Relay - Blackboard Economics

[Dimitrios Traskas]

Thanks Todd,

I opened the PingSender and PingReceiver files again and noticed the line
that removes the relay. I must say the information I needed was there but
didn't see it in the first place. Good thing you mentioned that the
publishRemove has to take place from the relay originator.


Cheers
Dimitris




On 26/03/2008, Todd Wright <twright at bbn.com> wrote:
>
>
> Plugins must use publishRemove to cleanup publishAdd'ed objects.
>
> The ping demo uses the following pattern:
>    1. The "PingSender" publishAdd's a new relay
>    2. The "PingReceiver" publishChange's the relay to send back a response
>    3. The "PingSender" publishRemove's its relay
>    4. goto (1)
> So, every ping iteration creates a new relay and removes it.  We cleanup
> after
> every iteration.  Note that the relay must be publishRemove'd on the agent
> where it was publishAdd'ed.
>
> Another common pattern is:
>    1. The sender publishAdd's a new relay "r1"
>    2. The receiver publishAdd's its response in a new relay "r2"
>    3. The sender publishChange's relay "r1" in response to "r2"
>    4. The receiver publishChange's relay "r2" in response to "r1"
>    5. goto (3)
> In this pattern the two relays, "r1" and "r2", acts as content "channels".
> There is no memory leak because we only publishAdd these two relays.
>
> There are advantages and disadvantages to both of these design patterns.
> Either works fine in practice.
>
> Todd
>
>
> Dimitrios Traskas wrote:
> > Hi to all,
> >
> > I have a question in regards with Relays and objects in the Blackboard.
> > If an Agent A has an established communication with an Agent B and they
> > send to each other a number of messages what happens with messages that
> > have been read and processed? Are they "garbage" collected or is it the
> > responsibility of client code to get rid of them? I have thousand of
> > messages being sent between Agents and I am wondering what happens once
> > I go through a normal execute routine where I check the added messages
> > in a collection. Once I read the message what is the lifetime of that
> > message?
> >
> >
> > Cheers
> > Dimitris
> >
> >
>
> > ------------------------------------------------------------------------
> >
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