1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* 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_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 config_param;
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 config_param ¶m,
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;
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, 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 config_param ¶m, 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
|
