1 | <?php |
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2 | |||
3 | namespace SilverStripe\VersionFeed\Filters; |
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4 | |||
5 | use SilverStripe\Core\Config\Config; |
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6 | |||
7 | /** |
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8 | * Caches results of a callback |
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9 | */ |
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10 | class CachedContentFilter extends ContentFilter |
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11 | { |
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12 | |||
13 | /** |
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14 | * Enable caching |
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15 | * |
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16 | * @config |
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17 | * @var boolean |
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18 | */ |
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19 | private static $cache_enabled = true; |
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20 | |||
21 | public function getContent($key, $callback) |
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22 | { |
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23 | $cache = $this->getCache(); |
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24 | |||
25 | // Return cached value if available |
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26 | $cacheEnabled = Config::inst()->get(get_class(), 'cache_enabled'); |
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27 | $result = (isset($_GET['flush']) || !$cacheEnabled) |
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28 | ? null |
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29 | : $cache->get($key); |
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30 | if ($result) { |
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31 | return $result; |
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32 | } |
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33 | |||
34 | // Fallback to generate result |
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35 | $result = parent::getContent($key, $callback); |
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36 | $lifetime = Config::inst()->get(ContentFilter::class, 'cache_lifetime') ?: null; |
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37 | $cache->set($key, $result, $lifetime); |
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38 | return $result; |
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39 | } |
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40 | } |
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41 |