Method loadFromFile

source/PersisterInterface/SavepointTableService.cpp:29–63

}

auto SavepointTableService::loadFromFile(std::string const& filename) -> std::variant<SavepointTable, Error>
{
    try {
        auto directory = std::filesystem::path(filename).parent_path();

        // directory does not exist
        if (!std::filesystem::exists(directory)) {
            return Error{};
        }

        // no write access
        if (!hasWriteAccess(directory)) {
            return Error{};
        }

        // savepoint file does not exist
        if (!std::filesystem::exists(filename)) {
            return SavepointTable(filename, {});
        }

        std::ifstream stream(filename, std::ios::binary);
        if (!stream) {
            return Error{};
        }

        boost::property_tree::ptree tree;
        boost::property_tree::read_json(stream, tree);
        SavepointTable result(filename, std::deque<SavepointEntry>());
        encodeDecode(tree, result, ParserTask::Decode);

        return result;
    } catch (...) {
        return Error{};
    }
}

std::vector<SavepointEntry> SavepointTableService::truncate(SavepointTable& table, int newSize) const
{