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List:       kde-devel
Subject:    Re: doubt about kioslave
From:       Albert Astals Cid <aacid () kde ! org>
Date:       2012-06-11 18:10:07
Message-ID: 18351139.v6Rx1EKCyv () xps
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El Dilluns, 11 de juny de 2012, a les 17:59:44, Luca Ferrari va escriure:
> Hi all,
> I'm making my first kioslave and I've got a doubt, as already posted
> here http://forum.kde.org/viewtopic.php?f=43&t=102547.
> My protocol has the lines:
> 
> [Protocol]
> exec=kio_rolefs
> protocol=rolefs
> 
> and my kdemain is as follows:
> 
> extern "C" int KDE_EXPORT kdemain( int argc, char **argv )
> {
>   kDebug(RoleFSDebugArea()) << "[kdemain] starting";
>   KComponentData instance( "kio_rolefs" );
> 
> 
> 
>   kDebug(RoleFSDebugArea()) << "kdemain is creating a slave...";
>   RoleFSKIOSlave slave( "Hello","Slave", instance, argv[2], argv[3] );
>   kDebug(RoleFSDebugArea()) << "staring the dispatch loop";
>   slave.dispatchLoop();
>   kDebug(RoleFSDebugArea()) << "kdemain] ending";
>   return 0;
> }
> 
> 
> So it should do nothing very special here. However, when I open
> dolphin (a single window) and point it to the rolefs:/// path I see in
> the ~/.xsession-errors log file the following messages:
> 
> unnamed app(9078)/[RoleFS debug] kdemain: [kdemain] starting
> kio_rolefs(9078)/[RoleFS debug] kdemain: kdemain is creating a slave...
> kio_rolefs(9078)/[RoleFS debug] kdemain: staring the dispatch loop
> unnamed app(9084)/[RoleFS debug] kdemain: [kdemain] starting
> kio_rolefs(9084)/[RoleFS debug] kdemain: kdemain is creating a slave...
> kio_rolefs(9084)/[RoleFS debug] kdemain: staring the dispatch loop
> unnamed app(9087)/[RoleFS debug] kdemain: [kdemain] starting
> kio_rolefs(9087)/[RoleFS debug] kdemain: kdemain is creating a slave...
> unnamed app(9088)/[RoleFS debug] kdemain: [kdemain] starting
> kio_rolefs(9088)/[RoleFS debug] kdemain: kdemain is creating a slave...
> kio_rolefs(9087)/[RoleFS debug] kdemain: staring the dispatch loop
> unnamed app(9089)/[RoleFS debug] kdemain: [kdemain] starting
> kio_rolefs(9089)/[RoleFS debug] kdemain: kdemain is creating a slave...
> kio_rolefs(9089)/[RoleFS debug] kdemain: staring the dispatch loop
> kio_rolefs(9088)/[RoleFS debug] kdemain: staring the dispatch loop
> unnamed app(9090)/[RoleFS debug] kdemain: [kdemain] starting
> kio_rolefs(9090)/[RoleFS debug] kdemain: kdemain is creating a slave...
> kio_rolefs(9090)/[RoleFS debug] kdemain: staring the dispatch loop
> 
> therefore there are processes 9078, 9084, 9087, 9088, 9089 and 9090
> for a total of 6 kioslaves running at the same time. The rolefs:///
> root path displays 3 icons, one of which contains 4 other elements.
> Besides this, I'd like to know when kioslave are created and how is it
> possible to handle a "shared" state so that if the user opens two file
> manager views the slaves are accessing the same underlying values
> (beside haveing to re-read the configuration).

kioslaves are by definition stateless, i.e. you can't assume anything about a 
running instance being reused or a new one being spawned, etc. If you need to 
keep state I think the common solution is to have a kded that the slave 
communicates with. Also having a maxInstances of 1 might help.

You can have a look at 
http://techbase.kde.org/Development/Tutorials/Debugging/Debugging_IOSlaves to 
learn how to debug your slave.

Cheers,
  Albert

> 
> Thanks,
> Luca
> 
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