[Nepomuk] Review Request: New GraphMaintainer class which removes empty graphs

[Vishesh Handa]

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nepomuk/services/storage/graphmaintainer.cpp
<http://git.reviewboard.kde.org/r/102214/#comment4936>

    Or 
    
    select ?g ?mg where { ?g a nrl:InstanceBase . OPTIONAL { ?mg nrl:CoreGraphMetadataFor ?g . graph ?g { ?r ?p ?o. } } FILTER(!bound(?r) || !bound(?p) || !bound(?o)) . } LIMIT 100
    
    This seems to be faster, but just by around 10-20 milliseconds. It's difficult to determine which query is faster.


- Vishesh


On Aug. 4, 2011, 2:43 p.m., Sebastian Trueg wrote:
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> (Updated Aug. 4, 2011, 2:43 p.m.)
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> Review request for Nepomuk.
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> Summary
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> The new GraphMaintainer is created at startup and will slowly remove empty graphs which are left over from the pre-DMS days. It uses a delay between each removal operation to not impose on the user's work at all. Thus, it takes forever to remove the graphs but that is no big deal.
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> Diffs
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>   nepomuk/services/storage/CMakeLists.txt 75f6fd8 
>   nepomuk/services/storage/graphmaintainer.h PRE-CREATION 
>   nepomuk/services/storage/graphmaintainer.cpp PRE-CREATION 
>   nepomuk/services/storage/repository.cpp ce0d385 
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> Diff: http://git.reviewboard.kde.org/r/102214/diff
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> Testing
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> Tested manually: all empty graphs removed.
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> Thanks,
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> Sebastian
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>

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