import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.ejb.*;

/**
 *
 * @author kumm
 */
@Singleton
@Startup
public class TimerTester {

    private static final Logger logger = Logger.getLogger(TimerTester.class.getName());
    private static final String TIME_LOG_FORMAT = "yyyy.MM.dd HH:mm";
    @Resource
    private TimerService timerService;
    private SimpleDateFormat simpleDateFormat = new SimpleDateFormat(TIME_LOG_FORMAT);

    @PostConstruct
    public void init() { 
        Locale[] availableLocales = Locale.getAvailableLocales();
        Locale localeDefault = Locale.getDefault();
        for (int i = 0; i < availableLocales.length; i++) {
            Locale.setDefault(availableLocales[i]);
            initTimer();
        }
        Locale.setDefault(localeDefault);
    }

    public void initTimer() {
        TimerConfig timerConfig = new TimerConfig("Every Sunday in "+Locale.getDefault(), false);
        ScheduleExpression sheduleExpression = new ScheduleExpression().
                dayOfWeek(0).
                hour(12).
                minute(0);
        Timer timer = timerService.createCalendarTimer(sheduleExpression, timerConfig);
        dump(timer);
    }

    private void dump(Timer timer) {
        logger.log(Level.INFO, "{0} starts with {1}", new Object[]{timer.getInfo(), dateToStr(timer.getNextTimeout())});
    }

    private String dateToStr(Date date) {
        return simpleDateFormat.format(date);
    }

    @Timeout
    public void ejbTimeout(Timer timer) {
        logger.log(Level.INFO, "ejbTimeout({0})", new Object[]{timer.getInfo()});
    }
}