Yes, we’ve found a solution (we work
together with Avi) and I’d like to share it with you.
Actually there are two challenges when composing
consumer-side URLs for producer-side resources:
In
some cases the resource name must be preserved in the consumer-side URL (like
.jar for applets)
Nested
resources – if a css contains URLs, they must be rewritten as well.
The solution includes the following aspects:
The
Consumer modifies the URLs so that they will end up with the resource names.
The
Portlets use a standard API to output resource URLs. In WSRP scenario
these calls are intercepted by the Producer, which does the necessary conversions
(for example, URL writing using templates).
If
the URL references a resource containing other URLs (like css or js), the
producer replaces the resource URL with a URL pointing to a special
producer-side servlet. This servlet acts as a filter when downloading the
resource, and rewrites all the URLs it contains.
For illustration imagine a Portlet called ExamplePortlet which was deployed with
image resource /images/r1.gif. Its
consumer-side URL will look like this:
http://consumer.com/portal/consumer/resources/r1.gif?producerUrl=http://producer.com/portlets/ExamplePortlet/images/r1.gif
If the Portlet has a style sheet resource /css/r2.css, its URL will look like this:
http://consumer.com/portal/consumer/resources/r2.css?producerUrl=http://producer.com/producer/resources/r2.css?resourceUrl=http://producer.com/portlets/ExamplePortlet/css/r2.css
Now if r2.css contains a reference to
r1.gif, then the producer-side servlet (producer/resources) will invoke the
Producer URL writing logic for this URL. So eventually the image URL returned
to the client within the style sheet will exactly as in the first example.
Regards,
Artem
From: Rich Thompson
[mailto:]
Sent: Tuesday, March 22, 2005 9:58
PM
To:
Subject: Re: [wsrp-interfaces]
Applet resources through WSRP
I have been asked this question now by several people
... has anyone tried referencing an applet in markup from a WSRP portlet? If
so, any guidelines that should be shared with portlet developers?
Rich
Subbu Allamaraju
<>
01/26/05 08:07 AM
To
cc
Subject
Re: [wsrp-interfaces] Apptel resources
through WSRP
Is
the Producer returning the Content-Type header? I've not tried applet
downloading, but if Content-Type does not work, I
would try the
Content-Disposition header, e.g. with a
"inline; filename=foo.jar"
value. In any case, the Consumer has to proxy
these headers to the browser.
Regards,
Subbu
Klein, Avi wrote:
> Hi,
>
>
>
> I wonder if someone has dealt with fetching
of applet as resource.
>
>
>
> Whenever rewriting the URL of the applet, the
browser fails to fetch it
> since it expects the URL to end with *.jar
and not with the consumer URL
> (result of the rewriting).
>
>
>
>
>
> Thanks,
>
>
>
> Avi.
>
