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- <?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() {}
- }
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