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<?php |
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/** |
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* @author Matthias Glaub <[email protected]> |
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*/ |
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namespace MaglMarkdown\Cache; |
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use Zend\Cache\Storage\StorageInterface; |
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use Zend\EventManager\Event; |
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use Zend\EventManager\EventManagerInterface; |
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use Zend\EventManager\ListenerAggregateInterface; |
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/** |
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* Class CacheListener |
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* |
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* @package MaglMarkdown\Cache |
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*/ |
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class CacheListener implements ListenerAggregateInterface |
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{ |
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/** |
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* |
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* @var StorageInterface |
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*/ |
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private $cache; |
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/** |
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* @var callable[] |
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*/ |
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protected $listeners = array(); |
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/** |
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* {@inheritDoc} |
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*/ |
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public function detach(EventManagerInterface $events) |
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{ |
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foreach ($this->listeners as $index => $callback) { |
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$events->detach($callback); |
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unset($this->listeners[$index]); |
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} |
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} |
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public function __construct(StorageInterface $cache) |
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{ |
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$this->cache = $cache; |
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} |
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/** |
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* @param EventManagerInterface $events |
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* @param int $priority |
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*/ |
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public function attach(EventManagerInterface $events, $priority = 1) |
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{ |
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$this->listeners[] = $events->attach('markdown.render.pre', array($this, 'preRender'), $priority); |
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$this->listeners[] = $events->attach('markdown.render.post', array($this, 'postRender'), $priority); |
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} |
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/** |
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* Searches the cache for rendered markdown. |
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* |
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* @param \Zend\EventManager\Event $event |
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* @return mixed the rendered markdown, if found, false otherwise |
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* @throws \Zend\Cache\Exception\ExceptionInterface |
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*/ |
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public function preRender(Event $event) |
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{ |
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$markdown = $event->getParam('markdown'); |
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$markdownHash = md5($markdown); |
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$success = false; |
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$renderedMarkdown = $this->cache->getItem($markdownHash, $success); |
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if ($success) { |
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$event->stopPropagation(true); |
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return $renderedMarkdown; |
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} |
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return false; |
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} |
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/** |
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* Saves the rendered markdown within the cache. |
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* |
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* @param \Zend\EventManager\Event $event |
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* @return mixed |
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* @throws \Zend\Cache\Exception\ExceptionInterface |
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*/ |
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public function postRender(Event $event) |
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{ |
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$markdown = $event->getParam('markdown'); |
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$renderedMarkdown = $event->getParam('renderedMarkdown'); |
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$markdownHash = md5($markdown); |
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return $this->cache->setItem($markdownHash, $renderedMarkdown); |
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} |
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} |
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maglnet /
MaglMarkdown
