<?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

 */

/**

 * Caches data to memcached

 *

 * Registered for URLs with the "memcached" protocol

 *

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

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

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

 *

 * @package    SimplePie

 * @subpackage Caching

 * @author     Paul L. McNeely

 * @uses       Memcached

 */

class SimplePie_Cache_Memcached implements SimplePie_Cache_Base

{

    /**

     * Memcached instance

     * @var Memcached

     */

    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_',

            ),

        );

        $this->options = SimplePie_Misc::array_merge_recursive($this->options, SimplePie_Cache::parse_URL($location));

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

        $this->cache = new Memcached();

        $this->cache->addServer($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 $this->setData(serialize($data));

    }

    /**

     * 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 . '_mtime');

        return (int) $data;

    }

    /**

     * Set the last modified time to the current time

     * @return bool Success status

     */

    public function touch() {

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

        return $this->setData($data);

    }

    /**

     * Remove the cache

     * @return bool Success status

     */

    public function unlink() {

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

    }

    /**

     * Set the last modified time and data to Memcached

     * @return bool Success status

     */

    private function setData($data) {

        if ($data !== false) {

            $this->cache->set($this->name . '_mtime', time(), (int)$this->options['extras']['timeout']);

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

        }

        return false;

    }

}