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<?php |
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namespace SilverStripe\TextExtraction\Cache\FileTextCache; |
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use Psr\SimpleCache\CacheInterface; |
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use SilverStripe\Assets\File; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Flushable; |
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use SilverStripe\Core\Injector\Injector; |
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use SilverStripe\TextExtraction\Cache\FileTextCache; |
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/** |
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* Uses SS_Cache with a lifetime to cache extracted content |
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*/ |
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class Cache implements FileTextCache, Flushable |
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{ |
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use Configurable; |
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/** |
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* Lifetime of cache in seconds |
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* Null is indefinite |
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* |
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* @var int|null |
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* @config |
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*/ |
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private static $lifetime = null; |
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/** |
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* @return CacheInterface |
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*/ |
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protected static function get_cache() |
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{ |
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$for = sprintf('%s.%s', CacheInterface::class, 'FileTextCache_Cache'); |
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return Injector::inst()->get($for); |
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} |
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/** |
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* |
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* @param File $file |
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* @return string |
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*/ |
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protected function getKey(File $file) |
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{ |
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return md5($file->getFilename()); |
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} |
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/** |
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* |
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* @param File $file |
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* @return mixed |
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*/ |
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public function load(File $file) |
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{ |
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$key = $this->getKey($file); |
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$cache = self::get_cache(); |
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return $cache->get($key); |
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} |
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/** |
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* @param File $file |
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* @param string $content |
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* @return string |
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*/ |
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public function save(File $file, $content) |
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{ |
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$lifetime = $this->config()->get('lifetime') ?: 3600; |
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$key = $this->getKey($file); |
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$cache = self::get_cache(); |
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return $cache->set($key, $content, $lifetime); |
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} |
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/** |
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* @return void |
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*/ |
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public static function flush() |
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{ |
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$cache = self::get_cache(); |
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$cache->clear(); |
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} |
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/** |
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* Alias for $this->flush() |
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* |
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* @return void |
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*/ |
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public static function clear() |
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{ |
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$cache = self::get_cache(); |
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$cache->clear(); |
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} |
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/** |
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* |
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* @param File $file |
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* @return bool |
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*/ |
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public function invalidate(File $file) |
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{ |
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$key = $this->getKey($file); |
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$cache = self::get_cache(); |
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return $cache->delete($key); |
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} |
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} |
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