Hello,
Actually the problem is mainly on the taglib WNG. This is a shortcut
of our analysis:
1. WURFL Database
On one side there is WURFL, which is at the beginning an XML file
that is like a database because it contains a huge list of mobile
references with them capabilities (screen size, supported languages,
CSS, ...). This is useful to adapt the things to display and to
adapt the WML/HTML/XHTML... code to the mobile.
Over this file, there is a Java API (there are probably some other
languages) to read and to access the data. This can be used in
portlets, and particularly to check if it is a mobile or a desktop
browser because the database exists and is used by many applications
in the world.
Note that there are a lot of differences between each mobile in the
code supported even for XHTML mobile, you would be surprised. This
is why they develop a taglib to render code depending on the handset
and to avoid developing a JSP each and to add many conditions
depending on the handset.
2. WNG Taglib
On the second side there is the taglib WNG that is used to generate
appropriate code depending on the mobile. The developper has to use
tags of the taglib and does not need to think about which mobile.
The taglib manages the doctype, WML or XHTML, tags like table...
this taglib is the main problem:
- The taglib requires to use a Servlet Filter. This filter is not
compatible with portlet context so it would be required to develop
it.
- The taglib does not interpret parameters from JSF and most of the
portlets of our project are in JSF. So it would be required to adapt
the taglib to interpret the code with the risk to have to maintain
another version for a small community.
The taglib can be used easily in a regular Servlet/JSP environment
like Struts, Spring MVC... But for us it seems too complicate and
not maintainable to use it in a portal and even more using JSF.
I hope my e-mail is answering correctly to your question.
Regards,
Fred
Le 27/11/2010 01:23, Steve Swinsburg a écrit :
Hi Fred,
We are going to study
another way to display views on mobile than WURFL/WNG
because there are too many problem with this library
Could you expand a little on what issues you've found with
WURFL?
cheers,
Steve
On 27/11/2010, at 3:58 AM, Frédéric Ravetier wrote:
Hello all,
Thanks Xavier for your answer.
I'd like to adjust something that I said because I wrote my
answer too quickly :). The project managers of "ESUP Mobile"
are Xavier Petard and Francis Forbeau. I am the project
manager of a project for Paris Universities where we are
going to develop portlets for web and mobiles.
We are going to study another way to display views on mobile
than WURFL/WNG because there are too many problem with this
library. I will contact Xavier to share our experiences. I
will let you know about our progress.
Best regards,
Fred
Le 23/11/2010 17:49, Xavier Pétard a écrit :
Hi all,
our wiki pages about ESUP Mobile are in French, and before
I have enough time to explain precisely what we have done
or want to do, let me sketch it. We want to :
- provide help for our community on mobile-ready
uportal packages (hence our emails about lost sessions
in 3.2.4) ;
- provide a list of tested mobile portlets, whether
coming from jasig or done locally ;
- provide a framework to ease portlets development. We
are currently rewriting our esup-commons framework, to
be less tied to specific rendering methods : some
developers here use JSF (Trinidad for mobile
compliance, http://www.esup-portail.org/display/PROJCOMMONS/Esup-commons-jsf-trinidad),
some others SpringMVC (http://www.esup-portail.org/display/PROJCANSTOCK/Esup+Portlet+Stockage).
The last version is not anymore, like Frederic
Ravetier mentioned, tied to JSF. Anyway, all the
improvements made on the JSF part will certainly be
included ;-)
We know for sure we will have to write different views
between desktop and mobile, but one of the main questions
now is device detection, which has to be consistent
between portal and portlets, user being able to switch
between views.
Thanks to Frederic Ravetier, he was quicker than me
talking about ESUP Mobile. Anyware-Services is working
with us on the project, with the Paris Universities (UNR
Paris Ile de France).
Xavier Pétard
ESUP Portail
Le 22/11/10 19:12, Jen Bourey a écrit :
Hi Frederic,
It's great to hear from you, and I'm looking
forward to Jasig and Esup Portail collaborating on
mobile development. I've been involved in both the
mobile theme development for uPortal, as well as some
of the mobile portlet development. I'm traveling for
the holidays today, but I'll try to compose a summary
of what I know of the current state of mobile support
in uPortal trunk, as well as some of the changes we've
talked about making.
- Jen
On Nov 22, 2010, at 7:59 AM, Frédéric Ravetier
wrote:
Hello,
I am the project manager for the "ESUP Mobile
Project", working at Anyware-Services.
We started the development last week. Our first
portlet is a portlet to display messages (email
from an IMAP server that is under CAS).
Note that most of the ESUP portlet are using JSF
(which is a real difficulty to use the taglib WNG
from Wurfl with JSF). Also the goal is to have a
multi-channel portlet (available to display data
on mobile and desktop).
Our strategy is:
1- to develop a web portlet with a default and
simple skin (based on JSF)
2- build a filter (tomcat filter) based on WURFL
to detect if the user is using a mobile or a
desktop browser
3- make a mechanism to choose the JSP depending of
the detection (mobile to use WNG taglib - from
WURFL - or desktop to use classic JSF taglib)
4- modify the WNG taglib to work in an JSF
environment.
The last step may failed or may be too hard or too
complicate to maintain. In this case we will
reduce our constraints and we will use another
taglib to render data to mobile. We already think
about Trinidad. If you have suggestion I am open
to them. We'd like to avoid framework or library
that are only webkit compatible, because we'd like
to support many mobile browsers and not only
iphone and smartphone. It is a wish that can be
reduce depending on the complexity and the
maintainability.
Why WURFL, because it is THE taglib known by most
of the mobile developers that want a real
compatibility with most of the mobiles.
We are currently at step 2. We made the step 1
with some small doubt on step 1 because of the CAS
environment, we do not have an IMAP that support
CAS here.
Do you have suggestions?
Do you have others informations?
Do not hesitate to contact me in order to have
more information or to share some knowledge.
Then we will have some others portlet to enhance
or to develop (Calendar, Directory based on LDAP,
news, ...)
Let me know if you prefer another discussion
channel than this one.
Sincerely,
Frédéric Ravetier
Project Manager
Anyware-Services ( www.anyware-services.com)
frederic.ravet...@anyware-services.com
Phone: +33 5 62 19 19 03
Ametys: The CMS Java Open Source www.ametys.org
Le 22/11/2010 16:03, Jonathan Markow a écrit :
I
recently had a conversation with Alain Mayeur,
director of ESUP Portail, the nation-wide
consortium of French universities that have
developed a "Digital Work Space" based on
uPortal, CAS, and a host of other open source
applications that they have developed or
integrated. Alain told me about two projects
currently underway that are of interest to
Jasig.
The first one is the ESUP Mobile Project.
With several participating universities, this
project is working to coordinate the
development of mobile services supported by
the mobile framework in uPortal 3.2. The wiki
page for the project (in French) is located at
http://www.esup-portail.org/display/PROJESUPMOBILE/Projet+ESUP+Mobile.
A second project, also the result of a
collaboration among several organizations, is
designed to enhance the content management
capabilities of uPortal.
Alain will ask the project leads to send us
more information about these initiatives. I
am hoping there might be some areas in which
Jasig developers would be able to contribute.
-Jonathan
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