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<?php
/**
* Job queue base code.
*
* 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
* @defgroup JobQueue JobQueue
*/
/**
* Class to both describe a background job and handle jobs.
* The queue aspects of this class are now deprecated.
*
* @ingroup JobQueue
*/
abstract class Job {
/**
* @var Title
*/
var $title;
var $command,
$params,
$id,
$removeDuplicates,
$error;
/** @var Array Additional queue metadata */
public $metadata = array();
/*-------------------------------------------------------------------------
* Abstract functions
*------------------------------------------------------------------------*/
/**
* Run the job
* @return boolean success
*/
abstract public function run();
/*-------------------------------------------------------------------------
* Static functions
*------------------------------------------------------------------------*/
/**
* Create the appropriate object to handle a specific job
*
* @param string $command Job command
* @param $title Title: Associated title
* @param array|bool $params Job parameters
* @param int $id Job identifier
* @throws MWException
* @return Job
*/
public static function factory( $command, Title $title, $params = false, $id = 0 ) {
global $wgJobClasses;
if( isset( $wgJobClasses[$command] ) ) {
$class = $wgJobClasses[$command];
return new $class( $title, $params, $id );
}
throw new MWException( "Invalid job command `{$command}`" );
}
/**
* 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 array $jobs of Job objects
* @return bool
* @deprecated 1.21
*/
public static function batchInsert( $jobs ) {
return JobQueueGroup::singleton()->push( $jobs );
}
/**
* Insert a group of jobs into the queue.
*
* Same as batchInsert() but does not commit and can thus
* be rolled-back as part of a larger transaction. However,
* large batches of jobs can cause slave lag.
*
* @param array $jobs of Job objects
* @return bool
* @deprecated 1.21
*/
public static function safeBatchInsert( $jobs ) {
return JobQueueGroup::singleton()->push( $jobs, JobQueue::QoS_Atomic );
}
/**
* Pop a job of a certain type. This tries less hard than pop() to
* actually find a job; it may be adversely affected by concurrent job
* runners.
*
* @param $type string
* @return Job|bool Returns false if there are no jobs
* @deprecated 1.21
*/
public static function pop_type( $type ) {
return JobQueueGroup::singleton()->get( $type )->pop();
}
/**
* Pop a job off the front of the queue.
* This is subject to $wgJobTypesExcludedFromDefaultQueue.
*
* @return Job or false if there's no jobs
* @deprecated 1.21
*/
public static function pop() {
return JobQueueGroup::singleton()->pop();
}
/*-------------------------------------------------------------------------
* Non-static functions
*------------------------------------------------------------------------*/
/**
* @param $command
* @param $title
* @param $params array|bool
* @param $id int
*/
public function __construct( $command, $title, $params = false, $id = 0 ) {
$this->command = $command;
$this->title = $title;
$this->params = $params;
$this->id = $id;
$this->removeDuplicates = false; // expensive jobs may set this to true
}
/**
* @return integer May be 0 for jobs stored outside the DB
*/
public function getId() {
return $this->id;
}
/**
* @return string
*/
public function getType() {
return $this->command;
}
/**
* @return Title
*/
public function getTitle() {
return $this->title;
}
/**
* @return array
*/
public function getParams() {
return $this->params;
}
/**
* @return bool Whether only one of each identical set of jobs should be run
*/
public function ignoreDuplicates() {
return $this->removeDuplicates;
}
/**
* @return bool Whether this job can be retried on failure by job runners
*/
public function allowRetries() {
return true;
}
/**
* Subclasses may need to override this to make duplication detection work
*
* @return Array Map of key/values
*/
public function getDeduplicationInfo() {
$info = array(
'type' => $this->getType(),
'namespace' => $this->getTitle()->getNamespace(),
'title' => $this->getTitle()->getDBkey(),
'params' => $this->getParams()
);
// Identical jobs with different "root" jobs should count as duplicates
if ( is_array( $info['params'] ) ) {
unset( $info['params']['rootJobSignature'] );
unset( $info['params']['rootJobTimestamp'] );
}
return $info;
}
/**
* @param string $key A key that identifies the task
* @return Array
*/
public static function newRootJobParams( $key ) {
return array(
'rootJobSignature' => sha1( $key ),
'rootJobTimestamp' => wfTimestampNow()
);
}
/**
* @return Array
*/
public function getRootJobParams() {
return array(
'rootJobSignature' => isset( $this->params['rootJobSignature'] )
? $this->params['rootJobSignature']
: null,
'rootJobTimestamp' => isset( $this->params['rootJobTimestamp'] )
? $this->params['rootJobTimestamp']
: null
);
}
/**
* Insert a single job into the queue.
* @return bool true on success
* @deprecated 1.21
*/
public function insert() {
return JobQueueGroup::singleton()->push( $this );
}
/**
* @return string
*/
public function toString() {
$paramString = '';
if ( $this->params ) {
foreach ( $this->params as $key => $value ) {
if ( $paramString != '' ) {
$paramString .= ' ';
}
if ( is_array( $value ) ) {
$value = "array(" . count( $value ) . ")";
} elseif ( is_object( $value ) && !method_exists( $value, '__toString' ) ) {
$value = "object(" . get_class( $value ) . ")";
}
$value = (string)$value;
if ( mb_strlen( $value ) > 1024 ) {
$value = "string(" . mb_strlen( $value ) . ")";
}
$paramString .= "$key=$value";
}
}
if ( is_object( $this->title ) ) {
$s = "{$this->command} " . $this->title->getPrefixedDBkey();
if ( $paramString !== '' ) {
$s .= ' ' . $paramString;
}
return $s;
} else {
return "{$this->command} $paramString";
}
}
protected function setLastError( $error ) {
$this->error = $error;
}
public function getLastError() {
return $this->error;
}
}