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#pragma once
#include <Common/CurrentMetrics.h>
#include <memory>
#include <mutex>
namespace CurrentMetrics
{
extern const Metric OpenFileForRead;
}
namespace DB
{
/// RAII for readonly opened file descriptor.
class OpenedFile
{
public:
OpenedFile(const std::string & file_name_, int flags_);
~OpenedFile();
/// Close prematurally.
void close();
int getFD() const;
std::string getFileName() const;
private:
std::string file_name;
int flags = 0;
mutable int fd = -1;
mutable std::mutex mutex;
CurrentMetrics::Increment metric_increment{CurrentMetrics::OpenFileForRead};
void open() const;
};
}
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