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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 m% c8 r' ?" u
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public Object buildActions () {4 O; E! p* u0 m, B
    super.buildActions();: p- d- N4 `: \7 G% B5 ^% k
      Z- v. y3 G+ I) P; p8 X3 m8 G
    // Create the list of simulation actions. We put these in
  H; f/ |2 g  ~5 @    // an action group, because we want these actions to be
; D! B9 N0 q9 K9 p: T    // executed in a specific order, but these steps should
" G4 a0 J8 ]* O1 R' t8 {6 s    // take no (simulated) time. The M(foo) means "The message2 V0 k5 V$ Q; n% K/ A9 k' L
    // called <foo>". You can send a message To a particular& @5 Y2 f* ^) E3 F- C/ q) t
    // object, or ForEach object in a collection.
4 X& C+ T1 g* v5 e        1 M- i1 {( O0 _: H+ r; j
    // Note we update the heatspace in two phases: first run5 N( T7 U) g: N- n
    // diffusion, then run "updateWorld" to actually enact the0 K# S0 }. a6 Y2 G1 T& v: [5 I  [6 J
    // changes the heatbugs have made. The ordering here is' |& U  h. P( y. n& R
    // significant!& n- a. l3 p" a* p' ]3 q
        & V& b7 @% D: ]5 V5 i
    // Note also, that with the additional
; |8 @7 a- w1 Q' Q, J    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 j/ O8 w4 v/ O
    // randomize the order in which the bugs actually run
( J! }7 L0 `$ Z' k. j    // their step rule.  This has the effect of removing any
, O$ t3 x; i8 w; Z% r    // systematic bias in the iteration throught the heatbug
6 B+ |4 `/ T7 R    // list from timestep to timestep
0 [$ m+ }$ p( u6 H& J: k5 d! ^        * @1 F3 P# U; V
    // By default, all `createActionForEach' modelActions have5 g% K/ f7 u- M. i2 p
    // a default order of `Sequential', which means that the
3 [7 J3 L0 r% L$ a, S    // order of iteration through the `heatbugList' will be
' B8 C9 s# v# R/ P    // identical (assuming the list order is not changed9 q9 J% S. x" l& f6 s
    // indirectly by some other process).
$ a! p1 U3 z9 T6 Y3 v; h& o- \   
" ~, H: n9 Q. p2 O% L3 u    modelActions = new ActionGroupImpl (getZone ());! _2 U# ?4 J  b& r* W% A! C
. F, U; e* ~. u
    try {
1 N) t' T. f0 [/ _" R      modelActions.createActionTo$message1 Z" N1 R1 |. X; \3 n
        (heat, new Selector (heat.getClass (), "stepRule", false));
0 m* p- W/ h! X7 h+ ~    } catch (Exception e) {
5 Z* B2 s/ U, H8 H/ A/ ?      System.err.println ("Exception stepRule: " + e.getMessage ());+ M1 c- }: n) m
    }$ f' t  _  X4 s* h2 i; Q+ ~8 X) E# t( T

* k6 }  Z9 m+ k3 p5 j) P" n8 T    try {! D  O/ o6 D2 i* U: W. h8 @, v
      Heatbug proto = (Heatbug) heatbugList.get (0);. b5 H( q( ]- i. i) u5 X4 G
      Selector sel =
  G% w1 |7 ^: b        new Selector (proto.getClass (), "heatbugStep", false);& P% i2 Z7 D7 y0 \
      actionForEach =
9 V& `  J0 J: x/ A' x. n$ D# _1 c        modelActions.createFActionForEachHomogeneous$call4 E6 D1 u" A7 x$ y) B
        (heatbugList,6 H" ~9 J4 @1 T5 O
         new FCallImpl (this, proto, sel,2 x5 f! g- @/ Y
                        new FArgumentsImpl (this, sel)));1 E1 x; P$ _+ Z2 M2 V  d7 y
    } catch (Exception e) {
3 D0 a" ?8 w6 f$ {      e.printStackTrace (System.err);
1 U8 o+ o( S- M0 \3 q0 {    }9 h3 e5 f6 A8 C. n( u  ~7 i6 K
    , Z# N2 \$ t0 p  i
    syncUpdateOrder ();
! b! l4 U/ e4 B  n: f; Z* }- t9 D9 D$ E! t) J
    try {4 ~" N! T* x! Q& b5 r2 A! ^
      modelActions.createActionTo$message
0 Y) X7 S' {' R9 q/ {; T        (heat, new Selector (heat.getClass (), "updateLattice", false));
! F5 ?  C: y2 D5 |* N, m' O    } catch (Exception e) {
" P9 v1 H6 D# s& c      System.err.println("Exception updateLattice: " + e.getMessage ());
: y5 F* n( z- r* i' ]( O* ~9 C    }
% M& D: [6 a# e        
% L* u; Q" _  B# {/ L6 Q    // Then we create a schedule that executes the5 F/ L+ p0 _) x6 F' X7 [
    // modelActions. modelActions is an ActionGroup, by itself it$ A; q2 r0 r* Y* D
    // has no notion of time. In order to have it executed in
  S& C! V# n' n6 J# ?2 x3 A/ r' [    // time, we create a Schedule that says to use the( Y/ R6 c2 C$ e0 R- i4 ~6 T6 S: ^
    // modelActions ActionGroup at particular times.  This
# Q. g4 k* V1 D4 D  g/ w    // schedule has a repeat interval of 1, it will loop every
2 @$ t/ Z; k8 n8 {5 n9 [    // time step.  The action is executed at time 0 relative to* u7 z+ b, c: l3 T. P
    // the beginning of the loop." {2 `  l0 }3 x
8 n0 B3 Y: R* @& J
    // This is a simple schedule, with only one action that is
+ E1 t1 }& F; {) J    // just repeated every time. See jmousetrap for more7 n; s8 Q, N: W9 B+ }4 h# w# x$ v
    // complicated schedules.
1 p6 `) R' r9 O6 s" z  9 K8 l8 P9 {+ ~. @1 _! L
    modelSchedule = new ScheduleImpl (getZone (), 1);
8 x5 j* g' o% Z  r9 j    modelSchedule.at$createAction (0, modelActions);& T% F4 C9 l. `, N. h
        0 K$ g8 \0 w, |3 u: B4 I& w
    return this;
! h: y7 e+ {% e7 @1 ?3 L1 ?  }
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