original_string: public function extend_lock(lock $lock, $maxlifetime = 86400) {
          $now = time();
          $expires = $now + $maxlifetime;
          $params = array('expires' => $expires,
                          'token' => $lock->get_key());
  
          $sql = 'UPDATE {lock_db}
                      SET
                          expires = :expires,
                      WHERE
                          owner = :token';
  
          $this->db->execute($sql, $params);
          $countparams = array('owner' => $lock->get_key());
          $result = $this->count_records('lock_db', $countparams);
  
          return $result === 0;
      }
code: public function extend_lock(lock $lock, $maxlifetime = 86400) {
          $now = time();
          $expires = $now + $maxlifetime;
          $params = array('expires' => $expires,
                          'token' => $lock->get_key());
  
          $sql = 'UPDATE {lock_db}
                      SET
                          expires = :expires,
                      WHERE
                          owner = :token';
  
          $this->db->execute($sql, $params);
          $countparams = array('owner' => $lock->get_key());
          $result = $this->count_records('lock_db', $countparams);
  
          return $result === 0;
      }
code_tokens: public function extend_lock ( lock $ lock , $ maxlifetime = 86400 ) { $ now = time ( ) ; $ expires = $ now + $ maxlifetime ; $ params = array ( 'expires' => $ expires , 'token' => $ lock -> get_key ( ) ) ; $ sql = 'UPDATE {lock_db}
                      SET
                          expires = :expires,
                      WHERE
                          owner = :token' ; $ this -> db -> execute ( $ sql , $ params ) ; $ countparams = array ( 'owner' => $ lock -> get_key ( ) ) ; $ result = $ this -> count_records ( 'lock_db' , $ countparams ) ; return $ result === 0 ; }
docstring: Extend a lock that was previously obtained with @lock.
  @param lock $lock - a lock obtained from this factory.
  @param int $maxlifetime - the new lifetime for the lock (in seconds).
  @return boolean - true if the lock was extended.
docstring_tokens: Extend a lock that was previously obtained with