No, nothing is lost... That's why it's cool
Go ahead and try it!
Karthik N wrote:
> Hi Andy,
>
> Pardon my ignorance - this is my first serious stint with
> EnhancementWorkers.
>
> So in our case we want to write up a Custom EnhancementWorker that
> enhances the renderComponent() method. Since the tacos worker
> InjectAjaxComponentRenderWorker is already enhancing renderComponent()
> method, are we not in a contention situation where two enhancement
> workers are enhancing the same method and one would override the
> changes of the other?
>
> So for eg InjectAjaxComponentRenderWorker would inject some code in
> renderComponent()
>
> public void renderComponent() {
>
> //InjectAjaxComponentRenderWorker's code goes here
>
> }
>
> And after Custom EnhancementWorker we should reach a situation where
>
> public void renderComponent() {
>
> //InjectAjaxComponentRenderWorker's code goes here
> //Custom EnhancementWorker's code goes here
>
> }
>
> And NOT a situation where we lose InjectAjaxComponentRenderWorker's
> contribution like below!
>
> public void renderComponent() {
>
> //Custom EnhancementWorker's code goes here
>
> }
>
>
>
> Thanks, Karthik.
>
>
> On 11/14/06, *andyhot* <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
> wrote:
>
> Tapestry will eventually apply all the enhancers +
> it'll do this in the order you define when you contribute to
> tapestry.enhance.EnhancementWorkers
>
> So, you don't really have to override tacos worker...
>
> I guess it's your choice but i'd go for a new worker...
> it feels more correct
>
>
>
> Karthik N wrote:
> > Hi Andy!
> >
> > Thanks for the pointer.
> >
> > Our idea is to actually override the renderComponent() method to
> > implement our security concerns.
> >
> > We want to write a custom EnhancementWorker to change the IWriter
> > accordingly after calling a SecurityContext.isUserInRoles( {'ADMIN',
> > 'SUPERVISOR'} ) which will check a ThreadLocal etc. (left out
> the gory
> > details)
> >
> > But since the renderComponent() method is already enhanced by tacos
> > InjectAjaxComponentRenderWorker, it appears that we would need to
> > extend this class and add our code in the subclass?
> >
> > And also override in hivemind using the approach here -
> > http://hivemind.apache.org/override.html
> >
> >
> > Any thoughts?
> >
> > Thanks! Karthik
> >
> > On 11/14/06, *andyhot* <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]> <mailto:[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>>>
> > wrote:
> >
> > tacos also registers a FormComponentEventWorker.
> > It's responsible for adding 2 more parameters to all form
> > components...
> > "eventListener" and "formatter"
> >
>
> https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/java/net/sf/tacos/ajax/impl/FormComponentEventWorker.java
>
> <https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/java/net/sf/tacos/ajax/impl/FormComponentEventWorker.java>
> >
>
> <https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/java/net/sf/tacos/ajax/impl/FormComponentEventWorker.java
>
> <https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/java/net/sf/tacos/ajax/impl/FormComponentEventWorker.java>>
> >
> > Here's their registration
> >
>
> https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/descriptor/META-INF/tacos.enhance.xml
>
> <https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/descriptor/META-INF/tacos.enhance.xml>
> >
>
> <https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/descriptor/META-INF/tacos.enhance.xml
>
> <https://svn.sourceforge.net/svnroot/tacos/tacos-4.0/trunk/tacos-core/src/descriptor/META-INF/tacos.enhance.xml>>
> >
> > So, my question is why don't you create your own enhancment
> worker and
> > contribute it to
> > tapestry.enhance.EnhancementWorkers configuration point?
> >
> >
> >
> > Karthik N wrote:
> > > Hello,
> > >
> > > Tacos 4.0.1 - We are contemplating adding an EnhancementWorker
> > to the
> > > renderComponent method of AbstractComponent.
> > >
> > > The idea is to be able to perform certain "Security"
> operations
> > in a
> > > (hopefully) elegant fashion.
> > >
> > > For eg. we have cases where a Tab should hide/show itself, a
> > TextField
> > > should hide/show itself.
