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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:; q4 S; x+ J6 M* x4 o" K- [/ w, {

; L% c4 P' Q: P, j& N) b: V public Object buildActions () {
. S8 W9 u! p6 W    super.buildActions();- _8 S6 O) Z" ]4 x4 n
   
  T7 G4 c* f4 Q& J3 U2 o. T- ^7 i    // Create the list of simulation actions. We put these in
6 Y5 ?( `4 y6 K$ P, @3 u    // an action group, because we want these actions to be# v& D, ?& R4 ^
    // executed in a specific order, but these steps should" O  {/ V4 `& }2 X7 p
    // take no (simulated) time. The M(foo) means "The message  W$ L) L; a# r2 L3 _5 G$ U
    // called <foo>". You can send a message To a particular
7 J' M9 I6 Z$ s) Y8 I    // object, or ForEach object in a collection.
2 M7 r8 s: C! s        " p. `9 D. ^! x+ {  @  n' K# D
    // Note we update the heatspace in two phases: first run5 C4 E6 |2 ~/ }6 W: Z. p
    // diffusion, then run "updateWorld" to actually enact the
+ }) o& Z0 P' ^    // changes the heatbugs have made. The ordering here is% p" T9 c! y' d2 u6 ?+ L$ P
    // significant!
6 ~  t+ U9 j7 U0 @        
3 K6 a9 A7 o$ q6 B0 R    // Note also, that with the additional
' P/ M$ a. T$ \1 x9 W# V    // `randomizeHeatbugUpdateOrder' Boolean flag we can# r$ g3 z5 e" X) |
    // randomize the order in which the bugs actually run0 A. _0 d2 I6 I. X7 [
    // their step rule.  This has the effect of removing any) `, c! I7 y! T, ]+ j
    // systematic bias in the iteration throught the heatbug; T1 Y% f/ f( ?& }# I  E
    // list from timestep to timestep! V/ M0 Y; S9 E" J% f: D+ x
        
4 S: L0 _4 O! P) @" y    // By default, all `createActionForEach' modelActions have
: L) Z9 D& Q( Z+ h0 E" q$ X: |5 P% x    // a default order of `Sequential', which means that the* |2 L, \5 q: N+ Y+ q
    // order of iteration through the `heatbugList' will be8 B/ ~! A5 d+ c3 p8 g
    // identical (assuming the list order is not changed
6 M& j' \: i& h) n, ]% I0 D' I6 @    // indirectly by some other process).
6 e9 T/ G9 @7 ]0 C+ D& H# M   
% b1 y2 g+ g- m1 V& f    modelActions = new ActionGroupImpl (getZone ());  ?. L3 l4 l  `
# C7 \" j' ~) o4 H
    try {
( X& t4 T6 o& \/ ~- Z# q6 q      modelActions.createActionTo$message$ G  G& W* f. I! w- a/ Y+ O
        (heat, new Selector (heat.getClass (), "stepRule", false));$ X, z7 D# Y0 j
    } catch (Exception e) {
0 I* [- d' V7 l% {      System.err.println ("Exception stepRule: " + e.getMessage ());' z& x# m4 |1 @2 ^& P3 @
    }% m- E" o8 ^5 e6 @1 X$ U4 J

" `( O8 e" X% y" c& e! Z4 P    try {
# w+ d/ g& z- s) f1 s      Heatbug proto = (Heatbug) heatbugList.get (0);: T! p' i( |6 r$ ~% b, \8 F- g
      Selector sel =
7 u- A5 X3 p! N! B1 r: p- U, U& r        new Selector (proto.getClass (), "heatbugStep", false);
# @# m5 |2 {$ S      actionForEach =
" T. Y' m6 r& K( e% z" u        modelActions.createFActionForEachHomogeneous$call
1 m! E$ `) f+ M+ D" J  e; F        (heatbugList,
, K8 ?2 j1 ?& a7 ^         new FCallImpl (this, proto, sel,
  c5 F$ j; j, A# j3 H$ T                        new FArgumentsImpl (this, sel)));* @7 Y1 p" L! e$ k, D* W$ @
    } catch (Exception e) {. I1 L* g0 R4 ^7 `: G
      e.printStackTrace (System.err);
5 F# @/ N1 k# V: h    }6 I7 s* t3 h4 c' B$ v% y
   
# J& a% D; a) J. I    syncUpdateOrder ();0 l9 t* E/ _; T4 R4 H, c

' e7 _& h/ b2 }5 u& P- ^( Z    try {' f7 `6 T+ J5 T
      modelActions.createActionTo$message
0 ]" C$ g$ u; i2 \1 O        (heat, new Selector (heat.getClass (), "updateLattice", false));: |+ @! f- e0 Z# K
    } catch (Exception e) {. n  r9 a. {0 C; l
      System.err.println("Exception updateLattice: " + e.getMessage ());
' E5 s0 v2 k: Y: \! r    }9 Y* L7 E; h* U% ?( u5 Z/ B. K1 i
        / n" H- k- C! h2 G; v
    // Then we create a schedule that executes the9 [5 M! b# [" H+ J
    // modelActions. modelActions is an ActionGroup, by itself it6 P; T( P1 T6 K- B) d0 r2 H* C
    // has no notion of time. In order to have it executed in
; [' G' q1 S, K! m2 K; @    // time, we create a Schedule that says to use the# P( ~$ I- J  D. a. M0 z! r
    // modelActions ActionGroup at particular times.  This* V* B( z! m5 h: @& U
    // schedule has a repeat interval of 1, it will loop every+ ^' c$ b0 }& {! n' C3 L! Q
    // time step.  The action is executed at time 0 relative to
9 c& d" b7 X& Z5 h' d    // the beginning of the loop.& K( }! n/ e8 T. q+ H4 V
1 j9 z8 H2 N! [9 Y" x% |
    // This is a simple schedule, with only one action that is  W8 g. |( e/ n! R" o! n
    // just repeated every time. See jmousetrap for more: O* G( f; f0 E- y* y2 I9 Q  k
    // complicated schedules.1 n0 i0 B& j! k& v# ~1 j
  + b, K% |. C* R9 G
    modelSchedule = new ScheduleImpl (getZone (), 1);
8 s$ ^5 C  }: x0 N    modelSchedule.at$createAction (0, modelActions);, u% H- u6 m& E" ~0 I4 C, a
        
  H  v8 {; x. ^    return this;
& J' }1 B6 Y. h  }
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