[Vedi sommario] [Stampa] [Vedi testo]

   1  <?PHP
   2  /**
   3   * patTemplate Template cache that stores data on filesystem
   4   *
   5   * $Id: File.php 10381 2008-06-01 03:35:53Z pasamio $
   6   *
   7   * @package        patTemplate
   8   * @subpackage    Caches
   9   * @author        Stephan Schmidt <schst@php.net>
  10   */
  11  
  12  // Check to ensure this file is within the rest of the framework
  13  defined('JPATH_BASE') or die();
  14  
  15  /**
  16   * patTemplate Template cache that stores data on filesystem
  17   *
  18   * $Id: File.php 10381 2008-06-01 03:35:53Z pasamio $
  19   *
  20   * Possible parameters for the cache are:
  21   * - cacheFolder : set the folder from which to load the cache
  22   * - lifetime : seconds for which the cache is valid, if set to auto, it will check
  23   *   whether the cache is older than the original file (if the reader supports this)
  24   * - prefix for the filenames
  25   *
  26   * @package        patTemplate
  27   * @subpackage    Caches
  28   * @author        Stephan Schmidt <schst@php.net>
  29   */
  30  class patTemplate_TemplateCache_File extends patTemplate_TemplateCache
  31  {
  32      /**
  33      * parameters of the cache
  34      *
  35      * @access    private
  36      * @var        array
  37      */
  38      var $_params = array(
  39                           'cacheFolder' => './cache',
  40                           'lifetime'       => 'auto',
  41                           'prefix'       => '',
  42                           'filemode'    => null
  43                          );
  44  
  45  
  46      /**
  47      * load template from cache
  48      *
  49      * @access    public
  50      * @param    string            cache key
  51      * @param    integer            modification time of original template
  52      * @return    array|boolean    either an array containing the templates or false cache could not be loaded
  53      */
  54  	function load($key, $modTime = -1)
  55      {
  56          $filename = $this->_getCachefileName( $key );
  57          if (!file_exists($filename) || !is_readable($filename)) {
  58              return false;
  59          }
  60  
  61          $generatedOn = filemtime( $filename );
  62          $ttl         = $this->getParam('lifetime');
  63          if ($ttl == 'auto') {
  64              if ($modTime < 1) {
  65                  return false;
  66              }
  67              if ($modTime > $generatedOn) {
  68                  return false;
  69              }
  70              return unserialize(file_get_contents($filename));
  71          } elseif(is_int( $ttl)) {
  72              if ($generatedOn + $ttl < time()) {
  73                  return false;
  74              }
  75              return unserialize( file_get_contents( $filename ) );
  76          }
  77  
  78          return false;
  79      }
  80  
  81      /**
  82      * write template to cache
  83      *
  84      * @access    public
  85      * @param    string        cache key
  86      * @param    array        templates to store
  87      * @return    boolean        true on success
  88      */
  89  	function write( $key, $templates )
  90      {
  91          $cacheFile = $this->_getCachefileName($key);
  92          $fp = @fopen($cacheFile, 'w');
  93          if (!$fp) {
  94              return false;
  95          }
  96          flock( $fp, LOCK_EX );
  97          fputs( $fp, serialize($templates));
  98          flock( $fp, LOCK_UN );
  99          $filemode = $this->getParam('filemode');
 100          if ($filemode !== null) {
 101              chmod($cacheFile, $filemode);
 102          }
 103          return true;
 104      }
 105  
 106      /**
 107      * get the cache filename
 108      *
 109      * @access    private
 110      * @param    string        cache key
 111      * @return    string        cache file name
 112      */
 113  	function _getCachefileName( $key )
 114      {
 115          return $this->getParam( 'cacheFolder' ) . '/' . $this->getParam( 'prefix' ).$key . '.cache';
 116      }
 117  }
 118  ?>