87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
#ifndef STATEMENT_CACHE_HPP
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#define STATEMENT_CACHE_HPP
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#include "matador/sql/executor.hpp"
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#include "matador/sql/statement.hpp"
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#include "matador/utils/message_bus.hpp"
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#include <list>
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#include <mutex>
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#include <unordered_map>
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namespace matador::sql {
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class connection_pool;
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struct statement_event {
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std::string sql{};
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std::chrono::steady_clock::time_point timestamp{};
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};
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struct statement_accessed_event : statement_event {};
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struct statement_added_event : statement_event {};
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struct statement_evicted_event : statement_event {};
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struct statement_lock_failed_event : statement_event {
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std::chrono::nanoseconds duration{};
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};
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struct statement_lock_acquired_event : statement_event {
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std::chrono::nanoseconds duration{};
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};
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struct statement_execution_event : statement_event {
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std::chrono::nanoseconds duration{};
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};
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struct statement_cache_config {
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size_t max_size;
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};
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class statement_cache final {
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private:
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using list_iterator = std::list<size_t>::iterator;
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struct cache_entry {
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statement stmt;
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std::chrono::steady_clock::time_point last_access;
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list_iterator position;
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};
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public:
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statement_cache(utils::message_bus &bus, connection_pool &pool, size_t max_size = 50);
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statement_cache(const statement_cache &) = delete;
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statement_cache &operator=(const statement_cache &) = delete;
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statement_cache(statement_cache &&) = delete;
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statement_cache &operator=(statement_cache &&) = delete;
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~statement_cache() = default;
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[[nodiscard]] utils::result<statement, utils::error> acquire(const query_context &ctx);
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[[nodiscard]] size_t size() const;
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[[nodiscard]] size_t capacity() const;
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[[nodiscard]] bool empty() const;
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template<class EventType>
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utils::subscription subscribe(std::function<void(const EventType&)> handler) {
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return bus_.subscribe<EventType>(handler);
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}
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[[nodiscard]] connection_pool& pool() const;
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private:
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size_t max_size_{};
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std::list<size_t> usage_list_; // LRU: front = most recent, back = least recent
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std::unordered_map<size_t, cache_entry> cache_map_;
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std::mutex mutex_;
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connection_pool &pool_;
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const sql::dialect &dialect_;
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utils::message_bus &bus_;
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};
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}
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#endif //STATEMENT_CACHE_HPP
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