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<?php |
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namespace Victoire\Bundle\WidgetBundle\Cache; |
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use Predis\Client; |
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use Symfony\Component\Security\Core\Authorization\AuthorizationChecker; |
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use Victoire\Bundle\WidgetBundle\Entity\Widget; |
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use Victoire\Bundle\WidgetBundle\Entity\WidgetSlotInterface; |
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use Victoire\Bundle\WidgetBundle\Helper\WidgetHelper; |
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/** |
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* This class handle the saving of Widgets. |
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* Widgets are stored for a week, but are invalidated as soon as |
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* the Widget's or BusinessEntity's updatedAt field is changed. |
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*/ |
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class WidgetCache |
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{ |
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/** |
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* @var Client |
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*/ |
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private $redis; |
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/** |
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* @var AuthorizationChecker |
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*/ |
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private $authorizationChecker; |
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/** |
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* @var WidgetHelper |
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*/ |
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private $widgetHelper; |
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/** |
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* WidgetCache constructor. |
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* |
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* @param Client $redis |
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* @param AuthorizationChecker $authorizationChecker |
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* @param WidgetHelper $widgetHelper |
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*/ |
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public function __construct(Client $redis, AuthorizationChecker $authorizationChecker, WidgetHelper $widgetHelper) |
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{ |
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$this->redis = $redis; |
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$this->authorizationChecker = $authorizationChecker; |
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$this->widgetHelper = $widgetHelper; |
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} |
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/** |
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* @param Widget $widget |
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* |
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* @return string |
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*/ |
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public function fetch(Widget $widget) |
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{ |
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return $this->redis->get($this->getHash($widget)); |
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} |
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/** |
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* @param Widget $widget |
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* |
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* @return int |
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*/ |
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public function remove(Widget $widget) |
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{ |
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return $this->redis->del($this->getHash($widget)); |
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} |
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/** |
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* @param Widget $widget |
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* @param $content |
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*/ |
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public function save(Widget $widget, $content) |
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{ |
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$hash = $this->getHash($widget); |
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if ($hash) { |
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$this->redis->set($hash, $content); |
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$this->redis->expire($hash, $this->widgetHelper->getCacheTimeout($widget)); // cache for a week |
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} |
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} |
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/** |
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* clear all redis cache. |
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*/ |
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public function clear() |
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{ |
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$this->redis->executeCommand($this->redis->createCommand('FLUSHALL')); |
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} |
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/** |
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* @param Widget $widget |
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* |
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* @return string |
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*/ |
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protected function getHash(Widget $widget) |
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{ |
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$hash = null; |
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if (!$widget instanceof WidgetSlotInterface) { |
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if ($widget->getMode() == Widget::MODE_BUSINESS_ENTITY |
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&& ($entity = $widget->getEntity()) |
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&& method_exists($widget->getEntity(), 'getUpdatedAt')) { |
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$hash = $this->generateBusinessEntityHash($widget); |
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} elseif ($widget->getMode() == Widget::MODE_STATIC) { |
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$hash = $this->generateHash($widget); |
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} |
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} |
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return $hash; |
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} |
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protected function generateBusinessEntityHash(Widget $widget) |
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{ |
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return sprintf('%s--%s-%s-%s', |
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$widget->generateCacheId(), |
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$widget->getEntity()->getId(), |
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$widget->getEntity()->getUpdatedAt()->getTimestamp(), |
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(string) $this->authorizationChecker->isGranted('ROLE_VICTOIRE') |
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); |
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} |
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private function generateHash(Widget $widget) |
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{ |
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return sprintf('%s-%s', |
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$widget->generateCacheId(), |
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(string) $this->authorizationChecker->isGranted('ROLE_VICTOIRE') |
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); |
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} |
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} |
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In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: