storage_engine_lock_file.h

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#pragma once

#include <boost/optional.hpp>
#include <memory>
#include <string>

#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/db/service_context.h"

namespace mongo {

class StorageEngineLockFile {
    MONGO_DISALLOW_COPYING(StorageEngineLockFile);

public:
    static boost::optional<StorageEngineLockFile>& get(ServiceContext* service);

    StorageEngineLockFile(const std::string& dbpath);

    virtual ~StorageEngineLockFile();

    std::string getFilespec() const;

    bool createdByUncleanShutdown() const;

    Status open();

    void close();

    Status writePid();

    void clearPidAndUnlock();

private:
    std::string _dbpath;
    std::string _filespec;
    bool _uncleanShutdown;

    class LockFileHandle;
    std::unique_ptr<LockFileHandle> _lockFileHandle;
};

}  // namespace mongo