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dindexer/include/backends/backend_loader.hpp
King_DuckZ e2275ce5db Add a backend interface version number for eventual future changes.
Note that the interface is still a work in progress and might change
while still keeping the same interface version. This is going to be true
until the first stable release of this project (non beta).
2016-06-02 10:01:19 +02:00

62 lines
1.8 KiB
C++

/* Copyright 2015, 2016, Michele Santullo
* This file is part of "dindexer".
*
* "dindexer" 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.
*
* "dindexer" 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 "dindexer". If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef id756A258A98B24B0DB2529BCEEC5137E2
#define id756A258A98B24B0DB2529BCEEC5137E2
#include <string>
#include <memory>
#include <boost/utility/string_ref.hpp>
namespace YAML {
class Node;
} //namespace YAML
namespace dindb {
class Backend;
using BackendPtr = std::unique_ptr<dindb::Backend, void(*)(dindb::Backend*)>;
class BackendPlugin {
public:
BackendPlugin ( void );
BackendPlugin ( BackendPlugin&& ) = default;
BackendPlugin ( const std::string& parSOPath, const YAML::Node* parConfig );
~BackendPlugin ( void ) noexcept;
const boost::string_ref& name ( void ) const;
Backend& backend ( void );
const Backend& backend ( void ) const;
bool is_loaded ( void ) const;
int backend_interface_version ( void ) const;
int max_supported_interface_version ( void ) const;
BackendPlugin& operator= ( BackendPlugin&& ) = default;
private:
using SoHandle = std::unique_ptr<void, int(*)(void*)>;
SoHandle m_lib;
BackendPtr m_backend;
boost::string_ref m_name;
int m_iface_ver;
};
std::string backend_name ( const std::string& parSOPath );
} //namespace dindb
#endif