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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:
- ~' j+ T! }* x' f  s8 P5 a* d) R2 w- C& b3 A8 t, ^
public Object buildActions () {
8 q: F3 D* ~$ n- i  f9 P& A    super.buildActions();
/ d3 G/ }: A7 ?& y$ [. y   
2 [  s# F2 l( z) O    // Create the list of simulation actions. We put these in) b1 W6 p) i/ ]3 u
    // an action group, because we want these actions to be  v  C7 j  b0 s4 N, J7 ^
    // executed in a specific order, but these steps should- o) Y# O9 u' n0 ~7 l  Q
    // take no (simulated) time. The M(foo) means "The message5 i& ^- \/ r$ I( r# i
    // called <foo>". You can send a message To a particular
2 p$ Y0 G, T9 L: r. x5 c    // object, or ForEach object in a collection.
* {( ^4 w* V% ?7 }' @  J# h8 b        
# w( M$ `. W) v2 w$ S8 [8 g    // Note we update the heatspace in two phases: first run
3 @6 L' w' c( Q/ K! Q+ G    // diffusion, then run "updateWorld" to actually enact the
1 z0 V3 }- c. A7 V    // changes the heatbugs have made. The ordering here is
# t( U" Z. C# ]$ V6 |& ^2 U! H0 ]    // significant!. y) j  p# O! ^. O
        , }: c- X3 P* F& |
    // Note also, that with the additional
0 ^- C0 x$ m" ^    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 m6 w4 S6 I7 q
    // randomize the order in which the bugs actually run2 B: Z$ u5 k9 d3 z1 M# v
    // their step rule.  This has the effect of removing any
5 J% A5 q' ^* a% R* b1 D2 W, f    // systematic bias in the iteration throught the heatbug6 I3 N0 G8 B3 L9 A
    // list from timestep to timestep
6 J/ b$ z2 T, p# H9 D6 C  i* S( P. A        
5 a: F) Y9 E! [9 ], c9 ?; Z1 `    // By default, all `createActionForEach' modelActions have
8 W) \/ \: C4 e9 h6 e/ k  X/ ?! H    // a default order of `Sequential', which means that the4 Q1 r3 C9 S" h( w
    // order of iteration through the `heatbugList' will be
" K  ^! q; N3 b. Q/ G) X2 z    // identical (assuming the list order is not changed. L7 E9 ]7 ~- ~& P2 ]2 c$ g
    // indirectly by some other process)." [- `3 r% F' P& q3 R+ a
   
) J$ m7 B- a& l4 x% q* y  [7 Y/ k    modelActions = new ActionGroupImpl (getZone ());
$ O8 r6 x7 A; j$ u
& `0 M+ Z3 X$ {% Y  f    try {
6 t" `" \; l7 E$ q- Y& S      modelActions.createActionTo$message5 F0 L3 @4 [% G, ^: ?; \# r
        (heat, new Selector (heat.getClass (), "stepRule", false));
" S& B9 w% {0 Q% i( m; P7 c  b    } catch (Exception e) {5 A% }2 |! R3 [
      System.err.println ("Exception stepRule: " + e.getMessage ());
: B/ D+ n0 g6 x6 a, W% s: z    }
4 A) y* H: x( b- H& |; h& ^0 p8 ?. g) ~: _; h) ]$ O* U
    try {
# P* L" m+ g1 d      Heatbug proto = (Heatbug) heatbugList.get (0);# G2 x6 ^2 u! M5 v) ~
      Selector sel =
; J  i9 w, _2 b! j' f        new Selector (proto.getClass (), "heatbugStep", false);( f) w; n; W2 @: K. I$ j# p
      actionForEach =
2 d: T- Z/ q" e; o* I9 P( Q$ L        modelActions.createFActionForEachHomogeneous$call
; Z0 B4 N: o) ^, y+ @        (heatbugList,
1 g3 r( d! p2 k& [' V) i# W; Z# R         new FCallImpl (this, proto, sel,& L- H% {  w, _0 Y# D
                        new FArgumentsImpl (this, sel)));
+ w: t% m/ d# Y- \    } catch (Exception e) {
! Z, n3 z7 Q5 |/ u      e.printStackTrace (System.err);% x& M& Q' Q6 u1 k' W! A
    }
4 A9 L" ~$ ]) O% h$ F   
6 C, Q7 g4 K' ^; r    syncUpdateOrder ();8 O5 v* l2 _' k4 K  m

2 R1 O3 c! y( ~! o" j    try {) a$ I2 r' K! {
      modelActions.createActionTo$message
2 ]/ v" K' z7 N* ]& C# b        (heat, new Selector (heat.getClass (), "updateLattice", false));
+ X# L3 Q) J" S. G    } catch (Exception e) {+ T" x0 E$ P% \8 j! ]/ T
      System.err.println("Exception updateLattice: " + e.getMessage ());6 E0 L- q! g; ]2 u$ J) u' Y( r
    }2 ~) k  S3 t3 `. i* u' z
        
: W  M; f' m% V6 u    // Then we create a schedule that executes the8 Q+ L8 p% e2 T6 E' a- k
    // modelActions. modelActions is an ActionGroup, by itself it/ L( s! q' b/ M" U" ]
    // has no notion of time. In order to have it executed in" x& x* o" n0 R
    // time, we create a Schedule that says to use the6 t: M: \- Q+ g9 q" b
    // modelActions ActionGroup at particular times.  This+ W  Z% X: i. U  a! K
    // schedule has a repeat interval of 1, it will loop every" N' I: R5 u1 A. y
    // time step.  The action is executed at time 0 relative to2 B& H) j1 v8 X" q- I2 f
    // the beginning of the loop.
! F" V/ Q% p. a% R' \& T) }) I5 R; g, O
    // This is a simple schedule, with only one action that is
  s- X: t# t8 A/ a$ P8 P6 M1 w    // just repeated every time. See jmousetrap for more
4 p" F0 U3 P. D& J) ]( ?6 j% k    // complicated schedules.2 z. B- r- ~; o) F9 e" ~
  : V6 D, j1 J$ `5 L
    modelSchedule = new ScheduleImpl (getZone (), 1);  `& n1 u; T0 @% d3 P2 `
    modelSchedule.at$createAction (0, modelActions);
1 Q" I/ i' ?3 ~3 b  ^6 H6 R& w        
6 [9 M) j& M- ?- I    return this;
# X8 y4 r$ a' Z1 e3 Z+ c  }
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