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<?php
/**
* Degenerate job that does nothing.
*
* 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
*/
/**
* Degenerate job that does nothing, but can optionally replace itself
* in the queue and/or sleep for a brief time period. These can be used
* to represent "no-op" jobs or test lock contention and performance.
*
* @par Example:
* Inserting a null job in the configured job queue:
* @code
* $ php maintenance/eval.php
* > $queue = JobQueueGroup::singleton();
* > $job = new NullJob( Title::newMainPage(), array( 'lives' => 10 ) );
* > $queue->push( $job );
* @endcode
* You can then confirm the job has been enqueued by using the showJobs.php
* maintenance utility:
* @code
* $ php maintenance/showJobs.php --group
* null: 1 queue; 0 claimed (0 active, 0 abandoned)
* $
* @endcode
*
* @ingroup JobQueue
*/
class NullJob extends Job {
/**
* @param Title $title
* @param array $params Job parameters (lives, usleep)
*/
function __construct( $title, $params ) {
parent::__construct( 'null', $title, $params );
if ( !isset( $this->params['lives'] ) ) {
$this->params['lives'] = 1;
}
if ( !isset( $this->params['usleep'] ) ) {
$this->params['usleep'] = 0;
}
$this->removeDuplicates = !empty( $this->params['removeDuplicates'] );
}
public function run() {
if ( $this->params['usleep'] > 0 ) {
usleep( $this->params['usleep'] );
}
if ( $this->params['lives'] > 1 ) {
$params = $this->params;
$params['lives']--;
$job = new self( $this->title, $params );
JobQueueGroup::singleton()->push( $job );
}
return true;
}
}
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