FSImages send out unnecessary cache purges upon first access

[newbery]

Upon startup, with the CMFSquidTool installed and configured to send purge requests, FSImages appear to generate a bunch of unnecessary purges. The cause appears to be due to ZCacheable_invalidate() being called unconditionally, without checking to see if the filesystem moddate has changed.

Perhaps someone can do a sanity check on the patches I've attached?

[Tres Seaver (tseaver)]

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newbery wrote:
> ** Attachment added: "FSObject-FSImage.patch"
> http://launchpadlibrarian.net/21975749/FSObject-FSImage.patch

The patch looks fine to me, although I think I would want unit tests
which verified the new behavior.

Tres.
- --
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Tres Seaver [phone] <email address hidden>
Palladion Software "Excellence by Design" http://palladion.com
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[Jens Vagelpohl (dataflake-deactivatedaccount-deactivatedaccount)]

Thanks for the patch. I added some tests and added it to the SVN trunk for includion in CMF 2.2.0:

http://svn.zope.org/?rev=99882&view=rev