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