system/libraries/drivers/Cache/Xcache.php

   1 <?php defined('SYSPATH') OR die('No direct access allowed.');
   2 /**
   3  * Xcache Cache driver.
   4  *
   5  * $Id: Xcache.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_Xcache_Driver implements Cache_Driver {
  13
  14         public function __construct()
  15         {
  16                 if ( ! extension_loaded('xcache'))
  17                         throw new Kohana_Exception('cache.extension_not_loaded', 'xcache');
  18         }
  19
  20         public function get($id)
  21         {
  22                 if (xcache_isset($id))
  23                         return xcache_get($id);
  24
  25                 return NULL;
  26         }
  27
  28         public function set($id, $data, $tags, $lifetime)
  29         {
  30                 count($tags) and Kohana::log('error', 'Cache: tags are unsupported by the Xcache driver');
  31
  32                 return xcache_set($id, $data, $lifetime);
  33         }
  34
  35         public function find($tag)
  36         {
  37                 Kohana::log('error', 'Cache: tags are unsupported by the Xcache driver');
  38                 return FALSE;
  39         }
  40
  41         public function delete($id, $tag = FALSE)
  42         {
  43                 if ($tag !== FALSE)
  44                 {
  45                         Kohana::log('error', 'Cache: tags are unsupported by the Xcache driver');
  46                         return TRUE;
  47                 }
  48                 elseif ($id !== TRUE)
  49                 {
  50                         if (xcache_isset($id))
  51                                 return xcache_unset($id);
  52
  53                         return FALSE;
  54                 }
  55                 else
  56                 {
  57                         // Do the login
  58                         $this->auth();
  59                         $result = TRUE;
  60                         for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++)
  61                         {
  62                                 if (xcache_clear_cache(XC_TYPE_VAR, $i) !== NULL)
  63                                 {
  64                                         $result = FALSE;
  65                                         break;
  66                                 }
  67                         }
  68
  69                         // Undo the login
  70                         $this->auth(TRUE);
  71                         return $result;
  72                 }
  73
  74                 return TRUE;
  75         }
  76
  77         public function delete_expired()
  78         {
  79                 return TRUE;
  80         }
  81
  82         private function auth($reverse = FALSE)
  83         {
  84                 static $backup = array();
  85
  86                 $keys = array('PHP_AUTH_USER', 'PHP_AUTH_PW');
  87
  88                 foreach ($keys as $key)
  89                 {
  90                         if ($reverse)
  91                         {
  92                                 if (isset($backup[$key]))
  93                                 {
  94                                         $_SERVER[$key] = $backup[$key];
  95                                         unset($backup[$key]);
  96                                 }
  97                                 else
  98                                 {
  99                                         unset($_SERVER[$key]);
 100                                 }
 101                         }
 102                         else
 103                         {
 104                                 $value = getenv($key);
 105
 106                                 if ( ! empty($value))
 107                                 {
 108                                         $backup[$key] = $value;
 109                                 }
 110
 111                                 $_SERVER[$key] = Kohana::config('cache_xcache.'.$key);
 112                         }
 113                 }
 114         }
 115
 116 } // End Cache Xcache Driver