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Diffstat (limited to 'src/db/plugins/LazyDatabase.hxx')
-rw-r--r-- | src/db/plugins/LazyDatabase.hxx | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/db/plugins/LazyDatabase.hxx b/src/db/plugins/LazyDatabase.hxx new file mode 100644 index 000000000..336b8558f --- /dev/null +++ b/src/db/plugins/LazyDatabase.hxx @@ -0,0 +1,69 @@ +/* + * 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 |