鏌鋣革命緩存動態地生成佔位符

Question

我如何緩存（使用鏌鋣的CacheManager中），動態佔位符我生成這裏：

// recursive function to generate our un-ordered list of menu items 
if(!function_exists('GenerateMenu')){ 
    function GenerateMenu($level, $parent = 0, $wc, $wi, $we, $cs, $sc, $cl){ 
     try { 
      $lvl = ++$level; 
      global $modx; 
      // Check for #1, should this be cached, #2 does it already exist in the cache 
      $cached = $modx->cacheManager->get('Navigator'); 
      if($sc && isset($cached)){ 
       // need to get the placeholders from cache - here somehow! 
       return $cached; 
      }else{ 
       // get the site start 
       $siteStartId = $modx->getOption('site_start'); 
       // Set our initial rows array 
       $rows = array(); 
       // Run our query to get our menu items 
       $sql = 'Select `id`, `menutitle`, `uri`, `longtitle`, `parent`, `link_attributes`, `class_key`, `content`, `alias`, `introtext` 
            From `' . $modx->getOption(xPDO::OPT_TABLE_PREFIX) . 'site_content` 
            Where `deleted` = 0 AND `hidemenu` = 0 AND `published` = 1 AND `parent` = :parent 
            Order by `parent`, `menuindex`'; 
       $query = new xPDOCriteria($modx, $sql, array(':parent' => $parent)); 
       if ($query->stmt && $query->stmt->execute()) { 
        $rows = $query->stmt->fetchAll(PDO::FETCH_ASSOC); 
       } 
       // do some cleanup 
       unset($query, $sql); 
       // make sure we have some rows, and then build our html for the menu 
       if($rows){ 
        // grab a count of our results 
        $rCt = count($rows); 
        $cls = ($lvl > 1) ? 'sub-item-' . $lvl : 'main-item-' . $lvl; 
        $ret .= ' <ul class="' . $cls . '" id="' . $cls . '-' . $parent . '">' . "\r\n"; 
        for($i = 0; $i < $rCt; ++$i){ 
         // if this resource is a WebLink, show the content in it, as the URL for the href tag, otherwise, use the resource's URI 
         $url = ($rows[$i]['class_key'] == 'modWebLink') ? $rows[$i]['content'] : '/' . $rows[$i]['uri']; 
         // Check for the site's start id, if true, show a "blank" link, otherwise show the $url 
         $showUrl = ($siteStartId == $rows[$i]['id']) ? '/' : $url; 
         $la = (strlen($rows[$i]['link_attributes']) > 0) ? ' ' . $rows[$i]['link_attributes'] : null; 
         // Set some dynamic placeholders, they can only be used ont he pages that contain this snippet 
         $modx->toPlaceholders(array('Title-' . $rows[$i]['id'] => $rows[$i]['longtitle'], 
                'MenuTitle-' . $rows[$i]['id'] => $rows[$i]['menutitle'], 
                'URL-' . $rows[$i]['id'] => $showUrl), 
               'link'); 
         $ret .= '  <li class="' . $cls . '" id="' . $rows[$i]['alias'] . '">' . "\r\n"; 
         $ret .= '   <a href="' . $showUrl . '" title="' . $rows[$i]['longtitle'] . '"' . $la . '>' . $rows[$i]['menutitle'] . '</a>' . "\r\n"; 
         $ret .= GenerateMenu($lvl, $rows[$i]['id']); 
         // Check for a snippet, and render it 
         $it = $rows[$i]['introtext']; 
         if($cs && IsSnippet($it)){ 
          // if we find a snippet in the Summary field, run it, and attach it to our output 
          preg_match('/\[\[!?(.*)\]\]/', $it, $sm); 
          $ret .= $modx->runSnippet($sm[1]); 
          // clean up 
          unset($sm); 
         } 
         $ret .= '  </li>' . "\r\n"; 
        } 
        $ret .= ' </ul>' . "\r\n"; 
       } 
       // clean up 
       unset($rows);   
       // Check to see if we should cache it, if so, set it to cache, and apply the length of time it should be cached for: defaults to 2 hours 
       if($sc){ 
        // NEED TO SET THE PLACEHOLDERS TO CACHE SOMEHOW 
        $modx->cacheManager->set('Navigator', $ret, $cl); 
       } 
       // return the menu 
       return $ret; 
      } 
     } catch(Exception $e) { 
      // If there was an error, make sure to write it out to the modX Error Log 
      $modx->log(modX::LOG_LEVEL_ERROR, '[Navigator] Error: ' . $e->getMessage()); 
      return null; 
     } 
    } 
} 

Answer 1

最簡單的解決方案可能是pdoTools它允許你在運行時建立緩存。

http://www.shawnwilkerson.com/modx/tags/pdotools/

另外，我不認爲資源佔位符緩存，是有你的項目cahced最好的地方：

  case '+': 
       $tagName= substr($tagName, 1 + $tokenOffset); 
       $element= new modPlaceholderTag($this->modx); 
       $element->set('name', $tagName); 
       $element->setTag($outerTag); 
       $elementOutput= $element->process($tagPropString); 
       break; 

從https://github.com/modxcms/revolution/blob/master/core/model/modx/modparser.class.php#L455

您可以行455-461注意其他標籤類型有：

$element->setCacheable($cacheable); 

我在書中的附錄D中介紹瞭解析器。我在2011年發現了一些Jason糾正的問題。

Answer 2

移動toPlaceholders()到腳本的結束，而是緩存佔位符數據的陣列：

// attempt to retrieve placeholders from cache 
$placeholders = $modx->cacheManager->get('Navigator'); 

// if not in cache, run your snippet logic and generate the data 
if (empty($placeholders))) { 
    $placeholders = array(
     'myplaceholder' => 'placeholder data' 
    ); 
    $modx->cacheManager->set('Navigator', $placeholders, $cl); 
} 

// set placeholders for use by MODX 
$modx->toPlaceholders($placeholders);