Review Request 127236: Leverage QDir to know what's in a KIconThemeDir

[Nick Shaforostoff]

> On March 1, 2016, 4:37 p.m., Aleix Pol Gonzalez wrote:
> > Eh... I just realized it's not 100% correct. We have a test (testUnknownIconNotCached) that fails, unsure how I didn't see it yesterday.
> > 
> > The problem with this one is that we are not reacting when icons are introduced at runtime. I tried adding a sneaky QFileSystemWatcher/KDirWatch on KIconTheme but it didn't signal.
> > 
> > Should I just discard the patch?
> 
> David Edmundson wrote:
>     Could you compare modified time of mBaseDirThemeDir and reload if needed?
>     it'd be one extra stat on the directory each time, but still a saving from before
> 
> Aleix Pol Gonzalez wrote:
>     That doesn't work, for some reason...
>     ```
>              // Install the existing icon by copying.
>     +        qDebug() << "xxxxxxxx1" << QFileInfo(actionIconsDir).lastModified();
>              QVERIFY(QFile::copy(QStringLiteral(":/test-22x22.png"), newIconPath));
>     +        qDebug() << "xxxxxxxx2" << QFileInfo(actionIconsDir).lastModified();
>     ```
>     
>     Both return the same value.
> 
> Nick Shaforostoff wrote:
>     there is a difference between changing a file from inside the program and changing it from outside.
>     
>     did you make the change externally when testing QFileSystemWatcher-based solution?

also for the QFileInfo::lastModified() there may be just not enough time between the tests, so try adding a 2-minute sleep there


- Nick


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On March 1, 2016, 3:25 a.m., Aleix Pol Gonzalez wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/127236/
> -----------------------------------------------------------
> 
> (Updated March 1, 2016, 3:25 a.m.)
> 
> 
> Review request for KDE Frameworks and Christoph Feck.
> 
> 
> Repository: kiconthemes
> 
> 
> Description
> -------
> 
> At the moment we're playing Battleship to see if an icon is present in a subdirectory. This means that we are checking on every directory if there's an icon that matches the size with a said name on every request.
> 
> This can be seen easily with strace:
> ```
> $ strace kwrite |& grep ENOENT | wc -l
> 6212
> ```
> After the patch: 
> ```
> $ strace kwrite |& grep ENOENT | wc -l
> 1993
> ```
> We reduce these accesses to let QDir keep the list of files inside the directory (that was already being generated at some point, it just was being discarded).
> 
> 
> Diffs
> -----
> 
>   src/kicontheme.cpp 0996054 
> 
> Diff: https://git.reviewboard.kde.org/r/127236/diff/
> 
> 
> Testing
> -------
> 
> Builds, tests still pass, applications start noticeably faster.
> 
> 
> Thanks,
> 
> Aleix Pol Gonzalez
> 
>

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