Hi Kim,
Thanks for the email. That got me going in the right direction.
Is it likely that the media filters will get transferred over to curation
tasks? It seems like a natural place for them.
I saw that currently the distribute function walks sequentially over
communities and collections; I could see a version in the future that does
this in parallel.
Stuart pointed me towards Bill Hays' talk at OR2011. I saw that Curation
tools can handle scripted tasks in Groovy, Jython, etc. Is this available
in 1.7.2 or is it something forthcoming in 1.8.0?
I can see a lot of applications for curation tasks. I'd like to see them
take off.
What can I do to help?
Thank You again,
Joseph
On Tue, Jul 12, 2011 at 19:47, Kim Shepherd <[email protected]> wrote:
> Hi Joseph,
>
> Here's an example of a private method I use with a curation task that
> sets policies based on item metadata.
> This method would be called by the perform() method that each curation
> task overrides from AbstractCurationTask.
>
> I've simplified it here, so all it's doing is removing ANONYMOUS: READ
> from the item, the item's bundles, and bitstreams in those bundles.
>
> You could choose to remove ALL group policies rather than just
> anonymous, and you could choose to add more policies afterwards. The
> Javadoc for AuthorizeManager is probably your best bet if you want to
> get into more detail.
>
> private static void applyClosedAccess(Item item) throws
> SQLException, AuthorizeException
> {
> String handle = item.getHandle();
> Bundle[] bundles = {};
> results = "";
> for(String bundleName : bundlesToCurate)
> {
> bundles = item.getBundles(bundleName);
>
> for (Bundle bundle : bundles)
> {
> // Remove all existing policies related to Anonymous actions
> log.debug(handle + ": Removing Anonymous READ from
> bundle " + bundleName);
> AuthorizeManager.removeGroupPolicies(c, bundle, anon);
>
> for (Bitstream bs : bundle.getBitstreams())
> {
> AuthorizeManager.removeGroupPolicies(c, bs, anon);
> }
>
> }
> results += handle + ": Successfully applied Closed Access
> policies on " + bundleName + " and its bitstreams\n";
> }
> }
>
> "anon" is a Group I get by doing a findGroupByName.
> "c" is context
> "bundlesToCurate" is just a string[] set in config, so my repo admins
> can choose which bundles to apply policies to
>
> You're right about needing context -- that shouldn't be too much of a
> problem, just declare it in your task class
>
> private static Context c;
>
> And then initialize it in your overridden init() method. Something like:
>
> try {
> c = new Context();
> } catch(Exception e) {
> status = Curator.CURATE_ERROR;
> String results = "Could not obtain context: " +
> e.getLocalizedMessage();
> setResult(results);
> report(results);
> return;
> }
>
> To keep tasks over large sets of items running smoothly, and to make
> sure successful 'perform' operations are committed, I also do this at
> the end of perform(), just before the return statement
>
> try {
> c.commit();
> } catch(Exception e) {
> status = Curator.CURATE_ERROR;
> results = "Could not commit context: " +
> e.getLocalizedMessage();
> setResult(results);
> report(results);
> return status;
> }
>
>
> Let me know if any of this doesn't make sense.
>
> I have a pile of curation tasks to share, once we figure out the best
> place to publish / distribute / review them...
>
> Cheers!
>
> Kim
>
>
> On 13 July 2011 07:46, Joseph <[email protected]> wrote:
> > Hi Stewart,
> > I think a curation task will do just the trick.
> > I've created one that is able to identify the appropriate items. Now I'm
> > trying to set their policies.
> > Is it appropriate do do this through the Authorization Manager or
> directly
> > through the Item.
> > In either case, I think I need to obtain the context to be able to do
> this,
> > but I am unsure how to do so.
> > You said that you have classes that change policies; how did you
> accomplish
> > this?
> > Thank You for your help.
> > -Joseph
> >
> >
> >
> >
> >
> > On Thu, Jul 7, 2011 at 17:08, Stuart Lewis <[email protected]>
> wrote:
> >>
> >> Hi Joseph,
> >>
> >> > I am developing an archive for an archaeology lab where some of the
> >> > items are deemed "sensitive" by the collection owner. (Usually if
> they
> >> > contain pictures of human remains or artifacts involved in burial
> >> > ceremonies.)
> >> >
> >> > It is usually very clear in the metadata if an item should be declared
> >> > "sensitive".
> >> > I'm looking for someplace to insert a boolean check that would then
> >> > change the item policies such that only members of the "Sensitive Data
> >> > Viewer" group could see the item.
> >>
> >> We do this using the 'curation' system which was introduced in DSpace
> 1.7.
> >> See:
> >>
> >> - http://www.dspace.org/1_7_1Documentation/Curation%20System.html
> >>
> >> This allows you to write classes that can perform tests and make changes
> >> to applicable items (their metadata / permissions / bitstreams etc).
> They
> >> can either be run automatically at certain points such as during the
> >> workflow, by hand in the XMLUI interface, or as a scheduled cron job.
> >>
> >> We have a lot of quite specialised curation tasks to perform jobs such
> as
> >> changing bitstream authorizations, making derivative bitstreams, and
> >> enhancing metadata.
> >>
> >> There were some good sessions about this at the recent Open Repositories
> >> conference:
> >>
> >> -
> https://conferences.tdl.org/or/OR2011/OR2011main/paper/viewFile/431/102
> >> -
> >>
> https://www.facebook.com/notes/mire/curation-tasks-in-dspace-an-open-repositories-2011-workshop-report/10150208313003768
> >>
> >> Thanks,
> >>
> >>
> >> Stuart Lewis
> >> Digital Development Manager
> >> Te Tumu Herenga The University of Auckland Library
> >> Auckland Mail Centre, Private Bag 92019, Auckland 1142, New Zealand
> >> Ph: +64 (0)9 373 7599 x81928
> >>
> >
> >
> >
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