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