bonobo-context

bonobo-context — Extensible runtime service interface

Functions

Description

The bonobo-context code is designed to provide a way to expose CORBA contexts through a single C interface. This is so that language bindings can get away with wrapping a single function, and yet have access to the whole Bonobo service framework. Two examples of this are the MonikerContext and the RunningContext ( see Bonobo_Context.idl ).

Example 1. Getting and using the moniker context

1
2
3
4
5
6
7
8
Bonobo_MonikerContext context;
Bonobo_Unknown        object;
context = bonobo_context_get ("Activation", NULL);
if (context == CORBA_OBJECT_NIL)
    g_error (_("Internal error, no activation context"));
object = Bonobo_MonikerContext_getObject (
    "file:/demo/a.jpeg", "Bonobo/Control", ev);
...


The list of contexts is open and may be expanded in the future, currently there are the following:

  • Activation - Bonobo/MonikerContext

  • Running - Bonobo/RunningContext

The running context is particularly useful for ensuring that server processes exit cleanly when all their objects and derived objects are dead. To do this we can simply do the following:

Example 2. How to get a factory to quit when it is idle

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
static void
last_unref_exit_cb (gpointer      context,
            BonoboObject *factory)
{
        bonobo_object_unref (factory);
    gtk_main_quit ();
}
...
int main (int argc, char **argv)
{
    ...
    bonobo_running_context_ignore_object (BONOBO_OBJREF (object));
    gtk_signal_connect (GTK_OBJECT (bonobo_context_running_get ()),
                "last_unref", last_unref_exit_cb, factory);
    ...
    bonobo_main ();
}


Since this is a commonly used thing there is a helper to make this easier:

Example 3. How to get a factory to quit when it is idle


Functions

bonobo_context_get ()

Bonobo_Unknown
bonobo_context_get (const CORBA_char *context_name,
                    CORBA_Environment *opt_ev);

The most useful context is named 'Activation' and returns the IDL:Bonobo/ActivationContext:1.0 interface.

Parameters

context_name

the name of the context

 

opt_ev

optional Environment, or NULL

 

Returns

a new reference to a global Bonobo context or CORBA_OBJECT_NIL


bonobo_context_add ()

void
bonobo_context_add (const CORBA_char *context_name,
                    Bonobo_Unknown context);

This function adds a new context to the context system

Parameters

context_name

the name to refer to the context by

 

context

The Bonobo_Unknown; a ref. is taken on this.

 

bonobo_context_running_get ()

BonoboObject *
bonobo_context_running_get (void);


bonobo_running_context_auto_exit_unref ()

void
bonobo_running_context_auto_exit_unref
                               (BonoboObject *object);

Types and Values