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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:" P* x0 g/ B2 y% x! Z# h4 z( E. K

# z# ]( d% C% W public Object buildActions () {9 P8 T: g4 y) Z8 T2 u1 v, a2 c; B
    super.buildActions();
7 E7 p# u3 B3 D; r   
1 b7 g7 O9 s4 E; A* Y7 E$ c    // Create the list of simulation actions. We put these in9 I& w  d  `! q! @6 ?
    // an action group, because we want these actions to be
( q  V' h3 i3 Y2 r0 P1 s    // executed in a specific order, but these steps should6 f5 S# O5 g, M# N6 J
    // take no (simulated) time. The M(foo) means "The message. P  a* s$ k+ G) g5 b
    // called <foo>". You can send a message To a particular' q# u- p* e- c0 v' B" g' M- X
    // object, or ForEach object in a collection.
4 p% L" C. U! A5 R+ x( i        
7 q$ ?4 v9 ^: G( T    // Note we update the heatspace in two phases: first run6 O7 J: R8 r  ~5 e5 _# a& r8 J
    // diffusion, then run "updateWorld" to actually enact the
* r. I6 [9 k5 [+ U+ N) j    // changes the heatbugs have made. The ordering here is
& W: p' b7 o+ k    // significant!
: U% \3 e  P* R, }4 n/ Y1 x        
* Z/ D+ Q4 a7 g6 ^    // Note also, that with the additional5 j3 H  `, u  p) `7 S# d1 J# f8 L" p& I
    // `randomizeHeatbugUpdateOrder' Boolean flag we can" ?3 C- I$ U: E/ G" z
    // randomize the order in which the bugs actually run
0 \+ e2 {# L' B( ^* y. z& o    // their step rule.  This has the effect of removing any' R, R9 T1 c5 i7 C
    // systematic bias in the iteration throught the heatbug  w0 c7 ~4 r% N$ a9 k
    // list from timestep to timestep
& B7 y% w. V# K  w! S( q. |* V8 z        8 p' v8 V  s: d0 J2 \
    // By default, all `createActionForEach' modelActions have: k- x- f+ G5 i8 `
    // a default order of `Sequential', which means that the2 G  y+ h2 l" m7 }* z  E. k- H
    // order of iteration through the `heatbugList' will be
7 L: u. j+ t! x3 P; p6 S  G# q    // identical (assuming the list order is not changed
6 `. ]  U' x2 P( a1 Z' ]5 q" ~+ D    // indirectly by some other process).
2 K7 g9 s! l8 e# T' m7 e+ }    , B- p! F% [. W4 i; ?
    modelActions = new ActionGroupImpl (getZone ());0 Y3 s, ^- e9 ]- X8 Z# H
+ g+ c  }' q8 ~) T( g2 O5 o8 @
    try {
" x# `, R; q% |2 ?& X7 l2 f" l      modelActions.createActionTo$message- x! w! ~- {' l0 E: z# c
        (heat, new Selector (heat.getClass (), "stepRule", false));
2 J2 B7 M' r  X+ L5 l/ ~/ l    } catch (Exception e) {
7 w. c( e) @2 v6 U1 T2 Y      System.err.println ("Exception stepRule: " + e.getMessage ());4 y" l8 `; P7 V5 N8 M
    }  `$ t+ f' T" c9 I: ~9 N
7 `1 J* k7 o; {: C
    try {
+ ]" Z( S% L; S. ~      Heatbug proto = (Heatbug) heatbugList.get (0);
8 J1 M8 `+ w8 X) I+ R      Selector sel = - g( S: m& x& c' `1 s* L. o; N3 g5 e0 C
        new Selector (proto.getClass (), "heatbugStep", false);6 e5 L( D1 o3 `- Q
      actionForEach =2 `9 ~  U# Q# w) s0 B0 W4 P
        modelActions.createFActionForEachHomogeneous$call8 i  C' V( O+ N+ n# a; X
        (heatbugList,
) r3 H0 v4 f, _1 E         new FCallImpl (this, proto, sel,
1 ^2 Y6 _, |: Y2 |2 t& t. ~) {. m                        new FArgumentsImpl (this, sel)));
& U3 q3 Z7 O6 ^" {; t    } catch (Exception e) {- Z  I( P+ C8 ^% h3 U* p; ?# Y* Y$ c% ~
      e.printStackTrace (System.err);" j5 T1 n' Y% x& F- p
    }1 b; x( r2 b4 W* b4 ?0 W
   
6 e4 ~, {( N& u5 ?6 S    syncUpdateOrder ();+ d+ R$ E8 n. O# h/ J. j
3 n6 p- ~3 M% E4 Y2 M- I+ |- v
    try {- u( p* k0 p) B' n- x; Z
      modelActions.createActionTo$message ! S( A$ N9 l; U' s
        (heat, new Selector (heat.getClass (), "updateLattice", false));
, a; k5 J! u" h" q% T' G    } catch (Exception e) {
* l- b: x- Z5 b7 }; P+ s, B      System.err.println("Exception updateLattice: " + e.getMessage ());
0 F$ u+ ~* h1 H: @3 g2 b    }. ]+ c/ T3 ^! z
        : K- ^3 w; Y; B' r
    // Then we create a schedule that executes the) c5 l9 O( Q: x
    // modelActions. modelActions is an ActionGroup, by itself it
! S3 p. B; O7 }4 v    // has no notion of time. In order to have it executed in
/ C; G% o8 u* u$ h    // time, we create a Schedule that says to use the
" I: s" r) {+ u, z4 V: `    // modelActions ActionGroup at particular times.  This
8 y* @/ P$ D# ]3 e    // schedule has a repeat interval of 1, it will loop every
) G+ {' Q& X" c6 B1 Y3 V, M3 S    // time step.  The action is executed at time 0 relative to
6 [1 S3 }5 ?( w8 f$ k8 l. |' a    // the beginning of the loop.8 k: M; f$ [$ U

# R0 R4 _+ c7 }# z    // This is a simple schedule, with only one action that is8 z! S# [0 c2 i. z. |% r) E# e
    // just repeated every time. See jmousetrap for more
7 A8 E0 f( H2 I; [: l9 \, X    // complicated schedules.
- R! ^: P8 o% C4 I  
! X9 ^; z1 \/ i& ~    modelSchedule = new ScheduleImpl (getZone (), 1);
" C  w8 T# q6 _  w# @- v4 Z    modelSchedule.at$createAction (0, modelActions);" ~! T3 ]( F9 W; f2 v
        
: C/ }) B# L% J, F    return this;# ]" |6 m( I7 \/ ?4 w7 R
  }
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