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<?php |
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namespace SIL; |
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use Onoi\Cache\Cache; |
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use SMW\DIWikiPage; |
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use Title; |
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/** |
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* To make a page view responsive and avoid a repetitive or exhausting query |
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* process, this class is expected to cache all objects necessary and be |
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* accessible through the `InterlanguageLinksLookup` class. |
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* |
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* It is expected that the cache uses a "Composite" approach in order for short-lived |
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* requests to be stored in-memory while other information are stored on a |
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* persistence layer to increase lookup performance for succeeding requests. |
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* |
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* @license GNU GPL v2+ |
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* @since 1.0 |
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* |
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* @author mwjames |
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*/ |
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class LanguageTargetLinksCache { |
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/** |
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* @var Cache |
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*/ |
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private $cache; |
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/** |
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* @var CacheKeyProvider |
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*/ |
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private $cacheKeyProvider; |
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/** |
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* The current page language cache strategy is to store language by page |
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* into a blob value to avoid high cache fragmentation and keep the cache |
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* lookup performant on generated category/search lists. |
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* |
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* Whether the blob language-page strategy has a considerable performance draw |
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* back on large lists of stored language-page pairs has yet to be determined |
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* but it will be fairly easy to switch to a single language-page strategy |
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* if necessary. |
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* |
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* @var string |
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*/ |
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private $pageLanguageCacheStrategy = 'single'; |
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/** |
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* @since 1.0 |
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* |
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* @param Cache $cache |
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* @param CacheKeyProvider $cacheKeyProvider |
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*/ |
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public function __construct( Cache $cache, CacheKeyProvider $cacheKeyProvider ) { |
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$this->cache = $cache; |
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$this->cacheKeyProvider = $cacheKeyProvider; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param string $pageLanguageCacheStrategy |
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*/ |
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public function setPageLanguageCacheStrategy( $pageLanguageCacheStrategy ) { |
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$this->pageLanguageCacheStrategy = $pageLanguageCacheStrategy; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param Title $title |
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* |
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* @param boolean|string |
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*/ |
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public function getPageLanguageFromCache( Title $title ) { |
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return $this->fetch( $title ); |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param Title $title |
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* @param string $languageCode |
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*/ |
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public function pushPageLanguageToCache( Title $title, $languageCode ) { |
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$normalizedLanguageTargetLink = array( |
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$languageCode => $title->getPrefixedText() |
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); |
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$this->save( $normalizedLanguageTargetLink ); |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param InterlanguageLink $interlanguageLink |
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* |
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* @return boolean|array |
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*/ |
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public function getLanguageTargetLinksFromCache( InterlanguageLink $interlanguageLink ) { |
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// Call to a member function getPrefixedText() on null in ...SemanticInterlanguageLinks/src/LanguageTargetLinksCache.php on line 105 |
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if ( $interlanguageLink->getLinkReference() === null ) { |
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return false; |
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} |
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$cachedLanguageTargetLinks = $this->cache->fetch( |
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$this->cacheKeyProvider->getSiteCacheKey( $interlanguageLink->getLinkReference()->getPrefixedText() ) |
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); |
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if ( $interlanguageLink->getLanguageCode() === null ) { |
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return $cachedLanguageTargetLinks; |
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} |
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if ( !isset( $cachedLanguageTargetLinks[ $interlanguageLink->getLanguageCode() ] ) ) { |
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return false; |
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} |
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return $cachedLanguageTargetLinks; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param InterlanguageLink $interlanguageLink |
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* @param array $languageTargetLinks |
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*/ |
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public function saveLanguageTargetLinksToCache( InterlanguageLink $interlanguageLink, array $languageTargetLinks ) { |
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$normalizedLanguageTargetLinks = array(); |
