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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:
$ Y4 }/ y* r# r8 t0 J$ Y3 c
! R0 Z1 W7 u8 h public Object buildActions () {
2 o1 s2 O1 ^( C$ f    super.buildActions();! L* J+ x3 ?: N( }, S
    # e4 V- ]7 ~" f& d4 |
    // Create the list of simulation actions. We put these in
% g' h' S8 T9 ?0 P0 [7 r    // an action group, because we want these actions to be* o+ J& ~: x; s) P% R
    // executed in a specific order, but these steps should/ }. K( ^) X% [$ [4 G  c; m; z
    // take no (simulated) time. The M(foo) means "The message5 L- U, V# {1 O/ {8 ]
    // called <foo>". You can send a message To a particular4 @' K! [) J9 Z' r
    // object, or ForEach object in a collection.8 R7 y# s! ]7 r
        + G) x6 u0 d0 R
    // Note we update the heatspace in two phases: first run
# z& H5 O) E, N6 z, {1 H    // diffusion, then run "updateWorld" to actually enact the
" d( t5 Z  h: Y  a    // changes the heatbugs have made. The ordering here is
! n$ a# n( K- q7 ]( m    // significant!
& G: x$ ~% L8 {        
! @8 w% F& O. ?( d/ g2 x    // Note also, that with the additional
9 M) O$ S% {" e& j9 @3 ~    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 {1 i3 Q+ @% H' k3 C    // randomize the order in which the bugs actually run
! W, g' e& k4 U. a    // their step rule.  This has the effect of removing any
; }- C7 q4 T" z  y    // systematic bias in the iteration throught the heatbug7 @7 F6 @2 f* z5 c& v
    // list from timestep to timestep
+ E+ ]- T2 ?% Y* ]; m- @- |        
, e3 G" s6 E) x6 Q$ `+ t    // By default, all `createActionForEach' modelActions have' ~2 v& s; o& p% z
    // a default order of `Sequential', which means that the
+ W% C2 r1 O7 c    // order of iteration through the `heatbugList' will be* ^6 S/ j8 M+ F( F7 R" X$ y! A
    // identical (assuming the list order is not changed, c' e3 S: m8 z- j! L; P
    // indirectly by some other process).4 L" R( b! J, X+ k, A  D/ a; h
    1 S6 V0 \, q5 n5 S- K7 ]. b
    modelActions = new ActionGroupImpl (getZone ());
6 z" k' r/ L6 i0 Q
. J. l9 t# \$ B" _) `    try {$ A2 u( J7 M7 N( _- u; b1 h1 a' C
      modelActions.createActionTo$message' w  D! v. P' |& J6 [
        (heat, new Selector (heat.getClass (), "stepRule", false));
- f! b/ Q  O2 N  o; R& [    } catch (Exception e) {+ m/ K4 v* q3 \8 b4 e
      System.err.println ("Exception stepRule: " + e.getMessage ());
( u& X6 |$ ~' g6 B, V! R    }& C! V2 R8 {7 V, ^# M/ W0 @2 y
4 r8 u$ `" A! s: k
    try {
* ~$ G  }( x1 E' w1 I  u      Heatbug proto = (Heatbug) heatbugList.get (0);
; Q  t. }, N# Q      Selector sel =
  y/ P( M7 r4 @% k2 `- x        new Selector (proto.getClass (), "heatbugStep", false);1 b0 m# t7 Y! u* Z# ]
      actionForEach =6 Y: B0 l! q' Q3 i# F' G4 k
        modelActions.createFActionForEachHomogeneous$call( ?7 O3 s/ A5 H: b1 i
        (heatbugList,8 {+ k- Q5 _1 H6 j  F6 Y
         new FCallImpl (this, proto, sel,
( @* j7 }2 f5 w9 t; J" s% D6 c                        new FArgumentsImpl (this, sel)));
7 ~; F4 b& j' J( F) i  t    } catch (Exception e) {7 i0 b. _8 E1 D$ N3 j
      e.printStackTrace (System.err);
" A8 i5 y6 x( _9 Q    }% ]& L& }6 B' G. i5 M
   
% {" C, n3 v# ^+ K$ K$ q    syncUpdateOrder ();- O& S1 `3 ]' x% c% J, \, G

6 g+ K4 F! E! j8 q    try {3 P  v1 n: W0 [( A& C
      modelActions.createActionTo$message
: s; g/ C; P+ p        (heat, new Selector (heat.getClass (), "updateLattice", false));# |) ?# S" W6 b$ f
    } catch (Exception e) {
, `; U; d6 |+ b1 }9 w6 W4 _. U; T      System.err.println("Exception updateLattice: " + e.getMessage ());% w% W. r0 a2 U% u% c% n
    }
( @, d* z1 j* R. i& t        : ]: _! `# ~* Z2 O& x% Q) }! c  q) K
    // Then we create a schedule that executes the; ]  j% g: [6 _6 i/ F
    // modelActions. modelActions is an ActionGroup, by itself it& }- i' i" q: n4 x3 g1 E7 a
    // has no notion of time. In order to have it executed in( x5 [, G6 A% E9 f* F7 v
    // time, we create a Schedule that says to use the7 h8 C. I1 T% L/ a. ^; S% y1 J
    // modelActions ActionGroup at particular times.  This6 u( j9 g! H4 U$ ?
    // schedule has a repeat interval of 1, it will loop every6 k+ d" O8 p, P! M4 N! ?
    // time step.  The action is executed at time 0 relative to2 @" D$ [/ R& F' W7 h3 H4 D1 H
    // the beginning of the loop., j$ @! r. v5 `! o7 L) \* H

3 H+ b" r2 J2 \+ ?    // This is a simple schedule, with only one action that is
( M: v/ c" r4 a* a* S* u% \/ j! o    // just repeated every time. See jmousetrap for more# }/ p# d+ @; `9 A
    // complicated schedules.7 Q, d9 ~" L# D  T6 }7 g
  
* o( r% d) s  @, E: Y    modelSchedule = new ScheduleImpl (getZone (), 1);, [8 L3 x9 m, G& j' K* L
    modelSchedule.at$createAction (0, modelActions);
7 W/ \' X7 Y4 b" y( [  t        
5 D) P6 H6 Q2 g7 Z8 T$ U    return this;
* q! S6 |$ I% f/ ]- M; d  }
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