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<?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);

        }

}