static constexpr bool FORWARD_DIRECTION = true;
static constexpr bool REVERSE_DIRECTION = false;
// Identify nodes in the forward(reverse) search direction that will require loop forcing
// Identify nodes in the forward(reverse) search direction that will require step forcing
// e.g. if source and destination nodes are on the same segment.
std::vector<NodeID> getForwardLoopNodes(const PhantomEndpointCandidates &candidates);
std::vector<NodeID> getForwardLoopNodes(const PhantomCandidatesToTarget &candidates);
std::vector<NodeID> getBackwardLoopNodes(const PhantomEndpointCandidates &candidates);
std::vector<NodeID> getBackwardLoopNodes(const PhantomCandidatesToTarget &candidates);
std::vector<NodeID> getForwardForceNodes(const PhantomEndpointCandidates &candidates);
std::vector<NodeID> getForwardForceNodes(const PhantomCandidatesToTarget &candidates);
std::vector<NodeID> getBackwardForceNodes(const PhantomEndpointCandidates &candidates);
std::vector<NodeID> getBackwardForceNodes(const PhantomCandidatesToTarget &candidates);
// Find the specific phantom node endpoints for a given path from a list of candidates.
PhantomEndpoints endpointsFromCandidates(const PhantomEndpointCandidates &candidates,
const std::vector<NodeID> &path);
template <typename HeapNodeT>
inline bool force_loop(const std::vector<NodeID> &force_nodes, const HeapNodeT &heap_node)
inline bool shouldForceStep(const std::vector<NodeID> &force_nodes,
const HeapNodeT &forward_heap_node,
const HeapNodeT &reverse_heap_node)
{
// if loops are forced, they are so at the source
return !force_nodes.empty() &&
std::find(force_nodes.begin(), force_nodes.end(), heap_node.node) != force_nodes.end() &&
heap_node.data.parent == heap_node.node;
// routing steps are forced when the node is a source of both forward and reverse search heaps.
return forward_heap_node.data.parent == forward_heap_node.node &&
reverse_heap_node.data.parent == reverse_heap_node.node &&
std::find(force_nodes.begin(), force_nodes.end(), forward_heap_node.node) !=
force_nodes.end();
}
template <typename Heap>

