Review Request: Improve SqlMeta thread safety

[Ralf Engels]

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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/100098/
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(Updated 2010-10-25 16:55:56.808491)


Review request for Amarok.


Changes
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New version:
without WeakPointer changes
with additional protection agains null pointers
with fix for the reported lock problem


Summary
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This patch improves the SqlMeta thread safety.
It has several parts:
- Use QReadWriteLock for SqlTrack.
 For this I also needed to pull the read accessor functions into the .cpp
- SqlCollection is a const pointer.
 All metas are directly dependent on the SqlCollection and it could and should never change.
 Using weak pointers here is not needed.
 Note that now the access to m_collection is also thread safe as it's const
- SqlAlbum::setCompilation did modify the old album
 This was changed an a new album will be created.
 The positive side effect is that the UI will now update directly if setting a compilation
- SqlAlbum::setImage will now copy embedded images directly when set
 If the track-uid is set (maybe from another thread) the cover image will still be found.
 Note that the image cache is and was not connected to the track uid.


This addresses bug 254631.
    https://bugs.kde.org/show_bug.cgi?id=254631


Diffs (updated)
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  src/core-impl/collections/sqlcollection/SqlCollection.cpp b88d257 
  src/core-impl/collections/sqlcollection/SqlMeta.h b92e351 
  src/core-impl/collections/sqlcollection/SqlMeta.cpp 6b29b6e 
  src/core-impl/collections/sqlcollection/SqlRegistry.h 66ba632 
  src/core-impl/collections/sqlcollection/SqlRegistry.cpp e1b3571 

Diff: http://git.reviewboard.kde.org/r/100098/diff


Testing
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setting and unsetting compilation
changing album name
scanning and fully scanning collection


Thanks,

Ralf

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