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124 lines
3.1 KiB
C++
124 lines
3.1 KiB
C++
#pragma once
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#include <Disks/IDisk.h>
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#include <IO/ReadBufferFromFile.h>
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#include <IO/WriteBufferFromFile.h>
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#include <mutex>
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#include <Poco/DirectoryIterator.h>
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#include <Poco/File.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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class DiskLocalReservation;
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class DiskLocal : public IDisk
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{
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public:
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friend class DiskLocalReservation;
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DiskLocal(const String & name_, const String & path_, UInt64 keep_free_space_bytes_)
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: name(name_), disk_path(path_), keep_free_space_bytes(keep_free_space_bytes_)
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{
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if (disk_path.back() != '/')
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throw Exception("Disk path must ends with '/', but '" + disk_path + "' doesn't.", ErrorCodes::LOGICAL_ERROR);
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}
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const String & getName() const override { return name; }
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const String & getPath() const override { return disk_path; }
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ReservationPtr reserve(UInt64 bytes) override;
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UInt64 getTotalSpace() const override;
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UInt64 getAvailableSpace() const override;
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UInt64 getUnreservedSpace() const override;
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UInt64 getKeepingFreeSpace() const override { return keep_free_space_bytes; }
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bool exists(const String & path) const override;
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bool isFile(const String & path) const override;
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bool isDirectory(const String & path) const override;
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void createDirectory(const String & path) override;
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void createDirectories(const String & path) override;
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DiskDirectoryIteratorPtr iterateDirectory(const String & path) override;
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void moveFile(const String & from_path, const String & to_path) override;
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void copyFile(const String & from_path, const String & to_path) override;
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std::unique_ptr<ReadBuffer> readFile(const String & path) const override;
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std::unique_ptr<WriteBuffer> writeFile(const String & path) override;
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private:
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bool tryReserve(UInt64 bytes);
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private:
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const String name;
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const String disk_path;
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const UInt64 keep_free_space_bytes;
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/// Used for reservation counters modification
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static std::mutex mutex;
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UInt64 reserved_bytes = 0;
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UInt64 reservation_count = 0;
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};
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using DiskLocalPtr = std::shared_ptr<DiskLocal>;
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class DiskLocalDirectoryIterator : public IDiskDirectoryIterator
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{
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public:
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explicit DiskLocalDirectoryIterator(const String & path) : iter(path) {}
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void next() override { ++iter; }
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bool isValid() const override { return iter != Poco::DirectoryIterator(); }
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String name() const override { return iter.name(); }
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private:
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Poco::DirectoryIterator iter;
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};
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class DiskLocalReservation : public IReservation
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{
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public:
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DiskLocalReservation(const DiskLocalPtr & disk_, UInt64 size_)
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: disk(disk_), size(size_), metric_increment(CurrentMetrics::DiskSpaceReservedForMerge, size_)
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{
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}
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UInt64 getSize() const override { return size; }
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DiskPtr getDisk() const override { return disk; }
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void update(UInt64 new_size) override;
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~DiskLocalReservation() override;
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private:
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DiskLocalPtr disk;
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UInt64 size;
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CurrentMetrics::Increment metric_increment;
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};
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class DiskFactory;
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void registerDiskLocal(DiskFactory & factory);
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}
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