1 files changed, 0 insertions, 263 deletions
diff --git a/includes/job/jobs/HTMLCacheUpdateJob.php b/includes/job/jobs/HTMLCacheUpdateJob.php
deleted file mode 100644
index 44c240bb..00000000
--- a/includes/job/jobs/HTMLCacheUpdateJob.php
+++ /dev/null
@@ -1,263 +0,0 @@
-<?php
-/**
- * HTML cache invalidation of all pages linking to a given title.
- *
- * 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
- * @ingroup Cache
- */
-
-/**
- * Job wrapper for HTMLCacheUpdate. Gets run whenever a related
- * job gets called from the queue.
- *
- * This class is designed to work efficiently with small numbers of links, and
- * to work reasonably well with up to ~10^5 links. Above ~10^6 links, the memory
- * and time requirements of loading all backlinked IDs in doUpdate() might become
- * prohibitive. The requirements measured at Wikimedia are approximately:
- *
- *   memory: 48 bytes per row
- *   time: 16us per row for the query plus processing
- *
- * The reason this query is done is to support partitioning of the job
- * by backlinked ID. The memory issue could be allieviated by doing this query in
- * batches, but of course LIMIT with an offset is inefficient on the DB side.
- *
- * The class is nevertheless a vast improvement on the previous method of using
- * File::getLinksTo() and Title::touchArray(), which uses about 2KB of memory per
- * link.
- *
- * @ingroup JobQueue
- */
-class HTMLCacheUpdateJob extends Job {
-	/** @var BacklinkCache */
-	protected $blCache;
-
-	protected $rowsPerJob, $rowsPerQuery;
-
-	/**
-	 * Construct a job
-	 * @param $title Title: the title linked to
-	 * @param array $params job parameters (table, start and end page_ids)
-	 * @param $id Integer: job id
-	 */
-	function __construct( $title, $params, $id = 0 ) {
-		global $wgUpdateRowsPerJob, $wgUpdateRowsPerQuery;
-
-		parent::__construct( 'htmlCacheUpdate', $title, $params, $id );
-
-		$this->rowsPerJob = $wgUpdateRowsPerJob;
-		$this->rowsPerQuery = $wgUpdateRowsPerQuery;
-		$this->blCache = $title->getBacklinkCache();
-	}
-
-	public function run() {
-		if ( isset( $this->params['start'] ) && isset( $this->params['end'] ) ) {
-			# This is hit when a job is actually performed
-			return $this->doPartialUpdate();
-		} else {
-			# This is hit when the jobs have to be inserted
-			return $this->doFullUpdate();
-		}
-	}
-
-	/**
-	 * Update all of the backlinks
-	 */
-	protected function doFullUpdate() {
-		global $wgMaxBacklinksInvalidate;
-
-		# Get an estimate of the number of rows from the BacklinkCache
-		$max = max( $this->rowsPerJob * 2, $wgMaxBacklinksInvalidate ) + 1;
-		$numRows = $this->blCache->getNumLinks( $this->params['table'], $max );
-		if ( $wgMaxBacklinksInvalidate !== false && $numRows > $wgMaxBacklinksInvalidate ) {
-			wfDebug( "Skipped HTML cache invalidation of {$this->title->getPrefixedText()}." );
-			return true;
-		}
-
-		if ( $numRows > $this->rowsPerJob * 2 ) {
-			# Do fast cached partition
-			$this->insertPartitionJobs();
-		} else {
-			# Get the links from the DB
-			$titleArray = $this->blCache->getLinks( $this->params['table'] );
-			# Check if the row count estimate was correct
-			if ( $titleArray->count() > $this->rowsPerJob * 2 ) {
-				# Not correct, do accurate partition
-				wfDebug( __METHOD__ . ": row count estimate was incorrect, repartitioning\n" );
-				$this->insertJobsFromTitles( $titleArray );
-			} else {
-				$this->invalidateTitles( $titleArray ); // just do the query
-			}
-		}
-
-		return true;
-	}
-
-	/**
-	 * Update some of the backlinks, defined by a page ID range
-	 */
-	protected function doPartialUpdate() {
-		$titleArray = $this->blCache->getLinks(
-			$this->params['table'], $this->params['start'], $this->params['end'] );
-		if ( $titleArray->count() <= $this->rowsPerJob * 2 ) {
-			# This partition is small enough, do the update
-			$this->invalidateTitles( $titleArray );
-		} else {
-			# Partitioning was excessively inaccurate. Divide the job further.
-			# This can occur when a large number of links are added in a short
-			# period of time, say by updating a heavily-used template.
