void EdgeBasedGraphFactory::GetEdgeBasedEdges(
    util::DeallocatingVector<EdgeBasedEdge> &output_edge_list)
{
    BOOST_ASSERT_MSG(0 == output_edge_list.size(), "Vector is not empty");
    using std::swap; // Koenig swap
    swap(m_edge_based_edge_list, output_edge_list);
}
示例#2
0
std::size_t
Contractor::WriteContractedGraph(unsigned max_node_id,
                                 const util::DeallocatingVector<QueryEdge> &contracted_edge_list)
{
    // Sorting contracted edges in a way that the static query graph can read some in in-place.
    tbb::parallel_sort(contracted_edge_list.begin(), contracted_edge_list.end());
    const unsigned contracted_edge_count = contracted_edge_list.size();
    util::SimpleLogger().Write() << "Serializing compacted graph of " << contracted_edge_count
                                 << " edges";

    const util::FingerPrint fingerprint = util::FingerPrint::GetValid();
    boost::filesystem::ofstream hsgr_output_stream(config.graph_output_path, std::ios::binary);
    hsgr_output_stream.write((char *)&fingerprint, sizeof(util::FingerPrint));
    const NodeID max_used_node_id = [&contracted_edge_list] {
        NodeID tmp_max = 0;
        for (const QueryEdge &edge : contracted_edge_list)
        {
            BOOST_ASSERT(SPECIAL_NODEID != edge.source);
            BOOST_ASSERT(SPECIAL_NODEID != edge.target);
            tmp_max = std::max(tmp_max, edge.source);
            tmp_max = std::max(tmp_max, edge.target);
        }
        return tmp_max;
    }();

    util::SimpleLogger().Write(logDEBUG) << "input graph has " << (max_node_id + 1) << " nodes";
    util::SimpleLogger().Write(logDEBUG) << "contracted graph has " << (max_used_node_id + 1)
                                         << " nodes";

    std::vector<util::StaticGraph<EdgeData>::NodeArrayEntry> node_array;
    // make sure we have at least one sentinel
    node_array.resize(max_node_id + 2);

    util::SimpleLogger().Write() << "Building node array";
    util::StaticGraph<EdgeData>::EdgeIterator edge = 0;
    util::StaticGraph<EdgeData>::EdgeIterator position = 0;
    util::StaticGraph<EdgeData>::EdgeIterator last_edge;

    // initializing 'first_edge'-field of nodes:
    for (const auto node : util::irange(0u, max_used_node_id + 1))
    {
        last_edge = edge;
        while ((edge < contracted_edge_count) && (contracted_edge_list[edge].source == node))
        {
            ++edge;
        }
        node_array[node].first_edge = position; //=edge
        position += edge - last_edge;           // remove
    }

    for (const auto sentinel_counter :
         util::irange<unsigned>(max_used_node_id + 1, node_array.size()))
    {
        // sentinel element, guarded against underflow
        node_array[sentinel_counter].first_edge = contracted_edge_count;
    }

    util::SimpleLogger().Write() << "Serializing node array";

    RangebasedCRC32 crc32_calculator;
    const unsigned edges_crc32 = crc32_calculator(contracted_edge_list);
    util::SimpleLogger().Write() << "Writing CRC32: " << edges_crc32;

    const unsigned node_array_size = node_array.size();
    // serialize crc32, aka checksum
    hsgr_output_stream.write((char *)&edges_crc32, sizeof(unsigned));
    // serialize number of nodes
    hsgr_output_stream.write((char *)&node_array_size, sizeof(unsigned));
    // serialize number of edges
    hsgr_output_stream.write((char *)&contracted_edge_count, sizeof(unsigned));
    // serialize all nodes
    if (node_array_size > 0)
    {
        hsgr_output_stream.write((char *)&node_array[0],
                                 sizeof(util::StaticGraph<EdgeData>::NodeArrayEntry) *
                                     node_array_size);
    }

    // serialize all edges
    util::SimpleLogger().Write() << "Building edge array";
    std::size_t number_of_used_edges = 0;

    util::StaticGraph<EdgeData>::EdgeArrayEntry current_edge;
    for (const auto edge : util::irange<std::size_t>(0UL, contracted_edge_list.size()))
    {
        // some self-loops are required for oneway handling. Need to assertthat we only keep these
        // (TODO)
        // no eigen loops
        // BOOST_ASSERT(contracted_edge_list[edge].source != contracted_edge_list[edge].target ||
        // node_represents_oneway[contracted_edge_list[edge].source]);
        current_edge.target = contracted_edge_list[edge].target;
        current_edge.data = contracted_edge_list[edge].data;

        // every target needs to be valid
        BOOST_ASSERT(current_edge.target <= max_used_node_id);
#ifndef NDEBUG
        if (current_edge.data.distance <= 0)
        {
            util::SimpleLogger().Write(logWARNING)
                << "Edge: " << edge << ",source: " << contracted_edge_list[edge].source
                << ", target: " << contracted_edge_list[edge].target
                << ", dist: " << current_edge.data.distance;

            util::SimpleLogger().Write(logWARNING) << "Failed at adjacency list of node "
                                                   << contracted_edge_list[edge].source << "/"
                                                   << node_array.size() - 1;
            return 1;
        }
#endif
        hsgr_output_stream.write((char *)&current_edge,
                                 sizeof(util::StaticGraph<EdgeData>::EdgeArrayEntry));

        ++number_of_used_edges;
    }

    return number_of_used_edges;
}