问jheatbugs-2001-03-28中某些代码

sybbk · 发表于 2008-5-25 02:15:22

HeatbugModelSwarm中buildActions部分，3个try分别是做什么？查了下refbook-java-2.2，解释太简略，还是不懂，高手指点，谢谢！代码如下：

public Object buildActions () {
super.buildActions();

// Create the list of simulation actions. We put these in
// an action group, because we want these actions to be
// executed in a specific order, but these steps should
// take no (simulated) time. The M(foo) means "The message
// called <foo>". You can send a message To a particular
// object, or ForEach object in a collection.

// Note we update the heatspace in two phases: first run
// diffusion, then run "updateWorld" to actually enact the
// changes the heatbugs have made. The ordering here is
// significant!

// Note also, that with the additional
// `randomizeHeatbugUpdateOrder' Boolean flag we can
// randomize the order in which the bugs actually run
// their step rule.  This has the effect of removing any
// systematic bias in the iteration throught the heatbug
// list from timestep to timestep

// By default, all `createActionForEach' modelActions have
// a default order of `Sequential', which means that the
// order of iteration through the `heatbugList' will be
// identical (assuming the list order is not changed
// indirectly by some other process).

modelActions = new ActionGroupImpl (getZone ());

try {
   modelActions.createActionTo$message
      (heat, new Selector (heat.getClass (), "stepRule", false));
} catch (Exception e) {
   System.err.println ("Exception stepRule: " + e.getMessage ());
}

try {
   Heatbug proto = (Heatbug) heatbugList.get (0);
   Selector sel =
      new Selector (proto.getClass (), "heatbugStep", false);
   actionForEach =
      modelActions.createFActionForEachHomogeneous$call
      (heatbugList,
      new FCallImpl (this, proto, sel,
                     new FArgumentsImpl (this, sel)));
} catch (Exception e) {
   e.printStackTrace (System.err);
}

syncUpdateOrder ();

try {
   modelActions.createActionTo$message
      (heat, new Selector (heat.getClass (), "updateLattice", false));
} catch (Exception e) {
   System.err.println("Exception updateLattice: " + e.getMessage ());
}

// Then we create a schedule that executes the
// modelActions. modelActions is an ActionGroup, by itself it
// has no notion of time. In order to have it executed in
// time, we create a Schedule that says to use the
// modelActions ActionGroup at particular times.  This
// schedule has a repeat interval of 1, it will loop every
// time step.  The action is executed at time 0 relative to
// the beginning of the loop.

// This is a simple schedule, with only one action that is
// just repeated every time. See jmousetrap for more
// complicated schedules.

modelSchedule = new ScheduleImpl (getZone (), 1);
modelSchedule.at$createAction (0, modelActions);

return this;
  }

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[求助] 问jheatbugs-2001-03-28中某些代码