Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\State;
Chris@0: 
Chris@0: use Drupal\Core\Cache\CacheBackendInterface;
Chris@0: use Drupal\Core\Cache\CacheCollector;
Chris@0: use Drupal\Core\KeyValueStore\KeyValueFactoryInterface;
Chris@0: use Drupal\Core\Lock\LockBackendInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides the state system using a key value store.
Chris@0:  */
Chris@0: class State extends CacheCollector implements StateInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The key value store to use.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\KeyValueStore\KeyValueStoreInterface
Chris@0:    */
Chris@0:   protected $keyValueStore;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a State object.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\KeyValueStore\KeyValueFactoryInterface $key_value_factory
Chris@0:    *   The key value store to use.
Chris@0:    * @param \Drupal\Core\Cache\CacheBackendInterface $cache
Chris@0:    *   The cache backend.
Chris@0:    * @param \Drupal\Core\Lock\LockBackendInterface $lock
Chris@0:    *   The lock backend.
Chris@0:    */
Chris@0:   public function __construct(KeyValueFactoryInterface $key_value_factory, CacheBackendInterface $cache, LockBackendInterface $lock) {
Chris@0:     parent::__construct('state', $cache, $lock);
Chris@0:     $this->keyValueStore = $key_value_factory->get('state');
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function get($key, $default = NULL) {
Chris@0:     $value = parent::get($key);
Chris@0:     return $value !== NULL ? $value : $default;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function resolveCacheMiss($key) {
Chris@0:     $value = $this->keyValueStore->get($key);
Chris@0:     $this->storage[$key] = $value;
Chris@0:     $this->persist($key);
Chris@0:     return $value;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getMultiple(array $keys) {
Chris@0:     $values = [];
Chris@0:     foreach ($keys as $key) {
Chris@0:       $values[$key] = $this->get($key);
Chris@0:     }
Chris@0:     return $values;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function set($key, $value) {
Chris@0:     parent::set($key, $value);
Chris@0:     $this->keyValueStore->set($key, $value);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function setMultiple(array $data) {
Chris@0:     foreach ($data as $key => $value) {
Chris@0:       parent::set($key, $value);
Chris@0:     }
Chris@0:     $this->keyValueStore->setMultiple($data);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function delete($key) {
Chris@0:     parent::delete($key);
Chris@0:     $this->keyValueStore->delete($key);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function deleteMultiple(array $keys) {
Chris@0:     foreach ($keys as $key) {
Chris@0:       parent::delete($key);
Chris@0:     }
Chris@0:     $this->keyValueStore->deleteMultiple($keys);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function resetCache() {
Chris@0:     $this->clear();
Chris@0:   }
Chris@0: 
Chris@0: }