sorry for come late.
but i talk about singleton page in level of session/user and not in
level
application
user1 has one and only one instance of page A
user2 has one and only one instance of page A (not equals with page of
user1)
==========
On Tue, 21 Mar 2006 12:11:45 +0430, Martijn Dashorst
<[EMAIL PROTECTED]> wrote:
> You probably can manage to make the page a singleton, but I strongly
> discourage you from trying.
>
> You are in a multithreaded environment. Wicket pages are stateful,
which
> means you can't safely share them across threads. As a consequence a
page
> can not be shared between sessions, and that is what you do when you
> build a
> singleton.
> When you let Wicket 'manage' your pages, i.e. you just create pages on
> the
> fly, you won't run into multithreading problems. Wicket will
synchronize
> for
> each session on the session with an incoming request. So per user you
> won't
> have threading issues.
>
> I can't think of any web framework that supports this way of working,
> perhaps the action oriented frameworks (webwork, struts). Wicket is
not
> like
> that. Wicket creates statefull pages and components, which means they
> cannot
> be shared between threads at the same time. Even Tapestry doesn't
support
> singletons, but uses page pooling. And because of that, they had to
> create
> some magic to make the pages loose their state when the page is put
back
> into the pool.
>
> If you are /that/ concerned with memory, then you probably shouldn't
use
> Wicket. Not because we don't think Wicket is up for the task, but I
think
> you'd have more fun with Tapestry or another framework that let's you
> work
> the way you want.
>
> Martijn
>
>
> On 3/21/06, ali <[EMAIL PROTECTED]> wrote:
>>
>> On Tue, 21 Mar 2006 04:47:13 +0530, Martijn Dashorst
>> <[EMAIL PROTECTED]> wrote:
>>
>> i want suppose can EditBook be is singleton .
>>
>> > new Link("editLink") {
>> > protected void onClick() {
>> > Book book = (Book)getParent().getModelObject();
>> > setResponsePage(new EditBook(book));
>> > }
>> > }
>> >
>> > Should work.
>> >
>> > Martijn
>> >
>> > On 3/20/06, ali <[EMAIL PROTECTED]> wrote:
>> >>
>> >> On Mon, 20 Mar 2006 14:18:48 +0530, Johan Compagner
>> >> < [EMAIL PROTECTED]>
>> >> wrote:
>> >> can i do like :
>> >>
>> >> class BookList extends WebPage {
>> >>
>> >> public BookList() {
>> >>
>> >> add(new ListView("booksList", booksList){
>> >>
>> >> public void populateItem(ListItem item) {
>> >>
>> >> add(new Link("editLink") {
>> >> EditBook page =
>> >> EditBook.getInstance();
>> >> page.setModel(new
>> >> CompoundPropertyModel(item.getModelObject ())); //or
>> >> line also move to page
>> >> setResponsePage(page);
>> >> }
>> >> });
>> >> }
>> >> }
>> >>
>> >> if i can do this then what effects do it put in on end-user of
app?
>> >>
>> >> > you can reuse pages just fine for one session ofcourse if you
want.
>> >> >
>> >> > So in youre BookList you hold on to an internal page BookDetails
or
>> >> > EditBook
>> >> > page
>> >> > And when you click on a view/edit link you just reuse that page.
>> >> >
>> >> > I wouldn't share pages across sessions.
>> >> >
>> >> > johan
>> >> >
>> >> >
>> >> > On 3/20/06, ali <[EMAIL PROTECTED]> wrote:
>> >> >>
>> >> >> i am new in wicket , it's correct that we tell
>> >> >>
>> >> >> 1- always use getPageFactory.newPage() instead "new".
>> >> >>
>> >> >> 2- if a user view/edit 4 book in its session , for him/her
>> created 4
>> >> >> BookDetails and 4 EditBook page object.(why this needed)
>> >> >>
>> >> >> do we can define page be singleton in level of handler thread
or
>> >> session
>> >> >> (i remember ThreadLocal)? so that like swing only once EditBook
or
>> >> >> BookDetails pages instanced and for next book only needed that
>> call
>> >> on
>> >> >> them setBook(booK);
>> >> >>
>> >> >> refrence to these pages can keep in session and also they can
>> >> >>
>> >> >> or maybe i must more read examples and docs
>> >> >>
>> >> >> --
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>> >
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