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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:
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public Object buildActions () {. |2 q/ Q* K, f0 S( h! ]
    super.buildActions();
& _1 J6 c9 P3 v3 Z# w    & O- _& O4 M# o7 `9 S/ g' s" Y9 F
    // Create the list of simulation actions. We put these in
& p3 e( d- _/ i" l$ D    // an action group, because we want these actions to be
: E. u$ l- P9 R& U" C1 _    // executed in a specific order, but these steps should! Z. Y9 z: n  ]& q
    // take no (simulated) time. The M(foo) means "The message
( b' R! H" ~+ f" r2 f/ D    // called <foo>". You can send a message To a particular* Q6 P" g1 ~" a* x; q9 n' W) V7 I
    // object, or ForEach object in a collection.! S+ t* p$ ~- v+ E3 M. d$ |
        
% O' ?4 |2 L' `    // Note we update the heatspace in two phases: first run, X/ G* L0 _! f- j/ a4 ~
    // diffusion, then run "updateWorld" to actually enact the
1 M( B' r: e& K* W/ ^6 Y    // changes the heatbugs have made. The ordering here is
8 G. `' X# [, S+ x    // significant!
) Z0 H4 I3 l8 F: `8 |        $ j6 [$ g- K  y
    // Note also, that with the additional
" i9 F: I$ C$ }4 L    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) [/ ?" H" m* v, J8 @. w- Z    // randomize the order in which the bugs actually run( D% }$ X4 j0 P' M
    // their step rule.  This has the effect of removing any0 e& h% F* B# |5 h9 H1 s1 f
    // systematic bias in the iteration throught the heatbug
; [' Z% h% g- `+ O9 u: l6 \0 ^, q    // list from timestep to timestep
5 [+ }! r) W. x        
$ p% i# W& w9 n4 L) B5 K    // By default, all `createActionForEach' modelActions have
; y, M" Z* @% k7 i* H4 |    // a default order of `Sequential', which means that the
. ~$ k7 ]/ B# P    // order of iteration through the `heatbugList' will be6 f$ a1 D4 f& p0 N2 {' V
    // identical (assuming the list order is not changed
& m" i) x& i; Z! Y, _; J: {: g    // indirectly by some other process).
/ L- E' W% V+ r" y" h   
4 t; n% Y' w: ~" L( L2 [    modelActions = new ActionGroupImpl (getZone ());
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! U' q; A7 q/ v6 \- b1 u    try {
1 w! N$ y/ J% w$ [  V      modelActions.createActionTo$message
0 {& V8 |2 l4 o! O6 Y        (heat, new Selector (heat.getClass (), "stepRule", false));+ i  M' `. L: D
    } catch (Exception e) {
2 k, B" |) G" L: D      System.err.println ("Exception stepRule: " + e.getMessage ());
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      Heatbug proto = (Heatbug) heatbugList.get (0);0 w4 |+ b8 H- M' S( i
      Selector sel = + `6 e9 \: ^; L2 J' B+ V2 Q
        new Selector (proto.getClass (), "heatbugStep", false);8 \% x  K; w2 Z. m
      actionForEach =9 S1 w0 c; ^- H% P
        modelActions.createFActionForEachHomogeneous$call$ M, R! j6 {( S8 ?4 B
        (heatbugList,7 w) d' b; Y/ q  c. n/ X
         new FCallImpl (this, proto, sel,- E' R$ z/ S& `
                        new FArgumentsImpl (this, sel)));
8 }* ]. O4 h  ]    } catch (Exception e) {4 ]- v* I# t: d( b2 r
      e.printStackTrace (System.err);
8 q% B% ~$ c: q8 _, C$ i/ L6 m    }" f" w" |3 g3 [! j' C7 u
   
; h+ b- u1 A9 t7 O) O    syncUpdateOrder ();
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    try {8 t2 n; L. O. i  A$ h  ^
      modelActions.createActionTo$message / C" _. I+ e7 ]( J3 X7 h9 O2 t
        (heat, new Selector (heat.getClass (), "updateLattice", false));
1 w8 u: D9 F8 R    } catch (Exception e) {
6 o! Z: I% z. h, I0 X% W" U      System.err.println("Exception updateLattice: " + e.getMessage ());
$ |* U* Z; W! w    }0 Z: ~  S$ i' A7 l" {. e8 v* s
        6 [5 g8 u2 w! ^, g* X9 g3 _
    // Then we create a schedule that executes the
, |' Z: j# U/ D2 B/ J; D    // modelActions. modelActions is an ActionGroup, by itself it  ], e& W+ f1 q9 \4 c
    // has no notion of time. In order to have it executed in
/ J- z* U! m0 y    // time, we create a Schedule that says to use the
$ E) z& w, M/ Z7 ~    // modelActions ActionGroup at particular times.  This
4 K4 p8 |1 m" ^8 S5 o) j    // schedule has a repeat interval of 1, it will loop every% d7 v9 T# n, S& T1 ?3 N. D9 Z
    // time step.  The action is executed at time 0 relative to
- O- h$ f' Y0 r; Z. r; }6 j    // the beginning of the loop.7 @. r/ l, O0 @: s7 }' x

) \/ Z% z+ _  v. Z  q* Y7 W! A    // This is a simple schedule, with only one action that is5 J& I: E  t3 z
    // just repeated every time. See jmousetrap for more7 \: i. A2 Z$ N- C
    // complicated schedules.
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    modelSchedule = new ScheduleImpl (getZone (), 1);5 r+ [9 O1 t' c! P( \
    modelSchedule.at$createAction (0, modelActions);
. [4 A0 X5 }+ d: F6 y2 ^        
* B1 j- {6 p* c/ W; E    return this;
; C3 p* f% a. m1 W3 i6 _' e  }
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