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Posted to user@struts.apache.org by Maya menon <ma...@yahoo.com> on 2007/02/01 19:52:27 UTC
General question
I have a struts based J2ee app which displays data from DB in the results.jsp page. For DB data access, I use a DAO which returns a serialized object. This serialized object, I set it to request object using setAttribute and retrieve it using <bean:write> tag i n jsp page.
My question is: if users try to open another window and do simultaneous tasks, how can I avoid same user from working in two or more different windows in a Struts based j2ee application ?
Any thoughts..
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Re: General question
Posted by Dale Newfield <Da...@Newfield.org>.
Maya menon wrote:
> My question is: if users try to open another window and do
> simultaneous tasks, how can I avoid same user from working in two or
> more different windows in a Struts based j2ee application ?
If your worry is that someone might submit changes to an object that has
changed since the generation of the form (and therefore overwrite
previous changes), maybe a simple solution would be a "version" column
in your table, only persisting submitted changes where the version still
matches what's in the DB.
You don't need to use hibernate to do this, but here's their take on
this:
http://www.hibernate.org/hib_docs/v3/reference/en/html/mapping.html#mapping-declaration-version
-Dale
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[OT] Re: General question
Posted by Dave Newton <ne...@yahoo.com>.
--- Maya menon <ma...@yahoo.com> wrote:
> Yes I had the variable initially set in session.
> Then when I did Cntrl+N[open new window] from the
> existing browser window, I see the same result in
> the second window.
If you open a new window in IE it will take the
parameters from the current window and duplicate them
in the new one (AFAICR). But that shouldn't be an
issue, as any request issued from the new window will
not be shared with the original window. Only if you
are keeping data in session is there a possibility of
something being "over-written".
> what way can the appearence of DB values be
> prevented in multiple windows ?
If everything is in request then there is no possible
way (that I know of, which doesn't mean much :) that
two browser windows are able to make the same request,
by definition.
d.
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Re: General question
Posted by Maya menon <ma...@yahoo.com>.
Dave,
Thanks for the reply.
Yes I had the variable initially set in session. Then when I did Cntrl+N[open new window] from the existing browser window, I see the same result in the second window.
Even when I set it in request object and do[open new window] the same result is being displayed.
what way can the appearence of DB values be prevented in multiple windows ?
Thanks
Dave Newton <ne...@yahoo.com> wrote:
--- Maya menon wrote:
> My question is: if users try to open another
> window and do simultaneous tasks, how can I avoid
> same user from working in two or more different
> windows in a Struts based j2ee application ?
I don't know as you can (easily), but your scenario
doesn't describe a situation in which that would be a
problem. *Session* variables can be a problem
(browser-dependent) but request-based variables
shouldn't be an issue.
DAve "I think I'm just going to change my legal name
to DAve"
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Re: General question
Posted by Dave Newton <ne...@yahoo.com>.
--- Maya menon <ma...@yahoo.com> wrote:
> My question is: if users try to open another
> window and do simultaneous tasks, how can I avoid
> same user from working in two or more different
> windows in a Struts based j2ee application ?
I don't know as you can (easily), but your scenario
doesn't describe a situation in which that would be a
problem. *Session* variables can be a problem
(browser-dependent) but request-based variables
shouldn't be an issue.
DAve "I think I'm just going to change my legal name
to DAve"
____________________________________________________________________________________
The fish are biting.
Get more visitors on your site using Yahoo! Search Marketing.
http://searchmarketing.yahoo.com/arp/sponsoredsearch_v2.php
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Re: General question
Posted by Mauricio Garavaglia <nb...@ncraft.com.ar>.
I think in a bad&ugly (tm) solution using cookies, but you are free to
give it a try ; )
Put a session scoped flag that says "beenthere" in the Action of your
primary form. Null by default this variable will be initialized to
something the first time the user open your Action. If the user try to
open it again the "beenthere" variable will be not null and you can
forward it to somewhere else. Hope this helps. Could post some code but
imho is quite simple.
Regards
Mauricio Garavaglia
Maya menon wrote:
> I am talking about two browser windows.
> User A logs in in browser A and sees DB results in results.jsp page
>
> Then, User A open Browser B from Browser A. if he does that, he will see results in two pages, browser A and browser B. and then he will be able to do different edits from different windows. That should be prevented.
>
> "Hartrich, James CTR USTRANSCOM J6" <Ja...@ustranscom.mil> wrote:
> Are you talking about different browser "windows" or just new "tabs" in
> the same browser? Perhaps try an application scoped variable that tests
> the current user, allowing only one instance of the user to operate the
> app.
>
> -----Original Message-----
> From: Maya menon [mailto:maya_java@yahoo.com]
> Sent: Thursday, February 01, 2007 12:52 PM
> To: user@struts.apache.org
> Subject: General question
>
> I have a struts based J2ee app which displays data from DB in the
> results.jsp page. For DB data access, I use a DAO which returns a
> serialized object. This serialized object, I set it to request object
> using setAttribute and retrieve it using tag i n jsp page.
>
> My question is: if users try to open another window and do
> simultaneous tasks, how can I avoid same user from working in two or
> more different windows in a Struts based j2ee application ?
>
> Any thoughts..
>
>
> ---------------------------------
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> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
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>
>
>
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RE: General question
Posted by Maya menon <ma...@yahoo.com>.
I am talking about two browser windows.
User A logs in in browser A and sees DB results in results.jsp page
Then, User A open Browser B from Browser A. if he does that, he will see results in two pages, browser A and browser B. and then he will be able to do different edits from different windows. That should be prevented.
"Hartrich, James CTR USTRANSCOM J6" <Ja...@ustranscom.mil> wrote:
Are you talking about different browser "windows" or just new "tabs" in
the same browser? Perhaps try an application scoped variable that tests
the current user, allowing only one instance of the user to operate the
app.
-----Original Message-----
From: Maya menon [mailto:maya_java@yahoo.com]
Sent: Thursday, February 01, 2007 12:52 PM
To: user@struts.apache.org
Subject: General question
I have a struts based J2ee app which displays data from DB in the
results.jsp page. For DB data access, I use a DAO which returns a
serialized object. This serialized object, I set it to request object
using setAttribute and retrieve it using tag i n jsp page.
My question is: if users try to open another window and do
simultaneous tasks, how can I avoid same user from working in two or
more different windows in a Struts based j2ee application ?
Any thoughts..
---------------------------------
Everyone is raving about the all-new Yahoo! Mail beta.
---------------------------------------------------------------------
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---------------------------------
Finding fabulous fares is fun.
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RE: General question
Posted by "Hartrich, James CTR USTRANSCOM J6" <Ja...@ustranscom.mil>.
Are you talking about different browser "windows" or just new "tabs" in
the same browser? Perhaps try an application scoped variable that tests
the current user, allowing only one instance of the user to operate the
app.
-----Original Message-----
From: Maya menon [mailto:maya_java@yahoo.com]
Sent: Thursday, February 01, 2007 12:52 PM
To: user@struts.apache.org
Subject: General question
I have a struts based J2ee app which displays data from DB in the
results.jsp page. For DB data access, I use a DAO which returns a
serialized object. This serialized object, I set it to request object
using setAttribute and retrieve it using <bean:write> tag i n jsp page.
My question is: if users try to open another window and do
simultaneous tasks, how can I avoid same user from working in two or
more different windows in a Struts based j2ee application ?
Any thoughts..
---------------------------------
Everyone is raving about the all-new Yahoo! Mail beta.
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