[Cosmo-dev] Client Side Service Exceptions

[Bobby Rullo]

On Feb 7, 2007, at 9:39 AM, Randy Letness wrote:

> Bobby Rullo wrote:
>> 2) For this specific bug (7572) I don't recommend the ui code  
>> merely re-trying to update the event. This would blow away any  
>> changes that we're just made by the other client. Not sure what a  
>> better solution is though short of a whole conflict resolution ui.  
>> Maybe a dialog box like  "Keep your changes, or get changes from  
>> the server?"
>>
>
> What about grabbing the changes from the server and displaying them  
> in the dialog box along with an option to keep or ignore your changes?
>

Yes, thats fine, but is prob. out of scope for the near future  
(0.6.1) - it would require UI, some sort of a diff engine, etc.

>> Also mde mentions the need of a "This item was deleted by someone  
>> else while you were trying to edit it, so it's gone now." sort of  
>> Exception. The problem is I don't think the server can tell  
>> whether an item is not around anymore because it was deleted, or  
>> because it never existed - it just knows that there is no such  
>> item with a UID of xxxxxxx. The proper thing to do would be to  
>> throw a "NoSuchResource" exception and catch that and have the  
>> client interpret it in the proper way ("The item in question no  
>> longer exists...Do you want to blah blah blah" or something). This  
>> is not implemented yet however, so you'll just get some weird  
>> error from the server.
>
> If you get a NoSuchResource exception, you basically know that the  
> item was deleted right?  Otherwise you wouldn't be able to update  
> the item in the first place.
>

Yes, exactly. My point was that the server doesn't know the  
difference between "NoSuchResourceCuzItNeverExisted" and  
"NoSuchResrouceRightNowButThereUsedToBeSadlyNowItHasBeenRemoved" and  
it's up to the client to make the inference you suggest.

> -Randy
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