28
include/engine/routing_algorithms/routing_base_ch.hpp
View File

@ -112,8 +112,7 @@ void routingStep(const DataFacade<Algorithm> &facade,
NodeID &middle_node_id,
EdgeWeight &upper_bound,
EdgeWeight min_edge_offset,
const std::vector<NodeID> &force_loop_forward_nodes,
const std::vector<NodeID> &force_loop_reverse_nodes)
const std::vector<NodeID> &force_step_nodes)
{
auto heapNode = forward_heap.DeleteMinGetHeapNode();
const auto reverseHeapNode = reverse_heap.GetHeapNodeIfWasInserted(heapNode.node);
@ -123,13 +122,13 @@ void routingStep(const DataFacade<Algorithm> &facade,
const EdgeWeight new_weight = reverseHeapNode->weight + heapNode.weight;
if (new_weight < upper_bound)
{
if (force_loop(force_loop_forward_nodes, heapNode) ||
force_loop(force_loop_reverse_nodes, heapNode) ||
if (shouldForceStep(force_step_nodes, heapNode, reverseHeapNode.get()) ||
// in this case we are looking at a bi-directional way where the source
// and target phantom are on the same edge based node
new_weight < EdgeWeight{0})
{
// check whether there is a loop present at the node
// Before forcing step, check whether there is a loop present at the node.
// We may find a valid weight path by following the loop.
for (const auto edge : facade.GetAdjacentEdgeRange(heapNode.node))
{
const auto &data = facade.GetEdgeData(edge);
@ -421,23 +420,22 @@ void retrievePackedPathFromSingleManyToManyHeap(
// assumes that heaps are already setup correctly.
// ATTENTION: This only works if no additional offset is supplied next to the Phantom Node
// Offsets.
// In case additional offsets are supplied, you might have to force a loop first.
// A forced loop might be necessary, if source and target are on the same segment.
// In case additional offsets are supplied, you might have to force a routing step first.
// A forced step might be necessary, if source and target are on the same segment.
// If this is the case and the offsets of the respective direction are larger for the source
// than the target
// then a force loop is required (e.g. source_phantom.forward_segment_id ==
// then a force step is required (e.g. source_phantom.forward_segment_id ==
// target_phantom.forward_segment_id
// && source_phantom.GetForwardWeightPlusOffset() > target_phantom.GetForwardWeightPlusOffset())
// requires
// a force loop, if the heaps have been initialized with positive offsets.
// a force step, if the heaps have been initialized with positive offsets.
void search(SearchEngineData<Algorithm> &engine_working_data,
const DataFacade<Algorithm> &facade,
SearchEngineData<Algorithm>::QueryHeap &forward_heap,
SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
EdgeWeight &weight,
std::vector<NodeID> &packed_leg,
const std::vector<NodeID> &force_loop_forward_node,
const std::vector<NodeID> &force_loop_reverse_node,
const std::vector<NodeID> &force_step_nodes,
const EdgeWeight duration_upper_bound = INVALID_EDGE_WEIGHT);
template <typename PhantomEndpointT>
@ -447,8 +445,7 @@ void search(SearchEngineData<Algorithm> &engine_working_data,
SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
EdgeWeight &weight,
std::vector<NodeID> &packed_leg,
const std::vector<NodeID> &force_loop_forward_node,
const std::vector<NodeID> &force_loop_reverse_node,
const std::vector<NodeID> &force_step_nodes,
const PhantomEndpointT & /*endpoints*/,
const EdgeWeight duration_upper_bound = INVALID_EDGE_WEIGHT)
{
@ -459,14 +456,13 @@ void search(SearchEngineData<Algorithm> &engine_working_data,
reverse_heap,
weight,
packed_leg,
force_loop_forward_node,
force_loop_reverse_node,
force_step_nodes,
duration_upper_bound);
}
// Requires the heaps for be empty
// If heaps should be adjusted to be initialized outside of this function,
// the addition of force_loop parameters might be required
// the addition of force_step parameters might be required
double getNetworkDistance(SearchEngineData<Algorithm> &engine_working_data,
const DataFacade<ch::Algorithm> &facade,
SearchEngineData<Algorithm>::QueryHeap &forward_heap,

