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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:
, K  Q% Q3 a* P  _$ }2 ^/ I4 p2 }8 |+ y
public Object buildActions () {
' H1 ]; Z0 o2 ^    super.buildActions();
3 I- O/ F) r& Y" N$ l1 G/ O   
4 O( E- A4 F& u3 j' z$ k! u    // Create the list of simulation actions. We put these in' z9 e/ Q& f% m0 W1 t
    // an action group, because we want these actions to be: }, _* t$ t! c- t1 d
    // executed in a specific order, but these steps should
. A# m: `* v# w2 _8 s    // take no (simulated) time. The M(foo) means "The message
. i: [3 g- `1 Y( X0 g    // called <foo>". You can send a message To a particular
* c9 e& r8 Z$ C! E7 @6 h! k    // object, or ForEach object in a collection.4 p- Z- W% Z' C+ |4 T: @
        : {+ X8 ]- @; c+ X6 u
    // Note we update the heatspace in two phases: first run. D9 p0 R3 T3 @) k' [- J
    // diffusion, then run "updateWorld" to actually enact the: v% u: z1 r: P1 f/ s* O. Z
    // changes the heatbugs have made. The ordering here is2 w$ b. Y3 Q# L1 C6 _6 [
    // significant!" X- {1 Q+ }( s" F
        4 P: Y/ Z6 R! q; K" j% x
    // Note also, that with the additional" J4 E$ E  p5 ~. r0 X$ s
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
( z6 {7 ~9 ]9 i4 y3 Z6 [6 x    // randomize the order in which the bugs actually run! d- f! }7 a+ G+ R2 t2 H% h
    // their step rule.  This has the effect of removing any
7 {+ j) H' V1 Z5 a    // systematic bias in the iteration throught the heatbug
# W$ j1 P) F/ ^- R; }8 G    // list from timestep to timestep2 L# w5 m/ |' L; i9 t3 u$ S3 ]) m- T% T' b
        3 y) Z$ O/ N' K2 }8 h& ]4 d" U, B
    // By default, all `createActionForEach' modelActions have
* k9 |! P$ l. G/ t3 [: _9 [    // a default order of `Sequential', which means that the0 {  {4 O2 o: q
    // order of iteration through the `heatbugList' will be
$ Y1 @6 _  m, C+ ^& C& n/ Z' Z    // identical (assuming the list order is not changed: `4 G, G9 I. i" X% F+ L
    // indirectly by some other process).  t, D4 [$ T$ R2 e  Q2 }
   
! w. ^3 B: h8 @# \    modelActions = new ActionGroupImpl (getZone ());
. F9 a0 }/ U' ?7 W% v3 \
1 X- {( N* ^" }, z! G* ~" p    try {
& o; D8 c( g3 z! g      modelActions.createActionTo$message$ N3 l" b. [" X9 `* k# M
        (heat, new Selector (heat.getClass (), "stepRule", false));
2 z# a$ |: ~- t, i9 A    } catch (Exception e) {
8 L/ W3 Y% E4 E' z; M% ~- z      System.err.println ("Exception stepRule: " + e.getMessage ());! ?3 p# k3 w+ ?) h: m
    }9 Y% F3 ?& V! l) E. Z& K

- C9 Q& M7 y# D, N( u6 x& C    try {
' q7 i' e" ?$ k# v* g: j8 M; W3 A      Heatbug proto = (Heatbug) heatbugList.get (0);' ]- h0 r8 l0 b1 ~4 w, y
      Selector sel =
7 W, G" r6 K+ i: ^; R( U2 z  M        new Selector (proto.getClass (), "heatbugStep", false);
2 q$ _9 X2 M' C; u* i      actionForEach =$ G0 M, N6 I5 f  Z  D
        modelActions.createFActionForEachHomogeneous$call' ?7 K6 v( }% k* i& O
        (heatbugList,
5 \! w3 v/ B3 h         new FCallImpl (this, proto, sel,
* s/ I$ S0 x7 Y: e                        new FArgumentsImpl (this, sel)));
# k) Z/ k/ j  ^* [    } catch (Exception e) {$ i+ m1 ]! D( E, C. g  a8 V: ]
      e.printStackTrace (System.err);' L2 H& |( `7 ~8 u0 X+ z1 i
    }
' Z# V) O% h: M& ]+ q: G    / w/ Q+ ^" p/ g) ~
    syncUpdateOrder ();( H& c" Q) _/ Q. C7 F

- k' f6 j: l1 {5 y: N6 d    try {
; v' K5 t' j4 l; T+ B6 D8 E# d0 e* @      modelActions.createActionTo$message
' E% H4 M: s  T0 z, R        (heat, new Selector (heat.getClass (), "updateLattice", false));! t: Q. `+ f: x
    } catch (Exception e) {8 o. }& }8 ~7 X; p8 d& F
      System.err.println("Exception updateLattice: " + e.getMessage ());
1 @  g# S+ \3 F# |' R% J    }
- N" f5 {% g8 ?+ ~# E! T        
' {+ |/ O7 ^' Z1 L0 J' E6 m5 q! N! p    // Then we create a schedule that executes the: s; l( J6 P# k) }  Y' C
    // modelActions. modelActions is an ActionGroup, by itself it/ y& D1 U; y$ _2 F
    // has no notion of time. In order to have it executed in
$ O" ?* P- C7 F2 D    // time, we create a Schedule that says to use the: G/ M8 b0 X7 T0 G
    // modelActions ActionGroup at particular times.  This
: @7 X2 V- s8 Q9 Z! M5 X( f    // schedule has a repeat interval of 1, it will loop every( }4 f' A8 e' Y9 m/ Q
    // time step.  The action is executed at time 0 relative to! B: C& _$ p5 e- J
    // the beginning of the loop.0 J! |( l5 J3 F7 _. y7 ^0 L
' ~0 i3 j4 H$ R& n# H
    // This is a simple schedule, with only one action that is
" `* m; G8 a, B1 p+ \/ o( _0 F    // just repeated every time. See jmousetrap for more
% i! t4 q+ ^( S) ], I. G5 f    // complicated schedules." L5 W( r' H6 n, T6 D
  7 Q" t- v7 N0 i6 I1 P6 _$ k
    modelSchedule = new ScheduleImpl (getZone (), 1);
, S7 P% N* T$ S4 |    modelSchedule.at$createAction (0, modelActions);/ O! Y9 k0 }& E) `4 E  w6 ?
        8 L! i7 m" Y" u; i' `9 y
    return this;
5 w# N" A. Y% z0 V8 U! v0 a9 Y  }
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