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foreach ( $languageTargetLinks as $languageCode => $title ) { |
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if ( $title instanceof Title ) { |
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$title = $title->getPrefixedText(); |
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} |
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$normalizedLanguageTargetLinks[ $languageCode ] = $title; |
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} |
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if ( $normalizedLanguageTargetLinks === array() ) { |
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return; |
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} |
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$this->cache->save( |
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$this->cacheKeyProvider->getSiteCacheKey( $interlanguageLink->getLinkReference()->getPrefixedText() ), |
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$normalizedLanguageTargetLinks |
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); |
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$this->save( $normalizedLanguageTargetLinks ); |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param DIWikiPage[] $linkReferences |
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*/ |
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public function deleteLanguageTargetLinksFromCache( array $linkReferences ) { |
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foreach ( $linkReferences as $linkReference ) { |
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if ( !$linkReference instanceof DIWikiPage ) { |
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continue; |
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} |
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$siteCacheKey = $this->cacheKeyProvider->getSiteCacheKey( |
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$linkReference->getTitle()->getPrefixedText() |
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); |
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$cachedLanguageTargetLinks = $this->cache->fetch( $siteCacheKey ); |
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if ( !is_array( $cachedLanguageTargetLinks ) ) { |
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continue; |
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} |
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foreach ( $cachedLanguageTargetLinks as $cachedLanguageTargetLink ) { |
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Title::newFromText( $cachedLanguageTargetLink )->invalidateCache(); |
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} |
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$this->cache->delete( $siteCacheKey ); |
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} |
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return true; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param Title $title |
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*/ |
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public function deletePageLanguageForTargetFromCache( Title $title ) { |
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$this->delete( $title ); |
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} |
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private function fetch( Title $title ) { |
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$pageCacheKey = $this->cacheKeyProvider->getPageCacheKey( |
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$title->getPrefixedText(), |
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$this->pageLanguageCacheStrategy === 'blob' |
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); |
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if ( $this->pageLanguageCacheStrategy !== 'blob' ) { |
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return $this->cache->fetch( $pageCacheKey ); |
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} |
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$pageLanguageCacheBlob = $this->getPageLanguageCacheBlob(); |
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return isset( $pageLanguageCacheBlob[ $pageCacheKey ] ) ? $pageLanguageCacheBlob[ $pageCacheKey ] : false; |
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} |
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private function save( array $normalizedLanguageTargetLinks ) { |
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if ( $this->pageLanguageCacheStrategy !== 'blob' ) { |
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foreach ( $normalizedLanguageTargetLinks as $languageCode => $target ) { |
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$this->cache->save( |
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$this->cacheKeyProvider->getPageCacheKey( $target, false ), |
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$languageCode |
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); |
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} |
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return; |
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} |
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$pageLanguageCacheBlob = $this->getPageLanguageCacheBlob(); |
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foreach ( $normalizedLanguageTargetLinks as $languageCode => $target ) { |
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$pageLanguageCacheBlob[ $this->cacheKeyProvider->getPageCacheKey( $target, true ) ] = $languageCode; |
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} |
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$this->cache->save( |
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$this->cacheKeyProvider->getPageLanguageCacheBlobKey(), |
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$pageLanguageCacheBlob |
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); |
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} |
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private function delete( Title $title ) { |
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if ( $this->pageLanguageCacheStrategy !== 'blob' ) { |
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return $this->cache->delete( |
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$this->cacheKeyProvider->getPageCacheKey( $title->getPrefixedText(), false ) |
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); |
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} |
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$pageLanguageCacheBlob = $this->getPageLanguageCacheBlob(); |
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unset( $pageLanguageCacheBlob[ $this->cacheKeyProvider->getPageCacheKey( $title->getPrefixedText(), true ) ] ); |
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$this->cache->save( |
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$this->cacheKeyProvider->getPageLanguageCacheBlobKey(), |
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$pageLanguageCacheBlob |
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); |
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} |
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private function getPageLanguageCacheBlob() { |
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$pageLanguageCacheBlob = $this->cache->fetch( |
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$this->cacheKeyProvider->getPageLanguageCacheBlobKey() |
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); |
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if ( $pageLanguageCacheBlob === false ) { |
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$pageLanguageCacheBlob = array(); |
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} |
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return $pageLanguageCacheBlob; |
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} |
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} |
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