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	torben	811	package dk.thoerup.traininfoservice;
2
3			import java.util.Timer;
4			import java.util.TimerTask;
5	torben	816	import java.util.logging.Logger;
6	torben	811
7			import javax.servlet.ServletContext;
8			import javax.servlet.ServletContextEvent;
9			import javax.servlet.ServletContextListener;
10
11
12			public class StatisticsListener implements ServletContextListener {
13	torben	816
14			Logger log = Logger.getLogger(StatisticsListener.class.getName());
15	torben	811
16			Timer timer = null;
17			int update_interval;
18
19			public void contextInitialized(ServletContextEvent sce) {
20
21			update_interval = getUpdateInterval( sce.getServletContext() );
22	torben	816
23			log.info("StatisticsListener::contextInit called update_interval=" + update_interval);
24
25	torben	811	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	torben	816	log.info("StatisticsListener::contextDestroyed");
42	torben	811	if ( update_interval > 0 ) {
43			timer.cancel();
44	torben	814	Statistics.getInstance().saveStats();
45	torben	811	}
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			}