Update to MediaWiki 1.21.1

1 files changed, 0 insertions, 419 deletions

diff --git a/includes/BacklinkCache.php b/includes/BacklinkCache.php
deleted file mode 100644
index 05bf3186..00000000
--- a/includes/BacklinkCache.php
+++ /dev/null
@@ -1,419 +0,0 @@
-<?php
-/**
- * Class for fetching backlink lists, approximate backlink counts and
- * partitions.
- *
- * 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
- * @author Tim Starling
- * @copyright © 2009, Tim Starling, Domas Mituzas
- * @copyright © 2010, Max Sem
- * @copyright © 2011, Antoine Musso
- */
-
-/**
- * Class for fetching backlink lists, approximate backlink counts and
- * partitions. This is a shared cache.
- *
- * Instances of this class should typically be fetched with the method
- * $title->getBacklinkCache().
- *
- * Ideally you should only get your backlinks from here when you think
- * there is some advantage in caching them. Otherwise it's just a waste
- * of memory.
- *
- * Introduced by r47317
- *
- * @internal documentation reviewed on 18 Mar 2011 by hashar
- */
-class BacklinkCache {
-	/** @var ProcessCacheLRU */
-	protected static $cache;
-
-	/**
-	 * Multi dimensions array representing batches. Keys are:
-	 *  > (string) links table name
-	 *    > 'numRows' : Number of rows for this link table
-	 *    > 'batches' : array( $start, $end )
-	 *
-	 * @see BacklinkCache::partitionResult()
-	 *
-	 * Cleared with BacklinkCache::clear()
-	 */
-	protected $partitionCache = array();
-
-	/**
-	 * Contains the whole links from a database result.
-	 * This is raw data that will be partitioned in $partitionCache
-	 *
-	 * Initialized with BacklinkCache::getLinks()
-	 * Cleared with BacklinkCache::clear()
-	 */
-	protected $fullResultCache = array();
-
-	/**
-	 * Local copy of a database object.
-	 *
-	 * Accessor: BacklinkCache::getDB()
-	 * Mutator : BacklinkCache::setDB()
-	 * Cleared with BacklinkCache::clear()
-	 */
-	protected $db;
-
-	/**
-	 * Local copy of a Title object
-	 */
-	protected $title;
-
-	const CACHE_EXPIRY = 3600;
-
-	/**
-	 * Create a new BacklinkCache
-	 *
-	 * @param Title $title : Title object to create a backlink cache for
-	 */
-	public function __construct( Title $title ) {
-		$this->title = $title;
-	}
-
-	/**
-	 * Create a new BacklinkCache or reuse any existing one.
-	 * Currently, only one cache instance can exist; callers that
-	 * need multiple backlink cache objects should keep them in scope.
-	 *
-	 * @param Title $title : Title object to get a backlink cache for
-	 * @return BacklinkCache
-	 */
-	public static function get( Title $title ) {
-		if ( !self::$cache ) { // init cache
-			self::$cache = new ProcessCacheLRU( 1 );
-		}
-		$dbKey = $title->getPrefixedDBkey();
-		if ( !self::$cache->has( $dbKey, 'obj' ) ) {
-			self::$cache->set( $dbKey, 'obj', new self( $title ) );
-		}
-		return self::$cache->get( $dbKey, 'obj' );
-	}
-
-	/**
-	 * Serialization handler, diasallows to serialize the database to prevent
-	 * failures after this class is deserialized from cache with dead DB
-	 * connection.
-	 *
-	 * @return array
-	 */
-	function __sleep() {
-		return array( 'partitionCache', 'fullResultCache', 'title' );
-	}
-
-	/**
-	 * Clear locally stored data and database object.
-	 */
-	public function clear() {
-		$this->partitionCache = array();
-		$this->fullResultCache = array();
-		unset( $this->db );
-	}
-
-	/**
-	 * Set the Database object to use
-	 *
-	 * @param $db DatabaseBase
-	 */
-	public function setDB( $db ) {
-		$this->db = $db;
-	}
-
-	/**
-	 * Get the slave connection to the database
-	 * When non existing, will initialize the connection.
-	 * @return DatabaseBase object
-	 */
-	protected function getDB() {
-		if ( !isset( $this->db ) ) {
-			$this->db = wfGetDB( DB_SLAVE );
-		}
-
-		return $this->db;
-	}
-
-	/**
-	 * Get the backlinks for a given table. Cached in process memory only.
