MediaWiki 1.7.1 wiederhergestellt

1 files changed, 267 insertions, 0 deletions

diff --git a/includes/JobQueue.php b/includes/JobQueue.php
new file mode 100644
index 00000000..746cf5de
--- /dev/null
+++ b/includes/JobQueue.php
@@ -0,0 +1,267 @@
+<?php
+
+if ( !defined( 'MEDIAWIKI' ) ) {
+	die( "This file is part of MediaWiki, it is not a valid entry point\n" );
+}
+
+abstract class Job {
+	var $command,
+		$title,
+		$params,
+		$id,
+		$removeDuplicates,
+		$error;
+
+	/*-------------------------------------------------------------------------
+	 * Static functions
+	 *------------------------------------------------------------------------*/
+
+	/** 
+	 * @deprecated use LinksUpdate::queueRecursiveJobs()
+	 */
+	/**
+	 * static function queueLinksJobs( $titles ) {}
+	 */
+
+	/**
+	 * Pop a job off the front of the queue
+	 * @static
+	 * @return Job or false if there's no jobs
+	 */
+	static function pop() {
+		wfProfileIn( __METHOD__ );
+
+		$dbr =& wfGetDB( DB_SLAVE );
+
+		// Get a job from the slave
+		$row = $dbr->selectRow( 'job', '*', '', __METHOD__,
+			array( 'ORDER BY' => 'job_id', 'LIMIT' => 1 )
+		);
+
+		if ( $row === false ) {
+			wfProfileOut( __METHOD__ );
+			return false;
+		}
+
+		// Try to delete it from the master
+		$dbw =& wfGetDB( DB_MASTER );
+		$dbw->delete( 'job', array( 'job_id' => $row->job_id ), __METHOD__ );
+		$affected = $dbw->affectedRows();
+		$dbw->immediateCommit();
+
+		if ( !$affected ) {
+			// Failed, someone else beat us to it
+			// Try getting a random row
+			$row = $dbw->selectRow( 'job', array( 'MIN(job_id) as minjob',
+				'MAX(job_id) as maxjob' ), '', __METHOD__ );
+			if ( $row === false || is_null( $row->minjob ) || is_null( $row->maxjob ) ) {
+				// No jobs to get
+				wfProfileOut( __METHOD__ );
+				return false;
+			}
+			// Get the random row
+			$row = $dbw->selectRow( 'job', '*',
+				array( 'job_id' => mt_rand( $row->minjob, $row->maxjob ) ),	__METHOD__ );
+			if ( $row === false ) {
+				// Random job gone before we got the chance to select it
+				// Give up
+				wfProfileOut( __METHOD__ );
+				return false;
+			}
+			// Delete the random row
+			$dbw->delete( 'job', array( 'job_id' => $row->job_id ), __METHOD__ );
+			$affected = $dbw->affectedRows();
+			$dbw->immediateCommit();
+			
+			if ( !$affected ) {
+				// Random job gone before we exclusively deleted it
+				// Give up
+				wfProfileOut( __METHOD__ );
+				return false;
+			}
+		}
+		
+		// If execution got to here, there's a row in $row that has been deleted from the database
+		// by this thread. Hence the concurrent pop was successful.
+		$namespace = $row->job_namespace;
+		$dbkey = $row->job_title;
+		$title = Title::makeTitleSafe( $namespace, $dbkey );
+		$job = Job::factory( $row->job_cmd, $title, Job::extractBlob( $row->job_params ), $row->job_id );
+		
+		// Remove any duplicates it may have later in the queue
+		$dbw->delete( 'job', $job->insertFields(), __METHOD__ );
+		
+		wfProfileOut( __METHOD__ );
+		return $job;
+	}
+
+	/** 
+	 * Create an object of a subclass
+	 */
+	static function factory( $command, $title, $params = false, $id = 0 ) {
+		switch ( $command ) {
+			case 'refreshLinks':
+				return new RefreshLinksJob( $title, $params, $id );
+			case 'htmlCacheUpdate':
+			case 'html_cache_update': # BC
+				return new HTMLCacheUpdateJob( $title, $params['table'], $params['start'], $params['end'], $id );
+			default:
+				throw new MWException( "Invalid job command \"$command\"" );
+		}
+	}
+
+	static function makeBlob( $params ) {
+		if ( $params !== false ) {
+			return serialize( $params );
+		} else {
+			return '';
+		}
+	}
+
+	static function extractBlob( $blob ) {
+		if ( (string)$blob !== '' ) {
+			return unserialize( $blob );
+		} else {
+			return false;
+		}
+	}
+
+	/*-------------------------------------------------------------------------
+	 * Non-static functions
+	 *------------------------------------------------------------------------*/
+
+	function __construct( $command, $title, $params = false, $id = 0 ) {
+		$this->command = $command;
+		$this->title = $title;
+		$this->params = $params;
+		$this->id = $id;
+
+		// A bit of premature generalisation
+		// Oh well, the whole class is premature generalisation really
+		$this->removeDuplicates = true;
+	}
+
+	/**
+	 * Insert a single job into the queue.
