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<?php /** * A RevisionStoreRecord loaded from the cache. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ namespace MediaWiki\Revision; use MediaWiki\CommentStore\CommentStoreComment; use MediaWiki\Page\PageIdentity; use MediaWiki\Permissions\Authority; use MediaWiki\User\UserIdentity; /** * A cached RevisionStoreRecord. Ensures that changes performed "behind the back" * of the cache do not cause the revision record to deliver stale data. * * @internal * @since 1.33 */ class RevisionStoreCacheRecord extends RevisionStoreRecord { /** * @var null|callable ( int $revId ): [ int $rev_deleted, UserIdentity $user ] */ private $mCallback; /** * @note Avoid calling this constructor directly. Use the appropriate methods * in RevisionStore instead. * * @param callable $callback Callback for loading data. * Signature: function ( int $revId ): [ int $rev_deleted, UserIdentity $user ] * @param PageIdentity $page The page this RevisionRecord is associated with. * @param UserIdentity $user * @param CommentStoreComment $comment * @param \stdClass $row A row from the revision table. Use RevisionStore::getQueryInfo() to build * a query that yields the required fields. * @param RevisionSlots $slots The slots of this revision. * @param false|string $wikiID Relevant wiki id or self::LOCAL for the current one. */ public function __construct( callable $callback, PageIdentity $page, UserIdentity $user, CommentStoreComment $comment, $row, RevisionSlots $slots, $wikiID = self::LOCAL ) { parent::__construct( $page, $user, $comment, $row, $slots, $wikiID ); $this->mCallback = $callback; } /** * Overridden to ensure that we return a fresh value and not a cached one. * * @return int */ public function getVisibility() { if ( $this->mCallback ) { $this->loadFreshRow(); } return parent::getVisibility(); } /** * Overridden to ensure that we return a fresh value and not a cached one. * * @param int $audience * @param Authority|null $performer * * @return UserIdentity The identity of the revision author, null if access is forbidden. */ public function getUser( $audience = self::FOR_PUBLIC, ?Authority $performer = null ) { if ( $this->mCallback ) { $this->loadFreshRow(); } return parent::getUser( $audience, $performer ); } /** * Load a fresh row from the database to ensure we return updated information * * @throws RevisionAccessException if the row could not be loaded */ private function loadFreshRow() { [ $freshRevDeleted, $freshUser ] = call_user_func( $this->mCallback, $this->mId ); // Set to null to ensure we do not make unnecessary queries for subsequent getter calls, // and to allow the closure to be freed. $this->mCallback = null; if ( $freshRevDeleted !== null && $freshUser !== null ) { $this->mDeleted = intval( $freshRevDeleted ); $this->mUser = $freshUser; } else { throw new RevisionAccessException( 'Unable to load fresh row for rev_id: {rev_id}', [ 'rev_id' => $this->mId ] ); } } }
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