/**
  * get folder cache counts from database
  *
  * @param Expressomail_Model_Folder $_folder
  * @param Expressomail_Backend_Imap|boolean $_imap
  * @return array  counters of totcal count and unread count
  */
 public function getCacheFolderCounter(Expressomail_Model_Folder $_folder)
 {
     $result = $this->_backend->getFolderCounter($_folder);
     return $result;
 }