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<?php |
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namespace EventEspresso\core\services\loaders; |
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use Closure; |
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use EventEspresso\core\exceptions\InvalidDataTypeException; |
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use EventEspresso\core\services\collections\CollectionInterface; |
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defined('EVENT_ESPRESSO_VERSION') || exit; |
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/** |
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* Class CachingLoader |
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* caches objects returned by the decorated loader |
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* |
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* @package Event Espresso |
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* @author Brent Christensen |
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* @since $VID:$ |
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*/ |
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class CachingLoader extends LoaderDecorator |
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{ |
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/** |
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* @var CollectionInterface $cache |
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*/ |
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protected $cache; |
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/** |
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* @var string $identifier |
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*/ |
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protected $identifier; |
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/** |
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* CachingLoader constructor. |
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* |
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* @param LoaderDecoratorInterface $loader |
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* @param CollectionInterface $cache |
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* @param string $identifier |
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* @throws InvalidDataTypeException |
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*/ |
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public function __construct(LoaderDecoratorInterface $loader, CollectionInterface $cache, $identifier = '') |
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{ |
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parent::__construct($loader); |
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$this->cache = $cache; |
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$this->setIdentifier($identifier); |
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if ($this->identifier !== '') { |
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// to only clear this cache, and assuming an identifier has been set, simply do the following: |
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// do_action('AHEE__EventEspresso\core\services\loaders\CachingLoader__resetCache__IDENTIFIER'); |
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// where "IDENTIFIER" = the string that was set during construction |
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add_action( |
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"AHEE__EventEspresso_core_services_loaders_CachingLoader__resetCache__{$identifier}", |
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array($this, 'reset') |
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); |
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} |
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// to clear ALL caches, simply do the following: |
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// do_action('AHEE__EventEspresso_core_services_loaders_CachingLoader__resetCache'); |
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add_action( |
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'AHEE__EventEspresso_core_services_loaders_CachingLoader__resetCache', |
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array($this, 'reset') |
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); |
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} |
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/** |
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* @return string |
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*/ |
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public function identifier() |
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{ |
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return $this->identifier; |
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} |
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/** |
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* @param string $identifier |
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* @throws InvalidDataTypeException |
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*/ |
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private function setIdentifier($identifier) |
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{ |
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if ( ! is_string($identifier)) { |
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throw new InvalidDataTypeException('$identifier', $identifier, 'string'); |
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} |
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$this->identifier = $identifier; |
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} |
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/** |
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* @param string $fqcn |
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* @param array $arguments |
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* @param bool $shared |
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* @return mixed |
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*/ |
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public function load($fqcn, $arguments = array(), $shared = true) |
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{ |
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$fqcn = ltrim($fqcn, '\\'); |
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// caching can be turned off via the following code: |
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// add_filter('FHEE__EventEspresso_core_services_loaders_CachingLoader__load__bypass_cache', '__return_true'); |
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if( |
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apply_filters( |
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'FHEE__EventEspresso_core_services_loaders_CachingLoader__load__bypass_cache', |
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false, |
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$this |
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) |
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){ |
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// even though $shared might be true, caching should be bypassed for whatever reason, |
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// so we don't want the core loader to cache anything, therefore caching is turned off |
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return $this->loader->load($fqcn, $arguments, false); |
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} |
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$identifier = md5($fqcn . $this->getIdentifierForArgument($arguments)); |
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if($this->cache->has($identifier)){ |
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return $this->cache->get($identifier); |
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} |
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$object = $this->loader->load($fqcn, $arguments, $shared); |
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if($object instanceof $fqcn){ |
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$this->cache->add($object, $identifier); |
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} |
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return $object; |
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} |
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/** |
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* empties cache and calls reset() on loader if method exists |
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*/ |
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public function reset() |
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{ |
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$this->cache->trashAndDetachAll(); |
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$this->loader->reset(); |
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} |
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/** |
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* build a string representation of a class' arguments |
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* (mostly because Closures can't be serialized) |
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* |
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* @param array $arguments |
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* @return string |
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*/ |
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private function getIdentifierForArgument(array $arguments) |
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{ |
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$identifier = ''; |
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foreach ($arguments as $argument) { |
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switch (true) { |
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case is_object($argument) : |
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case $argument instanceof Closure : |
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$identifier .= spl_object_hash($argument); |
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break; |
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case is_array($argument) : |
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$identifier .= $this->getIdentifierForArgument($argument); |
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break; |
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default : |
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$identifier .= $argument; |
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break; |
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} |
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} |
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return $identifier; |
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} |
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} |
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// End of file CachingLoader.php |
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// Location: EventEspresso\core\services\loaders/CachingLoader.php |
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169
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eventespresso /
event-espresso-core
