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	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	torben	959	import javax.servlet.annotation.WebListener;
11	torben	811
12	torben	959	@WebListener
13	torben	811	public class StatisticsListener implements ServletContextListener {
14	torben	816
15			Logger log = Logger.getLogger(StatisticsListener.class.getName());
16	torben	811
17			Timer timer = null;
18			int update_interval;
19
20			public void contextInitialized(ServletContextEvent sce) {
21
22			update_interval = getUpdateInterval( sce.getServletContext() );
23	torben	816
24			log.info("StatisticsListener::contextInit called update_interval=" + update_interval);
25
26	torben	811	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	torben	816	log.info("StatisticsListener::contextDestroyed");
43	torben	811	if ( update_interval > 0 ) {
44			timer.cancel();
45	torben	814	Statistics.getInstance().saveStats();
46	torben	811	}
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			}