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Dir : ~/usr/share/psa-pear/pear/php/Horde/Cache/Storage/
View File Name : Memcache.php

<?php
/**
 * Copyright 2006-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @category  Horde
 * @copyright 2006-2017 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package   Cache
 */

/**
 * Cache storage on a memcache installation.
 *
 * @author     Duck <duck@obala.net>
 * @author     Michael Slusarz <slusarz@horde.org>
 * @category   Horde
 * @copyright  2006-2016 Horde LLC
 * @deprecated Use HashTable driver instead.
 * @license    http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package    Cache
 */
class Horde_Cache_Storage_Memcache extends Horde_Cache_Storage_Base
{
    /**
     * Cache results of exists()/get() calls (since we will get the entire
     * object on an exists() call anyway).
     *
     * @var array
     */
    protected $_objectcache = array();

    /**
     * Memcache object.
     *
     * @var Horde_Memcache
     */
    protected $_memcache;

    /**
     * Construct a new Horde_Cache_Memcache object.
     *
     * @param array $params  Parameter array:
     * <pre>
     *   - memcache: (Horde_Memcache) [REQUIRED] A Horde_Memcache object.
     *   - prefix: (string) The prefix to use for the cache keys.
     *             DEFAULT: ''
     * </pre>
     */
    public function __construct(array $params = array())
    {
        if (!isset($params['memcache'])) {
            if (isset($params['hashtable'])) {
                $params['memcache'] = $params['hashtable'];
            } else {
                throw new InvalidArgumentException('Missing memcache object');
            }
        }

        parent::__construct(array_merge(array(
            'prefix' => '',
        ), $params));
    }

    /**
     */
    protected function _initOb()
    {
        $this->_memcache = $this->_params['memcache'];
    }

    /**
     */
    public function get($key, $lifetime = 0)
    {
        $original_key = $key;
        $key = $this->_params['prefix'] . $key;
        if (isset($this->_objectcache[$key])) {
            return $this->_objectcache[$key];
        }

        $key_list = array($key);
        if (!empty($lifetime)) {
            $key_list[] = $key . '_e';
        }

        $res = $this->_memcache->get($key_list);

        if ($res === false) {
            return $this->_objectcache[$key] = false;
        }

        // If we can't find the expire time, assume we have exceeded it.
        if (empty($lifetime) ||
            (($res[$key . '_e'] !== false) &&
             ($res[$key . '_e'] + $lifetime > time()))) {
            $this->_objectcache[$key] = $res[$key];
        } else {
            $this->expire($original_key);
            return false;
        }

        return $res[$key];
    }

    /**
     */
    public function set($key, $data, $lifetime = 0)
    {
        $key = $this->_params['prefix'] . $key;

        if ($this->_memcache->set($key . '_e', time(), $lifetime) !== false) {
            $this->_memcache->set($key, $data, $lifetime);
            unset($this->_objectcache[$key]);
        }
    }

    /**
     */
    public function exists($key, $lifetime = 0)
    {
        return ($this->get($key, $lifetime) !== false);
    }

    /**
     */
    public function expire($key)
    {
        $key = $this->_params['prefix'] . $key;
        $this->_objectcache[$key] = false;
        $this->_memcache->delete($key . '_e');

        return $this->_memcache->delete($key);
    }

    /**
     */
    public function clear()
    {
        $this->_memcache->flush();
        $this->_objectcache = array();
    }

}