> > >
> > > Here are the thoughts:
> > >
> > > 1) Introduce a formal parameter for each component
> something like
> > > renderIfUserInRoles ognl:{'ADMIN', 'SUPERVISOR'}
> > >
> > > 2) A custom EnhancementWorker to change the IWriter
> accordingly
> > after
> > > calling a SecurityContext.isUserInRoles ( {'ADMIN',
> 'SUPERVISOR'} )
> > > which will check a ThreadLocal etc. (left out the gory
> details)
> > >
> > > 3) If the user is not in roles pass on a NullWriter to the
> > component,
> > > so that it will not render its content.
> > >
> > > So here are the questions:
> > >
> > > 1) After some digging we find that
> InjectAjaxComponentRenderWorker
> > > already enhances AbstractComponent.renderComponent().
> Methods of
> > > this Worker are protected, so we plan to further override this
> > > implementation and use the approach described in
> > > http://hivemind.apache.org/override.html to override the
> > service-point
> > > id="ComponentRenderInterceptor"
> > >
> > > 2) Is this a good idea?! We would love to hear some feedback.
> > >
> > > Thanks, Karthik
> > >
> >
> ------------------------------------------------------------------------
>
> > >
> > >
> >
> -------------------------------------------------------------------------
> >
> > > Using Tomcat but need to do more? Need to support web
> services,
> > security?
> > > Get stuff done quickly with pre-integrated technology to make
> > your job easier
> > > Download IBM WebSphere Application Server v.1.0.1 based on
> > Apache Geronimo
> > >
> >
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642>
> > <
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
>
> <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642>>
> > >
> >
> ------------------------------------------------------------------------
> > >
> > > _______________________________________________
> > > Tacos-devel mailing list
> > > [email protected]
> <mailto:[email protected]>
> > <mailto: [email protected]
> <mailto:[email protected]>>
> > > https://lists.sourceforge.net/lists/listinfo/tacos-devel
> > >
> >
> >
> > --
> > Andreas Andreou - [EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]> <mailto:[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> -
> > http://andyhot.di.uoa.gr
> > Tapestry / Tacos developer
> > Open Source / J2EE Consulting
> >
> >
> >
> -------------------------------------------------------------------------
> >
> > Using Tomcat but need to do more? Need to support web services,
> > security?
> > Get stuff done quickly with pre-integrated technology to
> make your
> > job easier
> > Download IBM WebSphere Application Server v.1.0.1 based on
> Apache
> > Geronimo
> >
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642>
> >
> <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
>
> <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642>>
> > _______________________________________________
> > Tacos-devel mailing list
> > [email protected]
> <mailto:[email protected]>
> > <mailto:[email protected]
> <mailto:[email protected]>>
> > https://lists.sourceforge.net/lists/listinfo/tacos-devel
> > < https://lists.sourceforge.net/lists/listinfo/tacos-devel>
> >
> >
> >
> >
> ------------------------------------------------------------------------
> >
> >
> -------------------------------------------------------------------------
>
> > Using Tomcat but need to do more? Need to support web services,
> security?
> > Get stuff done quickly with pre-integrated technology to make
> your job easier
> > Download IBM WebSphere Application Server v.1.0.1 based on
> Apache Geronimo
> >
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642>
> >
> ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Tacos-devel mailing list
> > [email protected]
> <mailto:[email protected]>
> > https://lists.sourceforge.net/lists/listinfo/tacos-devel
> >
>
>
> --
> Andreas Andreou - [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> -
> http://andyhot.di.uoa.gr
> Tapestry / Tacos developer
> Open Source / J2EE Consulting
>
>
> -------------------------------------------------------------------------
>
> Using Tomcat but need to do more? Need to support web services,
> security?
> Get stuff done quickly with pre-integrated technology to make your
> job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642>
> _______________________________________________
> Tacos-devel mailing list
> [email protected]
> <mailto:[email protected]>
> https://lists.sourceforge.net/lists/listinfo/tacos-devel
> <https://lists.sourceforge.net/lists/listinfo/tacos-devel>
>
>
>
>
> --
> Thanks, Karthik
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> ------------------------------------------------------------------------
>
> _______________________________________________
> Tacos-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/tacos-devel
>
--
Andreas Andreou - [EMAIL PROTECTED] - http://andyhot.di.uoa.gr
Tapestry / Tacos developer
Open Source / J2EE Consulting
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