HTTP Session Listener

[soares]

Hi guys,

I'm need to inject an EntityManager in my HTTPSessionListener class, because I need
to update the database when some user has its session expired, So I'm using the
sessionDestroyed method, to handle the database data, and to conclude it, I need to inject
a EntityManager using @In annotation. I'm using Seam 2.2.0 with Tomcat 6. My code is bellow:

Thank you!

public class SessionListener implements HttpSessionListener
{

    @In
    private EntityManager entityManager;

    public void sessionCreated(HttpSessionEvent se)
    {
        System.out.println("CREATED: " + se.getSession().getId());
    }

    public void sessionDestroyed(HttpSessionEvent se)
    {
        HttpSession session = se.getSession();

        System.out.println("DESTROYED: " + session.getId());

        Integer processUserId = (Integer) session
                .getAttribute(UserAuthentication.LOGGED_PROCESS_USER_ID);

        if (entityManager != null && processUserId != null && processUserId > 0)
        {
            System.out.println("UPDATE DATABASE!!");
            ProcessUser processUser = entityManager
                    .find(ProcessUser.class, processUserId);
            processUser.setOnline(false);
            entityManager.merge(processUser);
        }

        String message = new StringBuffer("#### USER ID: " + processUserId).toString();
        System.out.println(message);
    }
}

[soares]

I forgot to say: the injected EntityManager is always null. I think it happens because the Seam session is already dead... But I'd like to find a good way to update the database on session expires. Thanks!

[kirpi4ik]

Hi,

You can create a Session scoped component and add the method annotated with @Destroy. In this method you can release your session-related objects(or whatever you need to do). This method will be invoked before your session is destroyed.

with best regards,

Dima

[soares]

Yeah, it should really works! thanks a lot Dima!