Re: Obtain the data inside RequestGlobals question

[Neo Anderson]

I run the code and request.getAttribute(USER) returns null in dispatch() 
function. So I output the Request to see what happens; then notice that they 
(Request in Login.java Page and AccessController.java) are two difference 
objects. 

Now it looks like I can obtain the User data by marking the User object as 
SessionState in Login.java Page.

public class Login{
...
        @SessionState
        private User user;
...
        Object onSubmitFromLogin(){
                user = new User(...);
        }
}

Then retrieve User object from dispatch() in AccessController.java 

        public boolean dispatch(Request request, Response response) throws 
IOException{
                ... 
                if(asm.exists(User.class)){
                        User u = asm.get(User.class);
                        ...
                }
        }

However, this rise another question for me - is this a recommended way to 
obtain a temporary User object (because User object in Login Page is only 
constructed temporarily and passed to the backend side for verification)? 

>From my viewpoint, it seems to me that if I have similar situation, then I 
>will put too many temporary objects into Session. Also, how if I have other 
>User object which holds different information (e.g. User object obtained from 
>database), but needs to exist at the same time as that temporarily constructed 
>User object? Will the later override the one that is constructed temporarily 
>(I read Tapestry website saying if I have the same type marked with 
>SessionState annotation, they will use the same reference regardless of their 
>variable name)?

Thanks for advice,

I really appreciate it.

--- On Mon, 8/6/09, Thiago H. de Paula Figueiredo <thiag...@gmail.com> wrote:

> From: Thiago H. de Paula Figueiredo <thiag...@gmail.com>
> Subject: Re: Obtain the data inside RequestGlobals question
> To: "Tapestry users" <users@tapestry.apache.org>
> Date: Monday, 8 June, 2009, 9:49 PM
> Em Mon, 08 Jun 2009 18:40:42 -0300,
> Neo Anderson <javadeveloper...@yahoo.co.uk>
> escreveu:
> 
> > What way is the correct method to set data in the
> Request object in Page and retrieve it back from dispatch
> function?
> 
> Have you really tested the result of that code instead of
> just comparing the two Request instances?
> 
> By the way, unless your Tapestry code is inside an
> application that uses another framework (thus you need to
> read or write info in the session so the other framework car
> access it), use the ApplicationStateManager service
> instead.
> 
> --Thiago H. de Paula Figueiredo
> Independent Java consultant, developer, and instructor
> http://www.arsmachina.com.br/thiago
> 
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