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

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.
doc_Drupal
2016-10-29 09:32:03
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