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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:6 `9 O- `+ h" d" I# i* c( H% P% u

4 M) y! b" D/ D% ]; ^  K2 P+ j public Object buildActions () {1 s+ ~, r6 V$ L# Z5 o* y# O& R9 a
    super.buildActions();0 l  `3 c8 q+ [' ?3 p4 \
   
' D% G1 s  Q! n. N2 O9 c3 f    // Create the list of simulation actions. We put these in
" C( z2 h8 g( u" F4 i+ `4 a    // an action group, because we want these actions to be$ O9 k0 F4 H0 x0 S7 q
    // executed in a specific order, but these steps should
0 `: ?5 C7 Q4 U/ X2 L    // take no (simulated) time. The M(foo) means "The message8 K/ u1 x' q" r
    // called <foo>". You can send a message To a particular5 e' ]0 e* t$ [4 x
    // object, or ForEach object in a collection.+ W7 C& r4 i# J/ I1 n; C
        7 \& \) Z1 Y% s: m( X8 w" u
    // Note we update the heatspace in two phases: first run
& d! s4 W: F0 }0 V& e    // diffusion, then run "updateWorld" to actually enact the
: E1 n5 X1 b  @9 S& ^    // changes the heatbugs have made. The ordering here is. N8 R8 S+ M5 ], C, U
    // significant!7 X$ L  N2 e. [. E3 d
        3 `! F, N6 R( b( ?6 @
    // Note also, that with the additional
; s, J% T! q/ T: r( }    // `randomizeHeatbugUpdateOrder' Boolean flag we can( l# ^1 W" m: f2 v7 B% X
    // randomize the order in which the bugs actually run
" C) i  Q! N* r  [1 d0 g    // their step rule.  This has the effect of removing any( _8 R* s4 \+ P) S2 W
    // systematic bias in the iteration throught the heatbug
( d' e: }1 L0 O( V. ]# x    // list from timestep to timestep; Y8 |3 a% |! P* Y% t
        % c4 ~* x0 n4 R) n) {! L: T% r$ R
    // By default, all `createActionForEach' modelActions have
$ G9 Y$ D. @5 v- n# v    // a default order of `Sequential', which means that the9 z7 k* ?& ~2 z$ I; |3 I6 e
    // order of iteration through the `heatbugList' will be7 X: |( z: z" Y. }, F1 D
    // identical (assuming the list order is not changed
3 O& U- B+ w. H: n- w7 ~" w$ z' O    // indirectly by some other process).
& M0 M0 e9 Y8 T7 m1 t    ! v+ H/ W/ e' D2 B( S
    modelActions = new ActionGroupImpl (getZone ());$ n, ]8 ]+ ^6 I4 G6 F4 m
$ @+ p) Y# F7 V0 E9 K
    try {( j7 j3 {' O3 z" m" e% k0 d
      modelActions.createActionTo$message
% I9 u" ?# Q9 b$ L  {- {& }        (heat, new Selector (heat.getClass (), "stepRule", false));
& X; `' _' @: d' k6 L7 \5 ]    } catch (Exception e) {
+ }3 y6 l5 v1 e4 J( z! `( s: `* d      System.err.println ("Exception stepRule: " + e.getMessage ());
* O! k" s/ A* S3 W" V* c& `    }( C) k, y0 P" D
9 n! n( c+ u8 k6 ?. |$ s
    try {6 C9 c% g6 y3 I9 w9 s
      Heatbug proto = (Heatbug) heatbugList.get (0);5 L' r/ q1 q( G' K2 ~) v  K
      Selector sel = . D) {1 p& v" o0 ~2 l( r
        new Selector (proto.getClass (), "heatbugStep", false);( D5 Y9 O+ ]  Q6 J3 Q9 o  V
      actionForEach =/ B# m. n! I. ]3 c: A2 F
        modelActions.createFActionForEachHomogeneous$call6 h9 @5 q) n, {6 F; l! A" b' Y
        (heatbugList,) J  G; R. D) k% w% ?
         new FCallImpl (this, proto, sel,
4 Z1 G3 J) S# q; l- `- o                        new FArgumentsImpl (this, sel)));
" J6 U* Q/ k& v! Z" \: e2 Q    } catch (Exception e) {# l# B4 h5 X. `# Q  t  O1 P
      e.printStackTrace (System.err);
- u3 z9 I6 I2 f; t5 u    }) _& d# ?) ^7 {2 G* S
   
' _4 j& A1 p( @, y: r% |    syncUpdateOrder ();
1 w1 |( s0 f5 ^. D4 v3 t: v5 `4 s4 i+ k, J
    try {- z( Z* c6 g- M& O% t$ B
      modelActions.createActionTo$message , X# ], I, f) O+ p& ^" `1 X
        (heat, new Selector (heat.getClass (), "updateLattice", false));1 U3 x# [( i4 M9 n0 P3 Q. T
    } catch (Exception e) {$ R% g, I2 H) Y6 r' y* \" c' Q
      System.err.println("Exception updateLattice: " + e.getMessage ());1 k6 Y: l' x7 L2 y; H
    }5 |. S: u/ B( x( D3 c: y' k
        
! b* M$ q  }& u    // Then we create a schedule that executes the
% _' J" b) f& `$ [% C    // modelActions. modelActions is an ActionGroup, by itself it* m9 C: i8 q7 }+ r( O3 h: ?
    // has no notion of time. In order to have it executed in% P) L/ [' c! y# M: ^# A
    // time, we create a Schedule that says to use the, I% n$ o! G) o: ^; G
    // modelActions ActionGroup at particular times.  This
& C* s* d$ i+ l- b7 o$ s- a    // schedule has a repeat interval of 1, it will loop every' ^* o7 d; I% k0 S. e
    // time step.  The action is executed at time 0 relative to
  e/ e( n9 ~) c    // the beginning of the loop.
& d4 [3 Z9 |* ]7 F; n1 f1 R  {% K+ R
    // This is a simple schedule, with only one action that is( f. a3 k' G5 R+ v0 E
    // just repeated every time. See jmousetrap for more
- f4 D2 l: q- E8 g1 G# N6 b+ z3 e    // complicated schedules.4 u8 H0 G  M+ w7 K# v
  / ]( I' k) Y) U/ z# A; F
    modelSchedule = new ScheduleImpl (getZone (), 1);, A( a+ v( W: b8 X( c
    modelSchedule.at$createAction (0, modelActions);, O7 n* c% y- h* P# u
        
: F4 K, C# P3 m    return this;$ N8 S; u# R- \7 A! Q
  }
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