method iterates over the reprocessing queue and synchronizes state of every UOW with the DB
            should it change via the MX to STATE_CANCELED - remove the UOW from the queue

def validate(self):
        """ method iterates over the reprocessing queue and synchronizes state of every UOW with the DB
            should it change via the MX to STATE_CANCELED - remove the UOW from the queue """
        for process_name, q in self.reprocess_uows.items():
            if not q:
                continue

            invalid_entries = list()
            for entry in q.queue:
                assert isinstance(entry, PriorityEntry)
                uow = self.uow_dao.get_one(entry.entry.db_id)
                if uow.is_canceled:
                    invalid_entries.append(entry)

                thread_handler = self.managed_handlers[uow.process_name]
                assert isinstance(thread_handler, ManagedThreadHandler)
                if not thread_handler.process_entry.is_on:
                    invalid_entries.append(entry)

            for entry in invalid_entries:
                q.queue.remove(entry)

        self.logger.info('reprocessing queue validated')