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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:
3 O( `9 v1 J  Q5 n) i2 ?3 e* y& h0 ]4 i) V6 i
public Object buildActions () {* G* w. B5 Q' T
    super.buildActions();
. v9 |: `* g7 g: H2 [! a    # g+ ?3 k4 R1 M& S1 ?' i, K4 _5 E
    // Create the list of simulation actions. We put these in
$ @) W6 j# T, ?1 v8 E    // an action group, because we want these actions to be/ _5 _/ V# ^7 y, o$ h! e
    // executed in a specific order, but these steps should
( B) A8 h1 i6 k' R. t5 H    // take no (simulated) time. The M(foo) means "The message
5 v; r$ T) f5 }    // called <foo>". You can send a message To a particular
# |' s# O& l0 L2 x5 i3 N' S8 u% @    // object, or ForEach object in a collection.: |0 N8 P' I5 c" ^1 {9 Y( m
        
, B3 |" S1 B/ J0 ^$ j    // Note we update the heatspace in two phases: first run
1 f2 }# \+ C% x. Z    // diffusion, then run "updateWorld" to actually enact the- h- P; m5 c, U
    // changes the heatbugs have made. The ordering here is
! u* A9 J; V. [. E& M* l3 G! g    // significant!, s) E) c: ]; M9 B# H
        # ^1 ]) Y2 b/ M( [5 K! h+ u
    // Note also, that with the additional7 u. C5 X4 A( m2 h) q+ |/ g
    // `randomizeHeatbugUpdateOrder' Boolean flag we can$ i+ `8 P/ @$ B) Q, u9 q/ g+ E
    // randomize the order in which the bugs actually run; D! n/ _) i6 D, ^
    // their step rule.  This has the effect of removing any5 ^/ n5 _/ Z. e( n/ ^: p5 L
    // systematic bias in the iteration throught the heatbug
; ^7 f6 W9 C: [2 h; J- E    // list from timestep to timestep! g7 t( M& T2 q: M7 ?5 K: N
        5 S4 S+ I* r, s$ X
    // By default, all `createActionForEach' modelActions have
- J* `' q9 F6 q* J  V9 o: a    // a default order of `Sequential', which means that the$ Q8 l$ Q) V: ^) [
    // order of iteration through the `heatbugList' will be  n% {( }& A" o" D  p" f, D1 ~% n
    // identical (assuming the list order is not changed
% {0 b; Z2 @& J4 H! m2 K5 B    // indirectly by some other process).+ J' y+ ^% z9 v, I! P1 k
    " ]2 a  a2 `$ w$ e  r
    modelActions = new ActionGroupImpl (getZone ());  J" a, D3 z7 e, {) X& i

0 z5 h9 q2 E( z    try {
* Y/ M) b6 |+ @! h/ \, B      modelActions.createActionTo$message
0 W: f. F: Z" k! M: Y  B7 C        (heat, new Selector (heat.getClass (), "stepRule", false));
1 X7 ~) m3 N- m% w4 O    } catch (Exception e) {2 l( ^" c$ P' i3 \9 g: A* p
      System.err.println ("Exception stepRule: " + e.getMessage ());
9 {) B8 @% W" q, [+ _    }; n& l2 o) \6 Z6 p( D- C6 ]' w

$ j& }5 ]2 k, b! R    try {/ |3 U4 i: j$ A
      Heatbug proto = (Heatbug) heatbugList.get (0);" `$ c3 j4 X! m; L1 {+ F% r
      Selector sel = / P2 W* ^4 ~# A7 B( `' n
        new Selector (proto.getClass (), "heatbugStep", false);) k2 V4 [5 ^0 V6 R( {2 ?
      actionForEach =
! h, |( j! t+ v' Z; n" n        modelActions.createFActionForEachHomogeneous$call% p; h& e' S9 ^; S! H7 e8 D5 x2 Q
        (heatbugList,8 A. N/ [, m9 A  G( j$ [% U
         new FCallImpl (this, proto, sel,
8 n, q. {3 a0 `0 C4 r8 z/ q* J                        new FArgumentsImpl (this, sel)));
- {* H' l- \5 H9 B2 ?5 B    } catch (Exception e) {
+ z1 O/ S$ k" }! M2 w3 u  K      e.printStackTrace (System.err);
3 b0 q  V1 _/ p9 l4 O3 n  L    }* r4 M& p# C0 ~7 ^% l/ Z. i/ {- Z' p
    ; @$ x' P) p! z8 P! {& z9 L+ H
    syncUpdateOrder ();
. T8 \1 V4 d  I; _( t- H
- u0 |+ f1 `! E    try {
4 b! U0 R% Z, d; D      modelActions.createActionTo$message
- P1 C" }/ _4 S8 N/ G. a# }        (heat, new Selector (heat.getClass (), "updateLattice", false));. P: a) r& l- q1 R! X
    } catch (Exception e) {
3 R( U, W6 n& @+ m/ l0 }2 d      System.err.println("Exception updateLattice: " + e.getMessage ());
, M7 [* m( V8 M* }: ~2 X$ y    }
! g: i. b! n1 E5 ?        6 P2 S" j- k/ Q4 L/ v, o
    // Then we create a schedule that executes the
8 F9 w/ N, \" H* _0 {: e0 C    // modelActions. modelActions is an ActionGroup, by itself it5 q7 p$ `  G. A# Y5 v- r4 B
    // has no notion of time. In order to have it executed in* Y( W0 r1 x0 o# x! q. f  S
    // time, we create a Schedule that says to use the6 T4 {9 t9 ~$ x0 n6 ~
    // modelActions ActionGroup at particular times.  This
  [3 m" u- m" z5 }    // schedule has a repeat interval of 1, it will loop every
# R/ {$ v! v( m& j& K9 S    // time step.  The action is executed at time 0 relative to3 d  a9 g8 e! Z; d0 Z& W
    // the beginning of the loop.
" @$ q* @3 j2 f% N* s8 N+ `/ T. s  ]7 @( J' d6 V5 M8 Q; E
    // This is a simple schedule, with only one action that is( X2 e4 h+ i" [  W! v
    // just repeated every time. See jmousetrap for more. R$ Z2 T- e$ G/ \' T
    // complicated schedules.
/ y- w: X2 J) s5 J  
6 x9 R( L6 a, }1 D' }* X1 Q! g# q) L% f    modelSchedule = new ScheduleImpl (getZone (), 1);5 z) N1 b3 k8 E: U; U+ C/ ]
    modelSchedule.at$createAction (0, modelActions);" v. b& y6 a* `+ B( _7 ^$ A: C
        ; _- J4 i, H' v: s- d4 A. W
    return this;2 r* ?$ H  V+ o8 t
  }
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