Hi again,
seems i was mistaken on the meaning of this parameter, my apologizes. It
specify the number of view AND states stored (thus not only the view
structure as i thought). Anyway, if you think this value does not fit
your needs, just change it:
<context-param>
<param-name>org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION</param-name>
<param-value>20</param-value>
<description>Only applicable if state saving method is "server" (=
default).
Defines the amount (default = 20) of the latest views are
stored in session.
</description>
</context-param>
http://wiki.apache.org/myfaces/Performance
Randahl Fink Isaksen a écrit :
> Thanks David - that was very informative.
>
> I can't help but thinking that quite many applications would want to
> lower the NUMBER_OF_VIEWS_IN_SESSION from the default 20. I mean if
> the user really visits the same website 20 times and thus sees view 1,
> 2, ..., 20, what are the chances that he will go back and visit, say,
> view 4? On many sites I would assume that the chance of that is quite
> low, which could indicate that a much lower number would be relevant.
>
> Suppose you lower the NUMBER_OF_VIEWS_IN_SESSION to, say, 5, there
> will obviously be a greater chance that the user will revisit a view
> that is no longer cached, but since the server is supposed to be able
> to deliver that view pretty fast on his first visit anyway it will of
> course also be able to deliver the view quite fast on his second visit
> even though the view is not cached.
>
> So why is 20 the default?
>
>
> Randahl
>
>
>
> David Delbecq wrote:
>> 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
>>>
>>>
>>
>>
>>
>>
