def invoke_task(self, method, **kwargs):
        """Execute a \*_Task method and wait for it to complete.
        
        :param method: The \*_Task method to invoke.
        :type method: str
        :param kwargs: The arguments to pass to the method.
        :type kwargs: TODO

        """
        # Don't execute methods which don't return a Task object
        if not method.endswith('_Task'):
            logger.error('invoke_task can only be used for methods which '
                  'return a ManagedObjectReference to a Task.')
            return None

        task_mo_ref = self.invoke(method=method, **kwargs)
        task = Task(task_mo_ref, self)
        task.update_view_data(properties=['info'])
        # TODO: This returns true when there is an error
        while True:
            if task.info.state == 'success':
                return task
            elif task.info.state == 'error':
                # TODO: Handle error checking properly
                raise TaskFailedError(task.info.error.localizedMessage)

            # TODO: Implement progresscallbackfunc
            # Sleep two seconds and then refresh the data from the server
            time.sleep(2)
            task.update_view_data(properties=['info'])