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<?php
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Core\Cache\Backend;
/**
* A contract for a cache backend which can be frozen.
*/
interface FreezableBackendInterface extends BackendInterface
{
/**
* Freezes this cache backend.
*
* All data in a frozen backend remains unchanged and methods which try to add
* or modify data result in an exception thrown. Possible expiry times of
* individual cache entries are ignored.
*
* On the positive side, a frozen cache backend is much faster on read access.
* A frozen backend can only be thawn by calling the flush() method.
*/
public function freeze();
/**
* Tells if this backend is frozen.
*
* @return bool
*/
public function isFrozen();
}