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;
import javax.servlet.annotation.WebListener;

@WebListener
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	import javax.servlet.annotation.WebListener;
11
12	@WebListener
13	public class StatisticsListener implements ServletContextListener {
14
15	Logger log = Logger.getLogger(StatisticsListener.class.getName());
16
17	Timer timer = null;
18	int update_interval;
19
20	public void contextInitialized(ServletContextEvent sce) {
21
22	update_interval = getUpdateInterval( sce.getServletContext() );
23
24	log.info("StatisticsListener::contextInit called update_interval=" + update_interval);
25
26	if ( update_interval > 0 ) {
27	timer = new Timer();
28
29	TimerTask statsUpdate = new TimerTask() {
30	@Override
31	public void run() {
32	Statistics.getInstance().saveStats();
33	}
34	};
35
36	timer.schedule(statsUpdate, 0, update_interval);
37	}
38	}
39
40
41	public void contextDestroyed(ServletContextEvent sce) {
42	log.info("StatisticsListener::contextDestroyed");
43	if ( update_interval > 0 ) {
44	timer.cancel();
45	Statistics.getInstance().saveStats();
46	}
47	}
48
49	private int getUpdateInterval(ServletContext cntx) {
50	int interval = 0;
51	try {
52	String intervalStr = cntx.getInitParameter("stats_interval");
53	interval = Integer.parseInt(intervalStr);
54	} catch (Exception e) {}
55
56	return interval;
57	}
58	}