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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:. _4 Z$ p$ P0 a6 P& f8 e
! v3 ^0 B( @1 A
public Object buildActions () {
3 V; w0 M0 B4 T+ V6 a2 |0 }    super.buildActions();
/ f' _, W+ @1 z   
: M7 I& f" r6 h+ d5 k    // Create the list of simulation actions. We put these in+ t% [( y* j6 J+ w7 |' |
    // an action group, because we want these actions to be4 d& f. ?. C/ ]2 ]2 y
    // executed in a specific order, but these steps should+ E& q8 s* \3 Z. I( ?
    // take no (simulated) time. The M(foo) means "The message
/ Z! M( [! y: M' {    // called <foo>". You can send a message To a particular. a8 ^; Z9 B0 f" o" V; r
    // object, or ForEach object in a collection.
' Z6 X9 s3 \: s" i2 d* j  j, u        ) P3 ?4 t& g, x0 r. N' i: K  o/ _
    // Note we update the heatspace in two phases: first run( @. {8 E/ z( K. K' t
    // diffusion, then run "updateWorld" to actually enact the/ [0 S6 B1 y& V0 p' f
    // changes the heatbugs have made. The ordering here is
& R! T, q' m  ^9 q$ e6 t    // significant!/ K. ?( A( z, W1 F5 v7 B( ~+ m
        $ V% c1 W9 t; \
    // Note also, that with the additional" x# \0 ]/ i. M- z6 R
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
2 H2 Y7 d4 t1 F% ~  s! P    // randomize the order in which the bugs actually run, t/ K2 W/ d& j5 E/ ^
    // their step rule.  This has the effect of removing any
; L2 k  c$ B4 ?4 a    // systematic bias in the iteration throught the heatbug9 O- Y" N7 Q. A1 u/ o
    // list from timestep to timestep
! F1 }, V7 {: u' g4 G5 g7 p  C        / {  P7 Q* o+ k4 C: d3 I8 ]/ @$ W; B
    // By default, all `createActionForEach' modelActions have' ]8 l9 v2 j  V
    // a default order of `Sequential', which means that the4 f' D$ u- M* D" b9 s
    // order of iteration through the `heatbugList' will be
( D" a/ N: O- e  \$ y    // identical (assuming the list order is not changed' _: q! @7 f0 D0 Y1 o4 b! b& {
    // indirectly by some other process).
5 ^' c  i8 k! B6 o   
8 T  n- \/ e  X    modelActions = new ActionGroupImpl (getZone ());, ]! k1 v! p; o  X) V) W3 q0 `. }' u

1 X$ t/ B8 g6 c$ H3 [( o! |    try {
- @% a0 X0 ^# z      modelActions.createActionTo$message, j, ]: m) W1 K1 |9 G1 m
        (heat, new Selector (heat.getClass (), "stepRule", false));
7 U3 |; c& Q! a! I4 |* T& k9 _    } catch (Exception e) {
+ K7 [9 o: ]" A0 f. m  |5 t. p5 |8 O      System.err.println ("Exception stepRule: " + e.getMessage ());+ z. h4 [# i8 p' x  b4 T! C
    }
; Q2 }/ W, c7 t! Q; E0 k! F( @, X9 _  j7 b
    try {2 g- }/ W0 a( t. t! s
      Heatbug proto = (Heatbug) heatbugList.get (0);7 l$ L6 b, k* J
      Selector sel =
2 i' L! ~5 A# f' U; y2 H        new Selector (proto.getClass (), "heatbugStep", false);0 i5 ?" O8 k" x# H
      actionForEach =' \% b7 d2 Q+ B/ d5 Z$ @
        modelActions.createFActionForEachHomogeneous$call
. q: y3 O& x9 S- `7 O  a* l' D        (heatbugList,: x& ?! F+ a* _6 W1 @
         new FCallImpl (this, proto, sel,
2 ]) f% z* W; R6 U                        new FArgumentsImpl (this, sel)));
0 k# g1 Q0 S$ f# a0 ]    } catch (Exception e) {
; E; X+ _- D: R( V. X      e.printStackTrace (System.err);
" u# A0 V& t- d* t2 J/ w    }6 v, C- f0 q0 p1 K5 @/ Z% w! k/ Z  r
   
1 V5 [" {/ G. z* X    syncUpdateOrder ();  S- G, h; M- P6 V0 o0 L& V1 A
) j( O4 a) f$ w8 o$ E+ l: p" i8 V
    try {
& H* k1 p0 K# H! C& f      modelActions.createActionTo$message
' v$ p, W0 J# ?) r8 o, Y: _& ~/ \) U1 g        (heat, new Selector (heat.getClass (), "updateLattice", false));
3 p. C3 a! B& y  q0 Z3 X; a    } catch (Exception e) {
9 E* ]8 V. t0 D; o      System.err.println("Exception updateLattice: " + e.getMessage ());
5 K& n. c2 s  a* ]( X    }+ S) A/ i4 J7 n4 G; z; i
        9 N6 Z6 F" y* v) k& L
    // Then we create a schedule that executes the1 s' }+ k3 {* K" M, y, U
    // modelActions. modelActions is an ActionGroup, by itself it, f! A1 D; G3 |) h/ @) h
    // has no notion of time. In order to have it executed in$ u6 ^9 q  M3 d
    // time, we create a Schedule that says to use the
& v0 \" n' {' y1 C- R    // modelActions ActionGroup at particular times.  This. `- T" a$ B% Z2 \! `
    // schedule has a repeat interval of 1, it will loop every
: V- ?7 l6 q+ M    // time step.  The action is executed at time 0 relative to* |( |+ B3 |8 s, O4 I
    // the beginning of the loop.  F- {. o" J% q9 B' t: m4 ^
  i: z* Z3 R4 W
    // This is a simple schedule, with only one action that is+ Q* H4 `9 I% f. D+ [" O' j
    // just repeated every time. See jmousetrap for more
+ i$ }% z" f8 O! V5 T    // complicated schedules.% f) N( |* b7 }
  
- a! P' b' _& Z# s    modelSchedule = new ScheduleImpl (getZone (), 1);
5 \' F0 G; s: Z* c- }4 s( Y' r    modelSchedule.at$createAction (0, modelActions);
/ o* Z8 l/ V" T8 l+ t, p        7 ^4 o$ s9 @0 ~4 T6 h4 A
    return this;( E2 l4 n& ?5 Q
  }
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