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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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: ^% f; Y  D0 C3 h- t+ {, x& g public Object buildActions () {$ }% J8 D! I; c: u5 Y( C6 H
    super.buildActions();
8 K$ A. J! I9 Y) [    ; w! C# Y" Y- ]7 y* \
    // Create the list of simulation actions. We put these in0 {2 G5 ~) x( P; s& L3 Z) Y2 H
    // an action group, because we want these actions to be
$ y1 D: T: _8 C* P: a    // executed in a specific order, but these steps should% a, D, \& g; [3 @$ M% S
    // take no (simulated) time. The M(foo) means "The message
/ _) I1 j  N$ c5 E' S( N- W' G    // called <foo>". You can send a message To a particular
4 c2 ]5 o1 T# C* q, r    // object, or ForEach object in a collection.6 r/ M, }  C4 }9 V
        
. \( f; L7 B0 Z) L! G    // Note we update the heatspace in two phases: first run
$ U/ [# H4 H9 M- O$ q# V6 H- {* Q    // diffusion, then run "updateWorld" to actually enact the
: K* E% f9 U0 ?3 F! l    // changes the heatbugs have made. The ordering here is
4 i$ X8 {3 |8 k) g3 H3 I7 ^( h/ p    // significant!% I8 G- J4 f  V7 ?% L
        
/ a% w$ `6 \' q( Z; {    // Note also, that with the additional; {+ C& J# {+ ~. `: N. g; u
    // `randomizeHeatbugUpdateOrder' Boolean flag we can! a2 T+ K" ~! r2 ~. {+ ?
    // randomize the order in which the bugs actually run
' d+ y% ?8 ]8 R( e% ?    // their step rule.  This has the effect of removing any8 v6 G) f% Y- X7 t: r
    // systematic bias in the iteration throught the heatbug8 l7 o' @# ?! A# j& O1 h
    // list from timestep to timestep, _5 B# c2 e7 ]# ~2 s* i
        " S  ]/ S) s* I4 p9 z
    // By default, all `createActionForEach' modelActions have' t0 P3 R& z$ J# I: V+ `5 [
    // a default order of `Sequential', which means that the
1 |& R8 j* ~+ e0 C7 M% j5 ?7 X6 q    // order of iteration through the `heatbugList' will be
' o; C# i" \1 Y. D. ~    // identical (assuming the list order is not changed
2 k) L; w/ m* ]" ~    // indirectly by some other process).5 X) f+ J; g& Y% o: N
    $ {0 O7 v7 {+ i( C3 i' _$ F- y
    modelActions = new ActionGroupImpl (getZone ());
1 i* }$ u& Q4 w
9 j* j  u/ j+ W    try {
; _, G4 T. t5 N* n      modelActions.createActionTo$message5 A: _8 @, X0 R; e" b
        (heat, new Selector (heat.getClass (), "stepRule", false));: e1 N) R4 G" |
    } catch (Exception e) {! P7 i9 Q+ Y5 D' P7 \! B' a* \
      System.err.println ("Exception stepRule: " + e.getMessage ());
0 W; a) N$ g! k8 D* S    }
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& h+ ?' @& p( d# w& X/ }& o    try {
! X1 b. i' Y5 o2 L6 A8 g      Heatbug proto = (Heatbug) heatbugList.get (0);! P' I9 Y/ w( }+ a4 t( _, e
      Selector sel = % F: c0 a7 b! \. K& _- M
        new Selector (proto.getClass (), "heatbugStep", false);& Q7 v; g+ b8 _% _" b
      actionForEach =" v" X4 x+ U; m- h' A  c6 b, v
        modelActions.createFActionForEachHomogeneous$call
6 Q/ h3 L: X4 `  d/ S        (heatbugList,8 V+ ]& D$ g, q/ _  E
         new FCallImpl (this, proto, sel,' v( I% N+ N( s. E0 @
                        new FArgumentsImpl (this, sel)));* ^0 P3 I" A/ D, ]# v: {
    } catch (Exception e) {4 v- G! \: R! `; n" y
      e.printStackTrace (System.err);
; k" m7 P* N, ?4 b+ ~; D    }, V2 `; x0 U" k+ T0 L& O7 d
   
: Z4 P. o$ K$ P6 X& D    syncUpdateOrder ();
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$ G* g1 S& n; l6 W& b    try {/ l7 b3 ?8 z; M7 m& P" ~
      modelActions.createActionTo$message
& E6 T, q" M/ K1 U( h        (heat, new Selector (heat.getClass (), "updateLattice", false));- p$ L' L: S' q% p7 O( l
    } catch (Exception e) {
8 V5 Z1 L$ D4 p1 j/ y  \6 i) I      System.err.println("Exception updateLattice: " + e.getMessage ());1 ~* y' z9 ~$ X: h8 u, r+ d9 [
    }; W2 d) D" V! z. W+ _8 D  Z4 B# ?
        5 Z# K8 |3 @9 L5 N- B' U% f1 m& T, u
    // Then we create a schedule that executes the4 w) h! q% o: f; O+ j9 g# ?
    // modelActions. modelActions is an ActionGroup, by itself it5 `; G% l  Q: I3 J5 \
    // has no notion of time. In order to have it executed in
9 ~/ F3 |7 m2 ]* e; L# R. C& `- b    // time, we create a Schedule that says to use the
) O  c7 O, n6 S8 y* ~/ l- p    // modelActions ActionGroup at particular times.  This1 s& x3 i9 H1 P4 ?. I( j% j' ~
    // schedule has a repeat interval of 1, it will loop every( s4 g+ A& H  j3 W9 u
    // time step.  The action is executed at time 0 relative to
* P& U1 p1 ~9 ~1 v, P    // the beginning of the loop.
, l( Z5 n! j6 m- K" `9 H+ \: t
$ v5 O) m& S+ Q: r    // This is a simple schedule, with only one action that is
$ d# L% V. G3 ^9 X- F    // just repeated every time. See jmousetrap for more( a3 W" o$ Z' g" T6 a+ _
    // complicated schedules.- B4 Y% |  L% h1 j2 T+ D2 a1 \/ ~& Q
  
' j' |1 T  V  y$ x5 R    modelSchedule = new ScheduleImpl (getZone (), 1);
" U" C9 D- \. n; K0 Y4 ^0 g) f    modelSchedule.at$createAction (0, modelActions);7 m$ j% t. i% }
        + @$ k0 a/ m. {# s$ V0 h
    return this;
4 i+ q% D- v* R! r# k- [: ]3 Q  }
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