I'm trying to set a unique ID on all files and directories when they are
created; a UUID or GUID.
I setup a create trigger to set a <uuid>{$ guid}</uuid> property on the
file/directory.
However, it would appear that triggers are not fired on directory operations.
Now, working around this, when files are created I check for this property on
the file's parent directory and if it does not exist call
xdmp:document-set-property( $parentUri, <uuid>{$parentUuid}</uuid> ). However,
it would seem that xdmp:document-set-property() is not reentrant because I can
end up with multiple copies of <uuid> on a parent directory. This has actually
happened if I drop a directory with multiple children into a WebDAV folder.
Now we are talking about a concurrency issue and I need to lock the parent
properties before I read and potentially update it... but I don't want to lock
a directory for every file creation because that will cause all transactions in
that directory and subdirectories to fail or be serialized.
If create triggers worked for directories this would not be an issue, we could
set the property on directory creation and be done with it.
Has anyone run into this, and if so how did you solve this problem?
Thanks,
Keith L. Breinholt
ICS Content & Media
[email protected]<mailto:[email protected]>
"Do what you can, with what you have, where you are." Theodore Roosevelt
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