-	 * @param $table String
-	 * @param $startId Integer or false
-	 * @param $endId Integer or false
-	 * @return TitleArrayFromResult
-	 */
-	public function getLinks( $table, $startId = false, $endId = false ) {
-		wfProfileIn( __METHOD__ );
-
-		$fromField = $this->getPrefix( $table ) . '_from';
-
-		if ( $startId || $endId ) {
-			// Partial range, not cached
-			wfDebug( __METHOD__ . ": from DB (uncacheable range)\n" );
-			$conds = $this->getConditions( $table );
-
-			// Use the from field in the condition rather than the joined page_id,
-			// because databases are stupid and don't necessarily propagate indexes.
-			if ( $startId ) {
-				$conds[] = "$fromField >= " . intval( $startId );
-			}
-
-			if ( $endId ) {
-				$conds[] = "$fromField <= " . intval( $endId );
-			}
-
-			$res = $this->getDB()->select(
-				array( $table, 'page' ),
-				array( 'page_namespace', 'page_title', 'page_id' ),
-				$conds,
-				__METHOD__,
-				array(
-					'STRAIGHT_JOIN',
-					'ORDER BY' => $fromField
-				) );
-			$ta = TitleArray::newFromResult( $res );
-
-			wfProfileOut( __METHOD__ );
-			return $ta;
-		}
-
-		// @todo FIXME: Make this a function?
-		if ( !isset( $this->fullResultCache[$table] ) ) {
-			wfDebug( __METHOD__ . ": from DB\n" );
-			$res = $this->getDB()->select(
-				array( $table, 'page' ),
-				array( 'page_namespace', 'page_title', 'page_id' ),
-				$this->getConditions( $table ),
-				__METHOD__,
-				array(
-					'STRAIGHT_JOIN',
-					'ORDER BY' => $fromField,
-				) );
-			$this->fullResultCache[$table] = $res;
-		}
-
-		$ta = TitleArray::newFromResult( $this->fullResultCache[$table] );
-
-		wfProfileOut( __METHOD__ );
-		return $ta;
-	}
-
-	/**
-	 * Get the field name prefix for a given table
-	 * @param $table String
-	 * @return null|string
-	 */
-	protected function getPrefix( $table ) {
-		static $prefixes = array(
-			'pagelinks'     => 'pl',
-			'imagelinks'    => 'il',
-			'categorylinks' => 'cl',
-			'templatelinks' => 'tl',
-			'redirect'      => 'rd',
-		);
-
-		if ( isset( $prefixes[$table] ) ) {
-			return $prefixes[$table];
-		} else {
-			$prefix = null;
-			wfRunHooks( 'BacklinkCacheGetPrefix', array( $table, &$prefix ) );
-			if( $prefix ) {
-				return $prefix;
-			} else {
-				throw new MWException( "Invalid table \"$table\" in " . __CLASS__ );
-			}
-		}
-	}
-
-	/**
-	 * Get the SQL condition array for selecting backlinks, with a join
-	 * on the page table.
-	 * @param $table String
-	 * @return array|null
-	 */
-	protected function getConditions( $table ) {
-		$prefix = $this->getPrefix( $table );
-
-		// @todo FIXME: imagelinks and categorylinks do not rely on getNamespace,
-		// they could be moved up for nicer case statements
-		switch ( $table ) {
-			case 'pagelinks':
-			case 'templatelinks':
-				$conds = array(
-					"{$prefix}_namespace" => $this->title->getNamespace(),
-					"{$prefix}_title"     => $this->title->getDBkey(),
-					"page_id={$prefix}_from"
-				);
-				break;
-			case 'redirect':
-				$conds = array(
-					"{$prefix}_namespace" => $this->title->getNamespace(),
-					"{$prefix}_title"     => $this->title->getDBkey(),
-					$this->getDb()->makeList( array(
-						"{$prefix}_interwiki = ''",
-						"{$prefix}_interwiki is null",
-					), LIST_OR ),
-					"page_id={$prefix}_from"
-				);
-				break;
-			case 'imagelinks':
-				$conds = array(
-					'il_to' => $this->title->getDBkey(),
-					'page_id=il_from'
-				);
-				break;
-			case 'categorylinks':
-				$conds = array(
-					'cl_to' => $this->title->getDBkey(),
-					'page_id=cl_from',
-				);
-				break;
-			default:
-				$conds = null;
-				wfRunHooks( 'BacklinkCacheGetConditions', array( $table, $this->title, &$conds ) );
-				if( !$conds )
-					throw new MWException( "Invalid table \"$table\" in " . __CLASS__ );
-		}
-
-		return $conds;
-	}
-
-	/**
-	 * Get the approximate number of backlinks
-	 * @param $table String
-	 * @return integer
-	 */
-	public function getNumLinks( $table ) {
-		if ( isset( $this->fullResultCache[$table] ) ) {
-			return $this->fullResultCache[$table]->numRows();
-		}
-
-		if ( isset( $this->partitionCache[$table] ) ) {
-			$entry = reset( $this->partitionCache[$table] );
-			return $entry['numRows'];
-		}
-
-		$titleArray = $this->getLinks( $table );
-
-		return $titleArray->count();
-	}
-
-	/**
-	 * Partition the backlinks into batches.
