thoerup/traininfoservice/StatisticsListener.java

package dk.thoerup.traininfoservice;

import java.util.Timer;
import java.util.TimerTask;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;


public class StatisticsListener implements ServletContextListener {

        Timer timer = null;
        int update_interval;

    public void contextInitialized(ServletContextEvent sce) {
        
        update_interval = getUpdateInterval( sce.getServletContext() );
        if ( update_interval > 0 ) {
                timer =  new Timer();
                
                TimerTask statsUpdate = new TimerTask() {
                                @Override
                                public void run() {
                                        Statistics.getInstance().saveStats();
                                }
                };
                
                timer.schedule(statsUpdate, 0, update_interval);
        }
    }


    public void contextDestroyed(ServletContextEvent sce) {
        if ( update_interval > 0 ) {
                timer.cancel();
                Statistics.getInstance().saveStats();
        }
    }

    private int getUpdateInterval(ServletContext cntx) {
        int interval = 0;
        try {
                String intervalStr = cntx.getInitParameter("stats_interval");
                interval = Integer.parseInt(intervalStr);
        } catch (Exception e) {}
        
        return interval;
    }
}
1	package dk.thoerup.traininfoservice;
2
3	import java.util.Timer;
4	import java.util.TimerTask;
5
6	import javax.servlet.ServletContext;
7	import javax.servlet.ServletContextEvent;
8	import javax.servlet.ServletContextListener;
9
10
11	public class StatisticsListener implements ServletContextListener {
12
13	Timer timer = null;
14	int update_interval;
15
16	public void contextInitialized(ServletContextEvent sce) {
17
18	update_interval = getUpdateInterval( sce.getServletContext() );
19	if ( update_interval > 0 ) {
20	timer = new Timer();
21
22	TimerTask statsUpdate = new TimerTask() {
23	@Override
24	public void run() {
25	Statistics.getInstance().saveStats();
26	}
27	};
28
29	timer.schedule(statsUpdate, 0, update_interval);
30	}
31	}
32
33
34	public void contextDestroyed(ServletContextEvent sce) {
35	if ( update_interval > 0 ) {
36	timer.cancel();
37	Statistics.getInstance().saveStats();
38	}
39	}
40
41	private int getUpdateInterval(ServletContext cntx) {
42	int interval = 0;
43	try {
44	String intervalStr = cntx.getInitParameter("stats_interval");
45	interval = Integer.parseInt(intervalStr);
46	} catch (Exception e) {}
47
48	return interval;
49	}
50	}