79
include/engine/routing_algorithms/routing_base_mld.hpp
View File

@ -389,8 +389,7 @@ void routingStep(const DataFacade<Algorithm> &facade,
typename SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
NodeID &middle_node,
EdgeWeight &path_upper_bound,
const std::vector<NodeID> &force_loop_forward_nodes,
const std::vector<NodeID> &force_loop_reverse_nodes,
const std::vector<NodeID> &force_step_nodes,
const Args &...args)
{
const auto heapNode = forward_heap.DeleteMinGetHeapNode();
@ -409,11 +408,8 @@ void routingStep(const DataFacade<Algorithm> &facade,
auto reverse_weight = reverseHeapNode->weight;
auto path_weight = weight + reverse_weight;
// MLD uses loops forcing only to prune single node paths in forward and/or
// backward direction (there is no need to force loops in MLD but in CH)
if (!force_loop(force_loop_forward_nodes, heapNode) &&
!force_loop(force_loop_reverse_nodes, heapNode) && (path_weight >= EdgeWeight{0}) &&
(path_weight < path_upper_bound))
if (!shouldForceStep(force_step_nodes, heapNode, reverseHeapNode.get()) &&
(path_weight >= EdgeWeight{0}) && (path_weight < path_upper_bound))
{
middle_node = heapNode.node;
path_upper_bound = path_weight;
@ -438,8 +434,7 @@ UnpackedPath search(SearchEngineData<Algorithm> &engine_working_data,
const DataFacade<Algorithm> &facade,
typename SearchEngineData<Algorithm>::QueryHeap &forward_heap,
typename SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
const std::vector<NodeID> &force_loop_forward_nodes,
const std::vector<NodeID> &force_loop_reverse_nodes,
const std::vector<NodeID> &force_step_nodes,
EdgeWeight weight_upper_bound,
const Args &...args)
{
@ -463,27 +458,15 @@ UnpackedPath search(SearchEngineData<Algorithm> &engine_working_data,
{
if (!forward_heap.Empty())
{
routingStep<FORWARD_DIRECTION>(facade,
forward_heap,
reverse_heap,
middle,
weight,
force_loop_forward_nodes,
force_loop_reverse_nodes,
args...);
routingStep<FORWARD_DIRECTION>(
facade, forward_heap, reverse_heap, middle, weight, force_step_nodes, args...);
if (!forward_heap.Empty())
forward_heap_min = forward_heap.MinKey();
}
if (!reverse_heap.Empty())
{
routingStep<REVERSE_DIRECTION>(facade,
reverse_heap,
forward_heap,
middle,
weight,
force_loop_reverse_nodes,
force_loop_forward_nodes,
args...);
routingStep<REVERSE_DIRECTION>(
facade, reverse_heap, forward_heap, middle, weight, force_step_nodes, args...);
if (!reverse_heap.Empty())
reverse_heap_min = reverse_heap.MinKey();
}
@ -512,9 +495,7 @@ UnpackedPath search(SearchEngineData<Algorithm> &engine_working_data,
for (auto const &packed_edge : packed_path)
{
NodeID source, target;
bool overlay_edge;
std::tie(source, target, overlay_edge) = packed_edge;
auto [source, target, overlay_edge] = packed_edge;
if (!overlay_edge)
{ // a base graph edge
unpacked_nodes.push_back(target);
@ -534,21 +515,14 @@ UnpackedPath search(SearchEngineData<Algorithm> &engine_working_data,
forward_heap.Insert(source, {0}, {source});
reverse_heap.Insert(target, {0}, {target});
// TODO: when structured bindings will be allowed change to
// auto [subpath_weight, subpath_source, subpath_target, subpath] = ...
EdgeWeight subpath_weight;
std::vector<NodeID> subpath_nodes;
std::vector<EdgeID> subpath_edges;
std::tie(subpath_weight, subpath_nodes, subpath_edges) =
search(engine_working_data,
facade,
forward_heap,
reverse_heap,
force_loop_forward_nodes,
force_loop_reverse_nodes,
INVALID_EDGE_WEIGHT,
sublevel,
parent_cell_id);
auto [subpath_weight, subpath_nodes, subpath_edges] = search(engine_working_data,
facade,
forward_heap,
reverse_heap,
force_step_nodes,
INVALID_EDGE_WEIGHT,
sublevel,
parent_cell_id);
BOOST_ASSERT(!subpath_edges.empty());
BOOST_ASSERT(subpath_nodes.size() > 1);
BOOST_ASSERT(subpath_nodes.front() == source);
@ -570,8 +544,7 @@ inline void search(SearchEngineData<Algorithm> &engine_working_data,
typename SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
EdgeWeight &weight,
std::vector<NodeID> &unpacked_nodes,
const std::vector<NodeID> &force_loop_forward_node,
const std::vector<NodeID> &force_loop_reverse_node,
const std::vector<NodeID> &force_step_nodes,
const PhantomEndpointT &endpoints,
const EdgeWeight weight_upper_bound = INVALID_EDGE_WEIGHT)
{
@ -580,8 +553,7 @@ inline void search(SearchEngineData<Algorithm> &engine_working_data,
facade,
forward_heap,
reverse_heap,
force_loop_forward_node,
force_loop_reverse_node,
force_step_nodes,
weight_upper_bound,
endpoints);
}
@ -633,17 +605,8 @@ double getNetworkDistance(SearchEngineData<Algorithm> &engine_working_data,
const PhantomEndpoints endpoints{source_phantom, target_phantom};
insertNodesInHeaps(forward_heap, reverse_heap, endpoints);
EdgeWeight weight = INVALID_EDGE_WEIGHT;
std::vector<NodeID> unpacked_nodes;
std::vector<EdgeID> unpacked_edges;
std::tie(weight, unpacked_nodes, unpacked_edges) = search(engine_working_data,
facade,
forward_heap,
reverse_heap,
{},
{},
weight_upper_bound,
endpoints);
auto [weight, unpacked_nodes, unpacked_edges] = search(
engine_working_data, facade, forward_heap, reverse_heap, {}, weight_upper_bound, endpoints);
if (weight == INVALID_EDGE_WEIGHT)
{

