Spring MVC - do sth before anyone goes into webpage

Question

I need to create an application which loads the data into database during the night(f.i 4a.m). I found this tutorial: http://websystique.com/spring/spring-job-scheduling-with-scheduled-enablescheduling-annotations/

And this scheduling works great! However..., to somehow tell my application that it will start to use the scheduler I have to write:

 AbstractApplicationContext  context = new AnnotationConfigApplicationContext(ApplicationScheduler.class);

and... I have no idea where to put it. I cannot put it into my controller because then it will be set at that time when user enters the webpage and at the begining there will be no data. So I need this scheduler to be set up when I deploy my application on server. For example, I put my app on server at 2a.m and then it knows that at 4a.m it will download the data.

To sum up, I know how to set this scheduler to do what I want at the time I want. I just have no idea where I should set this abstract application context.

You don't have to write that nor do you want to write that especially not somewhere it is invoked repeatedly. Just make the bean you want to invoke/schedule part of the application context you already have. — M. Deinum, Jan 26 '15 at 09:00

score 1 · Answer 1 · answered Jan 26 '15 at 01:38

1

You can create f.e. some class annotated with @Service and put scheduled methods within.

@Service
public class SchedulerService  {

    @Scheduled(cron="0 4 * * * ?")
    public void loadDataInDB() {
        . . .
    }
}

answered Jan 26 '15 at 01:38

ancalled

174
6

score 0 · Accepted Answer · answered Jan 26 '15 at 11:22

Thanks for answers but I think I found the best one:

public class MyAppServletContextListener 
               implements ServletContextListener{

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        System.out.println("ServletContextListener destroyed");
    }


            //Run this before web application is started
        @Override
        public void contextInitialized(ServletContextEvent arg0) {
            System.out.println("ServletContextListener started");   
AbstractApplicationContext  context = new AnnotationConfigApplicationContext(ApplicationScheduler.class);
        }
    }

Spring MVC - do sth before anyone goes into webpage

2 Answers2