class NullBackend

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.

Hierarchy

• class \Drupal\Core\Cache\NullBackend implements CacheBackendInterface

Related topics

Cache API

Information about the Drupal Cache API

File

core/lib/Drupal/Core/Cache/NullBackend.php, line 18

Namespace

Drupal\Core\Cache

Members

Name	Modifiers	Type	Description
CacheBackendInterface::CACHE_PERMANENT		constant	Indicates that the item should never be removed unless explicitly deleted.
NullBackend::delete	public	function	Deletes an item from the cache. Overrides CacheBackendInterface::delete
NullBackend::deleteAll	public	function	Deletes all cache items in a bin. Overrides CacheBackendInterface::deleteAll
NullBackend::deleteMultiple	public	function	Deletes multiple items from the cache. Overrides CacheBackendInterface::deleteMultiple
NullBackend::garbageCollection	public	function	Performs garbage collection on a cache bin. Overrides CacheBackendInterface::garbageCollection
NullBackend::get	public	function	Returns data from the persistent cache. Overrides CacheBackendInterface::get
NullBackend::getMultiple	public	function	Returns data from the persistent cache when given an array of cache IDs. Overrides CacheBackendInterface::getMultiple
NullBackend::invalidate	public	function	Marks a cache item as invalid. Overrides CacheBackendInterface::invalidate
NullBackend::invalidateAll	public	function	Marks all cache items as invalid. Overrides CacheBackendInterface::invalidateAll
NullBackend::invalidateMultiple	public	function	Marks cache items as invalid. Overrides CacheBackendInterface::invalidateMultiple
NullBackend::removeBin	public	function	Remove a cache bin. Overrides CacheBackendInterface::removeBin
NullBackend::set	public	function	Stores data in the persistent cache. Overrides CacheBackendInterface::set
NullBackend::setMultiple	public	function	Store multiple items in the persistent cache. Overrides CacheBackendInterface::setMultiple
NullBackend::__construct	public	function	Constructs a NullBackend object.