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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/** \file
*
* This header declares the db_plugin class. It describes a
* plugin API for databases of song metadata.
*/
#ifndef MPD_DATABASE_PLUGIN_HXX
#define MPD_DATABASE_PLUGIN_HXX
#include "Ptr.hxx"
struct ConfigBlock;
class EventLoop;
class DatabaseListener;
struct DatabasePlugin {
/**
* This plugin requires a #Storage instance. It contains only
* cached metadata from files in the #Storage.
*/
static constexpr unsigned FLAG_REQUIRE_STORAGE = 0x1;
const char *name;
unsigned flags;
/**
* Allocates and configures a database.
*
* Throws #std::runtime_error on error.
*
* @param main_event_loop the #EventLoop running in the same
* thread which invokes #Database methods
* @param io_event_loop the #EventLoop running on the
* #EventThread, i.e. the one used for background I/O
*/
DatabasePtr (*create)(EventLoop &main_event_loop,
EventLoop &io_event_loop,
DatabaseListener &listener,
const ConfigBlock &block);
constexpr bool RequireStorage() const {
return flags & FLAG_REQUIRE_STORAGE;
}
};
#endif
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