Hello Joerg,
I not sure, you can read the chapter over Resource Serving. There you
can create a link which points back to itself. You can find the
Specification under the folliwing link:
http://ipc658.inf-swt.uni-jena.de/spec/
Best regards
Torsten
Joerg Heinicke schrieb:
Glenn R. Golden <ggolden <at> umich.edu> writes:
A portlet can only generate "markup fragment". The output from a
portlet is aggregated by the portal engine into a complete "markup"
document. Markup is usually (but not limited to) HTML.
Portlets can not generate images or other binary content, as that does
not fit in the model of fragments and markups and aggregated documents.
Sorry for resurrecting such an old thread [1], but it's the best one I found on
this topic.
Is everything of the above still true? Probably yes for JSR 168, but what about
the JSR 286?
Stefan Hepper mentioned later in the thread:
However, for the problem you mentioned there is currently no solution
besides the servlet one that Glenn mentioned, as there is no ability for
the portlet to create a link pointing back to it that does not trigger
the rendering of all portlets on the page.
Shouldn't it be easy to let a request that returns non-markup "pass
through" the portal and prevent it to "trigger the rendering of all portlets on
the page"? The detection of returning markup or non-markup can be either
auto-magically or by configuration.
You can continue to use a servlet to generate your image. You would
use a portlet to generate the html markup fragment that places the
image into the document at a particular point.
This is quite sub-optimal. A portlet should encapsulate some functionality. I
have the need to provide data as table and as chart. By enforcing the chart
generation to a servlet I first have to spread the functionality into 2
components and second copy & paste at least the code to implement the same
controller logic while it would theoretically only be necessary to implement
different views.
Is using a servlet still the recommended and necessary way?
Regards
Jörg
[1] http://thread.gmane.org/gmane.comp.jakarta.pluto.user/467
