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Posted to dev@cocoon.apache.org by Vadim Gritsenko <va...@reverycodes.com> on 2004/11/23 14:54:57 UTC
Taglib Block, and Re: Planning Cocoon's future
Reinhard Poetz wrote:
> Daniel Fagerstrom wrote:
>
>> Reinhard Poetz wrote:
>>
>>> After releasing Cocoon 2.1.6 it's time to plan our future. A few
>>> month ago we
>>> updated our roadmap in SVN. According to this we agreed that 2.2 is a
>>> consolidated version of 2.1.
>>>
>>> So what are the changes and what's their current status?
>>> --------------------------------------------------------
>>
>> <snip/>
>>
>>> - deprecate XSP
>>> to be done (needs an alternative)
ATM, I'm -1 on deprecating XSP. There is just not enough information yet to make
such a decision - we have some wishes but nothing concrete yet.
<snip/>
>> For the taglib I have not been able to find any documentation of how
>> it works and the design behind it (any pointers?), and have not found
>> time to read the code. Vadim used it in the faces block so it is
>> probably reasonably good. Vadim, can you (and other users of taglib),
>> tell about your experience from using it?
Taglib block is an attempt to mimick JSP taglib classes, with account of
differences such as System.out vs SAX XMLConsumer. It provides interfaces:
* Tag
* BodyTag
* IterationTag
And base classes:
* TagSupport
It also provides some Cocoon specific interfaces / classes such as:
* TransformerTag, TransformerTagSupport
* XMLConsumerTag, XMLConsumerTagSupport
* XMLProducerTag, XMLProducerTagSupport
It also has expression language built-in which is based on jxpath, and that's
where I'm disagreeing with initial author. I'm thinking it should be more
in-line with JSP spec and simpy use JSP expression language as-is. This would
allow full JSTL taglib implementation in Cocoon, so that you can use 3rd party
JSP editors to create JSP pages and then simply run them in Cocoon (almost)
unmodified as long as JSP page is well-formed XML.
Additionally, JSP EL can be extended with Cocoon OM objects and easy access to
variables passed from the flow. JXPath also could be plugged in, but only as an
alternative, instead of main implementation (which is currently a bit broken
anyway).
About faces block; usage of taglib block there provided for an easy "migration
path" of JSP JSF taglibs into Cocoon Faces taglibs, and final result is such
that I can use very similar JSP JSF pages and Cocoon Faces pages - the only
difference is addition of namespace declarations and removal of JSP taglib
instructions. Both use same expression language, so your 3rd party JSF editor
can resolve and validate expressions (and may be even code completion).
>> IMHO, if the taglib is good enough, the best approach for JXTG 2.0
>> would be to refactor the JXTG tags to taglib tags, factor out the
>> object model and make the expression language plugable.
The problem I'm seeing with this is that JXTG should be implemented as
*generator*, with template pre-parsing, pre-processing, template caching, and
other features, whereas Taglib is *transformer* and can not provide these options.
Currently I'm seeing taglib as a step-up stone from JSP into the world of Cocoon
- once JSP EL and JSTL support is added to it, that is.
PS Folks who currenly stuck with JSP are welcome to volunteer
Vadim
Re: Taglib Block, and Re: Planning Cocoon's future
Posted by Stefano Mazzocchi <st...@apache.org>.
Bertrand Delacretaz wrote:
> Le 23 nov. 04, à 14:54, Vadim Gritsenko a écrit :
>
>> ...ATM, I'm -1 on deprecating XSP. There is just not enough
>> information yet to make such a decision - we have some wishes but
>> nothing concrete yet...
>
>
> I'm +1 on your -1 ;-)
>
> XSP is used in a lot of existing apps, it works and it doesn't seem to
> be a heavy burden to carry.
> I don't think there's a real urgency to deprecate XSP, except the desire
> to move forward of course. But not developing it any further is clear
> signal already.
I'm working on a reporting web application for gump based on cocoon and
I tried *hard* not to use XSP but I couldn't since ESQL is the
best/most-efficient tool for the job when reporting is concerned.
