ArenMg/src/main/java/fr/lirmm/aren/servlet/BackgroundJobManager.java

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package fr.lirmm.aren.servlet;

import fr.lirmm.aren.service.CommentService;
import fr.lirmm.aren.service.vm.VMSendNotificationService;

import java.util.Calendar;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import javax.inject.Inject;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

/**
 *
 * @author florent
 */
@WebListener
public class BackgroundJobManager implements ServletContextListener {

    @Inject
    private CommentService commentService;

    private ScheduledExecutorService scheduler;

    @Override
    public void contextInitialized(ServletContextEvent event) {
        Calendar c = Calendar.getInstance();
        c.add(Calendar.DAY_OF_MONTH, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        long untilMidnight = (c.getTimeInMillis() - System.currentTimeMillis());
        long millisInDay = 24 * 60 * 60 * 1000;

        this.scheduler = Executors.newSingleThreadScheduledExecutor();
        this.scheduler.scheduleAtFixedRate(() -> {
            this.commentService.updateAllTags();
        }, untilMidnight, millisInDay, TimeUnit.MILLISECONDS);

        VMSendNotificationService sendNotificationService=new VMSendNotificationService() ;
        sendNotificationService.start();
    }

    @Override
    public void contextDestroyed(ServletContextEvent event) {
        this.scheduler.shutdownNow();
    }
}