Dukascopy Support Board • View topic

grosskt

........................
import com.dukascopy.api.IStrategy;
import com.dukascopy.api.IHighLowListener
............................
public class secStrategy implements IStrategy ,IHighLowListener {

@Override
public void onStart(IContext context) throws JFException {

}

....................
@Override
public void highUpdated(Instrument instrument, double high) {
//To change body of generated methods, choose Tools | Templates.
if (instrument.equals(Curinstrument))
{
this.maxHighPrice=high;
print(String.format(" cur high=%.5f",high));
}
}

@Override
public void lowUpdated(Instrument instrument, double low) {
//To change body of generated methods, choose Tools | Templates.
if(instrument.equals(this.Curinstrument))
{
this.minLowPrice=low;
print(String.format("cur min price=%.5f",low));
}
}
......................

}

Running all day, nothing happened！！！！

I don't understand why this is happening, someone told me how to use this interface!
!
thanks!

API Support

You need to add your IHighLowListener implementation to DataService. Otherwise he cannot receive information

context.getDataService().addHighLowListener(Period.DAILY, Instrument.EURUSD, this);

grosskt

The problem is still there!!!

Can you tell me what "this" means（）?

...........
I use this way:

public class myStrategy implements IStrategy, IHighLowListener {

      public Instrument Curinstrument = Instrument.USDJPY;
      private IDataService myDataService;
      private IHighLowListener myHighLowListener;
       private IContext context;
          ................................

     public void onStart(IContext context) throws JFException {

               [color=#0040FF]    myDataService = context.getDataService();
                    if (myDataService != null) {
                   
                     myDataService.addHighLowListener(Period.DAILY, Curinstrument, myHighLowListener);[/color]
              }

..........................

API Support

grosskt wrote:

Can you tell me what "this" means（）?

this refers to the current object
https://docs.oracle.com/javase/tutorial/java/javaOO/thiskey.html

grosskt wrote:

I use this way:

public class myStrategy implements IStrategy, IHighLowListener {

      public Instrument Curinstrument = Instrument.USDJPY;
      private IDataService myDataService;
      private IHighLowListener myHighLowListener;
       private IContext context;
          ................................

     public void onStart(IContext context) throws JFException {

               [color=#0040FF]    myDataService = context.getDataService();
                    if (myDataService != null) {
                   
                     myDataService.addHighLowListener(Period.DAILY, Curinstrument, myHighLowListener);[/color]
              }

You declared variable, but didn't initialize it. In this example myHighLowListener == null.

First option is to implement IHighLowListener interface inside your strategy, as in your first example, and then pass this into parameters.

Second option is to create IHighLowListener object, override methods, and then pass reference to this object in dataService.

    @Override
    public void onStart(IContext context) throws JFException {

        IHighLowListener myHighLowListener = new IHighLowListener() {
            @Override
            public void highUpdated(Instrument instrument, double high) {
                //your logic here
            }

            @Override
            public void lowUpdated(Instrument instrument, double low) {
                //your logic here
            }
        };

        context.getDataService().addHighLowListener(Period.ONE_MIN, Instrument.EURUSD, myHighLowListener);
    }

grosskt

Run these code:

     .........................
                      private IEngine engine;
                      private IHistory history;
                      private IConsole console;
                      private IDataService myDataService;
                      private IHighLowListener myHighLowListener;
                      private IContext context;
                ..................................................
                 public void onStart(IContext context) throws JFException {
                                 this.context = context;
                                 this.console = context.getConsole();
                                   this.engine = context.getEngine();
                                this.history = context.getHistory();
                                 myDataService = context.getDataService();  
                                 .........................
                                   Set<Instrument> instruments = new HashSet<Instrument>();
                                  instruments.add(Curinstrument);
                                   context.setSubscribedInstruments(instruments, true);
                                   ................................

                            if (myDataService != null) {
        
                                           myHighLowListener = new IHighLowListener() {
                                                 double _maxHighPrice=0,_minLowPrice=0;
                @Override
                public void highUpdated(Instrument instrument, double high)  {
                    //your logic here
                    try{
                     if(high!=0)
                          _maxHighPrice = high;
                    // console.getOut().println("cur min price=%.5f"+high);
                    }
                    catch(Exception et)
                    {
                        et.printStackTrace();
                        // console.getOut().println("HighUpdated exception"+et);
                    }
                }

                @Override
                public void lowUpdated(Instrument instrument, double low)  {
                    //your logic here
                    try
                    {
                       if(low!=0)
                         _minLowPrice = low;
                   // console.getOut().println("cur min price=%.5f"+low);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                      //  console.getOut().println("lowUpdated exception"+e);
                    }
                }
            
            };
            if(myHighLowListener!=null)
            myDataService.addHighLowListener(Period.DAILY, Curinstrument, myHighLowListener);
            //myDataService.
            else
                 console.getOut().println("create highlowlistener exception");
             ...............................

in netbean platom exception found :

2018-05-02 16:40:13.697 ERROR AbstractStrategyRateDataNotificationManager -
java.lang.NullPointerException
at com.dukascopy.charts.data.datacache.hl.HighLowManager.scheduleToFillPreviousCandle(HighLowManager.java:302)
at com.dukascopy.charts.data.datacache.hl.HighLowManager.newCandle(HighLowManager.java:222)
at com.dukascopy.api.impl.connect.JForexHighLowManager.newCandle(JForexHighLowManager.java:112)
at com.dukascopy.dds2.greed.agent.strategy.tester.listener.TesterHighLowManager.onBar(TesterHighLowManager.java:138)
at com.dukascopy.dds2.greed.agent.strategy.notification.candle.StrategyCandleNotificationManager.onBar(StrategyCandleNotificationManager.java:91)
at com.dukascopy.dds2.greed.agent.strategy.notification.candle.StrategyCandleNotificationManager.onBar(StrategyCandleNotificationManager.java:27)
at com.dukascopy.dds2.greed.agent.strategy.notification.AbstractStrategyRateDataNotificationManager.historicalBarReceived(AbstractStrategyRateDataNotificationManager.java:339)
at com.dukascopy.dds2.greed.agent.strategy.tester.AbstractStrategyRunner.historicalCandleReceived(AbstractStrategyRunner.java:465)
at com.dukascopy.dds2.greed.agent.strategy.tester.StrategyTesterRunner.run(StrategyTesterRunner.java:348)
at java.lang.Thread.run(Thread.java:748)
2018-05-02 16:40:13.698 ERROR AbstractStrategyRateDataNotificationManager -