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77 lines
3.5 KiB
C++
77 lines
3.5 KiB
C++
#pragma once
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#include <Access/MemoryAccessStorage.h>
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#include <Common/ThreadPool.h>
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#include <boost/container/flat_set.hpp>
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namespace DB
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{
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/// Loads and saves access entities on a local disk to a specified directory.
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class DiskAccessStorage : public IAccessStorage
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{
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public:
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DiskAccessStorage();
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~DiskAccessStorage() override;
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void setDirectory(const String & directory_path_);
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private:
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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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void initialize(const String & directory_path_, Notifications & notifications);
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bool readLists();
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bool writeLists();
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void scheduleWriteLists(std::type_index type);
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bool rebuildLists();
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void startListsWritingThread();
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void stopListsWritingThread();
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void listsWritingThreadFunc();
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void insertNoLock(const UUID & id, const AccessEntityPtr & new_entity, bool replace_if_exists, Notifications & notifications);
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void removeNoLock(const UUID & id, Notifications & notifications);
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void updateNoLock(const UUID & id, const UpdateFunc & update_func, Notifications & notifications);
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AccessEntityPtr readAccessEntityFromDisk(const UUID & id) const;
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void writeAccessEntityToDisk(const UUID & id, const IAccessEntity & entity) const;
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void deleteAccessEntityOnDisk(const UUID & id) const;
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using NameToIDMap = std::unordered_map<String, UUID>;
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struct Entry
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{
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Entry(const std::string_view & name_, std::type_index type_) : name(name_), type(type_) {}
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std::string_view name; /// view points to a string in `name_to_id_maps`.
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std::type_index type;
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mutable AccessEntityPtr entity; /// may be nullptr, if the entity hasn't been loaded yet.
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mutable std::list<OnChangedHandler> handlers_by_id;
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};
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void prepareNotifications(const UUID & id, const Entry & entry, bool remove, Notifications & notifications) const;
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String directory_path;
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bool initialized = false;
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std::unordered_map<std::type_index, NameToIDMap> name_to_id_maps;
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std::unordered_map<UUID, Entry> id_to_entry_map;
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boost::container::flat_set<std::type_index> types_of_lists_to_write;
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bool failed_to_write_lists = false; /// Whether writing of the list files has been failed since the recent restart of the server.
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ThreadFromGlobalPool lists_writing_thread; /// List files are written in a separate thread.
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std::condition_variable lists_writing_thread_should_exit; /// Signals `lists_writing_thread` to exit.
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std::atomic<bool> lists_writing_thread_exited = false;
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mutable std::unordered_multimap<std::type_index, OnChangedHandler> handlers_by_type;
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mutable std::mutex mutex;
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};
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}
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