metadata.hpp

/*
 *    Copyright (C) 2019-2021 Joshua Boudreau <jboudreau@45drives.com>
 *
 *    This file is part of autotier.
 *
 *    autotier is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    autotier is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with autotier.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include "popularityCalc.hpp"
 
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <rocksdb/db.h>
 
class Tier;
 
class Metadata {
    friend class boost::serialization::access;
    friend class File;
    friend class MetadataViewer;
public:
    Metadata(void);
    Metadata(const std::string &serialized);
    Metadata(const Metadata &other);
    Metadata &operator=(const Metadata &other);
    Metadata(Metadata &&other);
    Metadata &operator=(Metadata &&other);
    ~Metadata(void) = default;
#ifndef BAREBONES_METADATA
 
    Metadata(std::string path, std::shared_ptr<rocksdb::DB> db, Tier *tptr = nullptr);
    void update(std::string relative_path, std::shared_ptr<rocksdb::DB> db, std::string *old_key = nullptr);
    void touch(void);
    std::string tier_path(void) const;
    void tier_path(const std::string &path);
    bool pinned(void) const;
    void pinned(bool val);
    double popularity(void) const;
    bool not_found(void) const;
    std::string dump_stats(void) const;
#endif
private:
    uintmax_t access_count_ = 0;
    double popularity_ = MULTIPLIER * AVG_USAGE;
    bool not_found_ = false;
    bool pinned_ = false;
    std::string tier_path_;
    template<class Archive>
    void serialize(Archive &ar, const unsigned int version) {
        (void)version;
        ar &tier_path_;
        ar &access_count_;
        ar &popularity_;
        ar &pinned_;
    }
};