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1 | <?php |
2 | |
3 | /** |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by |
6 | * the Free Software Foundation; either version 2 of the License, or |
7 | * (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
17 | * http://www.gnu.org/copyleft/gpl.html |
18 | * |
19 | * @file |
20 | * @since 1.35 |
21 | */ |
22 | |
23 | namespace MediaWiki\Skins\Vector\FeatureManagement\Requirements; |
24 | |
25 | use MediaWiki\Config\Config; |
26 | use MediaWiki\Skins\Vector\FeatureManagement\Requirement; |
27 | |
28 | /** |
29 | * Some application state changes throughout the lifetime of the application, e.g. `wgSitename` or |
30 | * `wgFullyInitialised`, which signals whether the application boot process has finished and |
31 | * critical resources like database connections are available. |
32 | * |
33 | * The `DynamicStateRequirement` allows us to define requirements that lazily evaluate the |
34 | * application state statically, e.g. |
35 | * |
36 | * ```lang=php |
37 | * $featureManager->registerRequirement( |
38 | * new DynamicConfigRequirement( |
39 | * $config, |
40 | * MainConfigNames::Sitename, |
41 | * 'requirementName' |
42 | * ) |
43 | * ); |
44 | * ``` |
45 | * |
46 | * registers a requirement that will evaluate to true only when `mediawiki/includes/Setup.php` has |
47 | * finished executing (after all service wiring has executed). I.e., every call to |
48 | * `Requirement->isMet()` reinterrogates the Config object for the current state and returns it. |
49 | * Contrast to |
50 | * |
51 | * ```lang=php |
52 | * $featureManager->registerSimpleRequirement( |
53 | * 'requirementName', |
54 | * (bool)$config->get( MainConfigNames::Sitename ) |
55 | * ); |
56 | * ``` |
57 | * |
58 | * wherein state is evaluated only once at registration time and permanently cached. |
59 | * |
60 | * NOTE: This API hasn't settled. It may change at any time without warning. Please don't bind to |
61 | * it unless you absolutely need to |
62 | * |
63 | * @unstable |
64 | * |
65 | * @package MediaWiki\Skins\Vector\FeatureManagement\Requirements |
66 | * @internal |
67 | */ |
68 | final class DynamicConfigRequirement implements Requirement { |
69 | |
70 | private Config $config; |
71 | |
72 | private string $configName; |
73 | |
74 | private string $requirementName; |
75 | |
76 | /** |
77 | * @param Config $config |
78 | * @param string $configName Any `Config` key. This name is used to query `$config` state. E.g., |
79 | * `'DBname'`. See https://www.mediawiki.org/wiki/Manual:Configuration_settings |
80 | * @param string $requirementName The name of the requirement presented to FeatureManager. |
81 | * This name _usually_ matches the `$configName` parameter for simplicity but allows for |
82 | * abstraction as needed. See `Requirement->getName()`. |
83 | */ |
84 | public function __construct( Config $config, string $configName, string $requirementName ) { |
85 | $this->config = $config; |
86 | $this->configName = $configName; |
87 | $this->requirementName = $requirementName; |
88 | } |
89 | |
90 | /** |
91 | * @inheritDoc |
92 | */ |
93 | public function getName(): string { |
94 | return $this->requirementName; |
95 | } |
96 | |
97 | /** |
98 | * @inheritDoc |
99 | */ |
100 | public function isMet(): bool { |
101 | return (bool)$this->config->get( $this->configName ); |
102 | } |
103 | } |