RE: new libbonobo API

[Murray Cumming Comneon com]

Sorry for the massive delay in replying.

This not entirely clear - I think there's some confusion between CORBA and
Bonobo stuff here.

But it doesn't look like something that's going to affect the C++ bindings.
I think we already aggregate the C servers via client references, to
implement new derived CORBA interfaces. It's probably a lot easier in C++
because we don't deal with those C CORBA epv thingies much in the higher
levels.

But I'm not really sure what I'm talking about.


Murray Cumming
murrayc usa net
www.murrayc.com 

> -----Original Message-----
> From: James Henstridge [mailto:james daa com au] 
> Sent: Mittwoch, 16. April 2003 08:09
> To: language-bindings gnome org
> Subject: new libbonobo API
> 
> 
> One of the python bindings hackers (Gustavo Carneiro) has 
> been working 
> on some new APIs that allow the aggregation of CORBA interfaces not 
> implemented in C into a Bonobo component.
> 
> This essentially allows you to wrap a BonoboObject around an object 
> reference (the servant will probably still need to be 
> implemented with 
> ORBit2 due to the difficulties of colocating two ORBs in a single 
> process though).  The new API looks like this:
>    BonoboObject* bonobo_foreign_object_new (CORBA_Object 
> corba_objref);
> 
> The idea is that the language binding user could implement 
> the interface 
> as usual for their language, activate the servant and create a 
> BonoboObject wrapper around the objref.  The Bonobo::Unknown methods 
> (ref, unref and queryInterface) of the interface would need to be 
> proxied to the BonoboObject wrapper so that those methods keep the 
> correct semantics (they would be proxied to bonobo_object_ref(), 
> bonobo_object_unref() and bonobo_object_local_query_interface() 
> respectively).
> 
> It looks like this simple interface will be enough for the Python 
> bindings to allow implementation of custom interfaces for 
> components.  
> It would be good to hear what other language binding authors 
> think (in 
> particular, LBs for C++ which are _very_ different to 
> Python).  Comments 
> would be appreciated on either this list or the bugzilla bug:
>     http://bugzilla.gnome.org/show_bug.cgi?id=109973
> 
> 
> As a bit of background, the reason for needing this interface is the 
> weird way Bonobo builds up the vepv ('vector of entry point vectors') 
> for servants.  You create a GObject subclass of the 
> interface, and store 
> the epv for the interface at the end of the class struct.  Interfaces 
> that derive from other interfaces correspond to GObject classes that 
> derive from other classes.  Bonobo has some helpers to gather 
> these epvs 
> into the final vepv, which covers over some of the more ugly parts of 
> the CORBA C mapping.  Unfortunately, this makes things very difficult 
> for language bindings that perform calls differently.
> 
> The above API allows you to create a BonoboObject instance without 
> having to deal with all the C convenience routines.
> 
> James.
> <mailto:gjc inescporto pt>
> 
> -- 
> Email: james daa com au
> WWW:   http://www.daa.com.au/~james/
> 
> 
> 
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