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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:
( x3 X' ~$ B) I* S7 C: }" @4 J; c8 {' r6 z, O5 q( \
public Object buildActions () {+ U# p& H. K% r0 G* ]* |$ q- T
    super.buildActions();
) k0 I- A3 n. p+ b. e      ~& h" e8 f" x* D* ~' g' C
    // Create the list of simulation actions. We put these in
8 h7 }% j4 a! ^; B' l5 e    // an action group, because we want these actions to be" G' W/ b4 M8 k2 B5 p  y1 ?' q
    // executed in a specific order, but these steps should) X+ F; Q# U! {: }  ]9 H. v0 B
    // take no (simulated) time. The M(foo) means "The message
2 \  Y. e% G  D    // called <foo>". You can send a message To a particular3 U4 k7 z3 ]* t! O6 m
    // object, or ForEach object in a collection.
$ k0 K* M$ o6 h" J& Z        
, l- I& w2 C% M4 D0 t4 s$ l    // Note we update the heatspace in two phases: first run
, x& E9 g% C' S) m( f6 U    // diffusion, then run "updateWorld" to actually enact the
* ?8 c* e* {8 m3 f' y2 z+ R    // changes the heatbugs have made. The ordering here is- E5 A9 w0 K) p0 D9 a, g. x
    // significant!
2 A) R) J" E* f' o        
0 P& v+ Q& F) O3 [0 p4 k" `/ m& u    // Note also, that with the additional
9 \3 [7 U* ~5 _7 Z5 @  N    // `randomizeHeatbugUpdateOrder' Boolean flag we can. A. L6 z3 t8 M- t& C8 V( y1 R: g7 V
    // randomize the order in which the bugs actually run" q, t, D, a8 H: }/ Y: h4 U
    // their step rule.  This has the effect of removing any: k4 \5 [- [/ L; d" O) [4 ?% X3 R
    // systematic bias in the iteration throught the heatbug4 A' I4 h/ h+ q: F$ k
    // list from timestep to timestep7 T$ C- }+ g! C. n- m( K
        
2 A" G! y/ p+ C% H    // By default, all `createActionForEach' modelActions have
5 N0 B. u$ y7 d    // a default order of `Sequential', which means that the& Y. {! @& E& E6 d! v) {# S
    // order of iteration through the `heatbugList' will be* K- ]6 ^& e$ Q! {5 G% Z
    // identical (assuming the list order is not changed
' J4 u6 @1 {* F8 t# ^. d- Q    // indirectly by some other process).. |+ G8 F2 a% ]$ a0 `$ U
    . s; _; g7 L3 f
    modelActions = new ActionGroupImpl (getZone ());
7 M- i  r6 I0 x, t+ ~+ H" c3 T9 b) I. \: j1 ?0 N3 j
    try {2 U; C% }5 a% r9 i
      modelActions.createActionTo$message
  _/ C$ Z  W3 M$ V" y+ A3 S* w- `. a        (heat, new Selector (heat.getClass (), "stepRule", false));: k/ s: k& u9 `0 U" Y) n
    } catch (Exception e) {
0 a4 c" P- g8 ~4 [+ C      System.err.println ("Exception stepRule: " + e.getMessage ());
# j! S1 o7 {' d/ [3 z0 o    }
+ o2 o( h7 D6 i4 S) b% D* b* ~% A& P4 S  A3 H
    try {( P# Q, S. m0 W1 o1 m
      Heatbug proto = (Heatbug) heatbugList.get (0);
! I4 d6 `: `! Y" P# f" W0 V9 @      Selector sel = 7 h1 S  Z: z( b8 v
        new Selector (proto.getClass (), "heatbugStep", false);
8 G8 ]9 f% q3 ]; G& m- t! n      actionForEach =1 m; B2 L, L- ~! [0 H
        modelActions.createFActionForEachHomogeneous$call& i! p0 }+ }3 [0 U* h3 A1 F" ~) j
        (heatbugList,. S9 `3 N! a) ]
         new FCallImpl (this, proto, sel,7 q, p, V2 o5 X- i
                        new FArgumentsImpl (this, sel)));
, t  `4 ^% j$ B+ u9 B- x3 @    } catch (Exception e) {
, d1 \: U( `; _+ D' N. O, `# M4 s3 E      e.printStackTrace (System.err);8 [7 B+ d  W3 m3 i' d4 z
    }. I1 t- r; V! t8 G5 T- K3 K+ J
   
% S* ~+ f) h  }8 `& X    syncUpdateOrder ();& ^3 s( V: K1 e/ @$ }

) M2 `* ], S3 W" D: K+ ]  _    try {) t! ^0 d- R7 v( j% Q0 f- f
      modelActions.createActionTo$message * L5 b; {. a$ R: o9 n
        (heat, new Selector (heat.getClass (), "updateLattice", false));8 E! F3 j  K7 Q3 H
    } catch (Exception e) {
4 [, ^" T  G  G1 Q* H! ]2 Y7 Z( z/ h      System.err.println("Exception updateLattice: " + e.getMessage ());
. `4 t9 g. e3 {1 t' @1 i    }
$ R) t3 b8 [; G# L5 [( C+ J9 O0 P+ @" A9 o        
, n# {3 {0 B5 O; B( G; z' [    // Then we create a schedule that executes the. z# C0 h' i* F% l2 j
    // modelActions. modelActions is an ActionGroup, by itself it
. H% p$ ~: k, T    // has no notion of time. In order to have it executed in
7 W/ E! \& V; v0 J6 t9 W    // time, we create a Schedule that says to use the
$ G0 i; |% t& p( Q) k7 c    // modelActions ActionGroup at particular times.  This! u- \7 S; J. k. R/ d" H* n" m
    // schedule has a repeat interval of 1, it will loop every' X: e/ S5 w+ r1 N; q; |  i
    // time step.  The action is executed at time 0 relative to
" l  ~  s' X. [0 t8 K    // the beginning of the loop.' }) r6 U7 Q: P' b, |
$ i  R1 d- @( A0 [5 j1 E- J4 P
    // This is a simple schedule, with only one action that is
7 B, e8 v2 \5 J: N( ~1 A    // just repeated every time. See jmousetrap for more' d7 r0 M6 o7 G+ U
    // complicated schedules.) \# ?1 D9 D- X6 ~) [
  
3 i& g2 [% p. ~% e+ d    modelSchedule = new ScheduleImpl (getZone (), 1);
' c. W/ S7 n: j9 I+ ?5 H( K7 U( O' V    modelSchedule.at$createAction (0, modelActions);
( Y& I$ |  \" }) K- j        8 r, b9 d% v7 ~9 Q4 ?* G
    return this;4 C. D# {9 p% t
  }
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