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53 lines
2.1 KiB
C++
53 lines
2.1 KiB
C++
#pragma once
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#include <Access/IAccessStorage.h>
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#include <Common/LRUCache.h>
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#include <mutex>
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namespace DB
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{
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/// Implementation of IAccessStorage which contains multiple nested storages.
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class MultipleAccessStorage : public IAccessStorage
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{
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public:
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using Storage = IAccessStorage;
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MultipleAccessStorage(std::vector<std::unique_ptr<Storage>> nested_storages_);
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std::vector<UUID> findMultiple(std::type_index type, const String & name) const;
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template <typename EntityType>
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std::vector<UUID> findMultiple(const String & name) const { return findMultiple(EntityType::TYPE, name); }
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const Storage * findStorage(const UUID & id) const;
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Storage * findStorage(const UUID & id);
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const Storage & getStorage(const UUID & id) const;
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Storage & getStorage(const UUID & id);
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Storage & getStorageByIndex(size_t i) { return *(nested_storages[i]); }
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const Storage & getStorageByIndex(size_t i) const { return *(nested_storages[i]); }
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protected:
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std::optional<UUID> findImpl(std::type_index type, const String & name) const override;
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std::vector<UUID> findAllImpl(std::type_index type) const override;
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bool existsImpl(const UUID & id) const override;
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AccessEntityPtr readImpl(const UUID & id) const override;
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String readNameImpl(const UUID &id) const override;
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bool canInsertImpl(const AccessEntityPtr & entity) const override;
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UUID insertImpl(const AccessEntityPtr & entity, bool replace_if_exists) override;
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void removeImpl(const UUID & id) override;
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void updateImpl(const UUID & id, const UpdateFunc & update_func) override;
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ext::scope_guard subscribeForChangesImpl(const UUID & id, const OnChangedHandler & handler) const override;
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ext::scope_guard subscribeForChangesImpl(std::type_index type, const OnChangedHandler & handler) const override;
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bool hasSubscriptionImpl(const UUID & id) const override;
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bool hasSubscriptionImpl(std::type_index type) const override;
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private:
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std::vector<std::unique_ptr<Storage>> nested_storages;
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mutable LRUCache<UUID, Storage *> ids_cache;
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mutable std::mutex ids_cache_mutex;
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};
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}
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