Olivier Grisel ha scritto:
> Eric Barroca a écrit :
>
>> Hi,
>>
>> On 26 avr. 07, at 10:46, Olivier Grisel wrote:
>>
>>> We will probably soon need to store checksums of file attachments as
>>> part of a customer project. The goal is to be able to quickly find
>>> dupes when importing a bunch of files from a file-system folder to a
>>> nuxeo workspace.
>>> I wondered if it would be relevant to add sha (or md5 ?) checksums by
>>> default in nuxeo, either as a Blob new feature or in a dedicated field
>>> of the file schema computed by a core event listener.
>>>
>> Yes it is, as long as the computation of the checksum is done
>> asynchronously after an upload.
>>
>
> Asynchronous checksum computation and (transactional) integrity feel a bit
> antinomic to me but I am aware that this can be a performance problem and
> should
> thus be configurable.
>
> Another problem is for very large files: the checksum should be computed on
> the
> core side to have a sufficiently low level access to the binary stream so as
> not
> to have to load the content in memory nor to stream it over a remote network
>
> layer of any sort. That's why it might be interesting to have it part of the
> Blob default interface or maybe as an extension of it.
>
A little question "blob" type is the same type of "file"?
Or they are different documents types?
Thanks
Mirto
>
>> It can definitely add many possible use
>> case for the platform especially when dealing with large files.
>> So go on for NXP without forgetting to add the corresponding JIRA
>> ticket. :-)
>>
>
> Yes sure:
>
> http://jira.nuxeo.org/browse/NXP-897
>
>
--
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Mirto Silvio Busico ICT Consultant
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