well yes, there will be two pages pointing to the same dir, but wicket uses
an LRU map to keep only X number of them in session. so eventually it will
go away, you dont need to worry about it
-igor
On 2/11/07, Natto Lover <[EMAIL PROTECTED]> wrote:
Thanks a lot! I'll try what you explained.
Let me clarify the last part of my question.
> > If so, how can I avoid creating duplicate instances for the same
> > domain object when the user clicks the link for the same instance
> > for multiple times?
>
>
> not sure what you mean by duplicate instances of domain objects.
I was thinking of a user navigating through nodes back and forth,
clicking on the same node for multiple times. Lets say that my
application had a file system browser, and the user points to "C:\windows"
then points to somewhere else, then points to "C:\windows" again.
In this case the domain object "C:\windows" would be visited twice,
and If I created a page object everytime I visit a node, there would
be two page objects for C:\windows. That seems to me like an issue.
To make sure that I don't create multiple page objects like this,
I would need some kind of caching here, to make sure only one page
object gets created per one domain object.
Is this a common situation? or is it avoided somehow?
> Date: Sun, 11 Feb 2007 00:34:29 -0800
> From: "Igor Vaynberg" <[EMAIL PROTECTED]>
> Subject: Re: [Wicket-user] Page class instanciation in a tree
> navigated application
> To: wicket-user@lists.sourceforge.net
> Message-ID:
> <[EMAIL PROTECTED]>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On 2/11/07, Natto Lover <[EMAIL PROTECTED]> wrote:
>
> > My questions are:
> > (1) Can I create URLs without instantiating the page objects?
>
>
> wicket has bookmarkable pages ( a page that has a default constructor or
> page(PageParameters) constructor ). you can create a url for this page
> without creating an instance by using requestcycle.urlfor(Class
pageClass,
> PageParameters params) method
>
> (2) For an application with lots of page objects of the same page class
> > but pointing to different domain object instances, how is the Wicket
> > way to create URLs for those different instances?
>
>
> you would put this object id into the pageparameters structure before
> calling urlfor, then retrieve it again in your page's constructor. this
way
> of working is similar to other frameworks where you pass data on the
url.
>
> Or should I simply wait until a link is actually clicked, and within
> > the onClick handler, instantiate a page object, and call
> > setResponsePage(theTargetPage) or something ?
>
>
> usually this would be the way to go, but because you are dealing with
frames
> and want the page to in another frame you cannot.
>
> > If so, how can I avoid creating duplicate instances for the same
> > domain object when the user clicks the link for the same instance
> > for multiple times?
>
>
> not sure what you mean by duplicate instances of domain objects.
>
> also when working with frames dont forget to set a different pagemap for
the
> pages you will open in the right frame. search our wiki for frames, and
see
> a frames example in wicket-examples
>
> -igor
natto is japanese food.
I chose it for my alias.
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