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81 lines
3.4 KiB
C++
81 lines
3.4 KiB
C++
#pragma once
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#include "DiskDecorator.h"
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#include <common/logger_useful.h>
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#include <shared_mutex>
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namespace DB
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{
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using ReadLock = std::shared_lock<std::shared_timed_mutex>;
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using WriteLock = std::unique_lock<std::shared_timed_mutex>;
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class RestartAwareReadBuffer;
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class RestartAwareWriteBuffer;
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/**
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* Gives possibility to change underlying disk settings at runtime calling 'restart' method.
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* All disk methods are protected by read-lock. Read/Write buffers produced by disk holds read-lock till buffer is finalized/destructed.
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* When 'restart' method is called write-lock is acquired to make sure that no operations are running on that disk.
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*/
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class DiskRestartProxy : public DiskDecorator
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{
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public:
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explicit DiskRestartProxy(DiskPtr & delegate_);
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ReservationPtr reserve(UInt64 bytes) override;
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const String & getPath() const 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;
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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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size_t getFileSize(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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void clearDirectory(const String & path) override;
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void moveDirectory(const String & from_path, const String & to_path) override;
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DiskDirectoryIteratorPtr iterateDirectory(const String & path) override;
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void createFile(const String & path) override;
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void moveFile(const String & from_path, const String & to_path) override;
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void replaceFile(const String & from_path, const String & to_path) override;
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void copy(const String & from_path, const DiskPtr & to_disk, const String & to_path) override;
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void listFiles(const String & path, std::vector<String> & file_names) override;
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std::unique_ptr<ReadBufferFromFileBase> readFile(
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const String & path,
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size_t buf_size,
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size_t estimated_size,
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size_t aio_threshold,
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size_t mmap_threshold,
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MMappedFileCache * mmap_cache) const override;
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std::unique_ptr<WriteBufferFromFileBase> writeFile(const String & path, size_t buf_size, WriteMode mode) override;
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void removeFile(const String & path) override;
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void removeFileIfExists(const String & path) override;
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void removeDirectory(const String & path) override;
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void removeRecursive(const String & path) override;
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void removeSharedFile(const String & path, bool keep_s3) override;
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void removeSharedRecursive(const String & path, bool keep_s3) override;
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void setLastModified(const String & path, const Poco::Timestamp & timestamp) override;
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Poco::Timestamp getLastModified(const String & path) override;
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void setReadOnly(const String & path) override;
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void createHardLink(const String & src_path, const String & dst_path) override;
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void truncateFile(const String & path, size_t size) override;
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String getUniqueId(const String & path) const override;
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bool checkUniqueId(const String & id) const override;
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void restart();
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private:
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friend class RestartAwareReadBuffer;
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friend class RestartAwareWriteBuffer;
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/// Mutex to protect RW access.
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mutable std::shared_timed_mutex mutex;
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Poco::Logger * log = &Poco::Logger::get("DiskRestartProxy");
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};
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}
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