<?php
namespace TYPO3\CMS\Core\Cache\Backend;

/*                                                                        *
 * This script belongs to the FLOW3 framework.                            *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 * of the License, or (at your option) any later version.                 *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */
/**
 * A contract for a cache backend which supports tagging.
 *
 * @api
 */
interface TaggableBackendInterface extends \TYPO3\CMS\Core\Cache\Backend\BackendInterface {
	/**
	 * Removes all cache entries of this cache which are tagged by the specified tag.
	 *
	 * @param string $tag The tag the entries must have
	 * @return void
	 * @api
	 */
	public function flushByTag($tag);

	/**
	 * Finds and returns all cache entry identifiers which are tagged by the
	 * specified tag
	 *
	 * @param string $tag The tag to search for
	 * @return array An array with identifiers of all matching entries. An empty array if no entries matched
	 * @api
	 */
	public function findIdentifiersByTag($tag);

}

?>