thoerup/traininfoservice/StatisticsListener.java

package dk.thoerup.traininfoservice;

import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Logger;

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


public class StatisticsListener implements ServletContextListener {
        
        Logger log = Logger.getLogger(StatisticsListener.class.getName());

        Timer timer = null;
        int update_interval;

    public void contextInitialized(ServletContextEvent sce) {
        
        update_interval = getUpdateInterval( sce.getServletContext() );
        
        log.info("StatisticsListener::contextInit called update_interval=" + update_interval);
        
        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) {
        log.info("StatisticsListener::contextDestroyed");
        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	import java.util.logging.Logger;
6
7	import javax.servlet.ServletContext;
8	import javax.servlet.ServletContextEvent;
9	import javax.servlet.ServletContextListener;
10
11
12	public class StatisticsListener implements ServletContextListener {
13
14	Logger log = Logger.getLogger(StatisticsListener.class.getName());
15
16	Timer timer = null;
17	int update_interval;
18
19	public void contextInitialized(ServletContextEvent sce) {
20
21	update_interval = getUpdateInterval( sce.getServletContext() );
22
23	log.info("StatisticsListener::contextInit called update_interval=" + update_interval);
24
25	if ( update_interval > 0 ) {
26	timer = new Timer();
27
28	TimerTask statsUpdate = new TimerTask() {
29	@Override
30	public void run() {
31	Statistics.getInstance().saveStats();
32	}
33	};
34
35	timer.schedule(statsUpdate, 0, update_interval);
36	}
37	}
38
39
40	public void contextDestroyed(ServletContextEvent sce) {
41	log.info("StatisticsListener::contextDestroyed");
42	if ( update_interval > 0 ) {
43	timer.cancel();
44	Statistics.getInstance().saveStats();
45	}
46	}
47
48	private int getUpdateInterval(ServletContext cntx) {
49	int interval = 0;
50	try {
51	String intervalStr = cntx.getInitParameter("stats_interval");
52	interval = Integer.parseInt(intervalStr);
53	} catch (Exception e) {}
54
55	return interval;
56	}
57	}