class UpdateBackend in Drupal 8

Defines a cache backend for use during Drupal database updates.

Passes on deletes to another backend while extending the NullBackend to avoid using anything cached prior to running updates.

Hierarchy

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

File

core/lib/Drupal/Core/Update/UpdateBackend.php, line 14

Namespace

Drupal\Core\Update

class UpdateBackend extends NullBackend {

  /**
   * The regular runtime cache backend.
   *
   * @var \Drupal\Core\Cache\CacheBackendInterface
   */
  protected $backend;

  /**
   * UpdateBackend constructor.
   *
   * @param \Drupal\Core\Cache\CacheBackendInterface $backend
   *   The regular runtime cache backend.
   */
  public function __construct(CacheBackendInterface $backend) {
    $this->backend = $backend;
  }

  /**
   * {@inheritdoc}
   */
  public function delete($cid) {
    $this->backend
      ->delete($cid);
  }

  /**
   * {@inheritdoc}
   */
  public function deleteMultiple(array $cids) {
    $this->backend
      ->deleteMultiple($cids);
  }

  /**
   * {@inheritdoc}
   */
  public function deleteAll() {
    $this->backend
      ->deleteAll();
  }

}

Members

Name	Modifiers	Type	Description	Overrides
CacheBackendInterface::CACHE_PERMANENT		constant	Indicates that the item should never be removed unless explicitly deleted.
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
UpdateBackend::$backend	protected	property	The regular runtime cache backend.
UpdateBackend::delete	public	function	Deletes an item from the cache. Overrides NullBackend::delete
UpdateBackend::deleteAll	public	function	Deletes all cache items in a bin. Overrides NullBackend::deleteAll
UpdateBackend::deleteMultiple	public	function	Deletes multiple items from the cache. Overrides NullBackend::deleteMultiple
UpdateBackend::__construct	public	function	UpdateBackend constructor. Overrides NullBackend::__construct