7
include/engine/routing_algorithms/shortest_path_impl.hpp
View File

@ -64,7 +64,6 @@ void searchWithUTurn(SearchEngineData<Algorithm> &engine_working_data,
leg_weight,
leg_packed_path,
{},
{},
candidates);
}
@ -124,8 +123,7 @@ void search(SearchEngineData<Algorithm> &engine_working_data,
reverse_heap,
new_total_weight_to_forward,
leg_packed_path_forward,
getForwardLoopNodes(candidates),
{},
getForwardForceNodes(candidates),
candidates);
}
@ -164,8 +162,7 @@ void search(SearchEngineData<Algorithm> &engine_working_data,
reverse_heap,
new_total_weight_to_reverse,
leg_packed_path_reverse,
{},
getBackwardLoopNodes(candidates),
getBackwardForceNodes(candidates),
candidates);
}
}

8
src/engine/routing_algorithms/alternative_path_ch.cpp
View File

@ -187,7 +187,6 @@ void computeWeightAndSharingOfViaPath(SearchEngineData<Algorithm> &engine_workin
s_v_middle,
upper_bound_s_v_path_weight,
min_edge_offset,
{},
{});
}
// compute path <v,..,t> by reusing backward search from node t
@ -202,7 +201,6 @@ void computeWeightAndSharingOfViaPath(SearchEngineData<Algorithm> &engine_workin
v_t_middle,
upper_bound_of_v_t_path_weight,
min_edge_offset,
{},
{});
}
*real_weight_of_via_path = upper_bound_s_v_path_weight + upper_bound_of_v_t_path_weight;
@ -348,7 +346,6 @@ bool viaNodeCandidatePassesTTest(SearchEngineData<Algorithm> &engine_working_dat
*s_v_middle,
upper_bound_s_v_path_weight,
min_edge_offset,
{},
{});
}
@ -369,7 +366,6 @@ bool viaNodeCandidatePassesTTest(SearchEngineData<Algorithm> &engine_working_dat
*v_t_middle,
upper_bound_of_v_t_path_weight,
min_edge_offset,
{},
{});
}
@ -538,12 +534,12 @@ bool viaNodeCandidatePassesTTest(SearchEngineData<Algorithm> &engine_working_dat
if (!forward_heap3.Empty())
{
routingStep<FORWARD_DIRECTION>(
facade, forward_heap3, reverse_heap3, middle, upper_bound, min_edge_offset, {}, {});
facade, forward_heap3, reverse_heap3, middle, upper_bound, min_edge_offset, {});
}
if (!reverse_heap3.Empty())
{
routingStep<REVERSE_DIRECTION>(
facade, reverse_heap3, forward_heap3, middle, upper_bound, min_edge_offset, {}, {});
facade, reverse_heap3, forward_heap3, middle, upper_bound, min_edge_offset, {});
}
}
return (upper_bound <= t_test_path_weight);

3
src/engine/routing_algorithms/alternative_path_mld.cpp
View File

@ -631,7 +631,6 @@ void unpackPackedPaths(InputIt first,
forward_heap,
reverse_heap,
{},
{},
INVALID_EDGE_WEIGHT,
sublevel,
parent_cell_id);
@ -720,7 +719,6 @@ makeCandidateVias(SearchEngineData<Algorithm> &search_engine_data,
overlap_via,
overlap_weight,
{},
{},
endpoint_candidates);
if (!forward_heap.Empty())
@ -746,7 +744,6 @@ makeCandidateVias(SearchEngineData<Algorithm> &search_engine_data,
overlap_via,
overlap_weight,
{},
{},
endpoint_candidates);
if (!reverse_heap.Empty())

2
src/engine/routing_algorithms/direct_shortest_path.cpp
View File

@ -34,7 +34,6 @@ InternalRouteResult directShortestPathSearch(SearchEngineData<ch::Algorithm> &en
weight,
packed_leg,
{},
{},
endpoint_candidates);
std::vector<NodeID> unpacked_nodes;
@ -81,7 +80,6 @@ InternalRouteResult directShortestPathSearch(SearchEngineData<mld::Algorithm> &e
forward_heap,
reverse_heap,
{},
{},
INVALID_EDGE_WEIGHT,
endpoint_candidates);

