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/**
 * 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 &quot;AS IS&quot; 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 &quot;memcached&quot; protocol
 *
 * For example, `memcached://localhost:11211/?timeout=3600&amp;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-&gt;options = array(
            'host'   =&gt; '127.0.0.1',
            'port'   =&gt; 11211,
            'extras' =&gt; array(
                'timeout' =&gt; 3600, // one hour
                'prefix'  =&gt; 'simplepie_',
            ),
        );
        $this-&gt;options = SimplePie_Misc::array_merge_recursive($this-&gt;options, SimplePie_Cache::parse_URL($location));

        $this-&gt;name = $this-&gt;options['extras']['prefix'] . md5(&quot;$name:$type&quot;);

        $this-&gt;cache = new Memcached();
        $this-&gt;cache-&gt;addServer($this-&gt;options['host'], (int)$this-&gt;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-&gt;data;
        }

        return $this-&gt;setData(serialize($data));
    }

    /**
     * Retrieve the data saved to the cache
     * @return array Data for SimplePie::$data
     */
    public function load() {
        $data = $this-&gt;cache-&gt;get($this-&gt;name);

        if ($data !== false) {
            return unserialize($data);
        }
        return false;
    }

    /**
     * Retrieve the last modified time for the cache
     * @return int Timestamp
     */
    public function mtime() {
        $data = $this-&gt;cache-&gt;get($this-&gt;name . '_mtime');
        return (int) $data;
    }

    /**
     * Set the last modified time to the current time
     * @return bool Success status
     */
    public function touch() {
        $data = $this-&gt;cache-&gt;get($this-&gt;name);
        return $this-&gt;setData($data);
    }

    /**
     * Remove the cache
     * @return bool Success status
     */
    public function unlink() {
        return $this-&gt;cache-&gt;delete($this-&gt;name, 0);
    }

    /**
     * Set the last modified time and data to Memcached
     * @return bool Success status
     */
    private function setData($data) {

        if ($data !== false) {
            $this-&gt;cache-&gt;set($this-&gt;name . '_mtime', time(), (int)$this-&gt;options['extras']['timeout']);
            return $this-&gt;cache-&gt;set($this-&gt;name, $data, (int)$this-&gt;options['extras']['timeout']);
        }

        return false;
    }
}
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