Review Request 118869: Use QElapsedTimer for data engines

[Commit Hook]

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This review has been submitted with commit ac5d3d2f916c0a461121d4d033642227bd743edb by Christoph Feck to branch master.

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On June 23, 2014, 10:47 a.m., Christoph Feck wrote:
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> https://git.reviewboard.kde.org/r/118869/
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> (Updated June 23, 2014, 10:47 a.m.)
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> Review request for Plasma and Aaron J. Seigo.
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> Bugs: 336551
>     http://bugs.kde.org/show_bug.cgi?id=336551
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> Repository: kdelibs
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> Description
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> As described in bug 336551, plasma data engines use QTime to find out about elapsed time. The problem is that QTime handles time zones, and therefore reads /etc/localtime on each call.
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> Instead, it should use QElapsedTimer. This fixes both the performance issue, as well as the FIXME from the comment about not handled 24-h wraps and timezone changes.
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> There are probably more places where this can be changed.
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> Diffs
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>   plasma/datacontainer.cpp d19b1a5 
>   plasma/dataengine.cpp 9612574 
>   plasma/private/datacontainer_p.h a3e1f00 
>   plasma/private/dataengine_p.h 74a61e2 
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> Diff: https://git.reviewboard.kde.org/r/118869/diff/
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> Testing
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> Thanks,
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> Christoph Feck
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