| public lock ( $onChanged = null ) |
public function lock($onChanged = null)
{
$lock = new Locking\PessimisticLock($this);
$locked = $lock->acquire();
if (is_callable($onChanged) && !$locked->equals($this)) {
call_user_func($onChanged, $this, $locked);
}
// reload data from locked
$this->_data = $locked->_data;
return $this;
}