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67 lines
2.6 KiB
C++
67 lines
2.6 KiB
C++
#pragma once
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#include <Disks/DiskType.h>
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#include <memory>
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#include <vector>
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#include <common/types.h>
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namespace DB
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{
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class IStoragePolicy;
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using StoragePolicyPtr = std::shared_ptr<const IStoragePolicy>;
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class IVolume;
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using VolumePtr = std::shared_ptr<IVolume>;
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using Volumes = std::vector<VolumePtr>;
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class IDisk;
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using DiskPtr = std::shared_ptr<IDisk>;
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using Disks = std::vector<DiskPtr>;
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class IReservation;
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using ReservationPtr = std::unique_ptr<IReservation>;
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using Reservations = std::vector<ReservationPtr>;
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using String = std::string;
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class IStoragePolicy
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{
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public:
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virtual ~IStoragePolicy() = default;
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virtual const String & getName() const = 0;
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virtual const Volumes & getVolumes() const = 0;
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/// Returns number [0., 1.] -- fraction of free space on disk
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/// which should be kept with help of background moves
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virtual double getMoveFactor() const = 0;
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virtual bool isDefaultPolicy() const = 0;
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/// Returns disks ordered by volumes priority
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virtual Disks getDisks() const = 0;
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/// Returns any disk
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/// Used when it's not important, for example for
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/// mutations files
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virtual DiskPtr getAnyDisk() const = 0;
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virtual DiskPtr getDiskByName(const String & disk_name) const = 0;
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/// Get free space from most free disk
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virtual UInt64 getMaxUnreservedFreeSpace() const = 0;
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/// Reserves space on any volume with index > min_volume_index or returns nullptr
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virtual ReservationPtr reserve(UInt64 bytes, size_t min_volume_index) const = 0;
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/// Returns valid reservation or nullptr
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virtual ReservationPtr reserve(UInt64 bytes) const = 0;
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/// Reserves space on any volume or throws
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virtual ReservationPtr reserveAndCheck(UInt64 bytes) const = 0;
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/// Reserves 0 bytes on disk with max available space
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/// Do not use this function when it is possible to predict size.
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virtual ReservationPtr makeEmptyReservationOnLargestDisk() const = 0;
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/// Get volume by index.
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virtual VolumePtr getVolume(size_t index) const = 0;
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virtual VolumePtr getVolumeByName(const String & volume_name) const = 0;
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/// Checks if storage policy can be replaced by another one.
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virtual void checkCompatibleWith(const StoragePolicyPtr & new_storage_policy) const = 0;
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/// Find volume index, which contains disk
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virtual size_t getVolumeIndexByDisk(const DiskPtr & disk_ptr) const = 0;
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/// Check if we have any volume with stopped merges
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virtual bool hasAnyVolumeWithDisabledMerges() const = 0;
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virtual bool containsVolume(const String & volume_name) const = 0;
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/// Returns disks by type ordered by volumes priority
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};
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}
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