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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:
1 G' ~5 F6 _# S# m0 L6 P) {1 M& z" d. u& t
public Object buildActions () {
2 m, J, N" o7 P) p: V' n    super.buildActions();
# w0 H5 F/ c7 }    ! D& l3 ^7 `2 R5 K$ a" f
    // Create the list of simulation actions. We put these in5 R% p1 r8 d* R
    // an action group, because we want these actions to be, H! t# M: J9 }
    // executed in a specific order, but these steps should
( l. w8 Q! g9 O) J    // take no (simulated) time. The M(foo) means "The message
( B& i* g( w+ b- R    // called <foo>". You can send a message To a particular
, m; \6 h( K* ~5 F3 {# _# ^3 V% w    // object, or ForEach object in a collection.
% _/ H% F  ?$ s' v! R* O7 @        + C" ]$ }+ E1 c# `4 }
    // Note we update the heatspace in two phases: first run' V& P5 S* I$ P! B6 Q6 q
    // diffusion, then run "updateWorld" to actually enact the* _; F" \' S! D2 m, j* G
    // changes the heatbugs have made. The ordering here is- }$ u7 z) d' G; }
    // significant!
3 b6 ~2 B  V$ {% C! \% k        
9 v" @& O- v; b! p9 |' K    // Note also, that with the additional+ A/ |. l4 g- X$ R; |
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
* B$ |0 W" I2 z* G# U, C: B7 I, W! q    // randomize the order in which the bugs actually run
# Z$ O& Z% ^4 t1 n  z    // their step rule.  This has the effect of removing any
% B7 V$ H* Z) L! d; P; w! |    // systematic bias in the iteration throught the heatbug& T+ `& p& R0 v' A* a; |
    // list from timestep to timestep  p9 }; e$ |! F) k% L& Z8 Z
        ( i+ v8 w+ \) j1 Z$ Z* L) E2 X
    // By default, all `createActionForEach' modelActions have6 a' c! A) m6 {1 X2 T6 B# }* a
    // a default order of `Sequential', which means that the6 ]; d! Q' x" c+ T  \; U: O) s
    // order of iteration through the `heatbugList' will be
) M; v* [+ z# R0 A: d    // identical (assuming the list order is not changed" e( }5 P, I/ n. z; r% r
    // indirectly by some other process).
. j  c- ^& m: ^3 a    $ I4 W1 o! t( e  m  P) d5 X
    modelActions = new ActionGroupImpl (getZone ());# u9 j+ c* z2 `( T

; }6 @9 `3 |6 D0 J1 F- O    try {
+ U& j& ]* Q! U1 U" d7 F; E      modelActions.createActionTo$message) E8 ^# ~" y  s
        (heat, new Selector (heat.getClass (), "stepRule", false));- L% C9 A* O7 j+ Y: z* Y/ e
    } catch (Exception e) {
9 }3 l6 U' p' m* p      System.err.println ("Exception stepRule: " + e.getMessage ());9 s9 w3 H1 B5 L/ b: ]
    }' I+ j" o" d: K" D* i/ k( P: w
3 @) Q5 A* b$ X2 [% a
    try {
6 ], X2 x# k, g3 w7 v2 I      Heatbug proto = (Heatbug) heatbugList.get (0);
$ A9 O, D) W/ A: [5 e9 h7 _      Selector sel =
: Z8 y2 r& n$ s! Q8 {        new Selector (proto.getClass (), "heatbugStep", false);: b& f+ s) j' ^3 o& P' z! }
      actionForEach =
- {8 T6 m: q9 f/ T0 Y, [6 I! S2 s        modelActions.createFActionForEachHomogeneous$call
/ D. Q" M5 G3 @4 ~4 K        (heatbugList,: Q1 A; s9 q& e5 F& z
         new FCallImpl (this, proto, sel,( O* v* t! _: q  u; U& M. W6 c
                        new FArgumentsImpl (this, sel)));' }" Q, X; |/ P
    } catch (Exception e) {
( l8 o  V; r8 P: S, @/ S% o      e.printStackTrace (System.err);6 T% F8 g2 w6 {# S
    }2 T( A, N0 K* g. B8 `" W9 _0 S+ I
    0 s* P! W% G: i0 U  W$ ^
    syncUpdateOrder ();
7 Z' M6 c+ y* j% [) I  q7 @1 e1 ]. e3 }+ I+ [( D) Q
    try {
$ l+ G9 l" e9 {  q, j      modelActions.createActionTo$message
. G( e: `% G7 K        (heat, new Selector (heat.getClass (), "updateLattice", false));
: ~$ \, R/ V% j1 a    } catch (Exception e) {3 E% ^8 D/ g2 M
      System.err.println("Exception updateLattice: " + e.getMessage ());
7 r1 M' E3 {6 o) _  h( M    }! a/ p! V; k4 x& N4 \  ]
        
: f+ P! C% `1 v    // Then we create a schedule that executes the
* l$ o( l1 s% k6 ~: P    // modelActions. modelActions is an ActionGroup, by itself it* {2 H( _( G; t
    // has no notion of time. In order to have it executed in
( c5 w% A% d7 `5 O: x: j# Q    // time, we create a Schedule that says to use the
: n" D8 b3 m! w( N# ~    // modelActions ActionGroup at particular times.  This+ G' [( L6 |. v
    // schedule has a repeat interval of 1, it will loop every
( O5 D7 }( `4 y. L. q. ^# I, |5 f/ x    // time step.  The action is executed at time 0 relative to5 D* h  v3 s9 e! M# _- C
    // the beginning of the loop./ \# P' B8 ^0 X

& q/ k! D/ [* y8 i  a    // This is a simple schedule, with only one action that is8 V# t, r9 T' T" T) z& L, U3 w
    // just repeated every time. See jmousetrap for more
  |& I! q/ H; H7 m  ~    // complicated schedules.
0 L# x6 y0 c- [  B  
. W6 D1 K: t; K4 C$ o% a    modelSchedule = new ScheduleImpl (getZone (), 1);
9 I4 n% e, F( U5 `    modelSchedule.at$createAction (0, modelActions);
+ p! Q# h8 C2 n% n: ^. {        
* `0 i9 J" ~1 A* z8 v    return this;/ ^  T6 s& v; E. J/ H9 S) A
  }
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