1<?php
2/**
3 * Data caching with dependencies.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
19 *
20 * @file
21 * @ingroup Cache
22 */
23
24/**
25 * @ingroup Cache
26 */
27class GlobalDependency extends CacheDependency {
28	private $name;
29	private $value;
30
31	public function __construct( $name ) {
32		$this->name = $name;
33		$this->value = $GLOBALS[$name];
34	}
35
36	/**
37	 * @return bool
38	 */
39	public function isExpired() {
40		if ( !isset( $GLOBALS[$this->name] ) ) {
41			return true;
42		}
43
44		return $GLOBALS[$this->name] != $this->value;
45	}
46}
47