Here is a small part of an incoming article :
a.. Portlet filters : filters are on the list, in the suggestions chapter, for the
next version of the portlet specifications. We have implemented this feature
reproducing as well as possible the servlet filter's API. The interfaces used are very
similar to the servlet ones.
Figure 7. The Portlet Filters extension
The main difference is that filters are defined per portlet. To add a filter the
portlet developer must define it in the portlet.xml file.
<portlet>
<filter>
<filter-name>LoggerFilter</filter-name>
<filter-class>exo.services.portletcontainer.test.filter.LoggerFilter</filter-class>
<init-param>
<name>default-param</name>
<value>default-param-value</value>
</init-param>
</filter>
[...]
</portlet>
For example, it is good practise to use such filters to log access to portlets with
non intrusive code. The class would look like :
public class LoggerFilter implements PortletFilter{
public void init(PortletFilterConfig portletFilterConfig) throws PortletException {
if(!"default-param-value".equals(portletFilterConfig.getInitParameter("default-param")))
throw new PortletException();
}
public void doFilter(PortletRequest portletRequest,
PortletResponse portletResponse,
PortletFilterChain filterChain)
throws IOException, PortletException {
// do something before the portlet is reached
filterChain.doFilter(portletRequest, portletResponse) ;
// do something after the portlet is reached
}
public void destroy() {
}
}
The filter chain is created from the list of filters defined in the portlet.xml file.
The implementation is here also done using an AspectJ aspect. After any aspect has
been proceeded, the filter aspect launches the portlet filter in a recurisve way.
So it really looks and smell like servlet filters but it is not.
Also you are right, we support several MVC frameworks out of the box, it is up to the
developer to choose the one he wants. And we also made our custom one, which we think
is the more adapted for portlets.
IBM, Sun and now eXo have a bridge to integrate existing Struts applications into
portlets.
Cheers,
Benjamin Mestrallet
eXo platform� project leader
eXo platform SARL manager
----- Original Message -----
From: Punit Pandey
To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED]
Sent: Wednesday, December 17, 2003 3:34 PM
Subject: Re: [portlets] Portlets Framework
Hello Benjamin,
Nice to hear you after some time.
What I understood from you post is, eXo has in-built support for MVC framework. Am I
right? Or we have to download it separately? I'll try to check that. As far as I know
IBM has also succeed in using Struts with IBM portal but I haven't checked their
implementation.
But what exactly I wanted to know is how to install request filters for JSR
portlets? Any Idea? How you have done that?
Regards,
Punit Pandey
=================================================
http://portlets.blogspot.com - Portlets blog
http://groups.yahoo.com/group/portlets/ - Portlets Discussion Group
----- Original Message -----
From: Mestrallet benjamin
To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED]
Sent: Wednesday, December 17, 2003 7:20 PM
Subject: Re: [portlets] Portlets Framework
Hello Punit,
We have developed a custom portlet framework that uses a MVC paradigm where
all portlet request go through a portlet controller. It comes with per mode
controllers, J2EE declarative security (not addressed in JSR 168) and full
support of IoC type3.
We also support Portlet filters but note that this is not a mandatory
feature in JSR 168.
Actually with the eXo platform you can also use several existing frameworks
(because of bridges we developed). Therefore you can use existing Struts
application, Java Server Faces application and Cocoon application as
portlets.
Benjamin Mestrallet
eXo platform� project leader
eXo platform SARL manager
----- Original Message -----
From: "Punit Pandey" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>;
"portlets" <[EMAIL PROTECTED]>
Sent: Wednesday, December 17, 2003 2:03 PM
Subject: [portlets] Portlets Framework
> Hello,
> We are in the process of developing one framework for portlets. The
> objective is to apply all possible patterns and also try to simplify the
> development process.
>
> The biggest challenge for developing portlet-framework, seems to us, is
> unavailability of controller servlet. In most of the
JSP/Servlet-frameworks
> (e.g struts) the request always goes through the controller servlet. But
in
> case of a portal, we do not have any such control. Can anyone tell me how
to
> do some sort of request-preprocessing for a portlet? For example if we
want
> to apply some simple filter on request, which is the best place (if any)
do
> to this? How to install common portlet filters?
>
> Regards,
>
> Punit Pandey
>
> =================================================
> http://portlets.blogspot.com - Portlets blog
> http://groups.yahoo.com/group/portlets/ - Portlets Discussion Group
>
>
>
>
>
> To unsubscribe from this group, send an email to:
> [EMAIL PROTECTED]
>
>
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/portlets/
>
> To unsubscribe from this group, send an email to:
> [EMAIL PROTECTED]
>
> Your use of Yahoo! Groups is subject to:
> http://docs.yahoo.com/info/terms/
>
>
To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
----------------------------------------------------------------------------
Yahoo! Groups Links
a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/portlets/
b.. To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
Yahoo! Groups Sponsor
ADVERTISEMENT
------------------------------------------------------------------------------
Yahoo! Groups Links
a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/portlets/
b.. To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
