Hi Glen,
--- On Fri, 7/31/09, Glen Mazza <glen.ma...@gmail.com> wrote:
> From: Glen Mazza <glen.ma...@gmail.com>
> Subject: Reliance on session.setAttribute() for error messages?
> To: jetspeed-user@portals.apache.org
> Date: Friday, July 31, 2009, 5:34 AM
>
> Hello,
>
> I just wrote a blog entry on making SOAP client calls from
> a Jetspeed-hosted
> portlet[1] but am not sure about one point in my code--in
> Step #4, I'm
> relying on the following statement to send error messages
> back to the view
> (the JSP page) for display:
>
> session.setAttribute("ErrorString", "Nothing found for ZIP
> Code: " +
> zipCode, PortletSession.APPLICATION_SCOPE);
>
> Is that thread-safe and reliable for multiple users?
I think it's not thread-safe but reliable for multiple users. A portlet session
is based on the underlying servlet session which is unique per "user". So, it's
reliable because other user cannot see the session attributes. However, if a
user makes multiple requests and the requests trigger multiple threads, then
multiple threads for the user can see the same session attribute.
Anyway, I think it's reliable to store error information into session in your
case.
By the way, according to portlet api javadoc for PortletSession interface, it
says:
"All objects stored in the session using the APPLICATION_SCOPE must be
available to all the portlets, servlets and JSPs that belongs to the same
portlet application and that handles a request identified as being a part of
the same session. Objects stored in the session using the PORTLET_SCOPE must be
available to the portlet during requests for the same portlet window that the
objects where stored from. Attributes stored in the PORTLET_SCOPE are not
protected from other web components of the portlet application. They are just
conveniently namespaced."
Therefore, I think you can use PORTLET_SCOPE instead of APPLICATION_SCOPE to
avoid the session attribute conflicts among portlet windows.
Regards,
Woonsan
>
> Thanks,
> Glen
>
> [1] http://www.jroller.com/gmazza/date/20090730
>
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>
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