hibernate-devel

[Hibernate] Re: mvc & lazy loading

[Gavin K. <ga...@ap...>]

I wasn't following this thread very closely but I did sort of manage to pick
up on the main ideas. Does someone want to write some kind of little
informal summary of this discussion so I can add it to the documentation?

TIA

Gavin

[Hibernate-devel] Re: mvc & lazy loading

[Colin E. <ce...@mo...>]

Hi Brad,

I haven't tried this yet, but if I wanted to use lazy loading with Struts, I
would probably override ActionServlet and do something like this, and have
my DAO layer pull the session from the request context as needed:

----
/**
 * Hibernate Action Servlet
 */
public class HibernateActionServlet
        extends ActionServlet
{
    public void service(HttpServletRequest request, 
                        HttpServletResponse response)
    {
        Session session = null;
        try
        {
            session = factory.openSession();
            request.setAttribute("session", session);
            super.service(request, response);
        }
        finally
        {
           if(session != null) session.close();
        }
    }
}
----

Do other frameworks allow the controller servlet to be overridden?  This
probably is a fairly straightforward way to get lazy loading working.

-Colin

--
Colin Evans
Mobilesys 
www.mobilesys.com

[Hibernate-devel] Re: mvc & lazy loading

[Brad C. <bra...@wo...>]

originally i wondered whether this would work as the struts action servlet
does a RequestDispatcher.forward to pass control to the resource specified
by the ActionForward resulting from an Action.  however, i did a quick
little test, and i think your solution would work. ideally though, u would
only want a session created if the processing of the request used hibernate.

brad

----- Original Message -----
From: "Colin Evans" <ce...@mo...>
To: <hib...@li...>; <bra...@wo...>
Sent: Wednesday, August 28, 2002 6:59 AM
Subject: Re: mvc & lazy loading


> Hi Brad,
>
> I haven't tried this yet, but if I wanted to use lazy loading with Struts,
I
> would probably override ActionServlet and do something like this, and have
> my DAO layer pull the session from the request context as needed:
>
> ----
> /**
>  * Hibernate Action Servlet
>  */
> public class HibernateActionServlet
>         extends ActionServlet
> {
>     public void service(HttpServletRequest request,
>                         HttpServletResponse response)
>     {
>         Session session = null;
>         try
>         {
>             session = factory.openSession();
>             request.setAttribute("session", session);
>             super.service(request, response);
>         }
>         finally
>         {
>            if(session != null) session.close();
>         }
>     }
> }
> ----
>
> Do other frameworks allow the controller servlet to be overridden?  This
> probably is a fairly straightforward way to get lazy loading working.
>
> -Colin
>
> --
> Colin Evans
> Mobilesys
> www.mobilesys.com
>