28
src/engine/routing_algorithms/routing_base.cpp
View File

@ -3,21 +3,29 @@
namespace osrm::engine::routing_algorithms
{
bool requiresForwardLoop(const PhantomNode &source, const PhantomNode &target)
bool requiresForwardForce(const PhantomNode &source, const PhantomNode &target)
{
// Conditions to force a routing step:
// - Valid source and target.
// - Source and target on same segment.
// - Source is "downstream" of target in the direction of the edge.
return source.IsValidForwardSource() && target.IsValidForwardTarget() &&
source.forward_segment_id.id == target.forward_segment_id.id &&
source.GetForwardWeightPlusOffset() > target.GetForwardWeightPlusOffset();
}
bool requiresBackwardLoop(const PhantomNode &source, const PhantomNode &target)
bool requiresBackwardForce(const PhantomNode &source, const PhantomNode &target)
{
// Conditions to force a routing step:
// - Valid source and target.
// - Source and target on same segment.
// - Source is "downstream" of target in the direction of the edge.
return source.IsValidReverseSource() && target.IsValidReverseTarget() &&
source.reverse_segment_id.id == target.reverse_segment_id.id &&
source.GetReverseWeightPlusOffset() > target.GetReverseWeightPlusOffset();
}
std::vector<NodeID> getForwardLoopNodes(const PhantomEndpointCandidates &endpoint_candidates)
std::vector<NodeID> getForwardForceNodes(const PhantomEndpointCandidates &endpoint_candidates)
{
std::vector<NodeID> res;
for (const auto &source_phantom : endpoint_candidates.source_phantoms)
@ -26,7 +34,7 @@ std::vector<NodeID> getForwardLoopNodes(const PhantomEndpointCandidates &endpoin
std::any_of(endpoint_candidates.target_phantoms.begin(),
endpoint_candidates.target_phantoms.end(),
[&](const auto &target_phantom)
{ return requiresForwardLoop(source_phantom, target_phantom); });
{ return requiresForwardForce(source_phantom, target_phantom); });
if (requires_loop)
{
res.push_back(source_phantom.forward_segment_id.id);
@ -35,12 +43,12 @@ std::vector<NodeID> getForwardLoopNodes(const PhantomEndpointCandidates &endpoin
return res;
}
std::vector<NodeID> getForwardLoopNodes(const PhantomCandidatesToTarget &endpoint_candidates)
std::vector<NodeID> getForwardForceNodes(const PhantomCandidatesToTarget &endpoint_candidates)
{
std::vector<NodeID> res;
for (const auto &source_phantom : endpoint_candidates.source_phantoms)
{
if (requiresForwardLoop(source_phantom, endpoint_candidates.target_phantom))
if (requiresForwardForce(source_phantom, endpoint_candidates.target_phantom))
{
res.push_back(source_phantom.forward_segment_id.id);
}
@ -48,7 +56,7 @@ std::vector<NodeID> getForwardLoopNodes(const PhantomCandidatesToTarget &endpoin
return res;
}
std::vector<NodeID> getBackwardLoopNodes(const PhantomEndpointCandidates &endpoint_candidates)
std::vector<NodeID> getBackwardForceNodes(const PhantomEndpointCandidates &endpoint_candidates)
{
std::vector<NodeID> res;
for (const auto &source_phantom : endpoint_candidates.source_phantoms)
@ -57,7 +65,7 @@ std::vector<NodeID> getBackwardLoopNodes(const PhantomEndpointCandidates &endpoi
std::any_of(endpoint_candidates.target_phantoms.begin(),
endpoint_candidates.target_phantoms.end(),
[&](const auto &target_phantom)
{ return requiresBackwardLoop(source_phantom, target_phantom); });
{ return requiresBackwardForce(source_phantom, target_phantom); });
if (requires_loop)
{
res.push_back(source_phantom.reverse_segment_id.id);
@ -66,12 +74,12 @@ std::vector<NodeID> getBackwardLoopNodes(const PhantomEndpointCandidates &endpoi
return res;
}
std::vector<NodeID> getBackwardLoopNodes(const PhantomCandidatesToTarget &endpoint_candidates)
std::vector<NodeID> getBackwardForceNodes(const PhantomCandidatesToTarget &endpoint_candidates)
{
std::vector<NodeID> res;
for (const auto &source_phantom : endpoint_candidates.source_phantoms)
{
if (requiresBackwardLoop(source_phantom, endpoint_candidates.target_phantom))
if (requiresBackwardForce(source_phantom, endpoint_candidates.target_phantom))
{
res.push_back(source_phantom.reverse_segment_id.id);
}

