How can I know if a server is not reachable

Hi,
    I have working an master app sending messages to several apps which are listening
 
My problem is that if an listener app is not reachable because a net problem or other problem the call to that app never ends o it is very long and the master app becomes to store pending messages and finally it goes to an Out of Memory
 
The master  gets the reference to the listener throw a CORBA call,  listeners send a reference of a CORBA server to the master 
     e.g. :


interface iListener {
    void addMsg( in string msg );
}
 

interface iMaster {
    void addListener( in iListener listener );
}

            master.addListener( xxxxx ) ;
            where xxxxx is a server  of class iListener
 
Is there any method to know if that reference is active or reachable ?
 
A method to round the problem could be set a TimeOut to the object, I know how to put TimeOuts on servers and on clients generated from 
orb.string_to_object("corbaloc......."), but I don't know doit on Objects got from a call like the previous addListener(...) 
 
Thanks
 
 
Gerardo González Muñoz 
Transportes y Tráfico 

 

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