Now,
I have a panel in my home page with a PageableListView. When I Page the List to page 2view and then somewhere in my application
I perform a setResponsePage(new HomePage(...)). My PageableList which was originally in Page 2 goes back to page 1. i dont want that to happen..what do i do?
Cuz i am considering keeping the reference of that page all around?
On 3/21/06, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
if i recall from the podcast HLS says that in his mind pages have a fairly static component hierarchy - this is why it is easy to pool them. once you create a page you dont really add/change components - that is the tapestry model for the most part.
in wicket pages are dynamic, you are free to change the hierarchy at any time in any way that you want - this is why a singleton page makes little sense.
as i said before, this is a non issue until it shows up as a hotspot. until then you are optimizing way too prematurely.
-Igor
On 3/20/06, 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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