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1 | <?php |
2 | /** |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
16 | * http://www.gnu.org/copyleft/gpl.html |
17 | * |
18 | * @file |
19 | */ |
20 | |
21 | namespace MediaWiki\Site; |
22 | |
23 | use Wikimedia\ObjectCache\BagOStuff; |
24 | |
25 | /** |
26 | * Hold a configured list of sites (SiteList), with a caching layer. |
27 | * |
28 | * @internal For use by core ServiceWiring only. The public interface is SiteStore |
29 | * @ingroup Site |
30 | * @author Jeroen De Dauw < jeroendedauw@gmail.com > |
31 | * @author Katie Filbert < aude.wiki@gmail.com > |
32 | */ |
33 | class CachingSiteStore implements SiteStore { |
34 | /** @var SiteStore */ |
35 | private $siteStore; |
36 | /** @var BagOStuff */ |
37 | private $cache; |
38 | |
39 | /** @var string|null */ |
40 | private $cacheKey = null; |
41 | /** @var SiteList|null */ |
42 | private $sites = null; |
43 | |
44 | public function __construct( |
45 | SiteStore $siteStore, |
46 | BagOStuff $cache |
47 | ) { |
48 | $this->siteStore = $siteStore; |
49 | $this->cache = $cache; |
50 | } |
51 | |
52 | /** |
53 | * Constructs a cache key to use for caching the list of sites. |
54 | * |
55 | * This includes the concrete class name of the site list as well as a version identifier |
56 | * for the list's serialization, to avoid problems when unserializing site lists serialized |
57 | * by an older version, e.g. when reading from a cache. |
58 | * |
59 | * The cache key also includes information about where the sites were loaded from, e.g. |
60 | * the name of a database table. |
61 | * |
62 | * @see SiteList::getSerialVersionId |
63 | * |
64 | * @return string The cache key. |
65 | */ |
66 | private function getCacheKey() { |
67 | if ( $this->cacheKey === null ) { |
68 | $version = SiteList::getSerialVersionId(); |
69 | $this->cacheKey = $this->cache->makeKey( 'site-SiteList', $version ); |
70 | } |
71 | |
72 | return $this->cacheKey; |
73 | } |
74 | |
75 | /** |
76 | * @see SiteStore::getSites |
77 | * |
78 | * @since 1.25 |
79 | * @return SiteList |
80 | */ |
81 | public function getSites() { |
82 | if ( $this->sites === null ) { |
83 | $this->sites = $this->cache->getWithSetCallback( |
84 | $this->getCacheKey(), |
85 | BagOStuff::TTL_HOUR, |
86 | function () { |
87 | return $this->siteStore->getSites(); |
88 | } |
89 | ); |
90 | } |
91 | |
92 | return $this->sites; |
93 | } |
94 | |
95 | /** |
96 | * @see SiteStore::getSite |
97 | * |
98 | * @since 1.25 |
99 | * @param string $globalId |
100 | * @return Site|null |
101 | */ |
102 | public function getSite( $globalId ) { |
103 | $sites = $this->getSites(); |
104 | |
105 | return $sites->hasSite( $globalId ) ? $sites->getSite( $globalId ) : null; |
106 | } |
107 | |
108 | /** |
109 | * @see SiteStore::saveSite |
110 | * |
111 | * @since 1.25 |
112 | * @param Site $site |
113 | * @return bool Success indicator |
114 | */ |
115 | public function saveSite( Site $site ) { |
116 | return $this->saveSites( [ $site ] ); |
117 | } |
118 | |
119 | /** |
120 | * @see SiteStore::saveSites |
121 | * |
122 | * @since 1.25 |
123 | * @param Site[] $sites |
124 | * @return bool Success indicator |
125 | */ |
126 | public function saveSites( array $sites ) { |
127 | if ( !$sites ) { |
128 | return true; |
129 | } |
130 | |
131 | $success = $this->siteStore->saveSites( $sites ); |
132 | |
133 | // purge cache |
134 | $this->reset(); |
135 | |
136 | return $success; |
137 | } |
138 | |
139 | /** |
140 | * Purge the internal and external cache of the site list, forcing the list. |
141 | * of sites to be reloaded. |
142 | * |
143 | * @since 1.25 |
144 | */ |
145 | public function reset() { |
146 | $this->cache->delete( $this->getCacheKey() ); |
147 | $this->sites = null; |
148 | } |
149 | |
150 | /** |
151 | * Clears the list of sites stored. |
152 | * |
153 | * NOTE: The fact that this also clears the in-process cache is an internal |
154 | * detail for PHPUnit testing only. The injected cache is generally APCU, |
155 | * which is per-server, so the cache reset would not apply to any other web servers. |
156 | * |
157 | * @see SiteStore::clear() |
158 | * @return bool Success |
159 | */ |
160 | public function clear() { |
161 | $this->reset(); |
162 | |
163 | return $this->siteStore->clear(); |
164 | } |
165 | |
166 | } |
167 | |
168 | /** @deprecated class alias since 1.42 */ |
169 | class_alias( CachingSiteStore::class, 'CachingSiteStore' ); |