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/*
* Copyright (C) 2003-2015 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_SIMPLE_DATABASE_PLUGIN_HXX
#define MPD_SIMPLE_DATABASE_PLUGIN_HXX
#include "check.h"
#include "db/Interface.hxx"
#include "fs/AllocatedPath.hxx"
#include "db/LightSong.hxx"
#include "Compiler.h"
#include <cassert>
struct ConfigBlock;
struct Directory;
struct DatabasePlugin;
class EventLoop;
class DatabaseListener;
class PrefixedLightSong;
class SimpleDatabase : public Database {
AllocatedPath path;
std::string path_utf8;
#ifdef ENABLE_ZLIB
bool compress;
#endif
/**
* The path where cache files for Mount() are located.
*/
AllocatedPath cache_path;
Directory *root;
time_t mtime;
/**
* A buffer for GetSong() when prefixing the #LightSong
* instance from a mounted #Database.
*/
mutable PrefixedLightSong *prefixed_light_song;
/**
* A buffer for GetSong().
*/
mutable LightSong light_song;
#ifndef NDEBUG
mutable unsigned borrowed_song_count;
#endif
SimpleDatabase();
SimpleDatabase(AllocatedPath &&_path, bool _compress);
public:
static Database *Create(EventLoop &loop, DatabaseListener &listener,
const ConfigBlock &block,
Error &error);
gcc_pure
Directory &GetRoot() {
assert(root != NULL);
return *root;
}
bool Save(Error &error);
/**
* Returns true if there is a valid database file on the disk.
*/
bool FileExists() const {
return mtime > 0;
}
/**
* @param db the #Database to be mounted; must be "open"; on
* success, this object gains ownership of the given #Database
*/
gcc_nonnull_all
bool Mount(const char *uri, Database *db, Error &error);
gcc_nonnull_all
bool Mount(const char *local_uri, const char *storage_uri,
Error &error);
gcc_nonnull_all
bool Unmount(const char *uri);
/* virtual methods from class Database */
virtual bool Open(Error &error) override;
virtual void Close() override;
const LightSong *GetSong(const char *uri_utf8,
Error &error) const override;
void ReturnSong(const LightSong *song) const override;
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, uint32_t group_mask,
VisitTag visit_tag,
Error &error) const override;
virtual bool GetStats(const DatabaseSelection &selection,
DatabaseStats &stats,
Error &error) const override;
virtual time_t GetUpdateStamp() const override {
return mtime;
}
private:
bool Configure(const ConfigBlock &block, Error &error);
gcc_pure
bool Check(Error &error) const;
bool Load(Error &error);
Database *LockUmountSteal(const char *uri);
};
extern const DatabasePlugin simple_db_plugin;
#endif
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