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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 Q0 N. v- Z1 z8 i( {8 U# j2 y6 z6 C
public Object buildActions () {. ^2 R# Q) `# I/ `/ l& ]
    super.buildActions();" J% z- z: ^/ Y" ~5 Q5 R
    0 }8 F( v' W" @" K  ~+ H) J
    // Create the list of simulation actions. We put these in1 T2 y3 v- g) I) q# i9 ?6 r
    // an action group, because we want these actions to be4 R. H# J- W. p: @) y7 j2 I& C
    // executed in a specific order, but these steps should
" u% ]  F. @0 S: S: `: K    // take no (simulated) time. The M(foo) means "The message, R( d/ y. p  `  h1 E' m2 l% u
    // called <foo>". You can send a message To a particular$ R8 M+ {/ h0 G) S
    // object, or ForEach object in a collection.
, ^2 a( Y% g; a! y# W        
8 k  s/ o! u9 L# R8 \5 L' v    // Note we update the heatspace in two phases: first run
# S# r1 m4 l: z5 n! g" e    // diffusion, then run "updateWorld" to actually enact the
  c$ U" M' k6 O+ I& r    // changes the heatbugs have made. The ordering here is
% a, j3 D8 r! l3 [8 j    // significant!* ^! ]4 b. U3 ~
        
  W* M7 k, G. [5 B) h$ d# u    // Note also, that with the additional0 J3 y$ y" ~: _. q9 w7 D0 J
    // `randomizeHeatbugUpdateOrder' Boolean flag we can3 ]0 M5 ], C3 N, `6 R
    // randomize the order in which the bugs actually run
( l: F1 K  M+ F9 i) T" X    // their step rule.  This has the effect of removing any
# S5 s7 f* Z: a$ Y; l, W    // systematic bias in the iteration throught the heatbug. S" L, j- ]8 f: W
    // list from timestep to timestep7 ^) L: Z: f. l0 E- Y
        
* \! Y( w1 t+ @- D5 H5 c    // By default, all `createActionForEach' modelActions have  n, `2 L/ x( C: ]% [2 G) r4 a# w
    // a default order of `Sequential', which means that the( C3 b: z- R! u
    // order of iteration through the `heatbugList' will be, t/ P; q3 S$ U. w
    // identical (assuming the list order is not changed5 T. `3 K# T. k1 Z/ P: t4 |
    // indirectly by some other process).
7 z! W7 t7 B) A& G2 o8 q4 i! J8 y    2 N3 D  {; P! g2 W' H+ r, w
    modelActions = new ActionGroupImpl (getZone ());
. [& T3 N+ @, y1 V8 F3 Y2 x0 m% g3 L* b3 ^# G9 m
    try {5 G, N( ?, f! c* C" ~- W  k) a8 W
      modelActions.createActionTo$message
/ @+ K! L! J& c# l        (heat, new Selector (heat.getClass (), "stepRule", false));
5 o) c1 t0 e9 _% d' Q* i! Q& D    } catch (Exception e) {
* q% @( p& u* |7 J; I3 {# L# k      System.err.println ("Exception stepRule: " + e.getMessage ());% t$ [% @  P& z! M" E; k# J9 f7 j
    }, M0 q7 D0 O$ N* W. J2 J

( e3 _$ m1 D& ]# p" |! ]/ U: n    try {* O! L0 s1 {- L; Q& a0 e. r
      Heatbug proto = (Heatbug) heatbugList.get (0);7 G. ~! y% u% D* w$ u: |
      Selector sel =
7 r$ ^8 \& o+ o, `        new Selector (proto.getClass (), "heatbugStep", false);/ n' L" ]* R6 E; q
      actionForEach =- \, }* H/ P7 B4 @
        modelActions.createFActionForEachHomogeneous$call7 }/ ]- ^% _* M' d. p
        (heatbugList,4 @. U( z8 c- W1 \& ?: S
         new FCallImpl (this, proto, sel,
* I4 K. m. h" f                        new FArgumentsImpl (this, sel)));$ }$ x. J8 c' O; I& f
    } catch (Exception e) {) M& ]2 z* V9 ]( |& x+ i3 s
      e.printStackTrace (System.err);
/ i& N( T$ E  g; J( x    }
$ s% |6 X# J. I' D5 X   
2 M: O7 j% k, r; v' y; I8 G    syncUpdateOrder ();
- ^1 h% W6 I! b9 N# }% ]. }1 H- O7 ]$ V/ m$ Y7 h4 U
    try {
- |! ]1 A: Z# E# b7 i0 F" a- V. B      modelActions.createActionTo$message / X# e5 ?9 X9 M- \, M& e. B# \
        (heat, new Selector (heat.getClass (), "updateLattice", false));( E$ M4 l7 G' X% i
    } catch (Exception e) {
% N9 q1 {2 Y5 R% Q+ Z8 i! A4 H      System.err.println("Exception updateLattice: " + e.getMessage ());& Q! ~/ N/ H  C- {3 D" Z! y. o
    }
: K( U% V. J. R) A+ A, J" R4 Q! R        
' F, ^5 h  \6 u0 k* i    // Then we create a schedule that executes the$ O5 N" `% \3 L0 [) o( a6 m
    // modelActions. modelActions is an ActionGroup, by itself it
: i- f' h6 I# S    // has no notion of time. In order to have it executed in" d" @, A8 X0 n( {
    // time, we create a Schedule that says to use the
/ K" }) J* K4 I9 Q: k9 p    // modelActions ActionGroup at particular times.  This  ]: }$ `- R' o# [1 `! H, t
    // schedule has a repeat interval of 1, it will loop every
7 J0 O4 Y( K9 m5 Z7 I    // time step.  The action is executed at time 0 relative to
) D# Q( t6 j  w2 N# u- h    // the beginning of the loop.2 U6 V8 e7 d$ k: _2 f9 d& E7 ]) A
4 X/ v% `% m9 t$ b) v
    // This is a simple schedule, with only one action that is
  F9 v: v1 S4 U( t    // just repeated every time. See jmousetrap for more9 J4 P! `* v, ?/ I
    // complicated schedules.
1 R; l) J* Z# |' K/ r  
' y9 t9 x& _% F9 c' I& z    modelSchedule = new ScheduleImpl (getZone (), 1);2 Q) E; U& v# O8 j6 r8 B! i
    modelSchedule.at$createAction (0, modelActions);
2 B9 [- E4 s7 ?- ^        % |- T( p, I3 W8 e$ ^! c6 G. D/ t
    return this;8 e+ D9 U0 ]8 O) J
  }
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