It works but ....
Jonathan Locke wrote:
i still don't see what this has to do with client side state. it seems like that's a separate issue.
it looks like the thing that needs to be done is deep cloning the model as part of undo state recording...
Jan Blok wrote:
Hi,
the main problem is that i don't understand (and johan probably posted this but i don't have it)... exactly what problem are we trying to solve here?
Johan was explaining the problems with the browser "back" button, in for example a workflow application where the user has to process 5 records which are rendered to him one after another, by replacing the model(object) in a component on the server. At a certain point he decides to go back to fill-in something he missed, when he now submits the page to the server there is a browser-to-model out of sync problem, which can be solved by attaching an uuid to each model and rendering this to the browser
Another problem I can imagion is a user deleting a list item, going back with back button, submit a change, now he edits unknowingliy the item after the deleted item, this also can be detected by an uuid
So im suggesting a "hard" link between a rendered output and server model object instance..., by means of a uuid which the developer "can" choose to use in his model implementation. (instead of the current component name binding only, thus without binding on the component model object instance)
Regards Jan Blok
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jonathan Locke
Sent: Monday, March 07, 2005 6:52 PM
To: [email protected]
Subject: Re: [Wicket-develop] More Model suggestions, was "backbutton problem"
with this wacky email server on sourceforge i have your response but not johan's original post!
DetachableModel was replaced by AbstractDetachableModel, which is designed for anonymous subclassing.
yes, a UUID ought to be a low security risk in most cases and would be less of a performance problem than other options for client side state.
however, i think AbstractDetachableModel is useful in its own right and that we ought to keep it as-is.
i'm having trouble with your sketch below for several reasons i can't quite articulate yet...
the main problem is that i don't understand (and johan probably posted this but i don't have it)... exactly what problem are we trying to solve here?
i don't see any real advantage to storing a UUID on the client if you still have a Page and a model on the server. you haven't reduced the server state to zero. if you want zero server state, that is already supported via bookmarkable pages. a bookmarkable page constructs itself entirely from request information. you can stick your UUID in PageParameters and pass that to BookmarkablePageLink and away you go. when the request comes in your page will be created and you can synthesize your page's model and structure based on the abstracted request information in PageParameters. i think this is actually quite elegant and simple in terms of solving the problem of constructing zero-state pages.
Jan Blok wrote:
any actionHi,
somehow we have to have more state loaded into the client (but i don't like this, get .NET feelings now...)
so that the right model can first be created again before
(form population from the request and the action handling)
any other ideas?
johan
I totally agree with Johan, is it an idea to change
IDetachableModel to?
:
public interface IDetachableModel extends IModel { public String getUUID();//max length 36 chars, limit this to prevent flooding the page like .NET
public void attach(String uuid);
public void detach(); }
Hmm, IDetachableModel is changed to IDetachable? Recently?
If you pass the uuid into the pagereponse (forms/links) if the model returns one, it can be used to lookup the correct modelstate at all times.
Max length 36 is for a GUID alike thing like:
10030100-E260-11CF-AE68-00AA004A34D5 so you can address any
molecule in
the universe :-), instead of a GUID you could use a uuid like "orders_23461567" for specific hibernate "order" object. By keeping the length limited you also prevent HTTP-POST req. as .NET has for any action.
Regards Jan Blok
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