-			$this->insertJobsFromTitles( $titleArray );
-		}
-		return true;
-	}
-
-	/**
-	 * Partition the current range given by $this->params['start'] and $this->params['end'],
-	 * using a pre-calculated title array which gives the links in that range.
-	 * Queue the resulting jobs.
-	 *
-	 * @param $titleArray array
-	 * @param $rootJobParams array
-	 * @return void
-	 */
-	protected function insertJobsFromTitles( $titleArray, $rootJobParams = array() ) {
-		// Carry over any "root job" information
-		$rootJobParams = $this->getRootJobParams();
-		# We make subpartitions in the sense that the start of the first job
-		# will be the start of the parent partition, and the end of the last
-		# job will be the end of the parent partition.
-		$jobs = array();
-		$start = $this->params['start']; # start of the current job
-		$numTitles = 0;
-		foreach ( $titleArray as $title ) {
-			$id = $title->getArticleID();
-			# $numTitles is now the number of titles in the current job not
-			# including the current ID
-			if ( $numTitles >= $this->rowsPerJob ) {
-				# Add a job up to but not including the current ID
-				$jobs[] = new HTMLCacheUpdateJob( $this->title,
-					array(
-						'table' => $this->params['table'],
-						'start' => $start,
-						'end' => $id - 1
-					) + $rootJobParams // carry over information for de-duplication
-				);
-				$start = $id;
-				$numTitles = 0;
-			}
-			$numTitles++;
-		}
-		# Last job
-		$jobs[] = new HTMLCacheUpdateJob( $this->title,
-			array(
-				'table' => $this->params['table'],
-				'start' => $start,
-				'end' => $this->params['end']
-			) + $rootJobParams // carry over information for de-duplication
-		);
-		wfDebug( __METHOD__ . ": repartitioning into " . count( $jobs ) . " jobs\n" );
-
-		if ( count( $jobs ) < 2 ) {
-			# I don't think this is possible at present, but handling this case
-			# makes the code a bit more robust against future code updates and
-			# avoids a potential infinite loop of repartitioning
-			wfDebug( __METHOD__ . ": repartitioning failed!\n" );
-			$this->invalidateTitles( $titleArray );
-		} else {
-			JobQueueGroup::singleton()->push( $jobs );
-		}
-	}
-
-	/**
-	 * @param $rootJobParams array
-	 * @return void
-	 */
-	protected function insertPartitionJobs( $rootJobParams = array() ) {
-		// Carry over any "root job" information
-		$rootJobParams = $this->getRootJobParams();
-
-		$batches = $this->blCache->partition( $this->params['table'], $this->rowsPerJob );
-		if ( !count( $batches ) ) {
-			return; // no jobs to insert
-		}
-
-		$jobs = array();
-		foreach ( $batches as $batch ) {
-			list( $start, $end ) = $batch;
-			$jobs[] = new HTMLCacheUpdateJob( $this->title,
-				array(
-					'table' => $this->params['table'],
-					'start' => $start,
-					'end' => $end,
-				) + $rootJobParams // carry over information for de-duplication
-			);
-		}
-
-		JobQueueGroup::singleton()->push( $jobs );
-	}
-
-	/**
-	 * Invalidate an array (or iterator) of Title objects, right now
-	 * @param $titleArray array
-	 */
-	protected function invalidateTitles( $titleArray ) {
-		global $wgUseFileCache, $wgUseSquid;
-
-		$dbw = wfGetDB( DB_MASTER );
-		$timestamp = $dbw->timestamp();
-
-		# Get all IDs in this query into an array
-		$ids = array();
-		foreach ( $titleArray as $title ) {
-			$ids[] = $title->getArticleID();
-		}
-
-		if ( !$ids ) {
-			return;
-		}
-
-		# Don't invalidated pages that were already invalidated
-		$touchedCond = isset( $this->params['rootJobTimestamp'] )
-			? array( "page_touched < " .
-				$dbw->addQuotes( $dbw->timestamp( $this->params['rootJobTimestamp'] ) ) )
-			: array();
-
-		# Update page_touched
-		$batches = array_chunk( $ids, $this->rowsPerQuery );
-		foreach ( $batches as $batch ) {
-			$dbw->update( 'page',
-				array( 'page_touched' => $timestamp ),
-				array( 'page_id' => $batch ) + $touchedCond,
-				__METHOD__
-			);
-		}
-
-		# Update squid
-		if ( $wgUseSquid ) {
-			$u = SquidUpdate::newFromTitles( $titleArray );
-			$u->doUpdate();
-		}
-
-		# Update file cache
-		if ( $wgUseFileCache ) {
-			foreach ( $titleArray as $title ) {
-				HTMLFileCache::clearFileCache( $title );
-			}
-		}
-	}
-}