NullBackend.php

<?php

namespace Drupal\Core\Cache;


/**
 * Defines a stub cache implementation.
 *
 * The stub implementation is needed when database access is not yet available.
 * Because Drupal's caching system never requires that cached data be present,
 * these stub functions can short-circuit the process and sidestep the need for
 * any persistent storage. Using this cache implementation during normal
 * operations would have a negative impact on performance.
 *
 * This also can be used for testing purposes.
 *
 * @ingroup cache
 */
class NullBackend implements CacheBackendInterface {
    
    /**
     * Constructs a NullBackend object.
     *
     * @param string $bin
     *   The cache bin for which the object is created.
     */
    public function __construct($bin) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function get($cid, $allow_invalid = FALSE) {
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getMultiple(&$cids, $allow_invalid = FALSE) {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function set($cid, $data, $expire = Cache::PERMANENT, array $tags = []) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function setMultiple(array $items = []) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function delete($cid) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function deleteMultiple(array $cids) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function deleteAll() {
    }
    
    /**
     * {@inheritdoc}
     */
    public function invalidate($cid) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function invalidateMultiple(array $cids) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function invalidateAll() {
    }
    
    /**
     * {@inheritdoc}
     */
    public function garbageCollection() {
    }
    
    /**
     * {@inheritdoc}
     */
    public function removeBin() {
    }

}