Hi randahl,
I recommend you take a look at the JSF lifecycle and more particulary at
the 'Restore view' and the 'Render response' part.
http://www-128.ibm.com/developerworks/java/library/j-jsf2/#N100A9
The view is a set of components. The components are read (initial view)
with their static values and their EL values and then rendered multiple
time. It's at render time that the 'day/night' should be evaluated. If
you have this in you page:
<myCustomComponents:backgroundColor
calor="#{dayBean.isNight?'#000000':'#FFFFFF'}/> then you are sure that
background color will always be correct as long as dayBean.isNight() is
correct.
Randahl Fink Isaksen a écrit :
> I read that the default for NUMBER_OF_VIEWS_IN_SESSION is 20, meaning
> that MyFaces will store the latest 20 of a client's views in the
> client's session. This made me wonder how MyFaces tells the difference
> between the views and how MyFaces know when to reuse a view. For
> instance if you visit "/aView.jsf" in a browser how can MyFaces tell
> whether that view can be safely stored and reused later in the session
> if you visit the same view again?
>
> Let me give an example: Let us say that the view on the address
> "/aView.jsf" uses a component which makes the background color of the
> page white during daytime and black during the night. If I then visit
> the view just before nightfall and receive a white page and then
> revisit the view during the same session but right after nightfall,
> what color will the view then be? I would think that if the original
> view is reused it would still be white even though it should actually
> now have changed to black. So how can I as a developer tell MyFaces
> whether or not it is safe to store the information about the
> background color and for how long the information is valid?
>
> Has anyone found some documentation about this?
>
> Thank you
>
> Randahl
>
