David Gagnon ha scritto:
Hi Antonio,
I suppose that you want to use some window-scoped attribute in your
JSP page, right?
In this case I think that you could "copy" you attribute from window
scope to page scope (probably with some custom tag library) and then
use it, without changing Struts codebase.
HTH
Antonio
Yes that would be a workaround indeed but somewhat cumbersome since I
use this scope everywhere. I do think struts should offer a way to
change TagUtils behavior.
With the : private final TagUtils instance; there is clearly no way
in :-( It should be at least: protected TagUtils instance Or offers
a way to specify the implementation to use.
In part I agree with you: the main motivation to use singleton pattern
instead of a class with all static methods is to let someone else extend it.
I did an webBase ERP and in this context the window scope make sense.
One session, 3 windows, 1 Request and 1 page scope. And I do want to
change the implementation because this way I can use all the Struts
taglib without a change!
You are correct, but what if you are going to use JSTL tags? Do you have
to change that codebase too?
The big problem with scoping is that the servlet specification support
only the 4 famous scopes (application, session, request, page). Other
frameworks are on the path of expanding the number of scopes (Tapestry,
Spring, JBoss Seam), though I don't know if they support window scope.
Even I am going to publish a library for managing scopes (I am only
waiting for review from Sourceforge team) independently from the
framework (it can be used even with bare servlets).
I think that scoping cannot be solved with a change like that, but there
should be some substantial change.
Maybe I need to open a BUG to propose the enhancement?
Is that make sense?
If you changed Struts code and it worked, then file a bug ticket for the
enhancement, I think that many other can benefit from this change.
Ciao
Antonio
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