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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:- U7 F- R' I3 g1 E
+ U4 d- q5 o# ]; b& I
public Object buildActions () {
$ C6 U0 |  `3 n    super.buildActions();
0 t: v' Z1 Q; t# }( v1 v3 @   
8 D  u/ Y# j5 o    // Create the list of simulation actions. We put these in
5 p0 G* r8 f5 P5 R8 K! \6 H. \    // an action group, because we want these actions to be
3 ~! z; s+ L( n' d5 O4 X    // executed in a specific order, but these steps should% D1 X" t- s. J/ c# Y, Z( W
    // take no (simulated) time. The M(foo) means "The message9 O- c, k2 R* c: p. ?! [/ M) o
    // called <foo>". You can send a message To a particular6 u7 u- ^6 {6 X( v
    // object, or ForEach object in a collection.
3 r8 ^( S' b2 j$ t: x7 K        
0 |" `) `) _& }2 l) R    // Note we update the heatspace in two phases: first run
3 Y' M& F1 ]' t3 ~    // diffusion, then run "updateWorld" to actually enact the; M3 C2 c/ v/ j
    // changes the heatbugs have made. The ordering here is
, b/ {3 u$ U. s- L3 a7 [    // significant!
6 W4 h3 j2 I: T        - B  X: X" T" f, u/ ^) M3 @0 b
    // Note also, that with the additional
4 d2 p. \  L$ p: l$ e+ @. ?' l- v    // `randomizeHeatbugUpdateOrder' Boolean flag we can6 F& w: E; w$ W! `1 v5 e5 R/ b1 g
    // randomize the order in which the bugs actually run
6 f0 n6 y9 X: q8 M% b, |    // their step rule.  This has the effect of removing any1 j8 H  c1 c% Z0 X. r
    // systematic bias in the iteration throught the heatbug
; X0 q- o* K: q    // list from timestep to timestep
- S- C$ {$ y( R3 ^( d, `. K6 I( w        
* f( ~: W3 D& t% w: ^# d5 T    // By default, all `createActionForEach' modelActions have# V* X. {: a0 J
    // a default order of `Sequential', which means that the
0 Z8 }# ^8 p4 x    // order of iteration through the `heatbugList' will be; E( t4 F9 k: r: m- J6 y- L
    // identical (assuming the list order is not changed
9 }) N# a. n+ S2 t    // indirectly by some other process).) }$ p5 G, Q% e
    : Z* ]& e+ A. A
    modelActions = new ActionGroupImpl (getZone ());
4 {/ I9 g5 k# V- q. A
- |9 N' x- u% ?4 f" }/ Y% C    try {
* B  c& y& w2 V+ F      modelActions.createActionTo$message: [. W+ L, _2 A1 ?
        (heat, new Selector (heat.getClass (), "stepRule", false));* \# q$ s6 I/ n+ M' u
    } catch (Exception e) {. l& y6 _; w. G* l! u9 R
      System.err.println ("Exception stepRule: " + e.getMessage ());
' R! r, B* ?: F3 Q( T. O    }9 i) g$ C% e" ^$ |( u) s1 f. Q7 y" h

. I( W* V# c4 `    try {! c( Q$ D, g1 [1 v4 i, I3 L
      Heatbug proto = (Heatbug) heatbugList.get (0);
; c6 Q1 o) B! x' x% ~. N: U      Selector sel =
2 q9 W8 ~# K: T) z        new Selector (proto.getClass (), "heatbugStep", false);8 t+ |3 k0 F! F; g# H' i4 t9 u
      actionForEach =
9 Y; X9 W, L" D9 g2 y! I  G        modelActions.createFActionForEachHomogeneous$call
0 e) \: N; X9 O1 C  a! q' m        (heatbugList,
  ~! Q' r9 y( y5 ?, j/ D+ c         new FCallImpl (this, proto, sel,$ E' y( X  w+ Y3 _
                        new FArgumentsImpl (this, sel)));
3 O" M0 q  W7 x" b7 Y    } catch (Exception e) {
: O8 K( R+ I6 W& c  {      e.printStackTrace (System.err);
4 r% i6 i& @$ {" {3 ~& {* R    }
* O5 E; u5 T" V0 A    9 W7 V& ~4 g# ]) t/ Y# U& L2 [: `
    syncUpdateOrder ();: m* F" |% O% j" g0 z2 q: L

8 p! C3 `2 ?. l' f    try {
2 U) f; ^  }; p5 ~      modelActions.createActionTo$message * G) Z& n! [, T5 S) T: `
        (heat, new Selector (heat.getClass (), "updateLattice", false));2 s. \1 L9 [5 p9 A( N
    } catch (Exception e) {
. O4 ?* k  w& N      System.err.println("Exception updateLattice: " + e.getMessage ());
  K' E: A8 o0 S) W/ C2 ^0 i9 O" F    }
5 D3 U" M2 P0 f$ O/ B        / s% h2 D' O. E7 f
    // Then we create a schedule that executes the
% F- {# Z( h/ b4 i$ G! j    // modelActions. modelActions is an ActionGroup, by itself it, `7 ]; t# _/ I; U& j
    // has no notion of time. In order to have it executed in
' k3 O2 H) \4 H/ t1 D    // time, we create a Schedule that says to use the9 y6 _- L) ?- t1 D
    // modelActions ActionGroup at particular times.  This8 J7 |0 f, a7 A2 j
    // schedule has a repeat interval of 1, it will loop every
9 r6 W- V$ S8 g, X( u    // time step.  The action is executed at time 0 relative to& }9 X/ M, ]' }) Z0 Y+ }- @
    // the beginning of the loop.3 Z# R! H% K* {7 \% F6 {0 X

9 g4 y" L$ W5 f    // This is a simple schedule, with only one action that is6 k! a3 m6 b! J4 x; d5 ~. ^! ?
    // just repeated every time. See jmousetrap for more& d/ R* t4 L" ]1 y6 w+ V- R1 k9 A8 t  Q
    // complicated schedules.
  D8 E: a* n% Y, h  
: O$ k. ]+ ^5 [9 P; j) e; F    modelSchedule = new ScheduleImpl (getZone (), 1);& {& H; G9 p6 ]: H
    modelSchedule.at$createAction (0, modelActions);
9 _- r0 O$ _+ u7 D        
) O  G4 _+ P& G7 A* L/ X    return this;% Y7 |8 R% `, l1 }) j
  }
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