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<?php |
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namespace Chief\Decorators; |
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use Chief\CacheableCommand; |
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use Chief\Command; |
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use Chief\CommandBus; |
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use Chief\Decorator; |
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use Psr\Cache\CacheItemPoolInterface; |
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class CachingDecorator implements Decorator |
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{ |
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/** |
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* @var CommandBus |
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*/ |
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private $innerBus; |
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/** |
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* @var CacheItemPoolInterface |
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*/ |
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private $cache; |
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/** |
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* CachingDecorator constructor. |
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* @param CacheItemPoolInterface $cache |
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*/ |
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public function __construct(CacheItemPoolInterface $cache) |
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{ |
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$this->cache = $cache; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function setInnerBus(CommandBus $bus) |
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{ |
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$this->innerBus = $bus; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function execute(Command $command) |
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{ |
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if (!$command instanceof CacheableCommand) { |
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return $this->innerBus->execute($command); |
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} |
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$cached = $this->cache->getItem(self::createCacheKey($command)); |
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if ($cached->isHit()) { |
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return $cached->get(); |
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} |
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$value = $this->innerBus->execute($command); |
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$this->cache->save($this->createCacheItem($command, $value)); |
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return $value; |
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} |
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/** |
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* Create a new cache item to be persisted. |
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* |
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* @param CacheableCommand $command |
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* @param mixed $value |
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* @return CacheItem |
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*/ |
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private function createCacheItem(CacheableCommand $command, $value) |
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{ |
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return new CacheItem( |
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$this->createCacheKey($command), |
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$value, |
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3600 |
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); |
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} |
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/** |
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* Create the key to be used when saving this item to the cache pool. |
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* |
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* The cache item key is taken as a the (string) serialized command, to ensure the return value is unique |
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* depending on the command properties; that serialized string is then md5'd to ensure it doesn't |
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* overflow any string length limits the implementing CacheItemPoolInterface library has. |
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* |
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* @param CacheableCommand $command |
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* @return string |
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*/ |
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private function createCacheKey(CacheableCommand $command) |
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{ |
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return md5(serialize($command)); |
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} |
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} |
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adamnicholson /
Chief
