code: def execute_tool(self, stream, interval):
          
          if interval.end > self.up_to_timestamp:
              raise ValueError(
                  'The stream is not available after ' + str(self.up_to_timestamp) + ' and cannot be calculated')
  
          required_intervals = TimeIntervals([interval]) - stream.calculated_intervals
          if not required_intervals.is_empty:
              for interval in required_intervals:
                  stream.tool.execute(stream.input_streams, stream, interval)
                  stream.calculated_intervals += interval
  
              if not stream.required_intervals.is_empty:
                  raise RuntimeError('Tool execution did not cover the specified time interval.')
docs: Executes the stream's tool over the given time interval
  
          :param stream: the stream reference
          :param interval: the time interval
          :return: None