[imp] Horde cache problem

[Jochen Roderburg]

Zitat von lst_hoe02 at kwsoft.de:

> Zitat von Jochen Roderburg <Roderburg at Uni-Koeln.DE>:
>
>> When I have a running webmail session with activated Horde cache  
>> and  another mail program is changing something on the mail server,  
>> the  changes are not reflected on the webmail side.
>>
>
> At least for IMAP folders this is documented:
>
> [cache_folders]
> If set to true, note that any folders created on the server during  
> an  IMP session that are NOT created via IMP will not be displayed  
> until  the next login. If IMP will be the exclusive means of  
> accessing the  mail server, or you are not concerned about this  
> behavior, this  setting should be set to true.

Yes, I have seen and understood this particular case and have decided  
that I am "not concerned about this behavior".

> But for message status, delete, new etc. it's working fine here with  
>  Cyrus as IMAP server and parallel access with Thunderbird (IMAP)  
> and  IMP/Horde. You have to wait for refresh for sure but this is  
> standard  IMAP behavior.

These are the cases that trouble me.

When I read now that this works in your installation and see no  
warnings in the configuration dialogs, I think it is really the  
correct intended behaviour that changes on the mailserver are shown  
and I have a "special" problem here. General experience says then that  
in such strange cases the real cause is "something completely  
different".

A test scenario here:

"Old" IMP (Horde2/IMP3)
"New" IMP (Horde3/IMP4) with activated Horde cache
Thunderbird 3.1

When I sent a new mail to my account, it is shown in all three  
candidates. In Thunderbird immediately, in the IMP's after a (manual  
or automatic) refresh of the mailbox list.

I delete the mail now in the Old IMP (IMAP delete) and it is shown  
there as deleted. In Thunderbird it is also immediately shown as  
deleted. In the New IMP
it is *not* shown as deleted, and I do not find a way to persuade it  
to display this correctly. No webmail refreshes help, no Browser  
refreshes. I can logout and re-login. I can login on different systems  
with different browsers, everywhere it is displayed as not deleted. It  
even survives a complete server restart.

The only way I found to get rid of the situation is to deactivate the  
Horde cache or clear the cache storage (memcached meanwhile).

Can anybody tell me how this whole thing is supposed to work  
internally? How does IMP find out that something has changed on the  
IMAP server and its cached version is no longer valid?

Best Regards,
Jochen Roderburg