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<?php |
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/* |
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* This file is part of the FOSHttpCache package. |
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* |
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* (c) FriendsOfSymfony <http://friendsofsymfony.github.com/> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace FOS\HttpCache\SymfonyCache; |
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use Symfony\Component\EventDispatcher\EventDispatcher; |
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use Symfony\Component\EventDispatcher\EventDispatcherInterface; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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use Symfony\Component\HttpFoundation\Request; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\HttpKernel\HttpKernelInterface; |
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/** |
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* Trait for enhanced Symfony reverse proxy based on the symfony kernel component. |
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* |
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* Your kernel needs to implement CacheInvalidatorInterface and redeclare the |
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* fetch method as public. (The latter is needed because the trait declaring it |
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* public does not satisfy the interface for whatever reason. See also |
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* http://stackoverflow.com/questions/31877844/php-trait-exposing-a-method-and-interfaces ) |
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* |
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* CacheInvalidator kernels support event listeners that can act on the |
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* events defined in FOS\HttpCache\SymfonyCache\Events and may alter the |
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* request flow. |
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* |
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* If your kernel overwrites any of the methods defined in this trait, make |
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* sure to also call the trait method. You might get into issues with the order |
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* of events, in which case you will need to copy event triggering into your |
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* kernel. |
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* |
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* @author Jérôme Vieilledent <[email protected]> (courtesy of eZ Systems AS) |
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* @author David Buchmann <[email protected]> |
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* |
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* {@inheritdoc} |
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*/ |
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trait EventDispatchingHttpCache |
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{ |
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/** |
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* @var EventDispatcherInterface |
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*/ |
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private $eventDispatcher; |
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/** |
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* Get event dispatcher. |
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* |
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* @return EventDispatcherInterface |
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*/ |
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public function getEventDispatcher() |
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{ |
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if (null === $this->eventDispatcher) { |
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$this->eventDispatcher = new EventDispatcher(); |
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} |
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return $this->eventDispatcher; |
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} |
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/** |
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* Add an event subscriber. |
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* |
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* @see EventDispatcherInterface::addSubscriber |
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*/ |
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public function addSubscriber(EventSubscriberInterface $subscriber) |
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{ |
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$this->getEventDispatcher()->addSubscriber($subscriber); |
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} |
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/** |
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* Add an event listener to this HttpCache. |
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* |
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* @see EventDispatcherInterface::addListener |
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*/ |
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public function addListener($eventName, $listener, $priority = 0) |
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{ |
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$this->getEventDispatcher()->addListener($eventName, $listener, $priority); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* Adding the Events::PRE_HANDLE and Events::POST_HANDLE events. |
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*/ |
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public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true) |
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{ |
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// trigger loading the CacheEvent to avoid fatal error when HttpKernel::loadClassCache is used. |
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class_exists(CacheEvent::class); |
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if ($response = $this->dispatch(Events::PRE_HANDLE, $request)) { |
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return $this->dispatch(Events::POST_HANDLE, $request, $response); |
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} |
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$response = parent::handle($request, $type, $catch); |
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return $this->dispatch(Events::POST_HANDLE, $request, $response); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* Trigger event to alter response before storing it in the cache. |
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*/ |
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protected function store(Request $request, Response $response) |
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{ |
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$response = $this->dispatch(Events::PRE_STORE, $request, $response); |
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parent::store($request, $response); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* Adding the Events::PRE_INVALIDATE event. |
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*/ |
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protected function invalidate(Request $request, $catch = false) |
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{ |
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if ($response = $this->dispatch(Events::PRE_INVALIDATE, $request)) { |
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return $response; |
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} |
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return parent::invalidate($request, $catch); |
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} |
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/** |
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* Dispatch an event if needed. |
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* |
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* @param string $name Name of the event to trigger. One of the constants in FOS\HttpCache\SymfonyCache\Events |
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* @param Request $request |
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* @param Response|null $response If already available |
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* |
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* @return Response The response to return, which might be provided/altered by a listener |
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*/ |
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protected function dispatch($name, Request $request, Response $response = null) |
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{ |
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if ($this->getEventDispatcher()->hasListeners($name)) { |
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$event = new CacheEvent($this, $request, $response); |
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$this->getEventDispatcher()->dispatch($name, $event); |
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$response = $event->getResponse(); |
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} |
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return $response; |
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} |
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} |
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FriendsOfSymfony /
FOSHttpCache
