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/*
Copyright 2018-2021, Barcelona Supercomputing Center (BSC), Spain
Copyright 2015-2021, Johannes Gutenberg Universitaet Mainz, Germany
This software was partially supported by the
EC H2020 funded project NEXTGenIO (Project ID: 671951, www.nextgenio.eu).
This software was partially supported by the
ADA-FS project under the SPPEXA project funded by the DFG.
This file is part of GekkoFS.
GekkoFS 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.
GekkoFS 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 GekkoFS. If not, see <https://www.gnu.org/licenses/>.
SPDX-License-Identifier: GPL-3.0-or-later
*/
#ifndef GEKKOFS_METADATA_BACKEND_HPP
#define GEKKOFS_METADATA_BACKEND_HPP
#include <memory>
#include <spdlog/spdlog.h>
#include <daemon/backend/exceptions.hpp>
#include <tuple>
namespace gkfs::metadata {
class AbstractMetadataBackend {
public:
virtual ~AbstractMetadataBackend() = default;
virtual std::string
get(const std::string& key) const = 0;
virtual void
put(const std::string& key, const std::string& val) = 0;
virtual void
put_no_exist(const std::string& key, const std::string& val) = 0;
virtual void
remove(const std::string& key) = 0;
virtual bool
exists(const std::string& key) = 0;
virtual void
update(const std::string& old_key, const std::string& new_key,
const std::string& val) = 0;
virtual void
increase_size(const std::string& key, size_t size, bool append) = 0;
virtual void
decrease_size(const std::string& key, size_t size) = 0;
virtual std::vector<std::pair<std::string, bool>>
get_dirents(const std::string& dir) const = 0;
virtual std::vector<std::tuple<std::string, bool, size_t, time_t>>
get_dirents_extended(const std::string& dir) const = 0;
virtual void
iterate_all() const = 0;
};
template <typename T>
class MetadataBackend : public AbstractMetadataBackend {
private:
std::string path;
std::shared_ptr<spdlog::logger> log_;
public:
std::string
get(const std::string& key) const {
return static_cast<T const&>(*this).get_impl(key);
}
void
put(const std::string& key, const std::string& val) {
static_cast<T&>(*this).put_impl(key, val);
}
void
put_no_exist(const std::string& key, const std::string& val) {
static_cast<T&>(*this).put_no_exist_impl(key, val);
}
void
remove(const std::string& key) {
static_cast<T&>(*this).remove_impl(key);
}
bool
exists(const std::string& key) {
return static_cast<T&>(*this).exists_impl(key);
}
void
update(const std::string& old_key, const std::string& new_key,
const std::string& val) {
static_cast<T&>(*this).update_impl(old_key, new_key, val);
}
void
increase_size(const std::string& key, size_t size, bool append) {
static_cast<T&>(*this).increase_size_impl(key, size, append);
}
void
decrease_size(const std::string& key, size_t size) {
static_cast<T&>(*this).decrease_size_impl(key, size);
}
std::vector<std::pair<std::string, bool>>
get_dirents(const std::string& dir) const {
return static_cast<T const&>(*this).get_dirents_impl(dir);
}
std::vector<std::tuple<std::string, bool, size_t, time_t>>
get_dirents_extended(const std::string& dir) const {
return static_cast<T const&>(*this).get_dirents_extended_impl(dir);
}
void
iterate_all() const {
static_cast<T const&>(*this).iterate_all_impl();
}
};
} // namespace gkfs::metadata
#endif // GEKKOFS_METADATA_BACKEND_HPP