storage_engine_metadata.h

Go to the documentation of this file.

#pragma once

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

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

namespace mongo {

class StorageEngineMetadata {
    MONGO_DISALLOW_COPYING(StorageEngineMetadata);

public:
    static std::unique_ptr<StorageEngineMetadata> forPath(const std::string& dbpath);

    static boost::optional<std::string> getStorageEngineForPath(const std::string& dbpath);

    StorageEngineMetadata(const std::string& dbpath);

    virtual ~StorageEngineMetadata();

    const std::string& getStorageEngine() const;

    const BSONObj& getStorageEngineOptions() const;

    void setStorageEngine(const std::string& storageEngine);

    void setStorageEngineOptions(const BSONObj& storageEngineOptions);

    void reset();

    Status read();

    Status write() const;

    template <typename T>
    Status validateStorageEngineOption(StringData fieldName,
                                       T expectedValue,
                                       boost::optional<T> defaultValue = boost::none) const;

private:
    std::string _dbpath;
    std::string _storageEngine;
    BSONObj _storageEngineOptions;
};

}  // namespace mongo