Re: [certi-dev] NERA implementation

[Pierre Siron]

Bonjour,
If I well understand your Python code,
if you have 2 federates,
the 2 federates will call NERA.

Many federates can call NERA,
but one federate must call NER
so that the federation could continue.

This is my understanding of :
Richard Fujimoto, "Zero lookahead and repeatability in the High Level 
Architecture"
http://www.cc.gatech.edu/computing/pads/PAPERS/Zero_Lookahead_and_Repeatability.pdf

Bien cordialement,
Pierre



Le 04/02/2013 17:01, Usman Awais a écrit :
> Hi,
>
> I am trying to use NERA in combination with NER, as suggested in the 
> reference. A single federate works fine but more than one federates 
> make the application hanged. In fact neither of the federates are 
> granted with the time slice, so both of them hang. Here is the python 
> code of the relevant section
>
> def main (name, timeStep):
>     print("Create ambassador")
>     rtia = rti.RTIAmbassador()
>     print(rtia)
>     fedAmb = FederateAmb()
>     fedAmb.initialize(rtia)
>     try:
>
>         rtia.createFederationExecution("Test", "Test.xml")
>         fedAmb.creator = True
>         print("Federation created.")
>     except Exception , e:
>         print("Federation exists: %s" % repr(e))
>     finally:
>         print ('Federation done.')
>
>     try:
>         rtia.joinFederationExecution(name, "Test", fedAmb)
>         fedAmb.enableTimeSwitches(0.0)
>         fedAmb.publish()
>         fedAmb.subscribe()
>         fedAmb.waitReadyToPopulate()
>         fedAmb.registerInstance(name)
>         fedAmb.waitReadyToRun()
>         T_INCR = timeStep
>         pt = 0
>         while fedAmb.time < 500:
>             pt = pt + T_INCR
>             print('requested time : '+repr(pt))
>             rtia.nextEventRequestAvailable(pt)
>             while 1:
>                 if fedAmb.granted==False:
>                     rtia.tick()
>                 else:
>                     fedAmb.granted=False
>                     break
>             print('grnated time : '+ repr(fedAmb.time))
>             fedAmb.X += 1
>             fedAmb.Y += 1
>
>             fedAmb.updateAttributes()
>             rtia.nextEventRequest(fedAmb.time)
>
>             while 1:
>                 if fedAmb.granted==False:
>                     rtia.tick()
>                 else:
>                     fedAmb.granted=False
>                     break
>     except Exception, e:
>         print("Could not do, exception: %s" % repr(e))
>
>     finally:
>         try:
>             fedAmb.terminate()
>         except Exception, e:
>             print("Could not do, exception: %s" % repr(e))
>         try:
>             
> rtia.resignFederationExecution(rti.ResignAction.DeleteObjectsAndReleaseAttributes)
>         except Exception, e:
>             print("Could not do, exception: %s" % repr(e))
>
>         try:
>             rtia.destroyFederationExecution('Test')
>         except Exception, e:
>             print("Could not do, exception: %s" % repr(e))
>
>         print("Done.")
>
>
> Regards,
> Muhammad Usman Awais