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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:
0 R" b# k- M; D; H, ^
; W# }4 |( `% ~1 q public Object buildActions () {
) W6 N* A- ?& P( U% Q7 |    super.buildActions();
5 l* y/ q+ P$ E* ~1 C   
2 b/ h& {2 f* J+ _3 |    // Create the list of simulation actions. We put these in
" g; P3 \6 s* q- i, F" s  D    // an action group, because we want these actions to be
9 p( X9 h4 Z' L# H6 o  X9 q    // executed in a specific order, but these steps should: D6 r* [( g& A7 c; a
    // take no (simulated) time. The M(foo) means "The message
8 u% K1 E5 t( ]% q    // called <foo>". You can send a message To a particular9 `# t; O/ l0 s. i5 v8 X
    // object, or ForEach object in a collection.
$ p, v) B2 M5 x! y2 ?        
$ ~- U( b; b0 m. y: H    // Note we update the heatspace in two phases: first run& w/ C, J9 D; I4 {( s
    // diffusion, then run "updateWorld" to actually enact the6 t' G% W9 n0 M) _5 e
    // changes the heatbugs have made. The ordering here is# D& e8 C# L$ V; R
    // significant!
+ v  V' L" T+ v* b        ( L2 X7 y" i7 M8 ]: c' b
    // Note also, that with the additional; [  q! I6 g/ ]. O
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
7 M, U, u& [0 u) q    // randomize the order in which the bugs actually run; R7 @% l8 m; o6 S. |; h* K& ?
    // their step rule.  This has the effect of removing any
0 y1 U" g$ Y! J+ F4 B    // systematic bias in the iteration throught the heatbug
4 ^7 n' {/ B! K9 R& T7 k    // list from timestep to timestep  o" U6 m4 Y! |& a
        
# K4 z9 F- g+ K1 z5 E; l" M    // By default, all `createActionForEach' modelActions have
2 e* t4 H8 o; @6 Z1 S3 _  v5 n    // a default order of `Sequential', which means that the
' ~) V) T8 w/ w/ \0 Z& n# @    // order of iteration through the `heatbugList' will be- B) V% I5 ?- Q! ^, T
    // identical (assuming the list order is not changed
7 ]$ r  l! D6 ^6 ]1 d# E! g9 `    // indirectly by some other process).
  a0 T. i. i" ]/ x' i1 ]    8 E9 W$ {8 k+ G( y6 h# u
    modelActions = new ActionGroupImpl (getZone ());& {" V/ g: _7 V
( p  d8 p+ I, J' y$ L: T9 v8 H- o( S
    try {
- i& O; L& t4 [, G      modelActions.createActionTo$message$ |+ w8 M1 z( z
        (heat, new Selector (heat.getClass (), "stepRule", false));& w* y+ H- U6 T
    } catch (Exception e) {
$ s8 k$ O& P+ ?1 w: O3 R+ [      System.err.println ("Exception stepRule: " + e.getMessage ());
% a$ c" S* [: j1 |    }1 u0 ^: }1 n$ p
; m  l9 Q% Y" a0 U3 B
    try {
8 ~" K3 V& h$ D  D      Heatbug proto = (Heatbug) heatbugList.get (0);1 s/ x7 n9 \% ^$ C" }, a4 P
      Selector sel = & P0 t! x9 ?. v; _+ w
        new Selector (proto.getClass (), "heatbugStep", false);
. U- M, D+ {7 y+ o      actionForEach =
2 g7 L3 O" W: v4 F        modelActions.createFActionForEachHomogeneous$call. ]% f# U9 ?9 R; L1 T) j
        (heatbugList,
* x( L( \6 P5 t1 y9 G  e2 p         new FCallImpl (this, proto, sel,
1 p- C% P$ R: \6 g! P. a                        new FArgumentsImpl (this, sel)));
6 A7 _) j4 d6 v: L/ K& h    } catch (Exception e) {
4 h6 ~; M: z. b+ {2 A      e.printStackTrace (System.err);% P- x$ A5 @6 ~- F$ A) c! z7 [; g' }8 `
    }% z6 q& ?( {/ }0 E" h8 K  c" t
    % S! F5 ^. @' x% n6 Y. m; T7 w
    syncUpdateOrder ();+ u9 H5 o  U* N, _
+ h1 ~3 [, {) P% P- g: c
    try {
' B/ s9 s5 Q  d6 L      modelActions.createActionTo$message + v6 K( a2 a. |% Y: f. t# o
        (heat, new Selector (heat.getClass (), "updateLattice", false));- d7 c' D/ z9 z9 C- C! b
    } catch (Exception e) {
8 c! k$ `- L7 N1 I2 y! F) z      System.err.println("Exception updateLattice: " + e.getMessage ());
, i% g: B9 O; @4 b+ w" g    }
6 _6 i5 u# T( _  B        - c' ^/ h2 e& Y& H) t! P
    // Then we create a schedule that executes the
0 S4 g! m& i' z) Q4 A7 L9 `) U    // modelActions. modelActions is an ActionGroup, by itself it
. e: C3 x2 o9 S, g2 O    // has no notion of time. In order to have it executed in
1 [" q2 Z! U% g. u  j% M5 z: k+ o    // time, we create a Schedule that says to use the$ [* _2 v9 v5 a3 ~) b( D& O0 D
    // modelActions ActionGroup at particular times.  This
4 {" k  W4 V" ^6 `3 F4 l- z    // schedule has a repeat interval of 1, it will loop every
9 h( q2 Z9 r7 ~( b) Q  t' m- E' i    // time step.  The action is executed at time 0 relative to
; y' V/ p$ r) R& {# _    // the beginning of the loop.2 _2 z3 g% S" d( B& b: N
; p. a( h- S+ [# D& D' O4 m
    // This is a simple schedule, with only one action that is
5 J# ]8 s& t" {( D    // just repeated every time. See jmousetrap for more
+ z" a! i. o: Q& N8 [+ T    // complicated schedules.
% i1 O9 `: U* w3 g1 K  
$ z! C9 ?# d! \$ J    modelSchedule = new ScheduleImpl (getZone (), 1);( G4 @* ^+ i# s$ {3 O! ^0 [
    modelSchedule.at$createAction (0, modelActions);
5 N- K- q& R) N) C4 Y        
2 ?3 A% y) T, N6 V2 \" u; d: t    return this;
* H2 k; e0 b9 ^; N% N  }
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