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   1  <?php
   2  /*
   3   * Limb PHP Framework
   4   *
   5   * @link http://limb-project.com 
   6   * @copyright  Copyright &copy; 2004-2007 BIT(http://bit-creative.com)
   7   * @license    LGPL http://www.gnu.org/copyleft/lesser.html 
   8   */
   9  lmb_require('limb/cache/src/lmbCachePersister.interface.php');
  10  lmb_require('limb/core/src/lmbSerializable.class.php');
  11  lmb_require('limb/fs/src/lmbFs.class.php', false);
  12  
  13  @define('LIMB_CACHE_FILE_PREFIX', 'cache_');
  14  
  15  /**

  16   * class lmbCacheFilePersister.

  17   *

  18   * @package cache

  19   * @version $Id: lmbCacheFilePersister.class.php 5945 2007-06-06 08:31:43Z pachanga $

  20   */
  21  class lmbCacheFilePersister implements lmbCachePersister
  22  {
  23    protected $cache_dir;
  24    protected $id;
  25  
  26    function __construct($cache_dir, $id = 'cache')
  27    {
  28      $this->cache_dir = $cache_dir;
  29      $this->id = $id;
  30      lmbFs :: mkdir($this->cache_dir);
  31    }
  32  
  33    function getId()
  34    {
  35      return $this->id;
  36    }
  37  
  38    function getCacheDir()
  39    {
  40      return $this->cache_dir;
  41    }
  42  
  43    function put($key, $value, $group = 'default')
  44    {
  45      $file = $this->_getCacheFilePath($group, $key);
  46  
  47      $container = new lmbSerializable($value);
  48      lmbFs :: safeWrite($file, serialize($container));
  49    }
  50  
  51    function get($key, $group = 'default')
  52    {
  53      $file = $this->_getCacheFilePath($group, $key);
  54  
  55      if(!file_exists($file))
  56        return LIMB_CACHE_NULL_RESULT;
  57  
  58      $container = unserialize(file_get_contents($file));
  59      return $container->getSubject();
  60    }
  61  
  62    function flushValue($key, $group = 'default')
  63    {
  64      $this->_removeFileCache($group, $key);
  65    }
  66  
  67    function flushGroup($group)
  68    {
  69      $this->_removeFileCache($group);
  70    }
  71  
  72    function flushAll()
  73    {
  74      $this->_removeFileCache();
  75    }
  76  
  77    protected function _removeFileCache($group = false, $key = false)
  78    {
  79      if($key === false)
  80      {
  81        $files = lmbFs :: find($this->cache_dir, 'f', '~^' . preg_quote($this->_getCacheFilePrefix($group)) . '~');
  82        foreach($files as $file)
  83          @unlink($file);
  84      }
  85      else
  86        @unlink($this->_getCacheFilePath($group, $key));
  87    }
  88  
  89    protected function _getCacheFilePrefix($group = false)
  90    {
  91      return LIMB_CACHE_FILE_PREFIX . ($group ? $group : '');
  92    }
  93  
  94    protected function _getCacheFileName($group, $key)
  95    {
  96      return $this->_getCacheFilePrefix($group) . '_' . $key . '.cache';
  97    }
  98  
  99    protected function _getCacheFilePath($group, $key)
 100    {
 101      return $this->cache_dir . '/' . $this->_getCacheFileName($group, $key);
 102    }
 103  }
 104  ?>