<?php

/*

 * This file is part of the Assetic package, an OpenSky project.

 *

 * (c) 2010-2011 OpenSky Project Inc

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Assetic\Cache;

/**

 * Interface for a cache backend.

 *

 * @author Kris Wallsmith <kris.wallsmith@gmail.com>

 */

interface CacheInterface

{

    /**

     * Checks if the cache has a value for a key.

     *

     * @param string $key A unique key

     *

     * @return Boolean Whether the cache has a value for this key

     */

    function has($key);

    /**

     * Returns the value for a key.

     *

     * @param string $key A unique key

     *

     * @return string|null The value in the cache

     */

    function get($key);

    /**

     * Sets a value in the cache.

     *

     * @param string $key   A unique key

     * @param string $value The value to cache

     */

    function set($key, $value);

    /**

     * Removes a value from the cache.

     *

     * @param string $key A unique key

     */

    function remove($key);

}