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
|
/*
* Copyright 2003-2018 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_UPDATE_SERVICE_HXX
#define MPD_UPDATE_SERVICE_HXX
#include "check.h"
#include "Config.hxx"
#include "Queue.hxx"
#include "event/DeferEvent.hxx"
#include "thread/Thread.hxx"
#include "util/Compiler.h"
class SimpleDatabase;
class DatabaseListener;
class UpdateWalk;
class CompositeStorage;
/**
* This class manages the update queue and runs the update thread.
*/
class UpdateService final {
const UpdateConfig config;
DeferEvent defer;
SimpleDatabase &db;
CompositeStorage &storage;
DatabaseListener &listener;
bool modified;
Thread update_thread;
static constexpr unsigned update_task_id_max = 1 << 15;
unsigned update_task_id = 0;
UpdateQueue queue;
UpdateQueueItem next;
UpdateWalk *walk = nullptr;
public:
UpdateService(const ConfigData &_config,
EventLoop &_loop, SimpleDatabase &_db,
CompositeStorage &_storage,
DatabaseListener &_listener);
~UpdateService();
EventLoop &GetEventLoop() noexcept {
return defer.GetEventLoop();
}
/**
* Returns a non-zero job id when we are currently updating
* the database.
*/
unsigned GetId() const {
return next.id;
}
/**
* Add this path to the database update queue.
*
* Throws on error
*
* @param path a path to update; if an empty string,
* the whole music directory is updated
* @return the job id
*/
gcc_nonnull_all
unsigned Enqueue(const char *path, bool discard);
/**
* Clear the queue and cancel the current update. Does not
* wait for the thread to exit.
*/
void CancelAllAsync();
/**
* Cancel all updates for the given mount point. If an update
* is already running for it, the method will wait for
* cancellation to complete.
*/
void CancelMount(const char *uri);
private:
/* DeferEvent callback */
void RunDeferred() noexcept;
/* the update thread */
void Task();
void StartThread(UpdateQueueItem &&i);
unsigned GenerateId();
};
#endif
|
