def execute(self, sources, sink, interval, alignment_stream=None):
        if not isinstance(interval, TimeInterval):
            raise TypeError('Expected TimeInterval, got {}'.format(type(interval)))
        if interval.end > sink.channel.up_to_timestamp:
            raise StreamNotAvailableError(sink.channel.up_to_timestamp)
        required_intervals = TimeIntervals([interval]) - sink.calculated_intervals
        if not required_intervals.is_empty:
            document_count = 0
            for interval in required_intervals:
                for stream_instance in self._execute(
                        sources=sources, alignment_stream=alignment_stream, interval=interval):
                    sink.writer(stream_instance)
                    document_count += 1
                sink.calculated_intervals += interval
            required_intervals = TimeIntervals([interval]) - sink.calculated_intervals
            if not required_intervals.is_empty:
                logging.error("{} execution error for time interval {} on stream {}".format(
                    self.name, interval, sink))
            if not document_count:
                logging.debug("{} did not produce any data for time interval {} on stream {}".format(
                    self.name, interval, sink))
            self.write_to_history(
                interval=interval,
                tool=self.name,
                document_count=document_count
            )