video/system/libraries/Cache/drivers/Cache_apc.php

   1 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   2 /**
   3  * CodeIgniter
   4  *
   5  * An open source application development framework for PHP 5.1.6 or newer
   6  *
   7  * @package             CodeIgniter
   8  * @author              ExpressionEngine Dev Team
   9  * @copyright   Copyright (c) 2006 - 2012 EllisLab, Inc.
  10  * @license             http://codeigniter.com/user_guide/license.html
  11  * @link                http://codeigniter.com
  12  * @since               Version 2.0
  13  * @filesource
  14  */
  15
  16 // ------------------------------------------------------------------------
  17
  18 /**
  19  * CodeIgniter APC Caching Class
  20  *
  21  * @package             CodeIgniter
  22  * @subpackage  Libraries
  23  * @category    Core
  24  * @author              ExpressionEngine Dev Team
  25  * @link
  26  */
  27
  28 class CI_Cache_apc extends CI_Driver {
  29
  30         /**
  31          * Get
  32          *
  33          * Look for a value in the cache.  If it exists, return the data
  34          * if not, return FALSE
  35          *
  36          * @param       string
  37          * @return      mixed           value that is stored/FALSE on failure
  38          */
  39         public function get($id)
  40         {
  41                 $data = apc_fetch($id);
  42
  43                 return (is_array($data)) ? $data[0] : FALSE;
  44         }
  45
  46         // ------------------------------------------------------------------------
  47
  48         /**
  49          * Cache Save
  50          *
  51          * @param       string          Unique Key
  52          * @param       mixed           Data to store
  53          * @param       int                     Length of time (in seconds) to cache the data
  54          *
  55          * @return      boolean         true on success/false on failure
  56          */
  57         public function save($id, $data, $ttl = 60)
  58         {
  59                 return apc_store($id, array($data, time(), $ttl), $ttl);
  60         }
  61
  62         // ------------------------------------------------------------------------
  63
  64         /**
  65          * Delete from Cache
  66          *
  67          * @param       mixed           unique identifier of the item in the cache
  68          * @param       boolean         true on success/false on failure
  69          */
  70         public function delete($id)
  71         {
  72                 return apc_delete($id);
  73         }
  74
  75         // ------------------------------------------------------------------------
  76
  77         /**
  78          * Clean the cache
  79          *
  80          * @return      boolean         false on failure/true on success
  81          */
  82         public function clean()
  83         {
  84                 return apc_clear_cache('user');
  85         }
  86
  87         // ------------------------------------------------------------------------
  88
  89         /**
  90          * Cache Info
  91          *
  92          * @param       string          user/filehits
  93          * @return      mixed           array on success, false on failure
  94          */
  95          public function cache_info($type = NULL)
  96          {
  97                  return apc_cache_info($type);
  98          }
  99
 100         // ------------------------------------------------------------------------
 101
 102         /**
 103          * Get Cache Metadata
 104          *
 105          * @param       mixed           key to get cache metadata on
 106          * @return      mixed           array on success/false on failure
 107          */
 108         public function get_metadata($id)
 109         {
 110                 $stored = apc_fetch($id);
 111
 112                 if (count($stored) !== 3)
 113                 {
 114                         return FALSE;
 115                 }
 116
 117                 list($data, $time, $ttl) = $stored;
 118
 119                 return array(
 120                         'expire'        => $time + $ttl,
 121                         'mtime'         => $time,
 122                         'data'          => $data
 123                 );
 124         }
 125
 126         // ------------------------------------------------------------------------
 127
 128         /**
 129          * is_supported()
 130          *
 131          * Check to see if APC is available on this system, bail if it isn't.
 132          */
 133         public function is_supported()
 134         {
 135                 if ( ! extension_loaded('apc') OR ini_get('apc.enabled') != "1")
 136                 {
 137                         log_message('error', 'The APC PHP extension must be loaded to use APC Cache.');
 138                         return FALSE;
 139                 }
 140
 141                 return TRUE;
 142         }
 143
 144         // ------------------------------------------------------------------------
 145
 146
 147 }
 148 // End Class
 149
 150 /* End of file Cache_apc.php */
 151 /* Location: ./system/libraries/Cache/drivers/Cache_apc.php */