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List:       kde-core-devel
Subject:    Re: Review Request: Provide (mostly) automatic synchronization between
From:       "Thomas Friedrichsmeier" <thomas.friedrichsmeier () ruhr-uni-bochum ! de>
Date:       2009-08-14 12:11:06
Message-ID: 20090814121106.10278.30589 () localhost
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> On 2009-08-14 08:04:33, Nick Shaforostoff wrote:
> > in case of several instances inside same process: am i right in that all the data \
> > is duplicated between all the instances? (if yes, why not store the data only \
> > once...)

Yes, but "all the data" in this case is one entry in the QString->KActionCollection* \
hash and one connected slot per instance (lines 72 and 73 of the patch). So that is \
little more than simply keeping track of all similar instances.

It is true, that each instance of the same KXMLGUIClient keeps a separate copy of the \
XML document. It might be possible to improve this, but such optimization should \
likely happen in KXMLGUIClient itself (and may not be quite trivial). This patch does \
not change anything in that respect.

One potential optimization in this patch would be to tell only one client to reload \
the XML, then pass the domDocument() using setDOMDocument(). In the case of many \
instances of the same KXMLGUIClient, this could save quite a few cylces looking up, \
parsing, and merging the XML files, though I'm not sure this would really matter in \
practice (keep in mind that these reloads happen after user-interaction, only). This \
would have the side effect of saving some memory via implicit sharing of the \
QDomDocument (*after* reloading, only). But again, if we are to do this sort of \
optimization, I believe it should go into KXMLGUIClient, directly.

Yet another potential optimization would be to limit rebuildGUIs() to really refresh \
the action properties and toolbars, only, not the complete gui. If anybody knows, \
just how to do that, that would probably be a good idea (and such functionality \
should be added to KXMLGUIFactory).


- Thomas


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http://reviewboard.kde.org/r/1238/#review2023
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On 2009-08-11 12:19:00, Thomas Friedrichsmeier wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://reviewboard.kde.org/r/1238/
> -----------------------------------------------------------
> 
> (Updated 2009-08-11 12:19:00)
> 
> 
> Review request for Kate and kdelibs.
> 
> 
> Summary
> -------
> 
> First to sum up the problem, I'm trying to solve. I'll use konqueror as an example:
> 1) Fire up two instances of konqueror. In one of the instances, set the shortcut of \
> "Show History" to "Shift+F6". Now switch to the other instance: The change has not \
> been propagated. Ok, perhaps you did not expect that to work in the first place, \
> but now: 2) Fire up a single instance of konqueror, the open a new window \
> (File->New Window). Do the same game as in 1. The change is not propagated between \
> the two toplevel windows of the same konqueror instance, either. Finally: 3) Fire \
> up a single instance of konqueror, with a single toplevel window. Open a second tab \
> inside this window. Navigate both tabs to e.g. http://www.kde.org. Switch to tab A. \
> Change the shortcut of "View Document Source" to "Shift+F6". Take a look at the \
> "View"-menu to see the new shortcut. Now switch to tab B. Take another look at the \
> "View"-menu. The shortcut is still at the previous setting, here. Switch back to \
> tab A. The shortcut is back to the previous setting as well. 4) If you like to, \
> play games 1-3 with modifying the toolbars, instead of shortcuts. 
> So much for the bug description. Konqueror is not really to blame, here, and \
> neither is it the only application to be affected. The problem is that we're \
> missing a mechanism to synchronize user settings between separate instances of \
> KXMLGUIClients. That's what the new class KXmlGuiClientSyncer - contained in this \
> patch - does. See the API-documentation within for usage details. For the "essence" \
> of the code, see KXmlGuiClientSyncerPrivate::uiRcFileChanged(). 
> Some points, I wasn't sure about:
> 1) Originally, I tried to incorporate this into KXMLGUIClient, directly (or rather \
> KXMLGUIClientPrivate). That would have allowed for *fully* automatic \
> synchronization, i.e. without having to register/watch the clients manually. \
> However, kio depends on kdeui, and this would have added a cyclic dependency back \
> to kio. Any idea on how to work around this? Or this semi-automatic solution safer \
> in the first place? 2) I placed this inside kio, pretty much for the reason above. \
> Is this appropriate? 3) Which kDebug area to use?
> 
> 
> Diffs
> -----
> 
> trunk/KDE/kdelibs/includes/CMakeLists.txt 1006783 
> trunk/KDE/kdelibs/includes/KXmlGuiClientSyncer PRE-CREATION 
> trunk/KDE/kdelibs/kdeui/xmlgui/kxmlguiclient.h 1009993 
> trunk/KDE/kdelibs/kio/CMakeLists.txt 1006783 
> trunk/KDE/kdelibs/kio/kio/kxmlguiclientsyncer.h PRE-CREATION 
> trunk/KDE/kdelibs/kio/kio/kxmlguiclientsyncer.cpp PRE-CREATION 
> trunk/KDE/kdelibs/kio/kio/kxmlguiclientsyncer_p.h PRE-CREATION 
> 
> Diff: http://reviewboard.kde.org/r/1238/diff
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Thomas
> 
> 


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