mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-21 23:21:59 +00:00
77 lines
3.5 KiB
C++
77 lines
3.5 KiB
C++
#pragma once
|
|
|
|
#include <Access/MemoryAccessStorage.h>
|
|
#include <Common/ThreadPool.h>
|
|
#include <boost/container/flat_set.hpp>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
/// Loads and saves access entities on a local disk to a specified directory.
|
|
class DiskAccessStorage : public IAccessStorage
|
|
{
|
|
public:
|
|
DiskAccessStorage();
|
|
~DiskAccessStorage() override;
|
|
|
|
void setDirectory(const String & directory_path_);
|
|
|
|
private:
|
|
std::optional<UUID> findImpl(std::type_index type, const String & name) const override;
|
|
std::vector<UUID> findAllImpl(std::type_index type) const override;
|
|
bool existsImpl(const UUID & id) const override;
|
|
AccessEntityPtr readImpl(const UUID & id) const override;
|
|
String readNameImpl(const UUID & id) const override;
|
|
bool canInsertImpl(const AccessEntityPtr & entity) const override;
|
|
UUID insertImpl(const AccessEntityPtr & entity, bool replace_if_exists) override;
|
|
void removeImpl(const UUID & id) override;
|
|
void updateImpl(const UUID & id, const UpdateFunc & update_func) override;
|
|
ext::scope_guard subscribeForChangesImpl(const UUID & id, const OnChangedHandler & handler) const override;
|
|
ext::scope_guard subscribeForChangesImpl(std::type_index type, const OnChangedHandler & handler) const override;
|
|
bool hasSubscriptionImpl(const UUID & id) const override;
|
|
bool hasSubscriptionImpl(std::type_index type) const override;
|
|
|
|
void initialize(const String & directory_path_, Notifications & notifications);
|
|
bool readLists();
|
|
bool writeLists();
|
|
void scheduleWriteLists(std::type_index type);
|
|
bool rebuildLists();
|
|
|
|
void startListsWritingThread();
|
|
void stopListsWritingThread();
|
|
void listsWritingThreadFunc();
|
|
|
|
void insertNoLock(const UUID & id, const AccessEntityPtr & new_entity, bool replace_if_exists, Notifications & notifications);
|
|
void removeNoLock(const UUID & id, Notifications & notifications);
|
|
void updateNoLock(const UUID & id, const UpdateFunc & update_func, Notifications & notifications);
|
|
|
|
AccessEntityPtr readAccessEntityFromDisk(const UUID & id) const;
|
|
void writeAccessEntityToDisk(const UUID & id, const IAccessEntity & entity) const;
|
|
void deleteAccessEntityOnDisk(const UUID & id) const;
|
|
|
|
using NameToIDMap = std::unordered_map<String, UUID>;
|
|
struct Entry
|
|
{
|
|
Entry(const std::string_view & name_, std::type_index type_) : name(name_), type(type_) {}
|
|
std::string_view name; /// view points to a string in `name_to_id_maps`.
|
|
std::type_index type;
|
|
mutable AccessEntityPtr entity; /// may be nullptr, if the entity hasn't been loaded yet.
|
|
mutable std::list<OnChangedHandler> handlers_by_id;
|
|
};
|
|
|
|
void prepareNotifications(const UUID & id, const Entry & entry, bool remove, Notifications & notifications) const;
|
|
|
|
String directory_path;
|
|
bool initialized = false;
|
|
std::unordered_map<std::type_index, NameToIDMap> name_to_id_maps;
|
|
std::unordered_map<UUID, Entry> id_to_entry_map;
|
|
boost::container::flat_set<std::type_index> types_of_lists_to_write;
|
|
bool failed_to_write_lists = false; /// Whether writing of the list files has been failed since the recent restart of the server.
|
|
ThreadFromGlobalPool lists_writing_thread; /// List files are written in a separate thread.
|
|
std::condition_variable lists_writing_thread_should_exit; /// Signals `lists_writing_thread` to exit.
|
|
std::atomic<bool> lists_writing_thread_exited = false;
|
|
mutable std::unordered_multimap<std::type_index, OnChangedHandler> handlers_by_type;
|
|
mutable std::mutex mutex;
|
|
};
|
|
}
|