blob: 6c6ce340c080170909bc590df7c3934817d22330 (
plain)
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
|
<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*/
namespace Piwik\Concurrency;
use Piwik\Option;
/**
* Manages a simple distributed list stored in an Option. No locking occurs, so the list
* is not thread safe, and should only be used for use cases where atomicity is not
* important.
*
* The list of items is serialized and stored in an Option. Items are converted to string
* before being persisted, so it is not expected to unserialize objects.
*/
class DistributedList
{
/**
* The name of the option to store the list in.
*
* @var string
*/
private $optionName;
/**
* Constructor.
*
* @param string $optionName
*/
public function __construct($optionName)
{
$this->optionName = $optionName;
}
/**
* Queries the option table and returns all items in this list.
*
* @return array
*/
public function getAll()
{
Option::clearCachedOption($this->optionName);
$array = Option::get($this->optionName);
if ($array
&& ($array = unserialize($array))
&& count($array)
) {
return $array;
}
return array();
}
/**
* Sets the contents of the list in the option table.
*
* @param string[] $items
*/
public function setAll($items)
{
foreach ($items as $key => &$item) {
if (is_array($item)) {
throw new \InvalidArgumentException("Array item encountered in DistributedList::setAll() [ key = $key ].");
} else {
$item = (string)$item;
}
}
Option::set($this->optionName, serialize($items));
}
/**
* Adds one or more items to the list in the option table.
*
* @param string|array $item
*/
public function add($item)
{
$allItems = $this->getAll();
if (is_array($item)) {
$allItems = array_merge($allItems, $item);
} else {
$allItems[] = $item;
}
$this->setAll($allItems);
}
/**
* Removes one or more items by value from the list in the option table.
*
* Does not preserve array keys.
*
* @param string|array $items
*/
public function remove($items)
{
if (!is_array($items)) {
$items = array($items);
}
$allItems = $this->getAll();
foreach ($items as $item) {
$existingIndex = array_search($item, $allItems);
if ($existingIndex === false) {
return;
}
unset($allItems[$existingIndex]);
}
$this->setAll(array_values($allItems));
}
/**
* Removes one or more items by index from the list in the option table.
*
* Does not preserve array keys.
*
* @param int[]|int $indices
*/
public function removeByIndex($indices)
{
if (!is_array($indices)) {
$indices = array($indices);
}
$indices = array_unique($indices);
$allItems = $this->getAll();
foreach ($indices as $index) {
unset($allItems[$index]);
}
$this->setAll(array_values($allItems));
}
}
|
