54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
#ifndef QUERY_BACKEND_PROVIDER_HPP
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#define QUERY_BACKEND_PROVIDER_HPP
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#include "matador/utils/library.hpp"
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#include <memory>
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#include <string>
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#include <unordered_map>
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namespace matador::sql {
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class connection_impl;
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struct connection_info;
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class dialect;
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class backend_provider
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{
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private:
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backend_provider();
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public:
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static backend_provider& instance();
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connection_impl* create_connection(const std::string &connection_type, const connection_info &info);
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void destroy_connection(const std::string &connection_type, connection_impl *c);
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const dialect& connection_dialect(const std::string &connection_type);
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private:
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struct backend_context {
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backend_context(const std::string &connection_type,
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const std::string &backends_path);
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backend_context(const backend_context&) = delete;
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backend_context& operator=(const backend_context&) = delete;
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backend_context(backend_context&&) noexcept = default;
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backend_context& operator=(backend_context&&) noexcept = default;
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~backend_context();
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typedef connection_impl*(*create_func)(const connection_info&);
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typedef void (*destroy_func)(connection_impl*);
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typedef const dialect*(*dialect_func)();
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create_func create_connection{};
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destroy_func destroy_connection{};
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dialect_func get_dialect{};
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utils::library lib;
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};
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private:
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using backends_t = std::unordered_map<std::string, std::unique_ptr<backend_context>>;
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backends_t backends_;
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std::string backends_path_;
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};
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}
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#endif //QUERY_BACKEND_PROVIDER_HPP
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