Review Request: Stop DataContainer from discarding multiple values for a single key.

[Marco Martin]

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this actually causes a memory escalation

not actually a "leak" but in systemmonitor for instance each time a new value arrives, will have a different one
so the values will continue to pile up more and more

- Marco


On 2010-06-05 00:08:34, John Layt wrote:
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> (Updated 2010-06-05 00:08:34)
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> 
> Review request for Plasma.
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> Summary
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> If a DataEngine implementation uses QHash::insertMulti() to try return multiple values for a key, the DataContainer discards the multiple values and only returns a single value to the client.
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> A simplified example showing where 2 holidays occurring on the same date need to be treated as separate data entities:
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>         Plasma::DataEngine::Data holidays;
>         holidays.insertMulti("2010-06-01", "A national public holiday");
>         holidays.insertMulti("2010-06-01", "A minor religious holiday");
>         setData(request, holidays);
> 
> What gets returned to the client is only the second value for the minor religious holiday, so the public holiday doesn't appear on the calendar.
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> This is because the call to setData() loops through each value in the passed in DataEngine::Data and calls DataContainer::setData(), which inserts each value into a new DataEngine::Data, in the process discarding any previous multiple values.
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> This patch uses insertMulti() in the DataContainer::setData() to fix this.  I can't think of anything this would break by changing the behaviour to retain any multiples, they can only get there in the first place by the DataEngine explicitly calling insertMulti() so I think it's safe to assume the coder wants them kept.
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> The alternative would be to create new DataEngine::setMultiData() and DataContainer::setMultiData() methods.
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> 
> Diffs
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>   /trunk/KDE/kdelibs/plasma/datacontainer.cpp 1134380 
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> Diff: http://reviewboard.kde.org/r/4235/diff
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> Testing
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> Without the patch, holidays disappear between the calendar data engine and the calendar plasmoid.  With the patch all the holidays make it and can be treated differently according to type.
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> Thanks,
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> John
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>