class PermanentDatabaseBackend in Permanent Cache Bin 8.2

Defines a permanent database cache implementation.

This cache implementation can be used for data like stock which don't really need to be cleared during normal cache rebuilds and need to be cleared . It uses the database to store cached data. Each cache bin corresponds to a database table by the same name.

Hierarchy

• class \Drupal\Core\Cache\DatabaseBackend implements CacheBackendInterface
  • class \Drupal\pcb\Cache\PermanentDatabaseBackend

File

src/Cache/PermanentDatabaseBackend.php, line 18

Namespace

Drupal\pcb\Cache

class PermanentDatabaseBackend extends DatabaseBackend {

  /**
   * {@inheritdoc}
   */
  public function deleteAll() {

    // This cache doesn't need to be deleted when doing cache rebuild.
    // We do nothing here.
  }

  /**
   * Deletes all cache items in a bin when explicitly called.
   *
   * @see \Drupal\Core\Cache\DatabaseBackend::deleteAll()
   */
  public function deleteAllPermanent() {
    parent::deleteAll();
  }

}

Members

Name	Modifiers	Type	Description	Overrides
CacheBackendInterface::CACHE_PERMANENT		constant	Indicates that the item should never be removed unless explicitly deleted.
DatabaseBackend::$bin	protected	property
DatabaseBackend::$checksumProvider	protected	property	The cache tags checksum provider.
DatabaseBackend::$connection	protected	property	The database connection.
DatabaseBackend::$maxRows	protected	property	The maximum number of rows that this cache bin table is allowed to store.
DatabaseBackend::catchException	protected	function	Act on an exception when cache might be stale.
DatabaseBackend::DEFAULT_MAX_ROWS		constant	The default maximum number of rows that this cache bin table can store.
DatabaseBackend::delete	public	function	Deletes an item from the cache. Overrides CacheBackendInterface::delete
DatabaseBackend::deleteMultiple	public	function	Deletes multiple items from the cache. Overrides CacheBackendInterface::deleteMultiple
DatabaseBackend::doSetMultiple	protected	function	Stores multiple items in the persistent cache.
DatabaseBackend::ensureBinExists	protected	function	Check if the cache bin exists and create it if not.
DatabaseBackend::garbageCollection	public	function	Performs garbage collection on a cache bin. Overrides CacheBackendInterface::garbageCollection
DatabaseBackend::get	public	function	Returns data from the persistent cache. Overrides CacheBackendInterface::get
DatabaseBackend::getMaxRows	public	function	The maximum number of rows that this cache bin table is allowed to store.
DatabaseBackend::getMultiple	public	function	Returns data from the persistent cache when given an array of cache IDs. Overrides CacheBackendInterface::getMultiple
DatabaseBackend::invalidate	public	function	Marks a cache item as invalid. Overrides CacheBackendInterface::invalidate
DatabaseBackend::invalidateAll	public	function	Marks all cache items as invalid. Overrides CacheBackendInterface::invalidateAll
DatabaseBackend::invalidateMultiple	public	function	Marks cache items as invalid. Overrides CacheBackendInterface::invalidateMultiple
DatabaseBackend::MAXIMUM_NONE		constant	-1 means infinite allows numbers of rows for the cache backend.
DatabaseBackend::normalizeCid	protected	function	Normalizes a cache ID in order to comply with database limitations.
DatabaseBackend::prepareItem	protected	function	Prepares a cached item.
DatabaseBackend::removeBin	public	function	Remove a cache bin. Overrides CacheBackendInterface::removeBin
DatabaseBackend::schemaDefinition	public	function	Defines the schema for the {cache_*} bin tables.
DatabaseBackend::set	public	function	Stores data in the persistent cache. Overrides CacheBackendInterface::set
DatabaseBackend::setMultiple	public	function	Store multiple items in the persistent cache. Overrides CacheBackendInterface::setMultiple
DatabaseBackend::__construct	public	function	Constructs a DatabaseBackend object.
PermanentDatabaseBackend::deleteAll	public	function	Deletes all cache items in a bin. Overrides DatabaseBackend::deleteAll
PermanentDatabaseBackend::deleteAllPermanent	public	function	Deletes all cache items in a bin when explicitly called.