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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:/ G) T4 [2 D  D% |# a2 ~
9 z# m4 c+ z( m' ]  q# F+ W
public Object buildActions () {
$ Y2 }4 P- `$ m, A$ ]  l0 X    super.buildActions();
5 j0 J6 w) t1 M: I. J" i& z    ! U* {+ v0 b4 L; h# m0 E& A
    // Create the list of simulation actions. We put these in2 a: ?% s0 M$ F6 b: l
    // an action group, because we want these actions to be( V- m7 G: Z& l4 ?; t/ I
    // executed in a specific order, but these steps should
  W2 _3 q3 |. Z3 {% w  g% a  ^    // take no (simulated) time. The M(foo) means "The message2 `# e' _* U  v
    // called <foo>". You can send a message To a particular
( y2 l, u& w2 N6 h    // object, or ForEach object in a collection.
  u/ B! ~/ Z( Y/ k7 B  b& j0 c        
- h1 L) b- O4 F, E# F( A    // Note we update the heatspace in two phases: first run
3 i9 C' ^5 v0 `9 B. Z1 m; E    // diffusion, then run "updateWorld" to actually enact the7 I# }$ m3 y& S$ x+ K, `; s
    // changes the heatbugs have made. The ordering here is* F" r. ?) U/ {  o0 i
    // significant!
/ ^; o- h" [  A7 G" M& y        ' @* U. K, p, t( R
    // Note also, that with the additional$ J8 a/ t7 m5 C# P9 P, j2 U* H
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
& r& A$ W9 q: ~, ~' H    // randomize the order in which the bugs actually run* ~9 L% l4 n5 D6 r1 p, x4 ]
    // their step rule.  This has the effect of removing any. Y2 s# W2 B* e& X, d
    // systematic bias in the iteration throught the heatbug
& U! n! k' y' ~" H' M    // list from timestep to timestep! t  m. _# O4 N, f' o* c+ F
        
1 D7 g  m% `4 U! K* y    // By default, all `createActionForEach' modelActions have. G8 L8 I& o/ ~" U; f. u! e3 S
    // a default order of `Sequential', which means that the4 \" Y$ W. S% o2 n
    // order of iteration through the `heatbugList' will be" b) w) N* O" @- B
    // identical (assuming the list order is not changed
. ^. V% o. m7 D# {3 _    // indirectly by some other process).8 |% M0 ?9 F! ~& ?8 E9 @
    ' G4 d1 Y$ |! @' h: h8 K2 L6 n
    modelActions = new ActionGroupImpl (getZone ());" }' U% v+ ~1 @! e2 b

9 T; k1 r; D. l" r( ^* f: |& a    try {2 ]! N. e4 n8 e- o! t# o- Y5 @" \
      modelActions.createActionTo$message3 L' {$ z6 P4 R! n  H5 C9 N. e
        (heat, new Selector (heat.getClass (), "stepRule", false));5 O6 N. E# _' N) a
    } catch (Exception e) {
+ _  k0 z: R2 h/ c+ b6 K: S      System.err.println ("Exception stepRule: " + e.getMessage ());5 }7 V6 M5 v8 u" G
    }
" q- z* }" o; P6 B; b7 r0 i) y) {) n3 B/ `( G3 ^9 v7 B% s8 @9 q% l
    try {
8 `( K% g. j6 w* x  e      Heatbug proto = (Heatbug) heatbugList.get (0);( j8 b8 \5 c1 s0 Q& {5 ]
      Selector sel =
+ `  G" [! }1 r) l. e" `: V3 r        new Selector (proto.getClass (), "heatbugStep", false);) N% n1 z2 Z& w/ n# m; C1 F
      actionForEach =
$ F- M6 C* E' i( u        modelActions.createFActionForEachHomogeneous$call
9 h2 a$ \7 r) R$ I) {        (heatbugList,
1 `. h9 X/ P1 f: {+ m         new FCallImpl (this, proto, sel,
0 \$ {( I2 p/ O+ z                        new FArgumentsImpl (this, sel)));
  E7 B# U! O0 Y* e0 f6 ]    } catch (Exception e) {
! z1 A7 `5 w! }# h5 U$ c      e.printStackTrace (System.err);
: D; ?: q; l7 y, e/ x3 R    }  n$ \, j% j" B  b* k  z
   
  ]: S4 M$ _' ~/ c0 i! Z% [    syncUpdateOrder ();3 x2 L8 A# g: R' G

* u- S/ ?, v6 E2 g6 }$ Z$ G; I7 |    try {* q" Q# R6 P  w. m
      modelActions.createActionTo$message # {2 V. q8 K1 D& `: z/ T: U+ ~
        (heat, new Selector (heat.getClass (), "updateLattice", false));2 D2 |1 g! G1 Q8 O' e
    } catch (Exception e) {
; I/ N" a' Y3 f+ L      System.err.println("Exception updateLattice: " + e.getMessage ());$ \9 l  H; E. G2 m! y
    }
  J8 r( d* L# l2 q        
* I5 N1 m7 X% G/ a    // Then we create a schedule that executes the
/ \/ B% g9 D, W3 x( X    // modelActions. modelActions is an ActionGroup, by itself it1 _' j& e+ N; F& q! p
    // has no notion of time. In order to have it executed in/ j  S- j! F7 z1 y
    // time, we create a Schedule that says to use the& w, d% G: Q; P/ g
    // modelActions ActionGroup at particular times.  This
6 C+ i# V$ X4 Y3 g' t    // schedule has a repeat interval of 1, it will loop every
0 F+ J/ A* h: u$ G( s    // time step.  The action is executed at time 0 relative to( A0 Z7 z. |7 i7 P0 ]6 m' H
    // the beginning of the loop.  o$ M* j+ [  N

1 i1 D# m  {7 D, k  |. x    // This is a simple schedule, with only one action that is
8 p& C! _! l/ ^% I" C    // just repeated every time. See jmousetrap for more7 z7 R* _4 }, |$ F1 _
    // complicated schedules.  \/ U9 n& u6 n* |0 H
  . C( Y/ [7 W- B: `
    modelSchedule = new ScheduleImpl (getZone (), 1);' H$ ^0 Z5 ^+ B4 P
    modelSchedule.at$createAction (0, modelActions);
0 w, d/ C0 _- ~8 b( d7 p        
) A* G9 \, D0 E+ O% [8 L    return this;
1 a$ a# t4 {+ W3 W  }
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