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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace MediaWiki\Site; |
| 8 | |
| 9 | use Wikimedia\ObjectCache\BagOStuff; |
| 10 | |
| 11 | /** |
| 12 | * Wrap SiteList with an in-process cache and (optionally) a local-server cache. |
| 13 | * |
| 14 | * @internal For use by core ServiceWiring only. The public interface is SiteStore |
| 15 | * @ingroup Site |
| 16 | * @author Jeroen De Dauw < jeroendedauw@gmail.com > |
| 17 | * @author Katie Filbert < aude.wiki@gmail.com > |
| 18 | */ |
| 19 | class CachingSiteStore implements SiteStore { |
| 20 | /** @var SiteStore */ |
| 21 | private $siteStore; |
| 22 | /** @var BagOStuff */ |
| 23 | private $cache; |
| 24 | /** @var string|null */ |
| 25 | private $cacheKey = null; |
| 26 | /** @var SiteList|null */ |
| 27 | private $sites = null; |
| 28 | |
| 29 | public function __construct( |
| 30 | SiteStore $siteStore, |
| 31 | BagOStuff $cache |
| 32 | ) { |
| 33 | $this->siteStore = $siteStore; |
| 34 | $this->cache = $cache; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Constructs a cache key to use for caching the list of sites. |
| 39 | * |
| 40 | * This includes the concrete class name of the site list as well as a version identifier |
| 41 | * for the list's serialization, to avoid problems when unserializing site lists serialized |
| 42 | * by an older version, e.g. when reading from a cache. |
| 43 | * |
| 44 | * The cache key also includes information about where the sites were loaded from, e.g. |
| 45 | * the name of a database table. |
| 46 | * |
| 47 | * @see SiteList::getSerialVersionId |
| 48 | * |
| 49 | * @return string The cache key. |
| 50 | */ |
| 51 | private function getCacheKey() { |
| 52 | if ( $this->cacheKey === null ) { |
| 53 | $version = SiteList::getSerialVersionId(); |
| 54 | $this->cacheKey = $this->cache->makeKey( 'site-SiteList', $version ); |
| 55 | } |
| 56 | |
| 57 | return $this->cacheKey; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * @see SiteStore::getSites |
| 62 | * |
| 63 | * @since 1.25 |
| 64 | * @return SiteList |
| 65 | */ |
| 66 | public function getSites() { |
| 67 | if ( $this->sites === null ) { |
| 68 | $this->sites = $this->cache->getWithSetCallback( |
| 69 | $this->getCacheKey(), |
| 70 | BagOStuff::TTL_HOUR, |
| 71 | function () { |
| 72 | return $this->siteStore->getSites(); |
| 73 | } |
| 74 | ); |
| 75 | } |
| 76 | |
| 77 | return $this->sites; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * @see SiteStore::getSite |
| 82 | * |
| 83 | * @since 1.25 |
| 84 | * @param string $globalId |
| 85 | * @return Site|null |
| 86 | */ |
| 87 | public function getSite( $globalId ) { |
| 88 | $sites = $this->getSites(); |
| 89 | |
| 90 | return $sites->hasSite( $globalId ) ? $sites->getSite( $globalId ) : null; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * @see SiteStore::saveSite |
| 95 | * |
| 96 | * @since 1.25 |
| 97 | * @param Site $site |
| 98 | * @return bool Success indicator |
| 99 | */ |
| 100 | public function saveSite( Site $site ) { |
| 101 | return $this->saveSites( [ $site ] ); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * @see SiteStore::saveSites |
| 106 | * |
| 107 | * @since 1.25 |
| 108 | * @param Site[] $sites |
| 109 | * @return bool Success indicator |
| 110 | */ |
| 111 | public function saveSites( array $sites ) { |
| 112 | if ( !$sites ) { |
| 113 | return true; |
| 114 | } |
| 115 | |
| 116 | $success = $this->siteStore->saveSites( $sites ); |
| 117 | |
| 118 | // purge cache |
| 119 | $this->reset(); |
| 120 | |
| 121 | return $success; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Purge the internal and external cache of the site list, forcing the list. |
| 126 | * of sites to be reloaded. |
| 127 | * |
| 128 | * @since 1.25 |
| 129 | */ |
| 130 | public function reset() { |
| 131 | $this->cache->delete( $this->getCacheKey() ); |
| 132 | $this->sites = null; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Clears the list of sites stored. |
| 137 | * |
| 138 | * NOTE: The fact that this also clears the in-process cache is an internal |
| 139 | * detail for PHPUnit testing only. The injected cache is generally APCU, |
| 140 | * which is per-server, so the cache reset would not apply to any other web servers. |
| 141 | * |
| 142 | * @see SiteStore::clear() |
| 143 | * @return bool Success |
| 144 | */ |
| 145 | public function clear() { |
| 146 | $this->reset(); |
| 147 | |
| 148 | return $this->siteStore->clear(); |
| 149 | } |
| 150 | |
| 151 | } |
| 152 | |
| 153 | /** @deprecated class alias since 1.42 */ |
| 154 | class_alias( CachingSiteStore::class, 'CachingSiteStore' ); |