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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 */ use Wikimedia\AtEase\AtEase; /** * Depend on a file. * * @newable * @ingroup Language */ class FileDependency extends CacheDependency { /** @var string */ private $filename; /** @var null|false|int */ private $timestamp; /** * Create a file dependency * * @stable to call * * @param string $filename The name of the file, preferably fully qualified * @param null|false|int $timestamp The unix last modified timestamp, or false if the * file does not exist. If omitted, the timestamp will be loaded from * the file. * * A dependency on a nonexistent file will be triggered when the file is * created. A dependency on an existing file will be triggered when the * file is changed. */ public function __construct( $filename, $timestamp = null ) { $this->filename = $filename; $this->timestamp = $timestamp; } /** * @return array */ public function __sleep() { $this->loadDependencyValues(); return [ 'filename', 'timestamp' ]; } public function loadDependencyValues() { if ( $this->timestamp === null ) { AtEase::suppressWarnings(); # Dependency on a non-existent file stores "false" # This is a valid concept! $this->timestamp = filemtime( $this->filename ); AtEase::restoreWarnings(); } } public function isExpired() { AtEase::suppressWarnings(); $lastmod = filemtime( $this->filename ); AtEase::restoreWarnings(); if ( $lastmod === false ) { if ( $this->timestamp === false ) { # Still nonexistent return false; } # Deleted wfDebug( "Dependency triggered: {$this->filename} deleted." ); return true; } if ( $lastmod > $this->timestamp ) { # Modified or created wfDebug( "Dependency triggered: {$this->filename} changed." ); return true; } # Not modified return false; } }
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