Hello Silvio,
I migrated the page from Perl to Java. (Still need to remove the old perl page.)
Yes, it's more work, but migrating perl pages to java is our long-term effort.
We do not want to introduce any extra parameters, but rather migrate.
Regards,
--
Tomas Lestach
Red Hat Satellite Engineering, Red Hat
----- Original Message -----
> From: "Silvio Moioli" <smoi...@suse.de>
> To: spacewalk-devel@redhat.com
> Sent: Thursday, May 16, 2013 2:50:52 PM
> Subject: [Spacewalk-devel] Sharing state between Java and Perl stacks
>
> Hello everyone,
> I am trying to fix a minor bug in the "Manage Software Channels"
> section, and I would like to know your opinion about the possible
> solutions.
>
> Steps to reproduce the bug:
> - click on the "Channels" tab,
> - click on "Manage Software Channels",
> - click on any one of the available channels (the "Details" sub-tab
> gets opened),
> - click on the "Managers" sub-tab,
> - click on "delete software channel"
>
> Expected output: the "Managers" sub-tab stays selected
> Actual output: the "Details" sub-tab gets selected
>
> Basically the navigation bar will "remember" whatever sub-tab you had
> opened before "Managers" and will select it after you click on
> "delete software channel". Note that this does not happen in any of
> the other sub-tabs ("Details", "Patches", "Packages" and
> "Repositories").
>
> As far as I understand that happens because NavTreeIndex tries to
> determine the current sub-tab in order to "select" it, and since
> none of the URLs match the current one it will pick the most
> recently used:
>
> // If we have a lastActive URL we
> // will add it to the end of the list of URLs to
> // use it as a last resort.
> if (lastActive != null) {
> …
> }
>
> This does not work for the "Managers" sub-tab because it is actually
> implemented in Perl, thus it has no visibility over Java session
> state variables and lastActive will remain untouched.
>
> So:
> - as far as I understand there is no standard mechanism to share
> session data between the Perl and Java stacks;
> - as far as I understand this is a general problem whenever Perl and
> Java pages need to share temporary state information; anyway I am
> not aware of other cases in which that is necessary;
> - the specific problem could be worked around by adding an extra
> query string parameter to the "delete software channel" link and
> having NavTreeIndex (or some other controller class) interpret it.
> Similar solutions could be implemented if analogous bugs are found;
> - the specific problem could also be resolved by porting the page
> form Perl to Java, even if it seems to be quite a lot of effort for
> this bug alone.
>
> What are your thoughts about this? Do you think that adding a
> parameter would be acceptable?
>
> Thanks in advance,
>
> Silvio
>
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