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<?php /** * 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 */ namespace MediaWiki\PoolCounter; use InvalidArgumentException; /** * Convenience class for dealing with PoolCounter using callbacks * @since 1.22 * @newable * @note marked as newable in 1.35 for lack of a better alternative, * but should use a factory in the future. */ 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. * * @stable to call * @param string $type The class of actions to limit concurrency for * @param string $key * @param array $callbacks Map of callbacks */ 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 InvalidArgumentException( "Invalid callback provided for '$name' function." ); } $this->$name = $callbacks[$name]; } } if ( !isset( $this->doWork ) ) { throw new InvalidArgumentException( "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( $fast ) { if ( $this->fallback ) { return ( $this->fallback )( $fast ); } return false; } public function error( $status ) { if ( $this->error ) { return ( $this->error )( $status ); } return false; } } /** @deprecated class alias since 1.42 */ class_alias( PoolCounterWorkViaCallback::class, 'PoolCounterWorkViaCallback' );
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