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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:
. X/ B, P/ D  P: u9 `. g* S* O+ A0 l0 a, m
public Object buildActions () {
; `; E9 o2 L6 Z3 K    super.buildActions();& U, q1 a  U# U% t$ L1 g: |1 ]; q
   
- H- F7 I* Y; \4 z! z  T7 N- E    // Create the list of simulation actions. We put these in
, F# E. A. R# j" A" U% N3 a    // an action group, because we want these actions to be  J4 ]8 ^; |7 l& f) {% B
    // executed in a specific order, but these steps should
* Q6 Q/ K) [# N    // take no (simulated) time. The M(foo) means "The message
* e2 h+ ~( E+ J# E  Y    // called <foo>". You can send a message To a particular, {4 W7 |  f* d
    // object, or ForEach object in a collection.& C$ D4 g& S8 l% t! a: {5 b- Z
        
, p/ O# n% X8 J9 L- H    // Note we update the heatspace in two phases: first run
$ R' y) G6 z- X, b4 K# y    // diffusion, then run "updateWorld" to actually enact the- w, _6 l1 e3 X- a% u- d' x
    // changes the heatbugs have made. The ordering here is
% N; Z/ Z; b: m8 F; A% K    // significant!, ?$ N1 v% w7 e% |! i5 o
        
% d4 G! {8 l! p0 ^; L) p# n    // Note also, that with the additional
. u8 f. F+ B) W9 b1 P2 A; Y. m    // `randomizeHeatbugUpdateOrder' Boolean flag we can
- e) q2 J/ \; E    // randomize the order in which the bugs actually run
  p0 f0 X6 Q# g' }7 e% p+ ~, v    // their step rule.  This has the effect of removing any4 v* _$ ~- q, c" `! _! C6 `  J
    // systematic bias in the iteration throught the heatbug6 w, P! K7 ~' E
    // list from timestep to timestep4 x8 {8 ]* V& {9 U* H
        2 k0 S# C1 N0 P, K9 `
    // By default, all `createActionForEach' modelActions have8 W1 w! x# g& y3 c- b* V
    // a default order of `Sequential', which means that the
' c' H$ c' p  J" t) \    // order of iteration through the `heatbugList' will be' G5 e4 y- O# H6 u" `6 M
    // identical (assuming the list order is not changed
# K, J4 e' j( q    // indirectly by some other process).$ l% x6 A/ V  p7 T, e; I
    1 c0 b' Z, \  w, U
    modelActions = new ActionGroupImpl (getZone ());6 k: W8 W6 V0 }
9 O* q& z4 b: t7 |; z6 r
    try {
4 O; ^5 I# \8 s6 E7 A      modelActions.createActionTo$message
& ^; L. k- ~# }8 L. ^+ ]        (heat, new Selector (heat.getClass (), "stepRule", false));* x  i9 J$ B  ]0 Y7 V$ y6 L
    } catch (Exception e) {8 q6 b) }, m5 K& x: h
      System.err.println ("Exception stepRule: " + e.getMessage ());5 F& k6 U' ^' F
    }
3 h3 m# T/ ~  N0 ?5 U; u/ U; W, ~  M- m& p6 n% T* x5 S1 S4 H/ d
    try {3 V; v# f! n. S* c
      Heatbug proto = (Heatbug) heatbugList.get (0);; a0 X% n- N/ n% B1 H/ N7 W, S
      Selector sel = + ]4 z8 E2 \8 M/ p, ~' g+ A
        new Selector (proto.getClass (), "heatbugStep", false);
: r9 N1 C2 E" x      actionForEach =
/ g4 Z1 t$ c. E% @. M1 h6 w        modelActions.createFActionForEachHomogeneous$call. V% c- `5 v8 i6 m, d$ J
        (heatbugList,
2 W9 e4 O8 k: g1 Z         new FCallImpl (this, proto, sel,# U' q' {# l1 b" |
                        new FArgumentsImpl (this, sel)));
5 ?+ X! c3 U% i  C0 m8 {    } catch (Exception e) {! ?$ I# B6 z+ m& E0 J% s% O
      e.printStackTrace (System.err);
" W& u+ f- |; S9 v2 {+ R    }6 l% D( g/ ^5 d( S& S$ L  h3 _6 k
   
# J. B8 I  a& h1 J' w    syncUpdateOrder ();5 p6 Z2 D7 l, n8 p/ ]4 h

; V  I$ v4 \3 R  b    try {7 L- c# r, X3 D& U
      modelActions.createActionTo$message . @/ ?  k1 Q0 M8 y: h0 d
        (heat, new Selector (heat.getClass (), "updateLattice", false));: J" e$ N7 J. j8 w
    } catch (Exception e) {* c# _! U" t7 e" A! i
      System.err.println("Exception updateLattice: " + e.getMessage ());3 K9 T8 L  b: Y. i
    }, N3 I  [1 s& t, X
        7 A$ G& R# D( I1 Q- \
    // Then we create a schedule that executes the4 O$ i; U; P7 o! F
    // modelActions. modelActions is an ActionGroup, by itself it8 [$ `, s( F1 z4 k" l: L  w
    // has no notion of time. In order to have it executed in( ?9 i) i( @' o( ?9 h0 k
    // time, we create a Schedule that says to use the
- d7 b/ l" o2 h4 j3 h    // modelActions ActionGroup at particular times.  This
! I* c# ?9 [" ]3 G$ B/ a( p    // schedule has a repeat interval of 1, it will loop every; M4 W. C5 w; k2 B- ^& v4 j+ z
    // time step.  The action is executed at time 0 relative to1 G5 W7 H2 Y2 X
    // the beginning of the loop.4 E; z- U9 a# v4 B

/ `6 D: X' E: X' u1 K' U    // This is a simple schedule, with only one action that is( l: K: V- B% t! @( R. a. A
    // just repeated every time. See jmousetrap for more
( f. N+ ~7 [6 L; u! Y& i3 u, j    // complicated schedules.
  u% \. |! z# C9 }7 ?- `& M  
  }% M7 ]3 K& h1 c7 e# E- ?7 }    modelSchedule = new ScheduleImpl (getZone (), 1);0 `- f0 l7 U; E0 ~2 ^: A
    modelSchedule.at$createAction (0, modelActions);
2 r4 c) o  O+ k5 v0 [' L2 ~/ A- y- ~/ G        
' |; `8 `2 m, b- o, n! _9 W    return this;
' _5 I% T+ B, B* ?9 p+ a: a  }
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