class NullBackend in Drupal 10

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 \Drupal\Core\Cache\CacheBackendInterface

Related topics

Cache API

Information about the Drupal Cache API

9 files declare their use of NullBackend

CachedStorageTest.php in core/tests/Drupal/Tests/Core/Config/CachedStorageTest.php

ContextDefinitionIsSatisfiedTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/ContextDefinitionIsSatisfiedTest.php

ContextHandlerTest.php in core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php

Contains \Drupal\Tests\Core\Plugin\ContextHandlerTest.

EntityContextDefinitionIsSatisfiedTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/EntityContextDefinitionIsSatisfiedTest.php

NullBackendTest.php in core/tests/Drupal/Tests/Core/Cache/NullBackendTest.php

... See full list

File

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

Namespace

Drupal\Core\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() {
  }

}