rocksDbHelpers.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 <mutex>
#include <rocksdb/db.h>
#include <rocksdb/slice_transform.h>
#include <string>
 
namespace l {
    class PathSliceTransform : public ::rocksdb::SliceTransform {
    public:
        const char *Name() const {
            return "Path Slice Transform";
        }
        ::rocksdb::Slice Transform(const ::rocksdb::Slice &key) const {
            std::string key_str = key.ToString();
            return ::rocksdb::Slice(key_str.substr(0, key_str.find('/')));
        }
        bool InDomain(const ::rocksdb::Slice &key) const {
            return key.ToString().find('/') != std::string::npos;
        }
        bool InRange(const ::rocksdb::Slice & /*dst*/) const {
            return false;
        }
        bool FullLengthEnabled(size_t * /*len*/) const {
            return false;
        }
        virtual bool SameResultWhenAppended(const ::rocksdb::Slice & /*prefix*/) const {
            return false;
        }
    };
 
    extern const PathSliceTransform *NewPathSliceTransform();
 
    namespace rocksdb {
        extern std::mutex global_lock_;
    } // namespace rocksdb
} // namespace l