Subject: RE: [jade-develop] Agent creation error ???
From: BROUCHOUD Henri FTRD/DIH/LAN (henri.brouchoud@rd.francetelecom.com)
Date: Thu Oct 03 2002 - 12:24:00 MET DST
Humm ... I am not happy whith both solutions.
I think I have a better one (for Jade 2.61) :
I can call
agentContainer.getAgent(someName);
on the container before creating my agent, if this call succeeds, the agent name is
already used and I will have a name clash.
It solves only a name clash problem, if the agent creation failed for some other
reason, the error will not be reported to my code.
Thanks Fabio
Henri
> -----Message d'origine-----
> De : Bellifemine Fabio [mailto:Fabio.Bellifemine@TILAB.COM]
> Envoyé : mercredi 2 octobre 2002 15:52
> À : BROUCHOUD Henri FTRD/DIH/LAN; jade-develop@sharon.cselt.it
> Objet : RE: [jade-develop] Agent creation error ???
>
>
> Henri, the thread that executes the method acceptNewAgent is
> different from the thread that executes the actual creation
> of the agent and that throws the NameClashException.
> Therefore, it is quite difficult, even if not impossible, to
> report the exception to the caller. You might try to modify
> the code yourself and submit to use the modification.
>
> Otherwise, if the application needs to know if the agent
> creation succedded or not, then I think it is better you use
> the FIPA-REQUEST protocol and you request the AMS to create the agent.
>
> Ciao, Fabio.
>
> -----Original Message-----
> From: BROUCHOUD Henri FTRD/DIH/LAN
> [mailto:henri.brouchoud@rd.francetelecom.com]
> Sent: 01 October 2002 10:45
> To: jade-develop@sharon.cselt.it
> Subject: [jade-develop] Agent creation error ???
>
>
> Hi jaders,
>
> I have to implement an agent that is a factory for other
> agents. For conceptual reasons
> I have to instanciate the agent before starting it within Jade.
> The code I use to do that is the following :
>
> public class AgentFactory extends jade.core.Agent {
> ...
>
> MyAgent myAgent = new MyAgent(); // the class MyAgent
> extends jade.core.Agent
> myAgent._init(/* some stuff*/ );
>
> jade.wrapper.AgentContainer container =
> getContainerController();
> jade.wrapper.Agent ac =
> container.acceptNewAgent(someName, (jade.core.Agent) myAgent);
> ac.start();
>
> ...
>
>
> It works ok, except that if I create an agent with a name
> that is already in use within the platform, Jade writes a
> beautiful message on the stdout, but I have no way in my code
> to know if the agent creation succeeded or not. I expected at
> least to get an exception, or a null return value from
> acceptNewAgent/createNewAgent.
> Moreover, there exist a jade.core.NameClashException, it
> seems to me that it should be used for this. Am I wrong ?
> Is it the right way to create an agent ?
>
> Thanks in advance
>
> Henri
>
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