Current File : //proc/985914/root/www/varak.net/wiki.varak.net/includes/poolcounter/PoolCounterWorkViaCallback.php
<?php
/**
* Provides of semaphore semantics for restricting the number
* of workers that may be concurrently performing the same task.
*
* 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
*/
/**
* Convenience class for dealing with PoolCounters using callbacks
* @since 1.22
*/
class PoolCounterWorkViaCallback extends PoolCounterWork {
/** @var callable */
protected $doWork;
/** @var callable|null */
protected $doCachedWork;
/** @var callable|null */
protected $fallback;
/** @var callable|null */
protected $error;
/**
* Build a PoolCounterWork class from a type, key, and callback map.
*
* The callback map must at least have a callback for the 'doWork' method.
* Additionally, callbacks can be provided for the 'doCachedWork', 'fallback',
* and 'error' methods. Methods without callbacks will be no-ops that return false.
* If a 'doCachedWork' callback is provided, then execute() may wait for any prior
* process in the pool to finish and reuse its cached result.
*
* @param string $type The class of actions to limit concurrency for
* @param string $key
* @param array $callbacks Map of callbacks
* @throws MWException
*/
public function __construct( $type, $key, array $callbacks ) {
parent::__construct( $type, $key );
foreach ( [ 'doWork', 'doCachedWork', 'fallback', 'error' ] as $name ) {
if ( isset( $callbacks[$name] ) ) {
if ( !is_callable( $callbacks[$name] ) ) {
throw new MWException( "Invalid callback provided for '$name' function." );
}
$this->$name = $callbacks[$name];
}
}
if ( !isset( $this->doWork ) ) {
throw new MWException( "No callback provided for 'doWork' function." );
}
$this->cacheable = isset( $this->doCachedWork );
}
public function doWork() {
return ( $this->doWork )();
}
public function getCachedWork() {
if ( $this->doCachedWork ) {
return ( $this->doCachedWork )();
}
return false;
}
public function fallback() {
if ( $this->fallback ) {
return ( $this->fallback )();
}
return false;
}
public function error( $status ) {
if ( $this->error ) {
return ( $this->error )( $status );
}
return false;
}
}
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