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#pragma once
#include <Common/CurrentMetrics.h>
#include <IO/MMapReadBufferFromFileDescriptor.h>
namespace CurrentMetrics
{
extern const Metric OpenFileForRead;
}
namespace DB
{
class MMapReadBufferFromFile : public MMapReadBufferFromFileDescriptor
{
public:
MMapReadBufferFromFile(const std::string & file_name_, size_t offset, size_t length_);
/// Map till end of file.
MMapReadBufferFromFile(const std::string & file_name_, size_t offset);
~MMapReadBufferFromFile() override;
void close();
std::string getFileName() const override;
private:
int fd = -1;
std::string file_name;
CurrentMetrics::Increment metric_increment{CurrentMetrics::OpenFileForRead};
void open();
};
}
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