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/*
* Copyright (C) 2003-2014 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.
*/
#ifndef MPD_LAZY_DATABASE_PLUGIN_HXX
#define MPD_LAZY_DATABASE_PLUGIN_HXX
#include "db/DatabasePlugin.hxx"
/**
* A wrapper for a #Database object that gets opened on the first
* database access. This works around daemonization problems with
* some plugins.
*/
class LazyDatabase final : public Database {
Database *const db;
mutable bool open;
public:
gcc_nonnull_all
LazyDatabase(Database *_db)
:db(_db), open(false) {}
virtual ~LazyDatabase();
virtual void Close() override;
virtual const LightSong *GetSong(const char *uri_utf8,
Error &error) const override;
virtual void ReturnSong(const LightSong *song) const;
virtual bool Visit(const DatabaseSelection &selection,
VisitDirectory visit_directory,
VisitSong visit_song,
VisitPlaylist visit_playlist,
Error &error) const override;
virtual bool VisitUniqueTags(const DatabaseSelection &selection,
TagType tag_type,
VisitString visit_string,
Error &error) const override;
virtual bool GetStats(const DatabaseSelection &selection,
DatabaseStats &stats,
Error &error) const override;
virtual time_t GetUpdateStamp() const override;
private:
bool EnsureOpen(Error &error) const;
};
#endif
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