[omniORB] Locating OmniORB Services via Multicast

[Joe Bronkema]

I also assume the answer is "no", but you should be able to achieve 
something similar with some shell scripts and SLP.  SLP is the Service 
Location Protocol, and it uses multicast to discover services on the 
network.  OpenSLP is a free implementation, and comes with some command 
line tools you can use from scripts.  Check out http://www.srvloc.org

Thomas A. Moulton wrote:

>   Does omniORB provide the ability to locate services (e.g., Naming
> Service) using Multicast similar to how the TAO Naming Service can be
> located?  I assume the answer is NO due to the fact that I can find no
> written documentation on this; however, I thought I'd ask to be certain.
>  I found a posting (Dated OCT 1999) from the omniORB mailing list
> archive which states ...
>
> Duncan Grisby wrote:
> >/
> />/ On Monday 11 October, Jonathan Gallmeier wrote:
> />/
> />/ > This might be a silly question, but I have not seen any info 
> about this.
> />/ > Does omniORB
> />/ > support (UDP) IP multicast?
> />/
> />/ No it does not. For normal CORBA requests, multicast would not be
> />/ useful, since a CORBA request has a single target object. Multicast
> />/ could be useful for event or notification services which are layered
> />/ on top of CORBA, but we have no plans to support such things.
> />/
> />/ What in particular do you wish to achieve?/
>
> I was hoping things may have changed between now and then?  The
> following is an excerpt from
> http://www.cs.wustl.edu/~schmidt/ACE_wrappers/TAO/docs/INS.html 
> <http://www.cs.wustl.edu/%7Eschmidt/ACE_wrappers/TAO/docs/INS.html>
> describing how Multicast based service location is used in TAO, for
> reference.
>
> >
> >         How does |resolve_initial_references| work ?
> >
> > The following is the order of mechanisms checked by
> > |resolve_initial_references| for locating a service:
> >
> >    1. ORBInitRef
> >       
> <http://www.cs.wustl.edu/%7Eschmidt/ACE_wrappers/TAO/docs/INS.html#oir>
> >
> >    2. ORBDefaultInitRef
> >       
> <http://www.cs.wustl.edu/%7Eschmidt/ACE_wrappers/TAO/docs/INS.html#odir>
> >
> >    3. ORB Default Settings
> >    4. Multicast to Service
> >
> > TAO uses the ACE_Hash_Map_Manager to keep track of the ObjectID:IOR
> > mappings specified on the command-line. The IOR could be in |IOR|,
> > |iiop|, or |corbaloc| format. If the ORB fails to resolve the IOR
> > using the command-line parameters or the default settings, it uses UDP
> > multicast to resolve the service.
>
> Thanks,
>
> Tom Moulton
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