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#pragma once
#include <boost/noncopyable.hpp>
#include <mutex>
#include <string>
#include <unordered_set>
namespace DB
{
/// Manages set of active temporary paths that should not be cleaned by background thread.
class TemporaryParts : private boost::noncopyable
{
private:
/// To add const qualifier for contains()
mutable std::mutex mutex;
/// NOTE: It is pretty short, so use STL is fine.
std::unordered_set<std::string> parts;
void add(const std::string & basename);
void remove(const std::string & basename);
friend class MergeTreeData;
public:
/// Returns true if passed part name is active.
/// (is the destination for one of active mutation/merge).
///
/// NOTE: that it accept basename (i.e. dirname), not the path,
/// since later requires canonical form.
bool contains(const std::string & basename) const;
};
}
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