89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
#ifndef OSRM_STORAGE_SHARED_DATA_INDEX_HPP
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#define OSRM_STORAGE_SHARED_DATA_INDEX_HPP
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#include "storage/shared_datatype.hpp"
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#include <boost/function_output_iterator.hpp>
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#include <unordered_map>
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namespace osrm
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{
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namespace storage
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{
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// This class wraps one or more shared memory regions with the associated data layout
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// to abstract away in which region a block of memory is stored.
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class SharedDataIndex
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{
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public:
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struct AllocatedRegion
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{
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char *memory_ptr;
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DataLayout layout;
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};
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SharedDataIndex() = default;
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SharedDataIndex(std::vector<AllocatedRegion> regions_) : regions(std::move(regions_))
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{
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// Build mapping from block name to region
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for (auto index : util::irange<std::uint32_t>(0, regions.size()))
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{
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regions[index].layout.List("",
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boost::make_function_output_iterator([&](const auto &name) {
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block_to_region[name] = index;
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}));
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}
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}
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template <typename OutIter> void List(const std::string &name_prefix, OutIter out) const
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{
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for (const auto ®ion : regions)
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{
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region.layout.List(name_prefix, out);
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}
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}
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template <typename T> auto GetBlockPtr(const std::string &name) const
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{
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const auto ®ion = GetBlockRegion(name);
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return region.layout.GetBlockPtr<T>(region.memory_ptr, name);
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}
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template <typename T> auto GetBlockPtr(const std::string &name)
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{
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const auto ®ion = GetBlockRegion(name);
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return region.layout.GetBlockPtr<T>(region.memory_ptr, name);
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}
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std::size_t GetBlockEntries(const std::string &name) const
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{
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const auto ®ion = GetBlockRegion(name);
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return region.layout.GetBlockEntries(name);
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}
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std::size_t GetBlockSize(const std::string &name) const
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{
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const auto ®ion = GetBlockRegion(name);
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return region.layout.GetBlockSize(name);
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}
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private:
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const AllocatedRegion &GetBlockRegion(const std::string &name) const
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{
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const auto index_iter = block_to_region.find(name);
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if (index_iter == block_to_region.end())
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{
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throw util::exception("data block " + name + " not found " + SOURCE_REF);
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}
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return regions[index_iter->second];
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}
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std::vector<AllocatedRegion> regions;
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std::unordered_map<std::string, std::uint32_t> block_to_region;
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};
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}
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}
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#endif
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