Re: Arguable bug in PrevaylerDirectory

Alright then! At least I've sounded my opinion now. ;)


      karl

11 jan 2010 kl. 04.18 skrev Klaus Wuestefeld:

> Hi Karl,
>
> We have discussed this in the remote past and it was fun. :)
>
> Conceptually, your migration should be one huge "import" transaction.
>
> In strict prevalence, there is no such thing as "just raw [write]
> access to my root object".
>
> If you are old enough to break the rules, you are old enough to either
> rename the snapshot file or run one dummy transaction before taking
> the snapshot.
>
> See you, Klaus.
>
>
> On Sun, Jan 10, 2010 at 6:46 PM, Karl Wettin <[email protected]>  
> wrote:
>> Hi fora,
>>
>> PrevaylerDirectory row 99 is:
>>
>>                long latestVersion = 0;
>>
>> I claim this is a bug, that it should be -1:
>>
>>                File latestSnapshot = null;
>>                long latestVersion = -1;
>>                for (int i = 0; i < files.length; i++) {
>>                        File candidateSnapshot = files[i];
>>                        long candidateVersion =  
>> snapshotVersion(candidateSnapshot);
>>                        if (candidateVersion > latestVersion) {
>>                                latestVersion = candidateVersion;
>>                                latestSnapshot = candidateSnapshot;
>>                        }
>>                }
>>
>> One could argue that version 0 never would exist, but I say it might.
>> In my case I've been migrating my data from an old system to  
>> Prevayler
>> without using transactions, just raw access to my root object. Taking
>> a snapshot will produce version 0. With latestVersion initialized  
>> as 0
>> this snapshot will not be loaded.
>>
>>
>>        karl
>>
>>
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