Dear Community/Support

What is the recommended method for getting indicator values based on 1HR period, at a smaller period, say 15 minute or 30 minute?

For example if we have an onBar implementation like below, it will calculate the value of linear regression every 1HR bar.
But I would like to get the value of the 1HR period linear regression halfway through the 1HR - at the 30M mark - how can I calculate the value of the 1HR period linear regression every time onBar receives a Period.THIRTY_MINS bar?

public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException 
{     
      if (period == Period.ONE_HOUR)
      {
            try 
            {       
                   IBar currentBidBar = _history.getBar(instrument, _period, OfferSide.BID, 0); 
              IBar closedBar = _history.getBar(instrument, _period, OfferSide.BID, 1); 
                       
              long closedBarTime = _history.getBarStart(_period, closedBar.getTime()); 
              long openedBarTime = currentBidBar.getTime(); 
                       
              // linear regression 
              Object[] values;
                       
              values = indicators.calculateIndicator(instrument, 
                                      _period, 
                                      new  OfferSide[] {OfferSide.BID }, 
                                      "LINEARREG", 
                                      new IIndicators.AppliedPrice[] { IIndicators.AppliedPrice.CLOSE }, 
                                      new Object[] { _lrPeriod }, 
                                      Filter.WEEKENDS,
                                      2,
                                      closedBarTime,
                                      0);        
                       
                double[] lrValues = (double[]) values[0];
                double lr =  lrValues[1];
                double lr1 =  lrValues[0];
   
            }
            catch (JFException e) 
            {
                e.printStackTrace();
            }

         }
    }

Try something like this:

   public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {
      if (period == Period.THIRTY_MINS) {
         try {
            long curr1HBarStartTime = _history.getBar(instrument, Period.ONE_HOUR, OfferSide.BID, 0).getTime();
            // linear regression
            Object[] values = indicators.calculateIndicator(instrument, Period.ONE_HOUR, new OfferSide[] { OfferSide.BID }, "LINEARREG",
                  new IIndicators.AppliedPrice[] { IIndicators.AppliedPrice.CLOSE }, new Object[] { _lrPeriod }, Filter.WEEKENDS, 2,
                  curr1HBarStartTime, 0);

            double[] lrValues = (double[]) values[0];
            double lr = lrValues[1];
            double lr1 = lrValues[0];

         } catch (JFException e) {
            e.printStackTrace();
         }
      }
   }

I'd just like to point out that your suggestion does not actually get you the mid-1HR-bar values. The solution for this (getting a 1HR indicator value every 15M or 30M bar) is actually much, much more complex.