We already made it a block, I don't think we need to deprecate it until
we have something that is equivalently powerful and yet solves the
issues with it (being too powerful ;-)
--
Stefano.
Re: Taglib Block, and Re: Planning Cocoon's future
Posted by Bertrand Delacretaz <bd...@apache.org>.
Le 23 nov. 04, à 14:54, Vadim Gritsenko a écrit :
> ...ATM, I'm -1 on deprecating XSP. There is just not enough
> information yet to make such a decision - we have some wishes but
> nothing concrete yet...
I'm +1 on your -1 ;-)
XSP is used in a lot of existing apps, it works and it doesn't seem to
be a heavy burden to carry.
I don't think there's a real urgency to deprecate XSP, except the
desire to move forward of course. But not developing it any further is
clear signal already.
-Bertrand
Re: Taglib Block, and Re: Planning Cocoon's future
Posted by Daniel Fagerstrom <da...@nada.kth.se>.
Vadim Gritsenko wrote:
> Reinhard Poetz wrote:
>
>> Daniel Fagerstrom wrote:
>
<snip what="Info about taglib"/>
> About faces block; usage of taglib block there provided for an easy
> "migration path" of JSP JSF taglibs into Cocoon Faces taglibs, and
> final result is such that I can use very similar JSP JSF pages and
> Cocoon Faces pages - the only difference is addition of namespace
> declarations and removal of JSP taglib instructions. Both use same
> expression language, so your 3rd party JSF editor can resolve and
> validate expressions (and may be even code completion).
>
>>> IMHO, if the taglib is good enough, the best approach for JXTG 2.0
>>> would be to refactor the JXTG tags to taglib tags, factor out the
>>> object model and make the expression language plugable.
>>
>
> The problem I'm seeing with this is that JXTG should be implemented as
> *generator*, with template pre-parsing, pre-processing, template
> caching, and other features, whereas Taglib is *transformer* and can
> not provide these options.
>
> Currently I'm seeing taglib as a step-up stone from JSP into the world
> of Cocoon - once JSP EL and JSTL support is added to it, that is.
>
> PS Folks who currenly stuck with JSP are welcome to volunteer
>
> Vadim
Ok, thanks for the info. From what you say it seem better to let the
taglib focus on its close connection to JSP taglib. After having studied
the code in more detail I don't think it would be worthwhile to refactor
it to handle the pre-compilation step needed for JXTG.
/Daniel
Re: Taglib Block, and Re: Planning Cocoon's future
Posted by Torsten Curdt <tc...@apache.org>.
>> ATM, I'm -1 on deprecating XSP. There is just not enough information
>> yet to make such a decision - we have some wishes but nothing concrete
>> yet.
>
>
> I feel the same way.
>
> No deprecation before we have general concensus on the suggested
> template language to use.
...I would also like to see the a comparable functionality
of some logicsheets first. For me this e.g. means merging
ESQL and the SQLTransformer.
I think the signals are already set ...but -1 on the deprecation
cheers
--
Torsten
Re: Taglib Block, and Re: Planning Cocoon's future
Posted by Stefano Mazzocchi <st...@apache.org>.
Vadim Gritsenko wrote:
> Reinhard Poetz wrote:
>
>> Daniel Fagerstrom wrote:
>>
>>> Reinhard Poetz wrote:
>>>
>>>> After releasing Cocoon 2.1.6 it's time to plan our future. A few
>>>> month ago we
>>>> updated our roadmap in SVN. According to this we agreed that 2.2 is a
>>>> consolidated version of 2.1.
>>>>
>>>> So what are the changes and what's their current status?
>>>> --------------------------------------------------------
>>>
>>>
>>> <snip/>
>>>
>>>> - deprecate XSP
>>>> to be done (needs an alternative)
>
> ATM, I'm -1 on deprecating XSP. There is just not enough information yet
> to make such a decision - we have some wishes but nothing concrete yet.
I feel the same way.
No deprecation before we have general concensus on the suggested
template language to use.
--
Stefano.