62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
#pragma once
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#ifndef MESSMER_BLOCKSTORE_IMPLEMENTATIONS_ONDISK_ONDISKBLOCK_H_
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#define MESSMER_BLOCKSTORE_IMPLEMENTATIONS_ONDISK_ONDISKBLOCK_H_
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#include <boost/filesystem/path.hpp>
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#include "../../interface/Block.h"
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#include <cpp-utils/data/Data.h>
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#include <iostream>
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#include <cpp-utils/pointer/unique_ref.h>
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#include <mutex>
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namespace blockstore {
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namespace ondisk {
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class OnDiskBlockStore;
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class OnDiskBlock final: public Block {
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public:
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OnDiskBlock(const Key &key, const boost::filesystem::path &filepath, cpputils::Data data);
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~OnDiskBlock();
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static const std::string FORMAT_VERSION_HEADER_PREFIX;
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static const std::string FORMAT_VERSION_HEADER;
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static unsigned int formatVersionHeaderSize();
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static uint64_t blockSizeFromPhysicalBlockSize(uint64_t blockSize);
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static boost::optional<cpputils::unique_ref<OnDiskBlock>> LoadFromDisk(const boost::filesystem::path &rootdir, const Key &key);
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static boost::optional<cpputils::unique_ref<OnDiskBlock>> CreateOnDisk(const boost::filesystem::path &rootdir, const Key &key, cpputils::Data data);
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static void RemoveFromDisk(const boost::filesystem::path &rootdir, const Key &key);
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const void *data() const override;
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void write(const void *source, uint64_t offset, uint64_t size) override;
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void flush() override;
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size_t size() const override;
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void resize(size_t newSize) override;
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private:
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static bool _isAcceptedCryfsHeader(const cpputils::Data &data);
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static bool _isOtherCryfsHeader(const cpputils::Data &data);
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static void _checkHeader(std::istream *str);
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static boost::filesystem::path _getFilepath(const boost::filesystem::path &rootdir, const Key &key);
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const boost::filesystem::path _filepath;
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cpputils::Data _data;
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bool _dataChanged;
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static boost::optional<cpputils::Data> _loadFromDisk(const boost::filesystem::path &filepath);
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void _storeToDisk() const;
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std::mutex _mutex;
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DISALLOW_COPY_AND_ASSIGN(OnDiskBlock);
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};
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}
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}
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#endif
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