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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* [, o) s4 k7 U1 _) _: e3 f
6 Y' B1 j6 U$ R1 V: J0 ^ public Object buildActions () {, a$ D5 a6 u, p% x
    super.buildActions();2 f# w4 E0 l+ `" O
   
) ]% j+ ]8 b$ t/ j0 n    // Create the list of simulation actions. We put these in- x. }6 b$ h4 G
    // an action group, because we want these actions to be
, a- h2 G) }. B  D0 V    // executed in a specific order, but these steps should" _1 ?; s, a% d' x3 q8 G+ ~
    // take no (simulated) time. The M(foo) means "The message
! m# U- n; L  C9 S7 \    // called <foo>". You can send a message To a particular1 c1 F3 W" C7 h2 d
    // object, or ForEach object in a collection.3 G4 W* R6 o1 e, @  v
        
; P: L) `) j( l% y2 Y+ z* U    // Note we update the heatspace in two phases: first run0 H& ~3 @( O' d) Q. t2 j6 C; H
    // diffusion, then run "updateWorld" to actually enact the
5 I! G/ s3 u, s7 H+ B7 `* i9 p    // changes the heatbugs have made. The ordering here is9 m# p5 ?. I2 W+ f% N, a- K4 `+ w
    // significant!
7 D8 ^4 a# N, a, `- q. b; X( D        # @$ N4 N. T" a4 Y, a- Y
    // Note also, that with the additional
$ j/ g( c: d+ e! C- l) C    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# F9 a; W. a7 u$ x4 {5 b    // randomize the order in which the bugs actually run
( B( Y, }# r! |    // their step rule.  This has the effect of removing any
) k; J2 f/ `! `% L    // systematic bias in the iteration throught the heatbug
; a2 c8 {( R; t! V! P5 U* V4 A3 t  l    // list from timestep to timestep5 t( Q# l( T5 @) k
        
/ b5 N! S& n8 R7 V1 H$ O    // By default, all `createActionForEach' modelActions have
3 L( o5 t/ _8 D" U! u. ^    // a default order of `Sequential', which means that the
% Z7 L3 c1 P1 M    // order of iteration through the `heatbugList' will be
: Q4 ^2 j% f# U    // identical (assuming the list order is not changed
( M& ~6 `2 J6 |1 |- j( y    // indirectly by some other process).
0 d* A4 U9 [6 X% L& @    3 C( M# Y% R' b% X$ Y  [
    modelActions = new ActionGroupImpl (getZone ());% O0 J2 D7 c/ E- g  u
; Q/ K: s- s, i0 c# z& i1 d
    try {6 v( O* `% m  u
      modelActions.createActionTo$message
2 r% V  i. I5 [3 |        (heat, new Selector (heat.getClass (), "stepRule", false));
, M: W8 X! e7 X( W9 O    } catch (Exception e) {
0 g' b3 N0 R4 ]      System.err.println ("Exception stepRule: " + e.getMessage ());
) k3 k% x4 e2 N( [9 K8 c2 \& |  e    }- [5 A, j! R  {+ c. x

6 H3 E* U, |  A4 J2 I) T$ s& N* I' e    try {
1 s5 Y1 I) H/ s( a      Heatbug proto = (Heatbug) heatbugList.get (0);
8 p7 `4 x7 z; P9 ~      Selector sel = / i4 l" n& j& o
        new Selector (proto.getClass (), "heatbugStep", false);: b+ u/ b8 B/ {
      actionForEach =
4 @0 V( t- `1 D; T! T/ y7 t* k        modelActions.createFActionForEachHomogeneous$call( `/ \& t0 l( q, o6 Q- s
        (heatbugList,% H1 n$ G5 P1 d2 H* ]; \1 ~/ {
         new FCallImpl (this, proto, sel,
; S+ r3 j4 B! f                        new FArgumentsImpl (this, sel)));! a0 B8 g" d/ q6 t9 L0 S
    } catch (Exception e) {7 S: E. o2 j' t# ~
      e.printStackTrace (System.err);8 F  R) c" i( v- d
    }# \* D# t) Q: _# i6 }
   
. y0 J9 n5 ^, X2 E+ I    syncUpdateOrder ();
0 \! {6 ^. y8 ?, A% B4 l% C' ~. W. n7 E5 I8 x' T
    try {  J4 F5 w1 _! e0 w/ ?+ x8 i" I. k
      modelActions.createActionTo$message
* Q) f; w3 X+ n9 q# ?  i& D        (heat, new Selector (heat.getClass (), "updateLattice", false));2 S- n' p% J. ]# K
    } catch (Exception e) {; ]7 u' R( v- ]& D& U( Q% D
      System.err.println("Exception updateLattice: " + e.getMessage ());
( b$ M/ c) Q; S# z' |/ F    }" i/ h0 U: m; z0 M) h2 {
        4 [, K5 J* r5 P1 [
    // Then we create a schedule that executes the
6 l& y+ ^/ O- @3 E# \1 g    // modelActions. modelActions is an ActionGroup, by itself it* t+ y" d4 j$ l% }' i) _: ]( t
    // has no notion of time. In order to have it executed in- E5 e5 c; M% M
    // time, we create a Schedule that says to use the
: }# |# R! u; q+ x* x    // modelActions ActionGroup at particular times.  This
; S4 x+ @$ R0 N+ d    // schedule has a repeat interval of 1, it will loop every
( e/ x& D% K4 d. m    // time step.  The action is executed at time 0 relative to
6 d9 u9 A& t/ G' t. k$ T- v    // the beginning of the loop.
, ~9 L  x) @' T$ `( e* s1 E# q; w# x" W( @# M* b% q8 C- ~/ `
    // This is a simple schedule, with only one action that is1 B0 I7 h7 U" g& d7 I6 A4 p: ^
    // just repeated every time. See jmousetrap for more$ v' q* S. `: m- `
    // complicated schedules.
- v5 v  z' A( W- F* r4 E, J  
( A, v: O3 u. B    modelSchedule = new ScheduleImpl (getZone (), 1);
& v  q3 z6 O4 Y, E* t! ?7 C/ h) x    modelSchedule.at$createAction (0, modelActions);' ~( ~- ]2 S. E( r
        
& M( r" J# D) Q6 \9 ~8 D* a    return this;1 X+ Z) r9 S6 T9 b
  }
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