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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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