package dk.thoerup.schedulesamples;

import java.io.Serializable;

import java.util.Calendar;
import java.util.Date;

import javax.annotation.Resource;
import javax.ejb.ScheduleExpression;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;
import javax.ejb.TimedObject;
import javax.ejb.Timeout;
import javax.ejb.Timer;
import javax.ejb.TimerService;

/* GFv3: before using a timed bean make sure the ejb timer service is correctly configured with a datasource and the timer table is created
 * cd <glassfishv3>/glassfish/domains/domain1/lib/databases/ejbtimer 
 * /usr/lib/jvm/java-6-sun/db/bin/ij
 * connect 'jdbc:derby:.';
 * paste content from <glassfishv3>/glassfish/lib/install/databases/ejbtimer_derby.sql 
 * and content from <glassfishv3>/glassfish/lib/install/databases/upgrade/ejbtimer_upgrade_derby.sql (need the applicationID column)
 * after this make sure that all the files are owned by the user your GFv3 instance is running as
 * */ 

@Stateless
public class TimedEjb /*implements TimedObject*/ {

	public static class TimerInfo implements Serializable {
		static final long serialVersionUID = 1L;

		private long start = System.currentTimeMillis();

		public long getStart() {
			return start;
		}

	}

	private int count; //storing shared data like this is not recommended !!!

	@Resource
	private SessionContext sessionCtx;
	
	public void startTimer() {
		
		TimerService timerService = sessionCtx.getTimerService();
		
		TimerInfo info = new TimerInfo(); //the info object is not necessary - but can be used to store data with the timer

		//Timer timer = timerService.createTimer( (5 * 1000), info); //singleshot timer
		timerService.createTimer(10*1000, 5000, info ); //repeating timer
		
		// otherwise use schedule expression to create more complex schedules
		// in this case fire once every minute when the seconds is == 10
		//ScheduleExpression se = new ScheduleExpression().second(10).minute("*").hour("*");		
		//System.out.println(se.toString());
		//timerService.createCalendarTimer( se );

		count = 0;
		
	}
	
	//@Override if we used TimedObject interface
	//public void ejbTimeout(Timer timer) {

	//@Timeout
	public void myEjbTimeout(Timer timer) {

		TimerInfo info = (TimerInfo) timer.getInfo();
		
		//any updates to the info object is not pushed back to the timer services
		
		System.out.print("timeout .... " + count + " / " + info.getStart() );
		count++;
		
		if (count >= 10) {
			timer.cancel();
		}
	}

}