system/libraries/drivers/Cache/Memcache.php

   1 <?php defined('SYSPATH') OR die('No direct access allowed.');
   2 /**
   3  * Memcache-based Cache driver.
   4  *
   5  * $Id: Memcache.php 3917 2009-01-21 03:06:22Z zombor $
   6  *
   7  * @package    Cache
   8  * @author     Kohana Team
   9  * @copyright  (c) 2007-2008 Kohana Team
  10  * @license    http://kohanaphp.com/license.html
  11  */
  12 class Cache_Memcache_Driver implements Cache_Driver {
  13
  14         // Cache backend object and flags
  15         protected $backend;
  16         protected $flags;
  17
  18         public function __construct()
  19         {
  20                 if ( ! extension_loaded('memcache'))
  21                         throw new Kohana_Exception('cache.extension_not_loaded', 'memcache');
  22
  23                 $this->backend = new Memcache;
  24                 $this->flags = Kohana::config('cache_memcache.compression') ? MEMCACHE_COMPRESSED : 0;
  25
  26                 $servers = Kohana::config('cache_memcache.servers');
  27
  28                 foreach ($servers as $server)
  29                 {
  30                         // Make sure all required keys are set
  31                         $server += array('host' => '127.0.0.1', 'port' => 11211, 'persistent' => FALSE);
  32
  33                         // Add the server to the pool
  34                         $this->backend->addServer($server['host'], $server['port'], (bool) $server['persistent'])
  35                                 or Kohana::log('error', 'Cache: Connection failed: '.$server['host']);
  36                 }
  37         }
  38
  39         public function find($tag)
  40         {
  41                 return FALSE;
  42         }
  43
  44         public function get($id)
  45         {
  46                 return (($return = $this->backend->get($id)) === FALSE) ? NULL : $return;
  47         }
  48
  49         public function set($id, $data, $tags, $lifetime)
  50         {
  51                 count($tags) and Kohana::log('error', 'Cache: Tags are unsupported by the memcache driver');
  52
  53                 // Memcache driver expects unix timestamp
  54                 if ($lifetime !== 0)
  55                 {
  56                         $lifetime += time();
  57                 }
  58
  59                 return $this->backend->set($id, $data, $this->flags, $lifetime);
  60         }
  61
  62         public function delete($id, $tag = FALSE)
  63         {
  64                 if ($id === TRUE)
  65                         return $this->backend->flush();
  66
  67                 if ($tag == FALSE)
  68                         return $this->backend->delete($id);
  69
  70                 return TRUE;
  71         }
  72
  73         public function delete_expired()
  74         {
  75                 return TRUE;
  76         }
  77
  78 } // End Cache Memcache Driver