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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace MediaWiki\Specials; |
| 8 | |
| 9 | use MediaWiki\Deferred\LinksUpdate\PageLinksTable; |
| 10 | use MediaWiki\Languages\LanguageConverterFactory; |
| 11 | use MediaWiki\Page\LinkBatchFactory; |
| 12 | use MediaWiki\SpecialPage\PageQueryPage; |
| 13 | use MediaWiki\Title\NamespaceInfo; |
| 14 | use Wikimedia\Rdbms\IConnectionProvider; |
| 15 | |
| 16 | /** |
| 17 | * List of pages that contain no links to other pages. |
| 18 | * |
| 19 | * @ingroup SpecialPage |
| 20 | */ |
| 21 | class SpecialDeadendPages extends PageQueryPage { |
| 22 | |
| 23 | private NamespaceInfo $namespaceInfo; |
| 24 | |
| 25 | public function __construct( |
| 26 | NamespaceInfo $namespaceInfo, |
| 27 | IConnectionProvider $dbProvider, |
| 28 | LinkBatchFactory $linkBatchFactory, |
| 29 | LanguageConverterFactory $languageConverterFactory |
| 30 | ) { |
| 31 | parent::__construct( 'Deadendpages' ); |
| 32 | $this->namespaceInfo = $namespaceInfo; |
| 33 | $this->setDatabaseProvider( $dbProvider ); |
| 34 | $this->setLinkBatchFactory( $linkBatchFactory ); |
| 35 | $this->setLanguageConverter( $languageConverterFactory->getLanguageConverter( $this->getContentLanguage() ) ); |
| 36 | } |
| 37 | |
| 38 | /** @inheritDoc */ |
| 39 | protected function getPageHeader() { |
| 40 | return $this->msg( 'deadendpagestext' )->parseAsBlock(); |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * LEFT JOIN is expensive |
| 45 | * |
| 46 | * @return bool |
| 47 | */ |
| 48 | public function isExpensive() { |
| 49 | return true; |
| 50 | } |
| 51 | |
| 52 | /** @inheritDoc */ |
| 53 | public function isSyndicated() { |
| 54 | return false; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * @return bool |
| 59 | */ |
| 60 | protected function sortDescending() { |
| 61 | return false; |
| 62 | } |
| 63 | |
| 64 | /** @inheritDoc */ |
| 65 | public function getQueryInfo() { |
| 66 | return [ |
| 67 | 'tables' => [ 'page', 'pagelinks' ], |
| 68 | 'fields' => [ |
| 69 | 'namespace' => 'page_namespace', |
| 70 | 'title' => 'page_title', |
| 71 | ], |
| 72 | 'conds' => [ |
| 73 | 'pl_from' => null, |
| 74 | 'page_namespace' => $this->namespaceInfo->getContentNamespaces(), |
| 75 | 'page_is_redirect' => 0 |
| 76 | ], |
| 77 | 'join_conds' => [ |
| 78 | 'pagelinks' => [ |
| 79 | 'LEFT JOIN', |
| 80 | [ 'page_id=pl_from' ] |
| 81 | ] |
| 82 | ] |
| 83 | ]; |
| 84 | } |
| 85 | |
| 86 | /** @inheritDoc */ |
| 87 | protected function getRecacheDB() { |
| 88 | return $this->getDatabaseProvider()->getReplicaDatabase( |
| 89 | PageLinksTable::VIRTUAL_DOMAIN, |
| 90 | 'vslow' |
| 91 | ); |
| 92 | } |
| 93 | |
| 94 | /** @inheritDoc */ |
| 95 | protected function getOrderFields() { |
| 96 | // For some crazy reason ordering by a constant |
| 97 | // causes a filesort |
| 98 | if ( count( $this->namespaceInfo->getContentNamespaces() ) > 1 ) { |
| 99 | return [ 'page_namespace', 'page_title' ]; |
| 100 | } else { |
| 101 | return [ 'page_title' ]; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /** @inheritDoc */ |
| 106 | protected function getGroupName() { |
| 107 | return 'maintenance'; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /** @deprecated class alias since 1.41 */ |
| 112 | class_alias( SpecialDeadendPages::class, 'SpecialDeadendPages' ); |