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List:       kde-core-devel
Subject:    Re: Future of DCOP
From:       Matthias Ettrich <ettrich () trolltech ! com>
Date:       2001-03-26 14:30:55
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On Monday 26 March 2001 16:18, Stefan Westerfeld wrote:
[anip]
> > The only technical problem I see right now is for the
> > DCOPServer to safely detect when a client goes down. I hope this is
> > solvable, if not by adding something to ORBit. I haven't checked this
> > yet.
>
> MCOP has distributed reference couting for this. All objects need to be
> referenced to be used. MCOP removes the references to objects once a client
> dies (it can detect this easily, as the socket will produce an error,
> then).
>
> CORBA by definition doesn't allow you to solve it that way, because it
> allows clients to dynamically build up the TCP connection as needed. But
> well, there might be a workaround (which then might not be CORBA standard,
> but if it works).

I'm aware of the fact that standard CORBA cannot do that. So it boils down 
whether our friends at Gnome have a solution for this ( I mean, they must 
solve it _somehow_). Currently I don't even know whether ORBit uses persitent 
connections or closes them after some timeout.

For DCOP semantics we definitely need a way to reliably detect when a client 
dissappears, even with kill -9. A workaround would be to open another socket 
connection to the dcopserver just for the sake of watching it.


Matthias

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