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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:9 A( S0 P2 s$ k- Q5 j

, p$ }& L8 a: z" T% z public Object buildActions () {+ t$ I8 W: {  R" g
    super.buildActions();
3 ^5 R7 p! g* p+ ]    2 T1 s* j! |" o; ^# D  c
    // Create the list of simulation actions. We put these in4 y4 Y% w4 c! x( ~
    // an action group, because we want these actions to be
% W- Z9 G# N/ j0 }# ?- F    // executed in a specific order, but these steps should) Q$ B* w4 N  L: a
    // take no (simulated) time. The M(foo) means "The message" N2 g5 L" y1 ^2 U& R9 g) q. d
    // called <foo>". You can send a message To a particular$ u' @# d8 L. E5 h
    // object, or ForEach object in a collection." J, y; [$ m1 ^* o4 ^5 \0 a
        
: \: b- J. O; @9 h/ b6 r    // Note we update the heatspace in two phases: first run- G( ~1 N3 F8 [1 Q0 M# T, ]
    // diffusion, then run "updateWorld" to actually enact the" v! z) M* S  @3 m! q
    // changes the heatbugs have made. The ordering here is- @5 T7 q4 d' h8 b
    // significant!
4 a" F. ~+ _' g        2 z/ b3 b  g% k, l" }7 [! k
    // Note also, that with the additional/ @7 j$ P2 k! Y( C. ?$ X6 r3 ]5 ?
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
3 _" N2 Z+ M' b4 {0 K, K" n    // randomize the order in which the bugs actually run
0 U6 k6 J5 _) G9 B0 ]    // their step rule.  This has the effect of removing any6 M1 t) ^& {* t6 w2 X3 z0 `
    // systematic bias in the iteration throught the heatbug, k, |6 B5 _! r1 M/ t4 X) j
    // list from timestep to timestep1 ^: q: J2 E$ R. a0 P
        1 P4 V9 K; Y$ w% `. ~' d2 b7 y
    // By default, all `createActionForEach' modelActions have. h! s: P4 }6 P
    // a default order of `Sequential', which means that the
1 Q) C& I1 M# Y" @; }5 V8 Z    // order of iteration through the `heatbugList' will be6 |8 e) S8 ^1 ], q
    // identical (assuming the list order is not changed
$ S/ e) L  D, L' B% Q! _& i    // indirectly by some other process).
. c' v( q) T) e" d' D% }    0 V! {+ ?( E9 o% \3 r
    modelActions = new ActionGroupImpl (getZone ());/ a7 [6 ?) G, {5 r* \/ M

1 |$ I; k  _0 d$ M  @# g    try {
2 _9 N/ R+ G. k2 n      modelActions.createActionTo$message7 ~7 ^& f8 C) H: I
        (heat, new Selector (heat.getClass (), "stepRule", false));
* w) ~3 E1 L+ D" a8 N- J    } catch (Exception e) {
; L3 ~) F* f3 v) f      System.err.println ("Exception stepRule: " + e.getMessage ());
: z5 t/ }$ Z& _/ N* {. B    }
+ \4 G- f& I1 O: y6 b$ X% g3 A1 \) h9 \# Z
    try {+ P: d' [; [; u: s0 m  [
      Heatbug proto = (Heatbug) heatbugList.get (0);$ C: ]: R: t' {; P
      Selector sel = 9 [& n" M0 F6 ?9 q: h8 U
        new Selector (proto.getClass (), "heatbugStep", false);
0 _6 U4 f# N0 D9 B      actionForEach =
' d: h0 r4 C6 h, I9 _* l" W! W' b        modelActions.createFActionForEachHomogeneous$call
2 f0 u" s3 N  ~  J7 ]: L& n0 u        (heatbugList,
* Z' w. B+ O& `& ?0 P5 Q4 b4 Y         new FCallImpl (this, proto, sel,
) C0 W7 q6 h" f8 z3 G6 N* X                        new FArgumentsImpl (this, sel)));
5 r" I! @; w/ o8 T4 W, ]    } catch (Exception e) {
6 v% Z* U$ `) Q7 f7 t1 V6 I      e.printStackTrace (System.err);
, [' A6 t3 k% `7 D    }) L- W, B  j5 q6 j7 i- s
    ' H4 H$ n0 i  B4 m5 A; {  }/ n1 K
    syncUpdateOrder ();
& t% d! u( o  L7 ?  n
1 @! }3 X& ~* T& o    try {0 s# w) d2 F5 M& W6 c: n
      modelActions.createActionTo$message
. R5 P( K( E/ A  y3 L" q( Q' |0 H        (heat, new Selector (heat.getClass (), "updateLattice", false));
9 I" K$ u, V5 x  }( v+ d    } catch (Exception e) {
3 D: t2 ~% P* g) V" n( K8 u      System.err.println("Exception updateLattice: " + e.getMessage ());# q" f# R, w( s1 p" C  {  w; d
    }3 G, k3 ^( m! M1 t9 @6 R
        , A% M2 ]( r  C" ?9 [0 v$ ?4 I
    // Then we create a schedule that executes the
; O8 s$ P/ c7 b- d- G    // modelActions. modelActions is an ActionGroup, by itself it
. k6 F" m+ M3 T4 d+ y9 B    // has no notion of time. In order to have it executed in
* G9 ?4 `: W4 Y% V' ]- ~3 @    // time, we create a Schedule that says to use the
7 W. R5 i: G* [- E( j9 I0 }+ H* n9 C/ Y    // modelActions ActionGroup at particular times.  This
  Q" d' K1 v8 Y5 d    // schedule has a repeat interval of 1, it will loop every) I% r+ @- x8 F  @
    // time step.  The action is executed at time 0 relative to
" `8 d; P1 A7 P  \    // the beginning of the loop.4 ^/ E4 s' c* P% v' W% p
5 ]1 j0 A) M2 J9 f6 T3 s
    // This is a simple schedule, with only one action that is2 h3 w0 d" a; T+ U- m
    // just repeated every time. See jmousetrap for more, r1 c5 a9 F) D
    // complicated schedules.2 y- l! N) E& q& c
  . I) `* d2 m# n) A# N
    modelSchedule = new ScheduleImpl (getZone (), 1);# {: I0 }* `% |
    modelSchedule.at$createAction (0, modelActions);
7 f( C4 |  N, w        
8 I$ ?8 Z9 S: w4 p% y: G+ X    return this;
' m, [, z. C' ?6 E: N  }
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