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#pragma once
#include <Core/Types.h>
#include <memory>
#include <Disks/IDisk.h>
#include <Common/CurrentMetrics.h>
namespace DB
{
using DiskPtr = std::shared_ptr<IDisk>;
/// This class helps with the handling of temporary files or directories.
/// A unique name for the temporary file or directory is automatically chosen based on a specified prefix.
/// Create a directory in the constructor.
/// The destructor always removes the temporary file or directory with all contained files.
class TemporaryFileOnDisk
{
public:
explicit TemporaryFileOnDisk(const DiskPtr & disk_, CurrentMetrics::Metric metric_scope);
explicit TemporaryFileOnDisk(const DiskPtr & disk_, const String & prefix = "tmp");
~TemporaryFileOnDisk();
DiskPtr getDisk() const { return disk; }
/// Return absolute path (disk + relative_path)
String getAbsolutePath() const;
/// Return relative path (without disk)
const String & getRelativePath() const { return relative_path; }
private:
DiskPtr disk;
/// Relative path in disk to the temporary file or directory
String relative_path;
CurrentMetrics::Increment metric_increment;
/// Specified if we know what for file is used (sort/aggregate/join).
std::optional<CurrentMetrics::Increment> sub_metric_increment = {};
};
using TemporaryFileOnDiskHolder = std::unique_ptr<TemporaryFileOnDisk>;
}
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