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<?php |
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namespace Genkgo\Cache\Adapter; |
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use DateInterval; |
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use DateTime; |
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use DateTimeImmutable; |
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use Exception; |
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use Genkgo\Cache\CacheAdapterInterface; |
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use Genkgo\Cache\CallbackCacheInterface; |
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/** |
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* Class StampedeCallbackAdapter |
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* @package Genkgo\Cache |
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*/ |
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class StampedeCallbackAdapter implements CallbackCacheInterface |
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{ |
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/** |
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* @var CacheAdapterInterface |
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*/ |
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private $cache; |
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/** |
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* @var int |
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*/ |
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private $pregenerateIn; |
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/** |
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* @var bool |
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*/ |
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private $useInvalidDataOnException = false; |
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/** |
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* @param CacheAdapterInterface $cache |
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* @param $pregenerateInSeconds |
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* @param bool $useInvalidDataOnException |
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*/ |
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public function __construct( |
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CacheAdapterInterface $cache, |
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$pregenerateInSeconds, |
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$useInvalidDataOnException = false |
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) { |
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$this->cache = $cache; |
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$this->pregenerateIn = $pregenerateInSeconds; |
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$this->useInvalidDataOnException = $useInvalidDataOnException; |
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} |
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/** |
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* @deprecated |
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*/ |
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public function useInvalidDataOnException() |
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{ |
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$this->useInvalidDataOnException = true; |
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} |
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/** |
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* @param $key |
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* @param callable $cb |
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* @return mixed|null |
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* @throws Exception |
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*/ |
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public function get($key, callable $cb) |
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{ |
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$currentItem = $this->cache->get($key); |
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if ($currentItem === null || $this->needsPregeneration($key) === true) { |
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$this->lock($key); |
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$item = $this->pregenerate($key, $cb, $currentItem); |
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$this->cache->set($key, $item); |
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$this->unlock($key); |
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return $item; |
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} else { |
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return $currentItem; |
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} |
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} |
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/** |
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* @param $key |
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* @return bool |
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*/ |
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private function needsPregeneration($key) |
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{ |
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$regenerateOn = $this->cache->get('sp' . $key); |
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if ($regenerateOn === null) { |
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return true; |
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} |
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if ($regenerateOn === 'locked') { |
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return false; |
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} |
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$regenerateOn = DateTimeImmutable::createFromFormat(DateTime::ISO8601, $regenerateOn); |
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return ($regenerateOn <= new DateTimeImmutable('now')); |
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} |
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/** |
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* @param $key |
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* @param callable $cb |
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* @param $currentItem |
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* @return mixed |
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* @throws Exception |
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*/ |
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private function pregenerate($key, callable $cb, $currentItem) |
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{ |
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try { |
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$item = $cb(); |
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} catch (Exception $e) { |
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if ($this->useInvalidDataOnException && $currentItem !== null) { |
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$item = $currentItem; |
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} else { |
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$this->unlock($key, 0); |
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throw $e; |
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} |
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} |
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return $item; |
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} |
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/** |
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* @param $key |
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*/ |
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private function lock($key) |
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{ |
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$this->cache->set('sp' . $key, 'locked'); |
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} |
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/** |
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* @param $key |
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* @param integer $pregenerateIn |
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*/ |
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5 |
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private function unlock($key, $pregenerateIn = null) |
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{ |
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if ($pregenerateIn === null) { |
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$pregenerateIn = $this->pregenerateIn; |
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} |
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$interval = new DateInterval('PT' . $pregenerateIn . 'S'); |
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$regeneratedOn = (new DateTimeImmutable('now'))->add($interval)->format(DateTime::ISO8601); |
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$this->cache->set('sp' . $key, $regeneratedOn); |
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} |
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} |
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genkgo /
cache
