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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:
: I9 e4 X* e5 t" L( @  Y
9 H5 Y: z: ~5 m! H* Y5 v/ d0 e public Object buildActions () {$ I. _3 W' f( f1 J
    super.buildActions();( y0 b1 m$ S/ Y5 v; l% U) S
   
, V) J6 Z; V! k$ P0 ]& g# Y    // Create the list of simulation actions. We put these in
1 L' d& Y& i8 t. r# F5 }. t' m- k    // an action group, because we want these actions to be; B/ ]/ C* W( j2 U# l4 f7 O8 B
    // executed in a specific order, but these steps should, p. _- e) c. @1 c4 P7 K" D# d
    // take no (simulated) time. The M(foo) means "The message! h8 }5 p4 x; @6 Q4 T5 {2 A
    // called <foo>". You can send a message To a particular
1 |4 n; `$ a0 i( m& T: ^- s    // object, or ForEach object in a collection.
( x3 ~: z- K3 T* m2 u        + j8 g+ H( N3 f
    // Note we update the heatspace in two phases: first run
6 H$ c  X4 t+ ?5 l! W5 w    // diffusion, then run "updateWorld" to actually enact the
, n$ k  |% U' C5 Y    // changes the heatbugs have made. The ordering here is
0 b# K8 X6 ~; \5 x7 l7 p- w    // significant!3 h6 b6 t$ {- ]. Z$ ?8 ?  g
        
: K; a* x. j8 v1 l' c4 h8 |+ Z    // Note also, that with the additional- W' N, J8 {& K
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
, U* z1 P: U8 E- W1 C; I    // randomize the order in which the bugs actually run% T/ }8 T# k+ C& C0 Q, Z  a
    // their step rule.  This has the effect of removing any3 f: D+ w+ b4 t9 l) s/ `
    // systematic bias in the iteration throught the heatbug7 R) h1 t# j* |5 H
    // list from timestep to timestep
% N' W9 L5 G8 l        + t" I7 b) E% C( g) Y
    // By default, all `createActionForEach' modelActions have9 H9 K& f9 z* S7 V9 A8 X7 d. I& X
    // a default order of `Sequential', which means that the. U  R' ?  k0 Q8 h( F. e
    // order of iteration through the `heatbugList' will be
3 T8 N" u$ b. L5 P    // identical (assuming the list order is not changed
4 `$ Z" Z7 }3 S2 G, n& J9 B    // indirectly by some other process).' ^) {- K  D8 E0 o' s
   
: k' E5 G4 r7 f" u    modelActions = new ActionGroupImpl (getZone ());7 K& d, u/ ^, g" X

: {+ L/ _- j4 }" e    try {
' T3 n' m. t/ o0 o- r      modelActions.createActionTo$message+ V- I+ y, q) `0 I% a1 s) ?, k
        (heat, new Selector (heat.getClass (), "stepRule", false));, x* V, y( d$ i# M" |
    } catch (Exception e) {0 e0 U8 z+ I% H( _; q. Z' s
      System.err.println ("Exception stepRule: " + e.getMessage ());
. }! U& c0 S) ]  Q+ H* _- F    }
7 J. C4 p- }. N, y5 H9 y# H  `: `. u/ g' {4 L9 y
    try {6 A8 X7 \1 b. H6 O- l: X* N
      Heatbug proto = (Heatbug) heatbugList.get (0);
9 l8 P0 [: W$ G0 ^6 k# G+ k" N      Selector sel =
& t7 h7 |; I: g3 K" `3 D3 D        new Selector (proto.getClass (), "heatbugStep", false);
3 r: v( Q1 |2 p( r' e      actionForEach =: }4 x% _4 U. E+ U3 o
        modelActions.createFActionForEachHomogeneous$call9 z; F3 w) j6 J2 `$ `
        (heatbugList," p+ {! M& X9 g$ ^4 [# y- q
         new FCallImpl (this, proto, sel,( C1 j, t( |: W9 d4 f
                        new FArgumentsImpl (this, sel)));& {6 a4 ?5 d3 J& V9 c/ R8 _
    } catch (Exception e) {0 \4 j" a& l: E7 I4 t/ E, o
      e.printStackTrace (System.err);0 B  F, ^& i6 k/ z( \+ a" l& P/ S
    }7 w3 }  p8 f& t
    7 K6 H, a! [5 I+ H$ g  [5 P
    syncUpdateOrder ();
" i+ X/ @, a; Q! g3 K- d1 p2 n2 O% S9 k* {( V! i" z
    try {! O5 u* Y, f' a3 x1 K
      modelActions.createActionTo$message : c/ V, j( F; K$ V' _
        (heat, new Selector (heat.getClass (), "updateLattice", false));- l  |, x. k4 y1 w' N- ^7 N
    } catch (Exception e) {
7 s0 U9 d# R5 R7 L" D      System.err.println("Exception updateLattice: " + e.getMessage ());
" |4 B* C$ J/ P) p6 a    }( M2 t; ^# h( g& J5 ~6 T
        / W2 s: I# i5 R& ]' S. x7 h. A
    // Then we create a schedule that executes the
) i5 q1 Q# b9 m! n    // modelActions. modelActions is an ActionGroup, by itself it0 Z; ~) n- V- _7 g! Y( {% Z
    // has no notion of time. In order to have it executed in
' d. N- Q- n' ~2 F7 n. O1 _4 P    // time, we create a Schedule that says to use the/ X$ a& p/ \( h: x# J% y! z6 e) d7 s
    // modelActions ActionGroup at particular times.  This
5 t) x% i. A$ U8 H! ]8 ]% X9 U! d    // schedule has a repeat interval of 1, it will loop every8 j, D/ D) }" [9 o. E
    // time step.  The action is executed at time 0 relative to1 t2 u+ a* {# Q+ X% X
    // the beginning of the loop.
, t4 |; [: _7 ^& N
: q) n. T1 v# r. P6 q, X. V. V! m    // This is a simple schedule, with only one action that is9 ~3 n2 a# h' t/ a* m% o+ ^
    // just repeated every time. See jmousetrap for more; V0 y. ?# r; Y9 M& X. E6 g+ |
    // complicated schedules.
( r' A; S* @& O  I: f2 v  
. Z, z  ^2 Q, i  ]; R    modelSchedule = new ScheduleImpl (getZone (), 1);+ F1 o9 T6 N6 o3 J$ ~, d7 \% j6 c/ `
    modelSchedule.at$createAction (0, modelActions);5 H: [( O/ a6 |& H" R6 C& m" f
        
, w; s0 F, _+ M7 q/ D) k- Q6 u    return this;, c- m5 z  D2 ]% |0 c
  }
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