<?php

/**

 * SimplePie

 *

 * A PHP-Based RSS and Atom Feed Framework.

 * Takes the hard work out of managing a complete RSS/Atom solution.

 *

 * Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification, are

 * permitted provided that the following conditions are met:

 *

 * 	* Redistributions of source code must retain the above copyright notice, this list of

 * 	  conditions and the following disclaimer.

 *

 * 	* Redistributions in binary form must reproduce the above copyright notice, this list

 * 	  of conditions and the following disclaimer in the documentation and/or other materials

 * 	  provided with the distribution.

 *

 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used

 * 	  to endorse or promote products derived from this software without specific prior

 * 	  written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS

 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * @package SimplePie

 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue

 * @author Ryan Parman

 * @author Sam Sneddon

 * @author Ryan McCue

 * @link http://simplepie.org/ SimplePie

 * @license http://www.opensource.org/licenses/bsd-license.php BSD License

 */

/**

 * Base for cache objects

 *

 * Classes to be used with {@see SimplePie_Cache::register()} are expected

 * to implement this interface.

 *

 * @package SimplePie

 * @subpackage Caching

 */

interface SimplePie_Cache_Base

{

	/**

	 * Feed cache type

	 *

	 * @var string

	 */

	const TYPE_FEED = 'spc';

	/**

	 * Image cache type

	 *

	 * @var string

	 */

	const TYPE_IMAGE = 'spi';

	/**

	 * Create a new cache object

	 *

	 * @param string $location Location string (from SimplePie::$cache_location)

	 * @param string $name Unique ID for the cache

	 * @param string $type Either TYPE_FEED for SimplePie data, or TYPE_IMAGE for image data

	 */

	public function __construct($location, $name, $type);

	/**

	 * Save data to the cache

	 *

	 * @param array|SimplePie $data Data to store in the cache. If passed a SimplePie object, only cache the $data property

	 * @return bool Successfulness

	 */

	public function save($data);

	/**

	 * Retrieve the data saved to the cache

	 *

	 * @return array Data for SimplePie::$data

	 */

	public function load();

	/**

	 * Retrieve the last modified time for the cache

	 *

	 * @return int Timestamp

	 */

	public function mtime();

	/**

	 * Set the last modified time to the current time

	 *

	 * @return bool Success status

	 */

	public function touch();

	/**

	 * Remove the cache

	 *

	 * @return bool Success status

	 */

	public function unlink();

}