Thank you for your reply Benjamin.
It seems you did do something similar to what we need to do as well (placing
some metadata content from the FCRepo to a low level storage).
As I mentioned earlier, our implementation of the akubra plugin automatically
processes the hints it gets with the object. Moreover, in
DefaultDomManager(https://github.com/fcrepo/fcrepo/blob/master/fcrepo-server/src/main/java/org/fcrepo/server/storage/DefaultDOManager.java),
the following line takes care of populating and sending the hints to the low
level store.
m_permanentStore.addObject(obj.getPid(),
new ByteArrayInputStream(out.toByteArray()),
objectHints);
Hence I will need to just implement the interface
FedoraStorageHintsProvider(https://github.com/fcrepo/fcrepo/blob/master/fcrepo-server/src/main/java/org/fcrepo/server/storage/FedoraStorageHintProvider.java)
such that the overriding methods return the required metadata.
I wanted to know if I will need to sumbit my code(the class that will implement
the above interface) as a part of FCRepo only?(That's the only way I see it as
of now)
Or precisely, does this mean that my implementation would/should be a part of
the FCRepo rather than being a part of my akubra plugin?
Thanks,
Nikhil
From: Benjamin Armintor [mailto:armin...@gmail.com]
Sent: Tuesday, March 05, 2013 9:42 AM
To: fedora-commons-developers@lists.sourceforge.net
Subject: Re: [fcrepo-dev] Fedora Commons Release 3.6: Suggestion regarding
Fedora Hints Provider API
Nikhil-
Not only is that appropriate, but it's something the FedoraFutures tech team
worked on earlier this year, too (I was trying to get FCRepo to place some
content into AWS-Glacier). I think you may find, depending on how your Akubra
plugin works, that the lack of a hints provider on retrieval is an obstacle,
too. There's also some uncomfortable division of labor between the actual
client of the hints provider (the DOManager, if I remember right) and the
consumer of the hints (the LLStore).
- Ben
On Tue, Mar 5, 2013 at 8:41 AM, Tayal, Nikhil
<ntay...@illinois.edu<mailto:ntay...@illinois.edu>> wrote:
Hi,
I am currently working on adding some features to a Plugin built by our Library
Software development group at UIUC Library. The plugin enables support for Dell
DX6000 devices with Fedora Commons.
(https://github.com/medusa-project/akubra-dell-dx)
One of the requirements we have is to be able to get the metadata like
'Content/MIME-type' from fedora before persisting the fedora object to device.
I read about the new features in the 3.6 release of Fedora and I wanted to
leverage the FedoraHintsProvider interface which enables us to send metadata in
the hints argument while persisting the object to akubra.
(We already have the capability in our plugin to capture the information sent
in the hints argument and use it further, hence all I need to do is to
implement the above interface to send those hints).
The obvious way to do that is to add a class which has the implementation of
the methods of the FedoraHintsProvider interface in the Fedora Commons
repository. These methods will fetch the required metadata information. Then we
can inject that implementation as a dependency using the spring configuration
file.
However, this will require me to change the codebase of fedora repository and
add my implementation there. Ideally, I want the implementation to be a part of
our plugin(the akurba-dell-dx implementation that interfaces with Dell storage
devices).
Can you please let me know if what I am considering to do is even possible(and
an appropriate approach)?
Thanks and Regards,
Nikhil Tayal
Graduate Student(Masters in Computer Science) and Programmer(Digital Library
Research Lab)
University of Illinois at Urbana Champaign
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