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69 lines
2.8 KiB
C++
69 lines
2.8 KiB
C++
#pragma once
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#include <Access/IAccessStorage.h>
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#include <base/defines.h>
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#include <list>
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#include <memory>
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#include <mutex>
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#include <unordered_map>
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namespace DB
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{
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class AccessChangesNotifier;
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/// Implementation of IAccessStorage which keeps all data in memory.
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class MemoryAccessStorage : public IAccessStorage
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{
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public:
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static constexpr char STORAGE_TYPE[] = "memory";
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explicit MemoryAccessStorage(const String & storage_name_, AccessChangesNotifier & changes_notifier_, bool allow_backup_);
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const char * getStorageType() const override { return STORAGE_TYPE; }
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/// Inserts an entity with a specified ID.
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/// If `replace_if_exists == true` it can replace an existing entry with such ID and also remove an existing entry
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/// with such name & type.
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bool insertWithID(const UUID & id, const AccessEntityPtr & new_entity, bool replace_if_exists, bool throw_if_exists);
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/// Removes all entities except a specified list.
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void removeAllExcept(const std::vector<UUID> & ids_to_keep);
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/// Sets all entities at once.
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void setAll(const std::vector<AccessEntityPtr> & all_entities);
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void setAll(const std::vector<std::pair<UUID, AccessEntityPtr>> & all_entities);
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bool exists(const UUID & id) const override;
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bool isBackupAllowed() const override { return backup_allowed; }
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void restoreFromBackup(RestorerFromBackup & restorer) override;
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private:
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std::optional<UUID> findImpl(AccessEntityType type, const String & name) const override;
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std::vector<UUID> findAllImpl(AccessEntityType type) const override;
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AccessEntityPtr readImpl(const UUID & id, bool throw_if_not_exists) const override;
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std::optional<UUID> insertImpl(const AccessEntityPtr & entity, bool replace_if_exists, bool throw_if_exists) override;
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bool removeImpl(const UUID & id, bool throw_if_not_exists) override;
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bool updateImpl(const UUID & id, const UpdateFunc & update_func, bool throw_if_not_exists) override;
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bool insertNoLock(const UUID & id, const AccessEntityPtr & entity, bool replace_if_exists, bool throw_if_exists) TSA_REQUIRES(mutex);
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bool removeNoLock(const UUID & id, bool throw_if_not_exists) TSA_REQUIRES(mutex);
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bool updateNoLock(const UUID & id, const UpdateFunc & update_func, bool throw_if_not_exists) TSA_REQUIRES(mutex);
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void removeAllExceptNoLock(const std::vector<UUID> & ids_to_keep) TSA_REQUIRES(mutex);
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struct Entry
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{
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UUID id;
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AccessEntityPtr entity;
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};
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mutable std::mutex mutex;
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std::unordered_map<UUID, Entry> entries_by_id TSA_GUARDED_BY(mutex); /// We want to search entries both by ID and by the pair of name and type.
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std::unordered_map<String, Entry *> entries_by_name_and_type[static_cast<size_t>(AccessEntityType::MAX)] TSA_GUARDED_BY(mutex);
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AccessChangesNotifier & changes_notifier;
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const bool backup_allowed = false;
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};
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}
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