-	 * Returns an array giving the start and end of each range. The first
-	 * batch has a start of false, and the last batch has an end of false.
-	 *
-	 * @param $table String: the links table name
-	 * @param $batchSize Integer
-	 * @return Array
-	 */
-	public function partition( $table, $batchSize ) {
-
-		// 1) try partition cache ...
-
-		if ( isset( $this->partitionCache[$table][$batchSize] ) ) {
-			wfDebug( __METHOD__ . ": got from partition cache\n" );
-			return $this->partitionCache[$table][$batchSize]['batches'];
-		}
-
-		$this->partitionCache[$table][$batchSize] = false;
-		$cacheEntry =& $this->partitionCache[$table][$batchSize];
-
-		// 2) ... then try full result cache ...
-
-		if ( isset( $this->fullResultCache[$table] ) ) {
-			$cacheEntry = $this->partitionResult( $this->fullResultCache[$table], $batchSize );
-			wfDebug( __METHOD__ . ": got from full result cache\n" );
-
-			return $cacheEntry['batches'];
-		}
-
-		// 3) ... fallback to memcached ...
-
-		global $wgMemc;
-
-		$memcKey = wfMemcKey(
-			'backlinks',
-			md5( $this->title->getPrefixedDBkey() ),
-			$table,
-			$batchSize
-		);
-
-		$memcValue = $wgMemc->get( $memcKey );
-
-		if ( is_array( $memcValue ) ) {
-			$cacheEntry = $memcValue;
-			wfDebug( __METHOD__ . ": got from memcached $memcKey\n" );
-
-			return $cacheEntry['batches'];
-		}
-
-
-		// 4) ... finally fetch from the slow database :(
-
-		$this->getLinks( $table );
-		$cacheEntry = $this->partitionResult( $this->fullResultCache[$table], $batchSize );
-		// Save to memcached
-		$wgMemc->set( $memcKey, $cacheEntry, self::CACHE_EXPIRY );
-
-		wfDebug( __METHOD__ . ": got from database\n" );
-		return $cacheEntry['batches'];
-	}
-
-	/**
-	 * Partition a DB result with backlinks in it into batches
-	 * @param $res ResultWrapper database result
-	 * @param $batchSize integer
-	 * @return array @see
-	 */
-	protected function partitionResult( $res, $batchSize ) {
-		$batches = array();
-		$numRows = $res->numRows();
-		$numBatches = ceil( $numRows / $batchSize );
-
-		for ( $i = 0; $i < $numBatches; $i++ ) {
-			if ( $i == 0  ) {
-				$start = false;
-			} else {
-				$rowNum = intval( $numRows * $i / $numBatches );
-				$res->seek( $rowNum );
-				$row = $res->fetchObject();
-				$start = $row->page_id;
-			}
-
-			if ( $i == $numBatches - 1 ) {
-				$end = false;
-			} else {
-				$rowNum = intval( $numRows * ( $i + 1 ) / $numBatches );
-				$res->seek( $rowNum );
-				$row = $res->fetchObject();
-				$end = $row->page_id - 1;
-			}
-
-			# Sanity check order
-			if ( $start && $end && $start > $end ) {
-				throw new MWException( __METHOD__ . ': Internal error: query result out of order' );
-			}
-
-			$batches[] = array( $start, $end );
-		}
-
-		return array( 'numRows' => $numRows, 'batches' => $batches );
-	}
-}