Re: ordering events in a swarm ....

[xueyue]

Dear All, 
I would like to further clarify the problem which I presented 
earlier. I think Schedule class definition coming from Swarm
should allow event to be scheduled in random order.

(1) tm is current time, schedulerSwarm is a Swarm object of class
SchedulerSwarm, in which buildActions has an object schedule:
-buildActions {
....
schedule=[Schedule create: self];
[schedule setAutoDrop: 1];
...
}

and 
-newScheduleAt: (timeval_t) t target: (id) tg message: (SEL) msg {
        [schedule at: t createActionTo: target message: msg];
        return self;
}

(2) I tested:

(2a)     [schedulerSwarm newScheduleAt: tm+5 target: tgA message:
M(testA)];

will work;

(2b) [schedulerSwarm newScheduleAt: tm+5 target: tgB message: M(testB)];

will work;

(2c) [schedulerSwarm newScheduleAt: tm+5 target: tgA message: 
M(testA)];
[schedulerSwarm newScheduleAt: tm+5+dt target: tgB message: M(testB)];
will work (dt>=0);
BUT, WILL NOT WORK if (dt < 0);

So, this is unlikely, there is any coding problem in my programme. I
think Schedule class can only schedule events
in their order of excuting. In other words, it seems in Schedule class
there is a queue Q of events:
Q=[e1(t1), e2(t2), ..., en(tn)]; (ti > t(i-1));
where ei is an event, ti is the time at which the event will 
be excuted. Now, if there is event e(t), if t>=tn, then 
it can be scheduled (inserted into Q), otherwise it can not 
scheduled by schedule. If this is the case, Schedule class 
will have its disadvantage.

Before I tested my programme, I always assume Schedule allows
random scheduling, but it doesn't. I need the function, can 
anyone suggest a solution?

Many thanks!

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