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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:
( D7 f8 F1 m0 k" G; x. W- J
3 I! x+ h6 h" j" R  a public Object buildActions () {
& [! A: i# B; a4 ~    super.buildActions();
5 {& M. N, @* e, X4 o5 e( Y   
' b+ ?1 @" v, T+ U6 ], G    // Create the list of simulation actions. We put these in' E; J* s* ?$ |  J2 L
    // an action group, because we want these actions to be
4 d8 S* c  s' p/ n    // executed in a specific order, but these steps should% l# J$ h) H. H. r0 e! ~
    // take no (simulated) time. The M(foo) means "The message
+ y) J! _( f7 p$ N: n    // called <foo>". You can send a message To a particular7 V9 P' [9 X& ~: D/ ]$ z
    // object, or ForEach object in a collection./ t5 I4 z% \( V. W; `) I$ O
        
/ a' ~: l, N, D; D9 [5 G    // Note we update the heatspace in two phases: first run) T3 L2 N3 k$ ~) M. Z) [/ v
    // diffusion, then run "updateWorld" to actually enact the1 A' R& G* k1 |% s# U
    // changes the heatbugs have made. The ordering here is! O4 M- C. r0 ^* [9 Y# X
    // significant!
" Y  c4 U( W& o        9 ]+ R* P; g2 z' Z+ c2 M
    // Note also, that with the additional. [  E: T5 w7 J2 W+ @
    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 k$ J- B, {6 h- B
    // randomize the order in which the bugs actually run+ S. o. m  n: a; P! o3 e' c
    // their step rule.  This has the effect of removing any
7 e, @6 E% D1 N4 `    // systematic bias in the iteration throught the heatbug
- O; }2 y: e) e" o    // list from timestep to timestep  _4 ~. \# Z, L2 d! X4 M
        ! ^" |' e0 [& c) h; p6 R: j7 g3 z
    // By default, all `createActionForEach' modelActions have
" b: F% q4 @) W6 u3 v    // a default order of `Sequential', which means that the; s4 s% ?8 B: [: b. E
    // order of iteration through the `heatbugList' will be+ b6 Q7 _: ^: [5 I, o3 ?/ |8 y
    // identical (assuming the list order is not changed# O9 r* |: d$ F3 K
    // indirectly by some other process).
! N( o* ]: M+ U) ?1 ]5 |   
1 ]& H6 ?# O5 X5 L1 [+ d9 M6 A    modelActions = new ActionGroupImpl (getZone ());* |1 `6 Z5 G/ o/ @- W8 Q
4 F- {; K( m& @* N+ |
    try {6 i( Z9 ~6 t, i1 Y0 Z
      modelActions.createActionTo$message( O# V. |+ K* ^' ~
        (heat, new Selector (heat.getClass (), "stepRule", false));9 c; k+ w. v; f; n5 q
    } catch (Exception e) {2 n9 R/ ?) ]' D/ @  h# y
      System.err.println ("Exception stepRule: " + e.getMessage ());( K& I9 k! ]/ A) V. Y. k
    }) u5 p2 l6 }: L. A' s

6 s# f# g4 I' l, }    try {$ n* y8 F: i& a3 j( U$ C
      Heatbug proto = (Heatbug) heatbugList.get (0);
+ _6 P& X7 g: X, M* O      Selector sel = 6 y; Z  m% B" [1 Q' x: t
        new Selector (proto.getClass (), "heatbugStep", false);) {# ^& ]9 Q0 n0 S" k/ n
      actionForEach =
) I  S/ w9 c2 E% k: r0 n        modelActions.createFActionForEachHomogeneous$call
) I, @# |! i  [3 C) r        (heatbugList,
$ U9 }1 |& L& G# |" E1 B         new FCallImpl (this, proto, sel,  u5 C" O" {3 h# f/ J. I& l
                        new FArgumentsImpl (this, sel)));9 c" k9 S+ `" M. Q1 H
    } catch (Exception e) {
( X+ b( P8 f- ?$ z* r1 ^& d# z      e.printStackTrace (System.err);
; X2 s0 |2 q7 f: C# i    }& ?) j& G1 p7 ~+ A8 E- s) t% Z
    - n6 y& n! g% H/ w, [; }
    syncUpdateOrder ();  W. W" E) R! N: V3 C/ A" m5 |9 Z

, l, Z5 ?* |0 B/ i7 e% Z    try {' c# ~+ H& A& `5 y6 N
      modelActions.createActionTo$message ; y& v- z$ t8 Q9 g
        (heat, new Selector (heat.getClass (), "updateLattice", false));) e+ D1 [% K) c0 F
    } catch (Exception e) {: E. b1 B8 U, t* V( l+ n* ]0 }. X
      System.err.println("Exception updateLattice: " + e.getMessage ());
$ D. a5 t* O+ i2 L: R4 D    }
) y: {' ?" Z' x% U        - E# h7 Z, I  |8 R/ m
    // Then we create a schedule that executes the3 y, J0 }# O- H
    // modelActions. modelActions is an ActionGroup, by itself it
8 @; E/ I& r' k1 W( W; D9 E    // has no notion of time. In order to have it executed in  N* B+ e( c/ L  g0 c
    // time, we create a Schedule that says to use the
; g1 W! t/ Z# }    // modelActions ActionGroup at particular times.  This2 m+ ?! a; I4 J
    // schedule has a repeat interval of 1, it will loop every
, x( q, A% @/ z9 f- c    // time step.  The action is executed at time 0 relative to
+ _- G) q' |3 L0 p- S    // the beginning of the loop.3 A0 S0 ?. e8 Q- i' L! T0 G

( s1 g8 _7 X4 M* Q" z    // This is a simple schedule, with only one action that is
- B1 h8 G; ?( v. M' b8 n    // just repeated every time. See jmousetrap for more' e. k6 `, a* ]4 g3 T8 Z* U$ P- d
    // complicated schedules.
, M& v! d# _& H4 V0 j) f" E5 Q  
/ ^  P0 u/ \$ [& C: g( U# M, B5 R3 _    modelSchedule = new ScheduleImpl (getZone (), 1);
4 q( q# r2 F9 P1 Q" _! n3 T1 V    modelSchedule.at$createAction (0, modelActions);5 Z* M3 Z3 u, b
        ' O& x2 C/ C+ }" V4 x
    return this;
6 c& N9 Q( i- D  }
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