code: protected void actionDropingOff(double extrp)
      {
          progress -= speed * extrp;
          final int curProgress = (int) Math.floor(progress);
  
          // Check ended
          if (curProgress <= 0)
          {
              for (final ExtractorListener listener : listeners)
              {
                  listener.notifyDroppedOff(resourceType, lastProgress);
              }
              startExtraction();
          }
      }
docs: Action called from update extraction in drop off state.
  
  @param extrp extrapolation value.