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Posted to jetspeed-dev@portals.apache.org by Todd Kuebler <tk...@cisco.com> on 2003/02/26 23:18:28 UTC
Generic MVC Portlet Proposal
Hi folks,
I've noticed that one of the barriers to entry for portlet development is
learning all the different portlets including their inconsistencies in
handling events, etc. I have a proposal that might help that and wanted
your input. IMHO it would be extremely useful to have a base portlet that
would implement the MVC paradigm in a portlet context and de couple the
action handling and context idea from the specific templating language.
I've got a working prototype including a hello world example that uses the
same portlet and action for JSP and Velocity templates. I have included
the UML diagrams for your perusal. The package names, ect would obviously
be different.
Summary:
1) A base portlet that includes common action handling and context support
for all MVC type portlets such as JSP,Velocity,etc.
2) It should encapsulate/implement the basic MVC idea and provide action
event handling similar to the current velocity portlet.
3) Support for different View technology will be through a
ViewProcessorFactory that returns a ViewProcessor (JSPViewProcessor,etc)
- consumes the context
- init during portlet init cycle with the portlet object
- evoked after action handling
- view type, etc is determined by portlet registry entry
- the mapping of the type to class/module will happen via a ViewFactory
properties file
- returns the same type as the getContent() method of the Portlet
4) Developers will typically only write actions and templates
(JSP,velocity,XSLT,etc).
5) There will be a common context object for all templating types containing *
- rundata object reference
- portlet object reference
- js_peid string
- portlet config object reference
6) The initial implementation should provide support for JSP, Velocity,
RSS, HTML, and XSLT.
7) Future versions should include support for WebServices, etc
8) It will extend the jetspeed AbstractInstancePortlet
* note on #4: The XSLT ViewProcessor will be a little different/difficult
due to XSLT's runtime-static-variable nature (ie, you can't do things like
use variable substitution from the data source to do XPath pattern
matching) and lack of context idea. Maybe the context objects listed will
be added to the xml input as xml (limited) or the xalan-java extensions
will be used to allow them to be accessed within the style sheet via custom
tags. Another option would be to support template chaining and
pre-processing (parse the data to create a style sheet to be used on the
data). Another option would be to use some other templating technology to
create the style sheets dynamically (jsp templates to create the xsl
templates). Ideas here are definately welcome.
%regards -tk
Re: Updated MVC Portlet Proposal - website
Posted by Werner Ramaekers <we...@shiftat.com>.
looks great and i'm sure i can benefit from it, can not speak for others
though,
please open a case in bugzilla so that we can have a look at the code
(and also attach the contents of the page)
thanks
Werner
Todd Kuebler wrote:
> Got this pretty well done and working for my project here at work and
> moving on to something else, but wanted to double check if there was
> any interest in it before I took the website down. If there is
> positive interest I'll be happy to open a bugzilla case and attach the
> code, otherwise no sweat and saves us all a lot of work. :)
>
>
> -tk
>
>
> At 02:37 PM 2/28/2003 -0800, Todd Kuebler wrote:
>
>> You can see the modified proposal, integrated UML diagram and
>> javadocs at:
>>
>> http://www.kuebler.org/MVCPortlet/MVCPortlet.html
>>
>>
>> This is my home cable connection, so go gentle on it. ;)
>>
>>
>> %regards -tk
>>
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>> To unsubscribe, e-mail: jetspeed-dev-unsubscribe@jakarta.apache.org
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>>
>
>
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--
----------------------------------------------------------------------
ir. Werner Ramaekers
Enterprise Java Solutions Architect - Shift@
BeJUG steering committee member
JBoss Certified Services Partner
Read my Blog at http://www.werner.be
"May the source be with you."
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Re: Updated MVC Portlet Proposal - website
Posted by Todd Kuebler <tk...@cisco.com>.
Got this pretty well done and working for my project here at work and
moving on to something else, but wanted to double check if there was any
interest in it before I took the website down. If there is positive
interest I'll be happy to open a bugzilla case and attach the code,
otherwise no sweat and saves us all a lot of work. :)
-tk
At 02:37 PM 2/28/2003 -0800, Todd Kuebler wrote:
>You can see the modified proposal, integrated UML diagram and javadocs at:
>
> http://www.kuebler.org/MVCPortlet/MVCPortlet.html
>
>
>This is my home cable connection, so go gentle on it. ;)
>
>
>%regards -tk
>
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>To unsubscribe, e-mail: jetspeed-dev-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: jetspeed-dev-help@jakarta.apache.org
>
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Updated MVC Portlet Proposal - website
Posted by Todd Kuebler <tk...@cisco.com>.
You can see the modified proposal, integrated UML diagram and javadocs at:
http://www.kuebler.org/MVCPortlet/MVCPortlet.html
This is my home cable connection, so go gentle on it. ;)
%regards -tk
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Re: Generic MVC Portlet Proposal
Posted by Todd Kuebler <tk...@cisco.com>.
I'm resending the attachments, look like they didn't take the first time.
-tk