20
src/engine/routing_algorithms/routing_base_ch.cpp
View File

@ -73,23 +73,22 @@ void retrievePackedPathFromSingleManyToManyHeap(
// assumes that heaps are already setup correctly.
// ATTENTION: This only works if no additional offset is supplied next to the Phantom Node
// Offsets.
// In case additional offsets are supplied, you might have to force a loop first.
// A forced loop might be necessary, if source and target are on the same segment.
// In case additional offsets are supplied, you might have to force a routing step first.
// A forced step might be necessary, if source and target are on the same segment.
// If this is the case and the offsets of the respective direction are larger for the source
// than the target
// then a force loop is required (e.g. source_phantom.forward_segment_id ==
// then a force step is required (e.g. source_phantom.forward_segment_id ==
// target_phantom.forward_segment_id
// && source_phantom.GetForwardWeightPlusOffset() > target_phantom.GetForwardWeightPlusOffset())
// requires
// a force loop, if the heaps have been initialized with positive offsets.
// a force step, if the heaps have been initialized with positive offsets.
void search(SearchEngineData<Algorithm> & /*engine_working_data*/,
const DataFacade<Algorithm> &facade,
SearchEngineData<Algorithm>::QueryHeap &forward_heap,
SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
EdgeWeight &weight,
std::vector<NodeID> &packed_leg,
const std::vector<NodeID> &force_loop_forward_nodes,
const std::vector<NodeID> &force_loop_reverse_nodes,
const std::vector<NodeID> &force_step_nodes,
const EdgeWeight weight_upper_bound)
{
if (forward_heap.Empty() || reverse_heap.Empty())
@ -118,8 +117,7 @@ void search(SearchEngineData<Algorithm> & /*engine_working_data*/,
middle,
weight,
min_edge_offset,
force_loop_forward_nodes,
force_loop_reverse_nodes);
force_step_nodes);
}
if (!reverse_heap.Empty())
{
@ -129,8 +127,7 @@ void search(SearchEngineData<Algorithm> & /*engine_working_data*/,
middle,
weight,
min_edge_offset,
force_loop_reverse_nodes,
force_loop_forward_nodes);
force_step_nodes);
}
}
@ -159,7 +156,7 @@ void search(SearchEngineData<Algorithm> & /*engine_working_data*/,
// Requires the heaps for be empty
// If heaps should be adjusted to be initialized outside of this function,
// the addition of force_loop parameters might be required
// the addition of force_step parameters might be required
double getNetworkDistance(SearchEngineData<Algorithm> &engine_working_data,
const DataFacade<Algorithm> &facade,
SearchEngineData<Algorithm>::QueryHeap &forward_heap,
@ -183,7 +180,6 @@ double getNetworkDistance(SearchEngineData<Algorithm> &engine_working_data,
weight,
packed_path,
{},
{},
endpoints,
weight_upper_bound);

6
unit_tests/engine/offline_facade.cpp
View File

@ -334,8 +334,7 @@ inline void search(SearchEngineData<Algorithm> &engine_working_data,
typename SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
EdgeWeight &weight,
std::vector<NodeID> &packed_leg,
const std::vector<NodeID> &forward_loop_nodes,
const std::vector<NodeID> &reverse_loop_nodes,
const std::vector<NodeID> &loop_nodes,
const PhantomT &endpoints,
const EdgeWeight weight_upper_bound = INVALID_EDGE_WEIGHT)
{
@ -345,8 +344,7 @@ inline void search(SearchEngineData<Algorithm> &engine_working_data,
reverse_heap,
weight,
packed_leg,
forward_loop_nodes,
reverse_loop_nodes,
loop_nodes,
endpoints,
weight_upper_bound);
}