Bah. You don't really need to store the pages. You only need to store how they 
can be reconstructed...

Cheers, Anjo



Am 08.03.2010 um 18:07 schrieb Mike Schrag:

> Even within Apple, I would suspect that worked under VERY specific 
> restrictions about what can be in your session at any point in time ... As 
> soon as you start persisting the backtrack cache, it's going to get crazy 
> complicated.
> 
> On Mar 8, 2010, at 11:40 AM, Pascal Robert wrote:
> 
>> So nobody outside Apple have been able to do this? :-(
>> 
>>> when you're done implementing persistent session, let me know ...
>>> 
>>> ms
>>> 
>>> On Mar 8, 2010, at 11:13 AM, Johan Henselmans wrote:
>>> 
>>>> I store a persistent PDsession EO (not related to WOSession): if a user is 
>>>> timed out in a WOSessions, the next time the user logs in, the information 
>>>> from the PDsession is restored unless they explicitely close it.
>>>> 
>>>> The problem that occurs is that sometimes a user logs itself in twice, so 
>>>> the information in the  PDsession is updated from two browsers.
>>>> 
>>>> So I have to prevent a user to log in twice.
>>>> 
>>>> An option I thought of was:
>>>> -store a WOSessionID in thePDsession
>>>> -when the user logs in, check if that session is still available in the 
>>>> applications WOSessionStore.
>>>> -if so, refuse login
>>>> 
>>>> Problem is that (as far as I know) applications do not share the 
>>>> sessionID's so if there would be another WOApplicatiion that has the same 
>>>> requirement, the user would still be able to login.
>>>> 
>>>> So I thought of changing the WOSessionStore to something persistent, 
>>>> instead of residing it in memory, and let the applications that have to 
>>>> make use of such a requirement (user can only login on specific 
>>>> application) to store their sessions in a persistent place.
>>>> 
>>>> In noticed that way is also mentioned in:
>>>> 
>>>> http://developer.apple.com/legacy/mac/library/documentation/MacOSXServer/Reference/WO54_Reference/com/webobjects/appserver/WOSessionStore.html
>>>> 
>>>> "
>>>> There is one subclass of WOSessionStore implemented for the developer's 
>>>> convenience. A server WOSessionStore (the default) stores session state in 
>>>> the server, in application memory. The serverSessionStore method returns 
>>>> this WOSessionStore.
>>>> 
>>>> You can create a custom session store by making a subclass of 
>>>> WOSessionStore. The subclass should properly implement the 
>>>> saveSessionForContext andrestoreSessionWithID methods and should have a 
>>>> public method that the application object can use to obtain an instance. 
>>>> Some interesting session stores could be:
>>>> 
>>>>    • A database session store that stores session data in a database as 
>>>> blobs, with the session ID as the primary key. This kind of WOSessionStore 
>>>> can be shared by many instances of the same WebObjects application, thus 
>>>> distributing the load (requests) among the instances.
>>>>    • An adaptive session store that stores session state either in cookies 
>>>> or on the server, depending on what the client supports.
>>>> If you create your own WOSessionStore class that generates persistent 
>>>> objects, you should implement an algorithm that cleans up session state 
>>>> after the session is inactive for a long time. The server WOSessionStore 
>>>> provided by WebObjects performs this clean-up properly, but the API is not 
>>>> yet public.
>>>> "
>>>> 
>>>> I also noticed that in the Developer Examples  There is the 
>>>> WOSessionStoreExample Framework, that seems to implement something like 
>>>> this.
>>>> 
>>>> Does anybody have any experience with this technique, does it solve the 
>>>> problem I am trying to tackle or is there another approach more 
>>>> appropriate?
>>>> 
>>>> 
>>>> 
>>>> Johan Henselmans
>>>> jo...@netsense.nl
>>>> 
>>>> 
>>>> 
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> 
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