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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:
: o( J; I+ N% B% B1 N9 W; t+ ], Z
; N. C& x# g  B6 ~4 @$ M public Object buildActions () {
' c1 q: a3 {) E  R    super.buildActions();3 ?! H  K3 c2 }! ^
   
" ^- i; f5 C, F! W    // Create the list of simulation actions. We put these in( C6 j1 b9 K' Q( k
    // an action group, because we want these actions to be9 O% {. x9 H7 o! A; o: m
    // executed in a specific order, but these steps should
' h- _1 c, [/ b8 g4 q7 q    // take no (simulated) time. The M(foo) means "The message4 P- r2 X; g3 r
    // called <foo>". You can send a message To a particular% a, c* d( p9 D& P! h
    // object, or ForEach object in a collection.
$ J# w* r1 R9 Z' M0 L: i        
2 U5 B/ y2 X7 L: O8 @; X    // Note we update the heatspace in two phases: first run; [% T4 y+ f' a6 g" p! s6 }0 J
    // diffusion, then run "updateWorld" to actually enact the; @& r* s5 p7 i, M. V
    // changes the heatbugs have made. The ordering here is: o; y! o1 T' i  i. W( t
    // significant!
6 o  m. d, t/ k        1 c8 @8 W6 v1 D. Q* a
    // Note also, that with the additional- H, |  i% \- w
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
$ ^' Q* ]1 Y( X% k8 U4 c    // randomize the order in which the bugs actually run" f4 y( r2 a7 O7 _. r$ |
    // their step rule.  This has the effect of removing any
/ \" N5 v. R9 r7 Y' c0 x; A$ D    // systematic bias in the iteration throught the heatbug
5 K1 [6 e. \9 h2 i4 t8 b7 [    // list from timestep to timestep! @, I6 q' _. o- d3 x3 T; x
        : H  ?5 ?: e8 P# D, D- z' z3 O
    // By default, all `createActionForEach' modelActions have0 u9 n  I: w! E
    // a default order of `Sequential', which means that the
" y/ u& I$ `9 l% P) r' h8 u    // order of iteration through the `heatbugList' will be) o! t' F  w! H# s
    // identical (assuming the list order is not changed
0 i8 K& z4 ^- z# n& c    // indirectly by some other process).7 O/ R, R  U; A/ }2 `
    4 q! u' q% J6 I, j
    modelActions = new ActionGroupImpl (getZone ());
+ Q/ T# R% P0 a7 L# f' V
( K7 @3 \$ |4 p# ?. a' g) Q& e  q    try {
( a0 z( N- e# ]: ?      modelActions.createActionTo$message
7 H2 ?; z# q6 b  u( f        (heat, new Selector (heat.getClass (), "stepRule", false));
* H8 J/ n* T1 u- s; ?    } catch (Exception e) {
% j9 x( O6 c& e' E# s/ G$ b      System.err.println ("Exception stepRule: " + e.getMessage ());
: F2 i/ X8 H4 }6 V, T! I    }/ o4 R( C' r: O/ }6 M5 d' _
& g2 e: V. n" X6 Y. i; `
    try {. |( k* w9 p* q9 Z0 t. R
      Heatbug proto = (Heatbug) heatbugList.get (0);7 ]' i, a/ ]5 ?) Z
      Selector sel = " r1 W8 ^0 ~0 W& L% b8 k* h! }
        new Selector (proto.getClass (), "heatbugStep", false);( o. W& P! ^4 p2 B9 [9 @
      actionForEach =
  e! L2 W! g" C        modelActions.createFActionForEachHomogeneous$call
7 h4 O$ r$ M9 u0 P  ~, d/ D9 R        (heatbugList,. ]- v* K3 x7 ?, X' _: |6 _: W
         new FCallImpl (this, proto, sel,
/ P- }& s5 ^5 H5 [* b( M+ K- G                        new FArgumentsImpl (this, sel)));
. Y) z0 }, B( M. }9 V) B# T8 R% ~    } catch (Exception e) {8 y7 B0 ?* v- [  {
      e.printStackTrace (System.err);
) k# B( U2 |) z+ y5 e8 j    }
6 f" M4 Q' l9 K) d" M# U    5 T/ c7 }2 t0 B4 v  q
    syncUpdateOrder ();
& u9 o7 h( r/ |7 r  D# ]9 V# v- U. h8 c: w5 T' w
    try {
0 Z7 P: J, D4 l& e      modelActions.createActionTo$message   A8 i  l- [0 K0 U; h
        (heat, new Selector (heat.getClass (), "updateLattice", false));! M; P; J8 ]) @7 d, o& p4 D
    } catch (Exception e) {
* y9 `5 a, H, d# z/ n/ k: A9 h6 C      System.err.println("Exception updateLattice: " + e.getMessage ());
5 ]$ ?$ D$ S9 j8 ~) t    }2 N) B* ~) M9 Q! k) i9 }0 \' p
        
% L# l5 ^) v4 \! C( A" T* o2 O/ H    // Then we create a schedule that executes the  a1 I' j' }4 e* W( Z( u
    // modelActions. modelActions is an ActionGroup, by itself it1 X* @+ g" \7 J) {/ Q: T' ^
    // has no notion of time. In order to have it executed in* g) d' q$ n" A% V8 v9 y+ H
    // time, we create a Schedule that says to use the* x5 _: F, P7 h  y; i" F1 E8 Q2 ?
    // modelActions ActionGroup at particular times.  This
) `9 `6 d9 r! X# Z" p    // schedule has a repeat interval of 1, it will loop every
+ Y/ D$ E0 V! `- x    // time step.  The action is executed at time 0 relative to: H( E  F2 ?5 t# o! a0 [
    // the beginning of the loop.
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    // This is a simple schedule, with only one action that is
8 r, D! c' e. ?" b5 J# }    // just repeated every time. See jmousetrap for more) f/ r0 h, [+ |& R
    // complicated schedules.
: H! h) `1 D: [0 K  7 J) E3 }- P( L0 y
    modelSchedule = new ScheduleImpl (getZone (), 1);" X# C- }$ t- W7 n/ Q& Y3 X
    modelSchedule.at$createAction (0, modelActions);
9 q) K0 O+ V7 o3 g+ |        
& }2 R' V8 G" p: E& r  r    return this;* G5 h) Q& I" Q! q" X$ u1 z6 X
  }
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