mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
c863c42ed1
- thread safe cache - parallel commit - multiple optimizations - support of key-value merge operations - improved tests and benchmarks - in-memory version won't read from key value after start - uses vector in-memory table now - use rocksdb::WALRecoveryMode::kTolerateCorruptedTailRecords - do not silently ignore errors during recovery
82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser 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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TON Blockchain Library 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2020 Telegram Systems LLP
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*/
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#pragma once
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#include "td/db/KeyValue.h"
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#include <map>
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namespace td {
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struct Merger {
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virtual ~Merger() = default;
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virtual void merge_value_and_update(std::string &value, Slice update) = 0;
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virtual void merge_update_and_update(std::string &left_update, Slice right_update) = 0;
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};
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class MemoryKeyValue : public KeyValue {
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public:
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MemoryKeyValue() = default;
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MemoryKeyValue(std::shared_ptr<Merger> merger) : merger_(std::move(merger)) {
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}
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Result<GetStatus> get(Slice key, std::string& value) override;
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Status for_each(std::function<Status(Slice, Slice)> f) override;
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Status for_each_in_range(Slice begin, Slice end, std::function<Status(Slice, Slice)> f) override;
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Status set(Slice key, Slice value) override;
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Status merge(Slice key, Slice value) override;
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Status erase(Slice key) override;
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Result<size_t> count(Slice prefix) override;
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Status begin_write_batch() override;
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Status commit_write_batch() override;
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Status abort_write_batch() override;
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Status begin_transaction() override;
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Status commit_transaction() override;
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Status abort_transaction() override;
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std::unique_ptr<KeyValueReader> snapshot() override;
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std::string stats() const override;
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UsageStats get_usage_stats() override {
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return usage_stats_;
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}
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private:
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static constexpr size_t buckets_n = 64;
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struct Bucket {
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std::mutex mutex;
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std::map<std::string, std::string, std::less<>> map;
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};
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struct Unlock {
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void operator()(Bucket* bucket) const {
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bucket->mutex.unlock();
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}
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};
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std::array<Bucket, buckets_n> buckets_{};
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int64 get_count_{0};
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UsageStats usage_stats_{};
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std::shared_ptr<Merger> merger_;
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std::unique_ptr<Bucket, Unlock> lock(Bucket& bucket) {
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bucket.mutex.lock();
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return std::unique_ptr<Bucket, Unlock>(&bucket);
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}
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std::unique_ptr<Bucket, Unlock> lock(td::Slice key);
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};
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} // namespace td
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