[rules-users] Resource Change Scanner Service modified date error

[Esteban Aliverti]

As Dean says, getting the modification time of an in-memory resource is
impossible (actually you need to create an external mechanism to keep track
of it). So I would suggest to change the thrown Exception to something more
meaningful and to explicitly document which resources are capable to be
scanned for changes.
Right now, the Resources capable to being scanned are:

   - ClasspathResource
   - UrlResource
   - FileSystemResource
   - EncodedResource (depending on the implementation of Resource it is
   using)

@Wolfgang, for non in-memory Resources like files or url resources you can
get the last modified time. This is used by the scanner to check if a
particular resource has been modified since the last time it was scanned.
As Dean mentioned, this is not feasible when the resource is an in-memory
resource like a ByteArrayResource.

Best Regards,


XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com impossible  <http://www.plugtree.com>
- Blog @ http://ilesteban.wordpress.com


On Fri, Jan 6, 2012 at 10:51 AM, Dean <dean at qualica.com> wrote:

> @Esteban - I've tried both the ClassPathResource and UrlResource and
> haven't
> actually tried ReaderResource.
>
> I see what you mean with the source code, I did notice that specific error
> message appears for  ReaderResource, but I don't know how my code is
> getting
> there. I will debug it and find out what is going on when I get a moment.
>
> I notice that getLastModified also isn't implemented for
> InputStreamResource
> (with a different error message).
>
> How would you propose returning a modified date for a ByteArrayResource,
> ReaderResource or InputStreamResource as these are in-memory objects and
> don't actually have a modified date?
>
> Regards
>
> Dean
>
> --
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