The IDataService interface provides information about the first available historical data of all data feeds.

Multiple feed types

Consider a strategy which retrieves times of first available data of the following data feeds of EUR/USD:

• daily candle sticks,
• ticks,
• renko bars.
• kagi bars
• line break bars
• point and figure bars

@Override
public void onStart(IContext context) throws JFException {
    console = context.getConsole();
    dataService = context.getDataService();

    long timeCandle =           dataService.getTimeOfFirstCandle(Instrument.EURUSD, Period.DAILY);
    long timeRenko =            dataService.getTimeOfFirstRenko(Instrument.EURUSD, Period.ONE_HOUR);
    long timeTick =             dataService.getTimeOfFirstCandle(Instrument.EURUSD, Period.TICK);
    long timeRange =            dataService.getTimeOfFirstRangeBar(Instrument.EURUSD, PriceRange.THREE_PIPS, DataInterpolationDescriptor.DEFAULT);
    long timeKagi =             dataService.getTimeOfFirstKagi(Instrument.EURUSD, Period.ONE_HOUR);
    long timeLineBreak =        dataService.getTimeOfFirstLineBreak(Instrument.EURUSD, Period.ONE_HOUR);
    long timePointAndFigure =   dataService.getTimeOfFirstPointAndFigure(Instrument.EURUSD, PriceRange.THREE_PIPS, ReversalAmount.ONE, DataInterpolationDescriptor.DEFAULT);

    print("daily candle=%s,\nrenko=%s,\ntick=%s,\nrange=%s,\nkagi=%s,\nline break=%s,\npoint and figure=%s",
          sdf.format(timeCandle),
          sdf.format(timeRenko),
          sdf.format(timeTick),
          sdf.format(timeRange),
          sdf.format(timeKagi),
          sdf.format(timeLineBreak),
          sdf.format(timePointAndFigure)
    );
}

private void print (String format, Object...args){
    console.getOut().println(String.format(format, args));
}

FirstDataTimes.java

Multiple candle periods

Consider a strategy which retrieves first historical data for multiple candle stick periods:

package jforex;

import java.util.List;

import com.dukascopy.api.*;
import com.dukascopy.api.util.DateUtils;
import static com.dukascopy.api.Period.*;

/**
 * The strategy retrieves first historical data for:
 * - all periods that get fed in IStrategy.onBar
 */
public class FirstDataTimesMultiPeriods implements IStrategy {

    private IDataService dataService;
    private IHistory history;
    private IConsole console;

    private Period[] periods = new Period[]{
             TEN_SECS, ONE_MIN, FIVE_MINS, TEN_MINS, FIFTEEN_MINS, THIRTY_MINS, ONE_HOUR, FOUR_HOURS, DAILY, WEEKLY, MONTHLY 
    };

    @Override
    public void onStart(IContext context) throws JFException {
        console = context.getConsole();
        history = context.getHistory();
        dataService = context.getDataService();

        for(Period period : periods){
            long timeCandle = dataService.getTimeOfFirstCandle(Instrument.EURUSD, period); 
            List<IBar> bars = null;
            try{
                long from = history.getBarStart(period, timeCandle + period.getInterval());
                long to = history.getBarStart(period, timeCandle + 2 * period.getInterval());
                bars = history.getBars(Instrument.EURUSD, period, OfferSide.BID, from, to);
            } catch (JFException e){
                console.getErr().println(e);
            }
            console.getOut().format("daily candle=%s bars from history: %s", DateUtils.format(timeCandle), bars ).println();
        }
    }

    @Override
    public void onTick(Instrument instrument, ITick tick) throws JFException {}
    @Override
    public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {}
    @Override
    public void onMessage(IMessage message) throws JFException {}
    @Override
    public void onAccount(IAccount account) throws JFException {}
    @Override
    public void onStop() throws JFException {}
}

FirstDataTimesMultiPeriods.java