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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 }& f# h* K! T! ~/ z
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public Object buildActions () {3 O0 }8 |( D3 d1 m. s* L9 G
    super.buildActions();1 u7 ^. i  O9 S! X
   
) @, P& R4 o6 {' j  o8 P    // Create the list of simulation actions. We put these in$ n0 k7 E6 m# f  ^$ s6 h
    // an action group, because we want these actions to be
, `7 O" D& M' c3 _! v    // executed in a specific order, but these steps should
* ]) K& @3 d" b% S! R: z4 R. u    // take no (simulated) time. The M(foo) means "The message1 e$ ^! g8 J  R/ f2 D
    // called <foo>". You can send a message To a particular- n* s' `' M$ }7 y
    // object, or ForEach object in a collection.
5 E9 Z& r* ~- D4 b9 a          u3 [- B' L% B" Z) q# e% Y: I2 J/ \
    // Note we update the heatspace in two phases: first run* m3 k2 q8 D, [/ }. i5 l) R
    // diffusion, then run "updateWorld" to actually enact the
! r- i! b- g% J* h5 ^5 E1 ~  Z    // changes the heatbugs have made. The ordering here is- q0 G" }5 s$ A' R+ \) H+ H
    // significant!1 O6 i  S6 r- H- U# F# b6 Z
        ' F; B  x4 e4 y, A& B
    // Note also, that with the additional& r' J5 g: P( V( r
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
- f' p! U2 ]" H8 M+ `/ p# t4 v    // randomize the order in which the bugs actually run
9 Q7 t6 ]2 |% x! N    // their step rule.  This has the effect of removing any7 x6 w2 v0 t" O, v
    // systematic bias in the iteration throught the heatbug
+ j3 M  g3 Z: `; D    // list from timestep to timestep% Q* g6 M& o& v- g0 ]! Y
        7 G* ~! h0 d9 _  r) ]
    // By default, all `createActionForEach' modelActions have, y' U6 d8 Q( }
    // a default order of `Sequential', which means that the
, ^9 V; ]: m2 e* K    // order of iteration through the `heatbugList' will be: i, l2 q/ d/ d* N; F% j
    // identical (assuming the list order is not changed2 n4 C# B- T$ l" y
    // indirectly by some other process).
1 z5 a" o" K/ {4 j2 i: u! r4 R' @    2 F( p# h9 J; ^  D. N
    modelActions = new ActionGroupImpl (getZone ());  P5 T& l6 y) U# S8 v
( a# O" V& n+ [" S) I' ~
    try {% P5 j* L' Y4 ^4 Y" |
      modelActions.createActionTo$message1 Q9 c8 W+ E, e: C5 P% \8 z' n
        (heat, new Selector (heat.getClass (), "stepRule", false));
% N8 T6 C& ~2 z/ _* n4 ]1 a    } catch (Exception e) {
5 F& k  r# z$ @" q9 W4 Y      System.err.println ("Exception stepRule: " + e.getMessage ());
$ ~, D% D! D2 p- V0 O4 }1 c    }9 B+ x: z+ S# S7 i

2 g0 \' ^2 ~4 U  Q+ v/ g* a4 y    try {$ J3 v, Q& _0 b6 w; d
      Heatbug proto = (Heatbug) heatbugList.get (0);! _) j9 W; c9 k/ I5 G
      Selector sel =
+ z- _+ Z3 B7 x% S3 G9 h        new Selector (proto.getClass (), "heatbugStep", false);
+ e  W8 i0 S5 [      actionForEach =/ w: f2 m- M6 u9 d
        modelActions.createFActionForEachHomogeneous$call  x# {+ o# b2 Q0 T# r
        (heatbugList,
; O8 K8 ]; ~+ q4 P' n         new FCallImpl (this, proto, sel," X6 a& f6 |  _- [: A. t
                        new FArgumentsImpl (this, sel)));
% g: `4 h" w  }: G. K    } catch (Exception e) {
2 ]1 Z1 h" s. ^! `5 u! b      e.printStackTrace (System.err);0 X( t8 l: j2 P% D0 C7 o  u% U
    }$ U4 s6 f7 M, {+ Z
   
$ v; p% r- |3 y  }, E  F    syncUpdateOrder ();
9 K& p& ^2 c7 I7 l& J5 w& i4 }: S/ j
    try {
  L! n7 c% v3 b. @; \" ^      modelActions.createActionTo$message + k! i; ^5 }% I' z1 @/ k: m
        (heat, new Selector (heat.getClass (), "updateLattice", false));- R, n- e6 a9 e3 W0 ~
    } catch (Exception e) {
7 ?8 h/ R1 P8 M      System.err.println("Exception updateLattice: " + e.getMessage ());
) R" i5 A! B+ M  C  q5 e* Y8 m    }  |( t; I4 U! k1 b* r5 c
        " U' ~. T$ D8 Q8 p
    // Then we create a schedule that executes the
3 h1 b# s/ _6 p+ C- E$ W1 x    // modelActions. modelActions is an ActionGroup, by itself it8 A: R0 `* R# A+ M; D9 h
    // has no notion of time. In order to have it executed in
/ }0 N. {" N2 @' f5 v, W7 B1 L    // time, we create a Schedule that says to use the3 F% T# [8 n$ J' d  X) f
    // modelActions ActionGroup at particular times.  This
5 u: C! u* l- |7 b$ ?) E% e    // schedule has a repeat interval of 1, it will loop every  S. W$ C' [( N" B: F% G$ j/ t
    // time step.  The action is executed at time 0 relative to1 L: e$ @5 a6 m0 G/ [" g  i- n
    // the beginning of the loop.
4 O& r' D8 u: G8 M! M/ A2 M- u* e4 |9 ^. M
    // This is a simple schedule, with only one action that is6 i4 A5 B* U( i- U! ]8 k9 m
    // just repeated every time. See jmousetrap for more0 C% [! L- }" F2 n  v
    // complicated schedules.
. ?; L0 x) S7 A  
" L) z) S& i  b0 K- A7 V- e0 W& Z    modelSchedule = new ScheduleImpl (getZone (), 1);; J) B/ `, _1 r- e
    modelSchedule.at$createAction (0, modelActions);  l# n  a! C3 B
        
, U- h0 l+ U3 H0 @    return this;" p1 B% A2 f! X) P& x; E3 M
  }
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