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From Jeff de Vries <jdevr...@pfrog.com>
Subject Re: Caching problem?
Date Wed, 24 May 2006 00:15:58 GMT
Any more thoughts or things I can try to get this to work?

> Looking at the SQL log, it looks like I oversimplified the description 
> of the problem (sorry).  There is actual another table involved, 
> Listing, and the status that is being updated is in Listing, not in 
> Alert, though the Listing is being accessed through the Alert (Alert 
> has a foreign key referencing the Listing).  So, let me try again to 
> describe the sequence of steps that are used to update the database:
> 1)  Using a given Listing, we SELECT all Alerts that refer to that 
> Listing. (In the case I'm looking at there is only one Alert).
> 2)  Start transaction (i.e. there is a (unnecessary?) commit after the 
> previous SELECT)
> 3)  INSERT a new Alert that references the existing Listing (note that 
> at this point the Listing has not been updated yet, i.e. it still has 
> the old status) and the Person the Alert is addressed to.
> 4)  UPDATE the first Alert to indicate it has been processed (i.e. set 
> a 'seen' column to 'true')
> 5)  UPDATE the status in the Listing to the new status (this is the 
> thing we're seeing the old version of later)
> 6)  COMMIT changes.
>
> Later, we do the following:
> 1)  SELECT all Alerts addressed to this Person (which includes the new 
> Alert created in step 3 above; this is also the query to which we 
> added setRefreshingObjects = true, which now looks unnecessary since 
> we did get the new Alert even before making that change)
> 2)  For each Alert, display the status of the Listing referenced by 
> that Alert.  Note that at this point in the SQL log I don't see any 
> SELECT statements trying to retrieve Listing data, so I'm guessing 
> Cayenne thinks it already knows all the associated Listings and their 
> statuses.  It looks like it is the relationship between Alert and 
> Listing that needs to be refreshed?
> 3)  The status for the Listing associated with the new Alert still 
> shows the value it had before it was updated in step 5 above.
>
> So, is it possible that when the new Alert is created it is pointing 
> at the original version of the Listing (I'm talking about the 
> in-memory objects, not the rows out in the database), but when the 
> Listing is updated the in-cache version isn't getting updated?  Or the 
> in-cache version is getting updated, but the Alert is pointing at a 
> stale Listing object? 


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