interface FieldStorageDefinitionListenerInterface

interface FieldStorageDefinitionListenerInterface {
    
    /**
     * Reacts to the creation of a field storage definition.
     *
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition
     *   The definition being created.
     */
    public function onFieldStorageDefinitionCreate(FieldStorageDefinitionInterface $storage_definition);
    
    /**
     * Reacts to the update of a field storage definition.
     *
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition
     *   The field being updated.
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $original
     *   The original storage definition; i.e., the definition before the update.
     *
     * @throws \Drupal\Core\Entity\Exception\FieldStorageDefinitionUpdateForbiddenException
     *   Thrown when the update to the field is forbidden.
     */
    public function onFieldStorageDefinitionUpdate(FieldStorageDefinitionInterface $storage_definition, FieldStorageDefinitionInterface $original);
    
    /**
     * Reacts to the deletion of a field storage definition.
     *
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition
     *   The field being deleted.
     */
    public function onFieldStorageDefinitionDelete(FieldStorageDefinitionInterface $storage_definition);

}