100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/*------------------------------------------------------------------------------*
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* Architecture & Implementation of DBMS *
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*------------------------------------------------------------------------------*
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* Copyright 2022 Databases and Information Systems Group TU Dortmund *
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* Visit us at *
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* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
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* OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Authors: *
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* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
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* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
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* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
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*------------------------------------------------------------------------------*
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*/
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#pragma once
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#include <cstdint>
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#include <table/table.h>
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#include <unordered_map>
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namespace beedb::statistic
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{
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/**
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* Container for managing statistics regarding tables.
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*/
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class TableStatistic
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{
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public:
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TableStatistic() = default;
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~TableStatistic() = default;
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void cardinality(table::Table &table, const std::uint64_t cardinality)
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{
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this->cardinality(table.id(), cardinality);
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}
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void cardinality(const std::int32_t table_id, const std::uint64_t cardinality)
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{
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_cardinality[table_id] = cardinality;
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}
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[[nodiscard]] std::uint64_t cardinality(table::Table &table) const
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{
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if (_cardinality.find(table.id()) == _cardinality.end())
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{
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return 0u;
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}
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return _cardinality.at(table.id());
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}
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void add_cardinality(table::Table &table, const std::uint64_t cardinality = 1u)
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{
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if (_cardinality.find(table.id()) != _cardinality.end())
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{
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_cardinality[table.id()] += cardinality;
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}
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else
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{
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_cardinality[table.id()] = cardinality;
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}
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}
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[[maybe_unused]] void sub_cardinality(table::Table &table, const std::uint64_t cardinality = 1u)
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{
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if (_cardinality.find(table.id()) != _cardinality.end())
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{
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_cardinality[table.id()] -= cardinality;
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}
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}
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private:
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std::unordered_map<table::Table::id_t, std::uint64_t> _cardinality;
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};
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class SystemStatistics
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{
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public:
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SystemStatistics() = default;
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~SystemStatistics() = default;
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[[nodiscard]] TableStatistic &table_statistics()
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{
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return _table_statistics;
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}
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private:
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TableStatistic _table_statistics;
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};
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} // namespace beedb::statistic
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