[omniORB] How to handle making copies of CORBA object.

[Mark Johnson]

Ok, I think I got this figured out.  It was correct for Event to be a struct
since this is just a data package that is being passed around.  My confusion
was that I was treating it as a distributed object which doesn't make sense
to do so here.  This is the reason why when the caller exited the reciever
core dumped since I was treating the Event as a distributed object and the
servant had exiting - consequently making the Event "service" unavailable...

> -----Original Message-----
> From: Mark Johnson 
> Sent: Thursday, August 30, 2001 9:01 AM
> To: OmniOrb Mailing List (E-mail)
> Subject: [omniORB] How to handle making copies of CORBA object.
> 
> 
> I have defined two interfaces Event and Controller.  The 
> Controller has a
> method called EventNotify( Event_ptr ).  In that method, I 
> create a thread
> to process the event, but I need to make a copy of the event since the
> sender might no longer be available after sending the event.  
> 
> I tried dong the following:
>    void Controller_i::EventNotify( Event_ptr aEvent )
>    {
>       omni_thread::create( theThreadFunc, 
> (void*)Event::duplicate(aEvent),
> omni_thread::PRIORITY_HIGH );
>    }
> But if the caller of controller->EventNotify() runs its 
> course and exits,
> the callee will core dump.  
> 
> 
> However, if I change Event to a struct and new the event 
> everything works
> great event if the caller exits:
>    void Controller_i::EventNotify( const Event& aEvent )
>    {
>       Event * event = new Event;
>       CopyEvent( event, aEvent );
>       omni_thread::create( theThreadFunc, (void*)event,
> omni_thread::PRIORITY_HIGH );
>    }
> 
> Which is the correct way of doing this.  Is it possible to 
> create a copy of
> the Event interface such that when the servant exits the 
> objects recieved at
> the client are still valid?  I would expect that I should 
> have to use an
> Event_var to take advantage of the reference counting, but 
> the idl compiler
> generated an Event_ptr for EventNotify().  I'm sure that 
> somewhere between
> the invokation of EventNotify() and the spawning of the 
> thread I need to
> create an Event_var but I don't understand the process of how 
> to do that.
> 
> thanks for your help....
>