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[求助] 问jheatbugs-2001-03-28中某些代码

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发表于 2008-5-25 02:15:22 | 显示全部楼层 |阅读模式
5仿真币
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:" f5 I  H4 t# K8 Y$ B( u
& p( [8 j6 H/ b
public Object buildActions () {
2 v( z1 d6 U' d0 s* j. j% L: ]    super.buildActions();
2 |* o: o' z" |- q7 h    # l8 n& q5 a& E
    // Create the list of simulation actions. We put these in
6 a/ G; X* g' Z. y$ H    // an action group, because we want these actions to be
* k: Z4 J# B  s- T# @, d+ ?" h/ Z    // executed in a specific order, but these steps should/ _4 e( I) ?) i) ^* Y9 v. N
    // take no (simulated) time. The M(foo) means "The message
0 S- n6 J  V, s/ |    // called <foo>". You can send a message To a particular' {$ U0 o8 s2 N9 H' q+ i
    // object, or ForEach object in a collection.
  Q6 m" |2 J, Q, T) F        5 U& E5 V1 g0 G! b
    // Note we update the heatspace in two phases: first run
( A( c3 y/ v4 U" \    // diffusion, then run "updateWorld" to actually enact the
7 R0 J" I  P/ e9 h, r- z8 F5 O, I' e! C    // changes the heatbugs have made. The ordering here is
0 _; g* h9 T$ ?/ z, p; @  f    // significant!" l( b' E8 o1 c0 |' U7 v, H3 E  z
        
0 `+ x' k) M6 m  @    // Note also, that with the additional
6 k- e3 x5 S1 i1 x4 c5 i    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# u; Y5 [& I: k$ N& [: U0 J: B    // randomize the order in which the bugs actually run, Z% p# s5 j# I9 J7 i+ z" n
    // their step rule.  This has the effect of removing any
- X; Y# s# ]+ A: |  V    // systematic bias in the iteration throught the heatbug' u5 f( ?1 ^/ k$ K0 W' r
    // list from timestep to timestep# p! v9 V5 y- D7 ^% K) O
        
6 Q  s) x6 V" ~6 X3 Y    // By default, all `createActionForEach' modelActions have
3 h+ v3 z5 S/ Z: O) W2 Y' T    // a default order of `Sequential', which means that the
4 k' i" l: p- a. ^- r! J0 [    // order of iteration through the `heatbugList' will be+ R8 y# b7 W' [1 a7 N
    // identical (assuming the list order is not changed
* P. G2 G" G7 f. T9 F, p1 B    // indirectly by some other process).6 x- k: ?7 ?! @; y2 [
    & f. ~. v6 M# }- |
    modelActions = new ActionGroupImpl (getZone ());
) q2 ]- i: f4 s, n1 F5 a$ k- j; `0 m
    try {
$ f% k  X5 R9 q      modelActions.createActionTo$message8 N( F& g4 F; k5 p; K0 z# g
        (heat, new Selector (heat.getClass (), "stepRule", false));9 Z  K/ t' Q# ?6 f: W  Q4 P
    } catch (Exception e) {" k* a3 X- Q" W9 o# X  M
      System.err.println ("Exception stepRule: " + e.getMessage ());: q7 b" F" n; N* \; D
    }
2 k: G* b; H% p; Q1 _9 i9 d$ X) U' @" a7 w- c: J& S4 }. U
    try {, ~& F! T0 E& J, Q! t8 X' L
      Heatbug proto = (Heatbug) heatbugList.get (0);
3 ~& I9 Y  f8 y! p1 t8 N      Selector sel = 5 `/ N# a$ |6 h# t
        new Selector (proto.getClass (), "heatbugStep", false);9 F' H9 A% p! J6 n
      actionForEach =; ?' p3 t. y5 Y% _  @) j
        modelActions.createFActionForEachHomogeneous$call
! E3 @+ f) {& j+ c) y7 K3 x        (heatbugList,( g0 ~8 z& g$ X* z. d$ M2 |) t
         new FCallImpl (this, proto, sel,: `# f* i$ ?( V
                        new FArgumentsImpl (this, sel)));0 @9 Z( L+ ~  e
    } catch (Exception e) {
' s4 z3 a& k' L* m, {# B      e.printStackTrace (System.err);
4 y( R' y0 l/ l, N    }& k% j+ @0 }6 ^9 W* l
    # J4 b- U: |7 p) u: Z/ t' E
    syncUpdateOrder ();
* `- R) P! l0 g: F
$ ~. K1 V6 ~# O- b. j) _    try {9 r% j& o* D$ A+ W7 Y3 G2 G
      modelActions.createActionTo$message 0 c" ]1 y/ I( f# E2 f
        (heat, new Selector (heat.getClass (), "updateLattice", false));7 ?: U: |3 e; I8 |# M
    } catch (Exception e) {7 V- O1 k: E/ _, f$ U2 L
      System.err.println("Exception updateLattice: " + e.getMessage ());3 m+ E) S* m7 E% {5 M
    }) ]1 S+ j0 x5 [4 ]" u$ v
        + b7 m  I) J7 d0 |+ K
    // Then we create a schedule that executes the
9 \. @+ z9 j" I! h6 f+ x    // modelActions. modelActions is an ActionGroup, by itself it5 i( w; u7 g2 p
    // has no notion of time. In order to have it executed in* P5 w  }/ x+ X6 r5 a! ?! g
    // time, we create a Schedule that says to use the
/ a/ a0 c3 h6 L: ^5 z7 J    // modelActions ActionGroup at particular times.  This
2 d( i/ L  Y2 i* k    // schedule has a repeat interval of 1, it will loop every
6 Y% B7 q: C9 x    // time step.  The action is executed at time 0 relative to( N1 A* i0 B1 F) Y
    // the beginning of the loop.
8 g' H1 A' J7 e% s1 s
- G1 C& B8 J* [    // This is a simple schedule, with only one action that is
% k; k9 T" x' x. Z    // just repeated every time. See jmousetrap for more: M) J2 @! B2 {
    // complicated schedules., y" o; m) j# h4 b
  ( I6 X9 }$ G" g) w" l
    modelSchedule = new ScheduleImpl (getZone (), 1);
% C" x% E0 U  a! U8 f: p, e$ z    modelSchedule.at$createAction (0, modelActions);
6 t. u2 e( ~9 f+ a$ }        
( c4 ~' j( A+ G    return this;
9 T+ d/ W8 V! x7 `1 H0 h  }
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