+	 */
+	function insert() {
+		$fields = $this->insertFields();
+
+		$dbw =& wfGetDB( DB_MASTER );
+		
+		if ( $this->removeDuplicates ) {
+			$res = $dbw->select( 'job', array( '1' ), $fields, __METHOD__ );
+			if ( $dbw->numRows( $res ) ) {
+				return;
+			}
+		}
+		$fields['job_id'] = $dbw->nextSequenceValue( 'job_job_id_seq' );
+		$dbw->insert( 'job', $fields, __METHOD__ );
+	}
+	
+	protected function insertFields() {
+		return array(
+			'job_cmd' => $this->command,
+			'job_namespace' => $this->title->getNamespace(),
+			'job_title' => $this->title->getDBkey(),
+			'job_params' => Job::makeBlob( $this->params )
+		);
+	}
+	
+	/**
+	 * Batch-insert a group of jobs into the queue.
+	 * This will be wrapped in a transaction with a forced commit.
+	 *
+	 * This may add duplicate at insert time, but they will be
+	 * removed later on, when the first one is popped.
+	 *
+	 * @param $jobs array of Job objects
+	 */
+	static function batchInsert( $jobs ) {
+		if( count( $jobs ) ) {
+			$dbw = wfGetDB( DB_MASTER );
+			$dbw->begin();
+			foreach( $jobs as $job ) {
+				$rows[] = $job->insertFields();
+			}
+			$dbw->insert( 'job', $rows, __METHOD__, 'IGNORE' );
+			$dbw->commit();
+		}
+	}
+
+	/**
+	 * Run the job
+	 * @return boolean success
+	 */
+	abstract function run();
+	
+	function toString() {
+		$paramString = '';
+		if ( $this->params ) {
+			foreach ( $this->params as $key => $value ) {
+				if ( $paramString != '' ) {
+					$paramString .= ' ';
+				}
+				$paramString .= "$key=$value";
+			}
+		}
+
+		if ( is_object( $this->title ) ) {
+			$s = "{$this->command} " . $this->title->getPrefixedDBkey();
+			if ( $paramString !== '' ) {
+				$s .= ' ' . $paramString;
+			}
+			return $s;
+		} else {
+			return "{$this->command} $paramString";
+		}
+	}
+
+	function getLastError() {
+		return $this->error;
+	}
+}
+
+class RefreshLinksJob extends Job {
+	function __construct( $title, $params = '', $id = 0 ) {
+		parent::__construct( 'refreshLinks', $title, $params, $id );
+	}
+
+	/**
+	 * Run a refreshLinks job
+	 * @return boolean success
+	 */
+	function run() {
+		global $wgParser;
+		wfProfileIn( __METHOD__ );
+
+		$linkCache =& LinkCache::singleton();
+		$linkCache->clear();
+		
+		if ( is_null( $this->title ) ) {
+			$this->error = "refreshLinks: Invalid title";
+			wfProfileOut( __METHOD__ );
+			return false;
+		}
+
+		$revision = Revision::newFromTitle( $this->title );
+		if ( !$revision ) {
+			$this->error = 'refreshLinks: Article not found "' . $this->title->getPrefixedDBkey() . '"';
+			wfProfileOut( __METHOD__ );
+			return false;
+		}
+
+		wfProfileIn( __METHOD__.'-parse' );
+		$options = new ParserOptions;
+		$parserOutput = $wgParser->parse( $revision->getText(), $this->title, $options, true, true, $revision->getId() );
+		wfProfileOut( __METHOD__.'-parse' );
+		wfProfileIn( __METHOD__.'-update' );
+		$update = new LinksUpdate( $this->title, $parserOutput, false );
+		$update->doUpdate();
+		wfProfileOut( __METHOD__.'-update' );
+		wfProfileOut( __METHOD__ );
+		return true;
+	}
+}
+
+?>