/**
  * Are article comments enabled for context title?
  */
 private function checkArticleComments()
 {
     $this->isArticleComments = class_exists('ArticleComment') && ArticleCommentInit::ArticleCommentCheckTitle($this->contextTitle);
     return $this->isArticleComments;
 }
 /**
  * Get number of article comments for current page (if enabled) or get number of revisions of talk page
  */
 public function getCommentsCount()
 {
     wfProfileIn(__METHOD__);
     global $wgMemc;
     if (!is_null($this->mTitle)) {
         $title = $this->mTitle;
     } else {
         $title = Title::newFromId($this->pageId);
     }
     // don't perform for talk pages or special pages
     if (empty($title) || $title->isTalkPage() || $title->isSpecialPage()) {
         wfProfileOut(__METHOD__);
         return 0;
     }
     // try to get cached data
     $key = $this->getKey('comments6');
     $ret = $wgMemc->get($key);
     if (!is_numeric($ret)) {
         wfProfileIn(__METHOD__ . '::miss');
         // new comments extension
         if (self::isArticleCommentsEnabled() && ArticleCommentInit::ArticleCommentCheckTitle($title)) {
             // get number of article comments
             $commentList = ArticleCommentList::newFromTitle($title);
             $data = $commentList->getData();
             $ret = $data['countCommentsNested'];
             wfDebug(__METHOD__ . "::miss - using comments count\n");
         } else {
             // get number of revisions of talk page
             $talkPage = $title->getTalkPage();
             // check if talk page exists
             if (!empty($talkPage) && $talkPage->exists()) {
                 $dbr = wfGetDB(DB_SLAVE);
                 $ret = $dbr->selectField('revision', 'count(*)', array('rev_page' => $talkPage->getArticleId()), __METHOD__);
             } else {
                 $ret = 0;
             }
             wfDebug(__METHOD__ . "::miss - using talk page revisions count\n");
         }
         $wgMemc->set($key, $ret, self::CACHE_TTL);
         wfProfileOut(__METHOD__ . '::miss');
     }
     wfProfileOut(__METHOD__);
     return intval($ret);
 }