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) {
    	
    	TraininfoSettings settings = SettingsListener.loadSettings(sce.getServletContext());
    	
    	update_interval = settings.getStatsInterval();    	    	
    	
    	if (! sce.getServletContext().getRealPath("/").startsWith("/home/app/")  ) {
    		//if path not starts with /home/app then it is not running on a production server and we only collects stats on prod servers
    		log.info("This is not a prod. server, dont start Statistics saver");
    		return;
    	}
    	
    	
    	
    	if ( update_interval > 0 ) {
    		log.info("Statistics saver started with update_interval=" + update_interval);
	        timer =  new Timer();
	        
	        TimerTask statsUpdate = new TimerTask() {
				@Override
				public void run() {
					Statistics.getInstance().saveStats();
				}
	        };
	        
	        timer.schedule(statsUpdate, 0, update_interval);
    	} else {
    		log.info("Statistics saver disabled (update_interval == 0) ");
    	}
    }


    public void contextDestroyed(ServletContextEvent sce) {
    	log.info("StatisticsListener::contextDestroyed");
    	if ( timer != null ) {
    		timer.cancel();
    		Statistics.getInstance().saveStats();
    	}
    }

}