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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:) {' }% P! v( f6 j0 t: W9 a

& v$ E1 e& q: H0 W: V# f! g public Object buildActions () {9 A$ x, s2 o' `
    super.buildActions();
0 Q  P2 |$ u3 n+ R   
* S+ e9 N& V" f1 b- u    // Create the list of simulation actions. We put these in
0 l5 P& e" M( s8 h) j% I0 |! P    // an action group, because we want these actions to be
0 E( Q5 ]5 ^( J$ c* }    // executed in a specific order, but these steps should
' T8 f9 V8 L/ V" o    // take no (simulated) time. The M(foo) means "The message4 O* U; L6 F$ w! w. ~0 Z
    // called <foo>". You can send a message To a particular
# h, v  D+ N1 G& F- w2 U    // object, or ForEach object in a collection.
6 i4 T- D4 L) ?6 G        
- t# n. M( ?1 X7 k6 \0 j( K    // Note we update the heatspace in two phases: first run
- L/ H$ X) m) K: s4 i    // diffusion, then run "updateWorld" to actually enact the
% s2 p) y& T: I/ \" N    // changes the heatbugs have made. The ordering here is
: @0 o# z$ l- C2 V  ^# J    // significant!
' x0 \; D8 S9 X        
/ d' I: P- ]( O0 W2 I    // Note also, that with the additional2 g2 W4 o3 S  ~4 o# {
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
$ T  ^" _% t7 b5 |4 ]9 y0 E    // randomize the order in which the bugs actually run+ W) f: h) g' N% t9 h& c
    // their step rule.  This has the effect of removing any0 k9 H+ V, T6 i/ R  `
    // systematic bias in the iteration throught the heatbug
3 a# h, O& l! W/ J    // list from timestep to timestep
- }' G; D% k" \( k        
3 F7 y$ N5 {+ _% s+ ?/ V; n    // By default, all `createActionForEach' modelActions have
& M# q1 n$ B5 n9 ]  a- ]' u    // a default order of `Sequential', which means that the) f7 m. n9 `! ]
    // order of iteration through the `heatbugList' will be
+ D8 {( d9 x* H% Y! ]3 e% k" k    // identical (assuming the list order is not changed
  b' a& e' @3 ^& i* @    // indirectly by some other process).
, a. d: h# E7 q    ' [  x0 D" K) p( j% V
    modelActions = new ActionGroupImpl (getZone ());
3 U5 e! _" q7 \" e9 {% _) b
. f. W' ]+ R8 W" J  q5 L  j    try {. |4 ^( p2 h5 c+ S; S' d; m( |# u
      modelActions.createActionTo$message
0 Y2 s0 R* B5 I% H0 q        (heat, new Selector (heat.getClass (), "stepRule", false));
! i8 x1 }) F* `/ y' B    } catch (Exception e) {
0 @; c. s; ^) G: N5 k      System.err.println ("Exception stepRule: " + e.getMessage ());
" U4 ^+ I' L; Q; b) P, @    }
" \$ X7 L# N8 Y7 T4 s1 w6 \
" d1 e& J0 m8 h    try {
6 N& g2 n. H' d) E" i      Heatbug proto = (Heatbug) heatbugList.get (0);
0 W2 p' U" O; o0 A% {+ }' K2 |      Selector sel =
: s. R$ ^& p" s: S        new Selector (proto.getClass (), "heatbugStep", false);1 \' E* |4 f+ a; @; x  f/ w
      actionForEach =$ L- F- v# E; t, u& `2 f
        modelActions.createFActionForEachHomogeneous$call- o0 T9 \- v2 Y/ g* X
        (heatbugList,
( l9 ^7 J. F2 G2 q         new FCallImpl (this, proto, sel,1 ?8 u& ^# F! x! r; F
                        new FArgumentsImpl (this, sel)));
! X! ^2 y( x0 _8 f3 X    } catch (Exception e) {% j* b  i2 e; {4 D
      e.printStackTrace (System.err);
0 w, K, g/ N) O2 }6 y) F7 g    }
2 R$ F- j. ^! K) Q   
  U: d4 V& Y; B* z- V9 m    syncUpdateOrder ();
+ e0 ~* W  V+ w5 {4 Z8 ^5 `9 T
2 ^) }$ u6 Y  E( I+ I6 ]1 p    try {8 y8 q( }" L# T! |9 v9 M$ ?6 I' n- _6 O
      modelActions.createActionTo$message 0 I6 y* `6 x3 p3 u; p
        (heat, new Selector (heat.getClass (), "updateLattice", false));$ H: w+ E3 f6 u4 {( @8 P$ w
    } catch (Exception e) {0 S$ o- n, c& z$ R& O4 e
      System.err.println("Exception updateLattice: " + e.getMessage ());
! h. I. [, N) E9 z- k( a    }! h9 [9 w4 f3 e( B+ [
        
) \. u, x7 w5 w& n" ]- l6 u) o    // Then we create a schedule that executes the  G$ Z, ^. R6 b' V. e
    // modelActions. modelActions is an ActionGroup, by itself it
& C; ^; n3 C0 x( H, w    // has no notion of time. In order to have it executed in
! k% A$ n! p: j$ |: f$ l    // time, we create a Schedule that says to use the
$ e! R% s( ]4 V3 w8 S! |    // modelActions ActionGroup at particular times.  This
0 q/ T) o5 k) `: \4 F  y    // schedule has a repeat interval of 1, it will loop every
4 e; f7 |; S. I( O    // time step.  The action is executed at time 0 relative to1 e) W& b: n  r$ g5 {. }' m" K6 O) x: C
    // the beginning of the loop.
( ^$ Z; T9 t0 i, I0 c  h* a, L' q3 L8 i
    // This is a simple schedule, with only one action that is! Y: x& P8 j/ [3 j1 l. H
    // just repeated every time. See jmousetrap for more, m# I' J- ~, o( [  ?4 I
    // complicated schedules.0 R: p, `) {% C" g6 o
  8 _, S; ^: ^" j$ g
    modelSchedule = new ScheduleImpl (getZone (), 1);
* K2 H4 {' b1 S3 r# B8 C    modelSchedule.at$createAction (0, modelActions);& ~1 k9 K' K9 E* u4 h$ ^" o
        
5 b! I, {" o8 G3 J! o% o9 Y( q    return this;8 v# A/ G, g/ B
  }
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