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93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
/*
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* Copyright (C) 2018 Codership Oy <info@codership.com>
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*
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* This file is part of wsrep-lib.
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*
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* Wsrep-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wsrep-lib is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef WSREP_DB_STORAGE_ENGINE_HPP
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#define WSREP_DB_STORAGE_ENGINE_HPP
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#include "db_params.hpp"
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#include "wsrep/mutex.hpp"
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#include "wsrep/view.hpp"
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#include "wsrep/transaction.hpp"
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#include <atomic>
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#include <unordered_set>
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#include <random>
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namespace db
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{
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class client;
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class storage_engine
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{
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public:
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storage_engine(const params& params)
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: mutex_()
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, transactions_()
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, alg_freq_(params.alg_freq)
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, bf_aborts_()
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, position_()
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, view_()
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, random_device_()
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, random_engine_(random_device_())
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{ }
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class transaction
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{
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public:
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transaction(storage_engine& se)
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: se_(se)
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, cc_()
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{ }
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~transaction()
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{
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rollback();
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}
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bool active() const { return cc_ != nullptr; }
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void start(client* cc);
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void apply(const wsrep::transaction&);
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void commit(const wsrep::gtid&);
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void rollback();
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db::client* client() { return cc_; }
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transaction(const transaction&) = delete;
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transaction& operator=(const transaction&) = delete;
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private:
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db::storage_engine& se_;
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db::client* cc_;
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};
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void bf_abort_some(const wsrep::transaction& tc);
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long long bf_aborts() const { return bf_aborts_; }
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void store_position(const wsrep::gtid& gtid);
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wsrep::gtid get_position() const;
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void store_view(const wsrep::view& view);
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wsrep::view get_view() const;
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private:
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void validate_position(const wsrep::gtid& gtid) const;
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wsrep::default_mutex mutex_;
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std::unordered_set<db::client*> transactions_;
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size_t alg_freq_;
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std::atomic<long long> bf_aborts_;
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wsrep::gtid position_;
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wsrep::view view_;
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std::random_device random_device_;
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std::default_random_engine random_engine_;
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};
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}
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#endif // WSREP_DB_STORAGE_ENGINE_HPP
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