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30 lines
703 B
C++
30 lines
703 B
C++
#pragma once
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#include <IO/ReadBufferFromFileBase.h>
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#include <IO/MMappedFileCache.h>
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#include <IO/MMapReadBufferFromFileDescriptor.h>
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namespace DB
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{
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class MMapReadBufferFromFileWithCache : public ReadBufferFromFileBase
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{
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public:
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MMapReadBufferFromFileWithCache(MMappedFileCache & cache, const std::string & file_name, size_t offset, size_t length);
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/// Map till end of file.
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MMapReadBufferFromFileWithCache(MMappedFileCache & cache, const std::string & file_name, size_t offset);
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off_t getPosition() override;
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std::string getFileName() const override;
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off_t seek(off_t offset, int whence) override;
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private:
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MMappedFileCache::MappedPtr mapped;
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void init();
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};
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}
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