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<?php |
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namespace DominionEnterprises\Memoize; |
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use \Predis\Client; |
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/** |
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* A memoizer that caches the results in a redis cache. |
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*/ |
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class Predis implements Memoize |
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{ |
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/** |
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* The predis client |
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* |
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* @var \Predis\Client |
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*/ |
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private $_client; |
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/** |
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* Cache refresh |
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* |
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* @var boolean |
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*/ |
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private $_refresh; |
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/** |
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* Sets the predis client. |
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* |
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* @param \Predis\Client $client The predis client to use |
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* @param boolean $refresh If true we will always overwrite cache even if it is already set |
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*/ |
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public function __construct(Client $client, $refresh = false) |
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{ |
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$this->_client = $client; |
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$this->_refresh = $refresh; |
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} |
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/** |
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* The value is stored in redis as a json_encoded string, so make sure that the value you return from $compute is json-encodable. |
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* |
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* @see Memoize::memoizeCallable |
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*/ |
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public function memoizeCallable($key, $compute, $cacheTime = null) |
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{ |
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if (!$this->_refresh) { |
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try { |
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$cached = $this->_client->get($key); |
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if ($cached !== null) { |
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$data = json_decode($cached, true); |
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return $data['result']; |
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} |
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} catch (\Exception $e) { |
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return call_user_func($compute); |
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} |
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} |
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$result = call_user_func($compute); |
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$this->_cache($key, json_encode(['result' => $result]), $cacheTime); |
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return $result; |
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} |
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/** |
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* Caches the value into redis with errors suppressed. |
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* |
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* @param string $key The key. |
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* @param string $value The value. |
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* @param int $cacheTime The optional cache time |
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* @return void |
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*/ |
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private function _cache($key, $value, $cacheTime = null) |
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{ |
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try { |
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$this->_client->set($key, $value); |
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if ($cacheTime !== null) { |
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$this->_client->expire($key, $cacheTime); |
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} |
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} catch (\Exception $e) { |
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// We don't want exceptions in accessing the cache to break functionality. The cache should be as transparent as possible. |
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// If insight is needed into these exceptions, a better way would be by notifying an observer with the errors. |
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} |
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} |
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} |
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dominionenterprises /
memoize-php
