Subversion Repositories SmartDukaan

/**

 * 

 */

package in.shop2020.creation.util;

import in.shop2020.util.BDBHotBackupTask;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.concurrent.Executors;

import java.util.concurrent.ScheduledExecutorService;

import java.util.concurrent.TimeUnit;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

/**

 * @author mandeep

 *

 */

public class BackgroundTaskExecutor implements ServletContextListener {

    private static Log log = LogFactory.getLog(BackgroundTaskExecutor.class);

    private ScheduledExecutorService scheduler;

    @Override

    public void contextInitialized(ServletContextEvent event) {

        log.info("Inside contextInitialized");

        scheduler = Executors.newSingleThreadScheduledExecutor();

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss");

        SimpleDateFormat sdfYYYYMMDD = new SimpleDateFormat("yyyyMMdd");

        long initialDelay = 0;

        long period = 12 * 60 * 60 * 1000; //12 hours in milliseconds

        try {

            Calendar calendar = Calendar.getInstance();

            calendar.add(Calendar.DATE, 1);

            initialDelay = sdf.parse(sdfYYYYMMDD.format(calendar.getTime()) + " 15:00:00").getTime() - new Date().getTime();

            initialDelay %= period;

        } catch (ParseException e) {

            log.error("Could not compute initial delay", e);

        }

        scheduler.scheduleAtFixedRate(new BDBHotBackupTask(), initialDelay, period, TimeUnit.MILLISECONDS);

    }

    @Override

    public void contextDestroyed(ServletContextEvent event) {

        log.info("Inside contextDestroyed");

        scheduler.shutdownNow();

    }

}