Well, I would want to keep the apps isolated as much as possible, so I
would do something like this...
(1) When App A opens App B, at the same time, it calls a function of its
own that sets a flag in session to indicate that App B is open.
(2) On every page of App A I would have a Javascript function that is
called as a result of a timer started onLoad. This function would be
something like:
function keepAlive() {
try {
if (window.XMLHttpRequest){
ajaxXHR = new XMLHttpRequest();
} else {
ajaxXHR = new ActiveXObject('Microsoft.XMLHTTP');
}
ajaxXHR.open("get", "myKeepAliveAction.do", true);
ajaxXHR.send(null);
} catch(e) {
alert(e.message);
}
}
(3) myKeepAliveAction would do basically nothing, just return null for the
forward.
(4) Be sure to only set the timer onLoad when the flag is set in session
indicating app B is open.
So, what this will do is that when App B is opened, App A would fire this
AJAX request to myKeepAliveAction (be sure to set the timer interval to
something less than App A's timeout period!). That should keep App A from
timing out and you won't have to worry about refreshing any page or
anything.
The only problem I see is what do you do when App B closes? I presume
you'd want the timeout in App A to take effect again, but I don't see a
foolproof way to do that.
--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
On Fri, May 13, 2005 1:47 am, Patrick Lacson said:
> hi Frank,
>
> you're the second person who suggested making an ajax call.. partly
> because its probably a cleaner approach.
>
> do you have an example of how i can use ajax from webapp B to call
> webapp A in some interval period?
>
> thanks much.
>
>
> On 5/12/05, Frank W. Zammetti <[EMAIL PROTECTED]> wrote:
>> If you can use Javascript (and can require it), what you could do is set
>> a timer in app B's onLoad event to call a Javascript function in app A
>> from app B (parent.myFunction();)... This function could refresh
>> whatever the current page is in some interval less than your timeout
>> period. You'll have to ensure all pages of app A have that refresh
>> function in page-scope, and that all pages in B set that timer and make
>> the call.
>>
>> If a full-page refresh isn't feasible, you can make an AJAX call to app
>> A that does really nothing, but that should be enough to keep the
>> session from timing out.
>>
>> Does that all make sense? (I'm not sure I described it well)
>>
>> Frank W. Zammetti
>>
>> -----Original Message-----
>> From: "Patrick Lacson"<[EMAIL PROTECTED]>
>> Sent: 5/13/05 12:56:43 AM
>> To: "Tomcat Users List"<tomcat-user@jakarta.apache.org>
>> Subject: Re: Sessions and keep-alives
>> I've considered iframes, but unfortunately not an option for us.
>>
>> >From what I understand AJAX can make async calls to the HTTP server
>> from the webapplication only, not on behalf of another. So if the
>> popup application is webapp B, and the parent webapp A, how can I
>> call
>> the webapp A server from webapp B for the keep-alive?
>>
>> On 5/12/05, Tim Funk <[EMAIL PROTECTED]> wrote:
>> > The simplest kludge is an iframe that is "hidden" and uses a META
>> refresh.
>> >
>> > Or look at using ajax.
>> >
>> > -Tim
>> >
>> > Patrick Lacson wrote:
>> >
>> > > hi All!
>> > >
>> > > I'm involved in a project that integrates two disparate web
>> > > applications: webapp A is using WebSphere and webapp B is using
>> > > Tomcat.
>> > >
>> > > The integration involves Single Sign On, with webapp A being the
>> > > primary webapp from which webapp B is launched. webapp B is
>> launched
>> > > as a popup-window.
>> > >
>> > > My question is: how can i ensure that while the user is working
>> on the
>> > > webapp B popup, the parent window webapp A, does not time-out?
>> > >
>> > > Thanks in advance!
>> >
>> > ---------------------------------------------------------------------
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>> >
>> >
>>
>> --
>> Patrick
>>
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>>
>
>
> --
> Patrick
>
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