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From "Mattmann, Chris A (388J)" <chris.a.mattm...@jpl.nasa.gov>
Subject Re: MetadataBasedFileVersioner and custom metExtractor
Date Thu, 03 Nov 2011 05:16:32 GMT
Hi Ricky,

You're running into the issue of where/when Versioning is done. 

Right now you are using a server-side met extractor -- that metadata is extracted on the server
side, cataloged, 
but is _not_ passed back to the client, for use in client-side versioning (which I'm guessing
you're using). 

One way around this is to take an approach similar to the FinalFileLocationExtractor -- that
is: make your 
versioner run the server side met extractor as part of its versioning process to derive the
same metadata 
that you want used for versioning. Or, alternatively, bake in somehow (to the metadata stream
that you 
use in read-only form in the versioner) the field that you are interested in flowing through.

HTH!

Cheers,
Chris

On Nov 2, 2011, at 4:20 PM, Nguyen, Ricky wrote:

> Hi,
> 
> My MetadataBasedFileVersioner can't see the met produced by my custom metExtractor
> 
> I've read OODT-72. That issue describes using the Versioner's calculated Reference to
assign Metadata (ver -> met). My issue is the opposite direction, using extracted Metadata
in the Versioner's Reference calculation.
> 
> For example, suppose my metExtractor assigns a value to the "MRN" element. Then I want
my versioner to create a datastore reference at "/[MRN]/[Filename]".
> 
> My product-types.xml (abbreviated):
> <type name="CustomProdType"/>
>  <versioner class="CustomMetBasedFileVersioner"/>
>  <extractor class="CoreMetExtractor"/>
>  <extractor class="MimeTypeExtractor"/>
>  <extractor class="MRNExtractor"/>
>  <extractor class="FinalFileLocationExtractor"/>
> </type>
> 
> After I ingest the file, I dump the met (using MetadataDumper) and the product (using
ProductDumper). The met looks fine:
> <key>FileLocation</key>
> <val>%2FUsers%2Frnguyen%2Fvpicu%2Fdata%2Farchive%2FMRN_1010209</val>
> 
> But the product reference doesn't:
> <reference dataStore="file:/Users/rnguyen/vpicu/data/archive/MRN_null/null" orig="file:///Users/rnguyen/vpicu/components/filemgr/policy/cerner/vps_demog.csv"
size="1114427"/>
> 
> Is this an issue? Or am I not using the components correctly? Is there a better way to
achieve what I want?
> 
> Thanks,
> Ricky
> 
> 
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Chris Mattmann, Ph.D.
Senior Computer Scientist
NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
Office: 171-266B, Mailstop: 171-246
Email: chris.a.mattmann@nasa.gov
WWW:   http://sunset.usc.edu/~mattmann/
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Adjunct Assistant Professor, Computer Science Department
University of Southern California, Los Angeles, CA 90089 USA
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


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