public function DatabaseBackend::garbageCollection

public DatabaseBackend::garbageCollection()

Performs garbage collection on a cache bin.

The backend may choose to delete expired or invalidated items.

Overrides CacheBackendInterface::garbageCollection

File

core/lib/Drupal/Core/Cache/DatabaseBackend.php, line 327

Class

DatabaseBackend

Defines a default cache implementation.

Namespace

Drupal\Core\Cache

Code

public function garbageCollection() {
  try {
    $this->connection->delete($this->bin)
      ->condition('expire', Cache::PERMANENT, '<>')
      ->condition('expire', REQUEST_TIME, '<')
      ->execute();
  }
  catch (\Exception $e) {
    // If the table does not exist, it surely does not have garbage in it.
    // If the table exists, the next garbage collection will clean up.
    // There is nothing to do.
  }
}