[Kde-pim] Akonadi Question when removing items

[Martin Koller]

On Monday 24 March 2014 09:29:05 Daniel Vrátil wrote:
> On Sunday 23 of March 2014 20:32:08 Martin Koller wrote:
> > Is it possible and correct that if I remove 2 mail items (local mbox, I
> > select two mails and press Shift-Del) that the mbox resource gets the
> > "itemRemoved()" call for the first item, but at this point in time the
> > second items is already no longer in the Akonadi DB ?
> 
> Item removal notification is emitted after the item has been removed from 
> Akonadi database. So it's like you say above, except for that even when the 
> first notification is delivered, the item is no longer in Akonadi.
> 
> > Or more general question: When a client (e.g. kmail) removes an item, is it
> > the client who initiates the final removal of the entry in the Akonadi-DB
> > and the (mbox) resource is just notified about that or does the client just
> > send a request for removal and the (mbox) resource has to handle this ?
> 
> As Kevin  already explained, it's always the client (which can mean an agent 
> too in this case) who performs the item change and owning resource just writes 
> the change into it's storage. 
> 
> > 
> > (I fear it's the first as that is what I see happening)
> 
> Why fear? :-)  It's a perfectly fine behavior, because the resource will still 
> receive RID, which should be all the resource needs to remove the item from 
> it's storage backend.

Because in the mbox resource, the remoteId is depending on other remoteIds
because it contains the position inside the mbox file.
That means itemRemoved() is called, mbox needs to remove the item from the backend
and must change all other remoteIds below it, which means:
fetching their ids and changing, but while fetching, other items may already be gone
from the akonadi db ...

See my other mail from a few minutes ago how I think this could be solved.

-- 
Best regards/Schöne Grüße

Martin
A: Because it breaks the logical sequence of discussion
Q: Why is top posting bad?

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