<?php

/**

 * SimplePie

 *

 * A PHP-Based RSS and Atom Feed Framework.

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

 *

 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey 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

 * @version 1.3.1

 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue

 * @author Ryan Parman

 * @author Geoffrey Sneddon

 * @author Ryan McCue

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

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

 */

/**

 * Caches data to memcache

 *

 * Registered for URLs with the "memcache" protocol

 *

 * For example, `memcache://localhost:11211/?timeout=3600&prefix=sp_` will

 * connect to memcache on `localhost` on port 11211. All tables will be

 * prefixed with `sp_` and data will expire after 3600 seconds

 *

 * @package SimplePie

 * @subpackage Caching

 * @uses Memcache

 */

class SimplePie_Cache_Memcache implements SimplePie_Cache_Base

{

	/**

	 * Memcache instance

	 *

	 * @var Memcache

	 */

	protected $cache;

	/**

	 * Options

	 *

	 * @var array

	 */

	protected $options;

	/**

	 * Cache name

	 *

	 * @var string

	 */

	protected $name;

	/**

	 * 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)

	{

		$this->options = array(

			'host' => '127.0.0.1',

			'port' => 11211,

			'extras' => array(

				'timeout' => 3600, // one hour

				'prefix' => 'simplepie_',

			),

		);

		$parsed = SimplePie_Cache::parse_URL($location);

		$this->options['host'] = empty($parsed['host']) ? $this->options['host'] : $parsed['host'];

		$this->options['port'] = empty($parsed['port']) ? $this->options['port'] : $parsed['port'];

		$this->options['extras'] = array_merge($this->options['extras'], $parsed['extras']);

		$this->name = $this->options['extras']['prefix'] . md5("$name:$type");

		$this->cache = new Memcache();

		$this->cache->addServer($this->options['host'], (int) $this->options['port']);

	}

	/**

	 * 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)

	{

		if ($data instanceof SimplePie)

		{

			$data = $data->data;

		}

		return $this->cache->set($this->name, serialize($data), MEMCACHE_COMPRESSED, (int) $this->options['extras']['timeout']);

	}

	/**

	 * Retrieve the data saved to the cache

	 *

	 * @return array Data for SimplePie::$data

	 */

	public function load()

	{

		$data = $this->cache->get($this->name);

		if ($data !== false)

		{

			return unserialize($data);

		}

		return false;

	}

	/**

	 * Retrieve the last modified time for the cache

	 *

	 * @return int Timestamp

	 */

	public function mtime()

	{

		$data = $this->cache->get($this->name);

		if ($data !== false)

		{

			// essentially ignore the mtime because Memcache expires on it's own

			return time();

		}

		return false;

	}

	/**

	 * Set the last modified time to the current time

	 *

	 * @return bool Success status

	 */

	public function touch()

	{

		$data = $this->cache->get($this->name);

		if ($data !== false)

		{

			return $this->cache->set($this->name, $data, MEMCACHE_COMPRESSED, (int) $this->duration);

		}

		return false;

	}

	/**

	 * Remove the cache

	 *

	 * @return bool Success status

	 */

	public function unlink()

	{

		return $this->cache->delete($this->name, 0);

	}

}