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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:
4 y) w, [3 V* U0 ?) \% Q- E* j8 \' l9 \& C/ f! V2 @5 o
public Object buildActions () {
+ I5 F- W* q- [0 c3 P    super.buildActions();
  [+ J3 f) P, ~/ ~2 y5 F    ' U! n* A0 F0 B; m; j0 a+ D; a
    // Create the list of simulation actions. We put these in
+ O& l: E+ ~1 ?/ V& \/ z4 ^* v    // an action group, because we want these actions to be
8 l! y1 D$ k- _- D% u    // executed in a specific order, but these steps should* U: w6 q. \, j, _
    // take no (simulated) time. The M(foo) means "The message
. y# N) e* J, _5 z    // called <foo>". You can send a message To a particular
2 j  R# H" m3 j2 p5 U* E, v    // object, or ForEach object in a collection.5 z: N! Y! F; I& N1 X
        ( g0 l" T. p2 _' h+ y4 r/ x
    // Note we update the heatspace in two phases: first run
( {" }, B  m1 a0 w! y9 x7 }5 J    // diffusion, then run "updateWorld" to actually enact the
: ?, }) u# z! s8 ?( }2 I8 G    // changes the heatbugs have made. The ordering here is
9 _, f  t# C9 T: M! ^* d; P0 {    // significant!
$ P$ N- q6 f5 f% O9 _' H        
! B3 ], u; H  }; p    // Note also, that with the additional
+ P: y/ z' Q/ i  v    // `randomizeHeatbugUpdateOrder' Boolean flag we can) q% t3 Y7 {+ _' A7 e3 Z  l+ F, X4 e5 P+ O
    // randomize the order in which the bugs actually run* m, \" C, j% B: \" X, Y
    // their step rule.  This has the effect of removing any( |6 l6 r3 Q4 |) W9 F. V4 _& U
    // systematic bias in the iteration throught the heatbug
0 h+ Z; J, @5 B3 u8 K1 d4 d9 n    // list from timestep to timestep. O, ?- }8 j* w. B- h  [+ Y# `
        
9 O! v% V. p$ L6 A, G/ Q2 U    // By default, all `createActionForEach' modelActions have
+ t0 F4 d0 c6 ?9 L+ g' K  a    // a default order of `Sequential', which means that the
7 z: a+ b* Z* Y1 M9 t& H: L2 A7 x    // order of iteration through the `heatbugList' will be2 D  }+ W. r% e  T! b# Q6 g, }
    // identical (assuming the list order is not changed
# l: ~8 a4 u/ d& U1 G    // indirectly by some other process).+ |6 {. u& D  O0 m# H
   
5 e& h; T$ m' V+ F) J7 l1 y* z! t    modelActions = new ActionGroupImpl (getZone ());
& n& ~* N( e" f7 A
& g$ b: C3 G( b" K$ I- k# i! Q/ m    try {2 r( ]* |4 O/ Q5 z- q  {8 G: V6 M
      modelActions.createActionTo$message% e! e/ K- n* c
        (heat, new Selector (heat.getClass (), "stepRule", false));2 ]6 ^) J' J+ o7 F8 W1 T
    } catch (Exception e) {) k+ p( A% d( E4 A5 W) L3 c" E
      System.err.println ("Exception stepRule: " + e.getMessage ());
* H8 @1 H( t. B1 q/ [8 Q    }* I, J+ w+ ~8 [$ {% d  @. Q4 |

7 b% C7 k4 E# F$ x4 L/ i  S    try {/ |( s/ x* Y4 l" q3 f
      Heatbug proto = (Heatbug) heatbugList.get (0);
6 W: j' n& V3 T' ^4 G9 t. [7 R      Selector sel = . `6 }8 `+ W% f# r3 s1 [7 F9 M- ?
        new Selector (proto.getClass (), "heatbugStep", false);
3 u7 Z. E0 ?" O) I* r! ^  }      actionForEach =2 D: r- L' c# I$ |4 g" ?! I$ T, b
        modelActions.createFActionForEachHomogeneous$call
- [. T3 U4 A# Z5 B2 v/ \        (heatbugList,1 j5 `1 z( g$ M% ^. I
         new FCallImpl (this, proto, sel,
% Z7 e1 ~9 x  Y: R7 S                        new FArgumentsImpl (this, sel)));
  j1 l( O* {/ c    } catch (Exception e) {
8 B# T6 w# M" {4 C      e.printStackTrace (System.err);
: n8 V' P1 h+ W5 F; m    }
  b' {, I2 X! ]/ J; f  v/ N    * v+ [$ `% f- \' Y5 E/ S
    syncUpdateOrder ();5 j& q' h6 a6 r- H) w
/ |: s: d% x# O" i# C6 W% E7 B/ h! C, P
    try {  a2 W, M/ ?2 L2 [: m1 b2 K5 i% C
      modelActions.createActionTo$message ' g1 m3 G) m% |
        (heat, new Selector (heat.getClass (), "updateLattice", false));
# ]$ Z1 r3 J: b; e9 J% d    } catch (Exception e) {
7 M8 E" n, [! L0 y      System.err.println("Exception updateLattice: " + e.getMessage ());1 D2 w3 {  Z" m! ~6 v- E
    }
4 X# z! R/ J# v4 d5 t' J        
4 k& J: n& E1 L% m2 b, T* u) |    // Then we create a schedule that executes the
* n6 g* M) g4 w; K1 _' W    // modelActions. modelActions is an ActionGroup, by itself it
2 ~2 x% D$ T2 f5 m    // has no notion of time. In order to have it executed in
3 `1 n/ d, h6 ]! I7 s( `    // time, we create a Schedule that says to use the
' d: s* a0 F6 S; S! L3 {    // modelActions ActionGroup at particular times.  This, x  z4 E: I( X6 p9 d  f4 d
    // schedule has a repeat interval of 1, it will loop every3 L% t  A; a$ X3 g/ ?
    // time step.  The action is executed at time 0 relative to
4 T2 x: C6 n2 o% z2 s    // the beginning of the loop.: F' F- ?4 [' g, X7 j
" T& O& Y/ x6 U: _/ M# |
    // This is a simple schedule, with only one action that is- t  f: H: j+ F( j, {# ~
    // just repeated every time. See jmousetrap for more% r/ h% E7 h# m% ~" t5 W  c
    // complicated schedules.
2 N+ l) m" c& H4 {$ e$ C  ; @+ j9 g* C- Y/ ~- N# G
    modelSchedule = new ScheduleImpl (getZone (), 1);
8 ^, I0 N$ m9 \9 c    modelSchedule.at$createAction (0, modelActions);; q/ [7 s( }9 [, ]4 P  B
        . L9 q9 {9 D% A
    return this;
+ F0 D5 i9 S) j* x  }
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