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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:: w2 S1 c7 F4 B5 x0 L- ]! O# z
  C2 `- ?+ D6 `" I# [8 p
public Object buildActions () {: @. s% a/ o! w4 W/ J
    super.buildActions();
# F3 o5 n5 X, X) F) S   
; N/ v7 a2 k+ ~" F/ w  n    // Create the list of simulation actions. We put these in
* u$ [# E6 J, v- H' S) N2 n2 z, ~    // an action group, because we want these actions to be
% j7 S# E4 ]: E8 `# y$ o! k    // executed in a specific order, but these steps should; |) I& b) l  O9 _
    // take no (simulated) time. The M(foo) means "The message! A+ d/ m# d* p) x3 m+ G4 Z
    // called <foo>". You can send a message To a particular
6 s6 c# I, D. u    // object, or ForEach object in a collection.+ `. w# w- w# T) R: }4 Q% v
        
2 a$ h! V1 a* b% J) V    // Note we update the heatspace in two phases: first run& B3 k1 \( D: W! R0 V9 G
    // diffusion, then run "updateWorld" to actually enact the! Z. y5 `% ?  M7 r$ G) \8 \) g
    // changes the heatbugs have made. The ordering here is8 W! U2 a; c% z& w0 b% D+ M: ?9 ?
    // significant!. r/ _( A# N# b, a/ a
        6 O* L/ l# T' `( _- }+ d9 [4 k
    // Note also, that with the additional
" L* L3 L, [: a* i( y    // `randomizeHeatbugUpdateOrder' Boolean flag we can; z- r" b; G- A
    // randomize the order in which the bugs actually run( p+ X$ `5 C* ~5 p9 `
    // their step rule.  This has the effect of removing any
! g+ H$ q7 p- }+ v1 c    // systematic bias in the iteration throught the heatbug0 K2 f6 F/ z# e* C
    // list from timestep to timestep
7 o4 I- b) X0 Q% s% z7 |2 H0 P  b1 K        4 G2 D7 v, W+ F$ L" B% T6 D
    // By default, all `createActionForEach' modelActions have' m1 T8 [' I/ Q, {, M
    // a default order of `Sequential', which means that the
' k1 i0 I2 T; t8 |* ]' _5 C    // order of iteration through the `heatbugList' will be/ A- a7 F( A7 T# x# [  f6 Z
    // identical (assuming the list order is not changed; d- v& J! a  h
    // indirectly by some other process).
5 ?6 d) p( a2 _% n. {9 ^   
0 w: Y5 e- a1 ]; J    modelActions = new ActionGroupImpl (getZone ());7 h0 b: O' Y( o; P0 Y* C
* f1 A9 B& @* ]( {* X; M% {' a
    try {
( N. G1 J( v8 x! V8 i# {( k0 }1 j! W      modelActions.createActionTo$message
8 @) s' }, c4 w        (heat, new Selector (heat.getClass (), "stepRule", false));
3 _. A2 R" j8 D. K$ J% X* ?) R. k    } catch (Exception e) {
1 x7 Z3 G& P- B9 D$ G      System.err.println ("Exception stepRule: " + e.getMessage ());
. s# X. G! P' W: F    }. _1 @) O) Q. K/ h& k: C

8 L3 L, d& N7 U+ @    try {
# |- K7 E( l2 A+ V" T% F. S      Heatbug proto = (Heatbug) heatbugList.get (0);& L* W% b5 U: g' P
      Selector sel = 8 [; W  @5 w& s) n5 U' A
        new Selector (proto.getClass (), "heatbugStep", false);
7 r/ M" R- s5 s8 t! P      actionForEach =
6 S. X- \4 W* o        modelActions.createFActionForEachHomogeneous$call) r/ g% E: b# w
        (heatbugList,& u3 J. v6 ~* C6 r- D7 G- e
         new FCallImpl (this, proto, sel,# c2 T: C& g+ V5 m2 C) \9 p
                        new FArgumentsImpl (this, sel)));
( L: D) }8 v; `    } catch (Exception e) {% I( J. x  {4 c; ?4 p
      e.printStackTrace (System.err);: r6 s! H. C0 L: W8 ]( O
    }* w, q1 m; y* P  ]$ [4 y+ ^" b- b
   
; C! R& ]' b! j6 b% T" a* q    syncUpdateOrder ();
7 q, j% D! Y% r, V+ j) r4 K8 S7 v
    try {
  D, n1 i! t! ~& \      modelActions.createActionTo$message
2 Y6 r+ ]) M. a7 ~; g: }- k. _        (heat, new Selector (heat.getClass (), "updateLattice", false));% Z1 }, F1 O& c8 k" P
    } catch (Exception e) {
& j. f" q1 t' h( a# p: _7 t. I6 ]$ E      System.err.println("Exception updateLattice: " + e.getMessage ());
% A0 R, l. A! b    }8 w7 g5 c' M, A5 h- H& {
        
# V: E% m9 G. _  m4 ?/ B% \+ U% d: `3 i    // Then we create a schedule that executes the: c5 l( M7 T$ B8 f
    // modelActions. modelActions is an ActionGroup, by itself it* ^7 @; h$ B2 k2 ]& o& S; Y
    // has no notion of time. In order to have it executed in
& A+ _: U: N2 L# E# ^7 U1 i5 G- H    // time, we create a Schedule that says to use the
- ~0 s: Q; g$ R% |/ z& B" s) s    // modelActions ActionGroup at particular times.  This* _' `# ^/ p) G0 U
    // schedule has a repeat interval of 1, it will loop every
' S" r; N/ u/ n  j% Z    // time step.  The action is executed at time 0 relative to
( r0 B% ]. ^: J* J  O. o: K    // the beginning of the loop.1 v# U& y( q1 W! U) L+ e+ d5 _
3 D& U% H" X' y: F6 {5 W0 M5 }
    // This is a simple schedule, with only one action that is* n$ [0 v. s1 [3 N) Q
    // just repeated every time. See jmousetrap for more
% [- [6 \4 V% I. T2 Z+ u    // complicated schedules.
% W2 N1 ~2 {; ?$ ^4 t2 I  - |! f  H8 L6 B
    modelSchedule = new ScheduleImpl (getZone (), 1);
( W# ^- ?( W& k; t, J    modelSchedule.at$createAction (0, modelActions);
* u: ]# U+ {4 W: ^$ q4 J" q        & d5 N; |2 j+ c# w. C
    return this;) c" ~6 \$ `) H! G. n
  }
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