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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:/ ~2 J9 p* c1 M1 z' O
" x. Y' u& `' O/ F( d0 G3 B
public Object buildActions () {' D" Q" y3 p0 b
    super.buildActions();
7 J# U  N6 Z' {    8 s8 O5 }# m1 s# h# k
    // Create the list of simulation actions. We put these in
( I$ a* B* ?* c) P    // an action group, because we want these actions to be3 y, F% D: _% V" v, B5 n7 c* ^
    // executed in a specific order, but these steps should
: m' I; r3 V  R1 q& n    // take no (simulated) time. The M(foo) means "The message6 Q3 M* u& _  p7 s4 C/ Y+ @
    // called <foo>". You can send a message To a particular, R- d, n1 L( s$ c2 ]; h% I
    // object, or ForEach object in a collection.* _2 c/ F3 W3 J# ?3 G
        
' h  z" L' u& T+ M    // Note we update the heatspace in two phases: first run
3 F1 [1 I. O/ ^    // diffusion, then run "updateWorld" to actually enact the( K6 u7 {+ e: F: Q& u8 L
    // changes the heatbugs have made. The ordering here is, Q3 V1 ]9 _  h, i
    // significant!7 |: x) B. U% ^
        
) S* Q2 J0 X4 ]- J$ S    // Note also, that with the additional9 x6 C4 n) C2 W% z
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
: Y+ K0 T. p* X2 x* b7 l    // randomize the order in which the bugs actually run! R2 H. q# ?$ D1 j% d
    // their step rule.  This has the effect of removing any) n& ^& n4 m2 _! ]0 l3 a8 z
    // systematic bias in the iteration throught the heatbug
, Y( h& e0 `8 l5 l- {7 A# Y8 `    // list from timestep to timestep, B/ z6 p' S* A. Y8 z# v  W
        
$ E6 I8 L4 ?) R    // By default, all `createActionForEach' modelActions have
' Y6 K6 o2 n, w$ m4 W, l' B: Q9 F1 s, Z; k    // a default order of `Sequential', which means that the* _# [0 ~0 @7 Y" J* M8 e
    // order of iteration through the `heatbugList' will be9 U. C% C( Z5 M, S
    // identical (assuming the list order is not changed3 r; R5 q: N! B8 \  ?
    // indirectly by some other process)." C( I5 _( {: U- B) d
    8 `' q5 p/ m: j( ^5 h& J
    modelActions = new ActionGroupImpl (getZone ());+ n' _/ @! }2 c$ w4 [

, A* _; ?2 q! v9 J8 |    try {
; n! F9 o3 I& a1 H  I9 [" w      modelActions.createActionTo$message# u6 Z2 w. `) ?  V0 n, U) m' k
        (heat, new Selector (heat.getClass (), "stepRule", false));( {+ S/ K/ p8 S' `6 E
    } catch (Exception e) {
, y- p- p9 O' V) \      System.err.println ("Exception stepRule: " + e.getMessage ());0 P" ]9 T2 e2 J: \4 W3 v
    }8 D) ~# r+ f" G; n; \4 y; b7 ^2 H

! G% D) C) w; R7 A6 @. E    try {
6 i( M# f/ ?& x+ F2 C      Heatbug proto = (Heatbug) heatbugList.get (0);
8 Y! ?5 R% B  i- d# g      Selector sel = - K, I# ~7 H  L4 g
        new Selector (proto.getClass (), "heatbugStep", false);0 c% a: C) z- o' K  p: K, X
      actionForEach =
5 W* o; o" G* M/ z% l: W        modelActions.createFActionForEachHomogeneous$call
2 r) M4 A: \( ^" `: K        (heatbugList,
1 G4 C5 V5 H% f         new FCallImpl (this, proto, sel,
6 H4 Z) ^$ L' M2 s/ H                        new FArgumentsImpl (this, sel)));/ c0 x( Z/ _, K" b# f" K, p5 I
    } catch (Exception e) {
+ j5 |9 \& k9 R6 r      e.printStackTrace (System.err);: c" q& O/ |$ I
    }! n/ Z0 Y( H( a+ K; S  A' P$ `- i
    1 p% W. V0 u/ b) O
    syncUpdateOrder ();2 q; h/ q5 z  o, a. s5 i" e

+ H" o5 q, I5 a8 e* A3 o$ M    try {0 h, z9 Y& R" ]/ d( A
      modelActions.createActionTo$message 1 c% X/ c' R0 O6 |
        (heat, new Selector (heat.getClass (), "updateLattice", false));  A0 c) Q6 t. G- Q5 T* M
    } catch (Exception e) {
' X  @" b3 C- A' ^8 e      System.err.println("Exception updateLattice: " + e.getMessage ());
& m- u3 ~0 k. r5 F    }. X# M. ?  y& x% R2 z' K
        
! O! G: R& u( e2 p    // Then we create a schedule that executes the$ k% o+ D0 x( q- L! D$ p5 j
    // modelActions. modelActions is an ActionGroup, by itself it; m6 I, Q# ?# h& a
    // has no notion of time. In order to have it executed in- Q( v) v6 h) B
    // time, we create a Schedule that says to use the- Z) Y; N6 a7 e
    // modelActions ActionGroup at particular times.  This
% N/ `/ [! N5 A' B    // schedule has a repeat interval of 1, it will loop every
1 g/ R1 G9 y. A, J9 l1 T0 s* M    // time step.  The action is executed at time 0 relative to6 g. j( g( k' S, a! I3 ]$ a% n
    // the beginning of the loop.2 k# u$ I9 C5 k1 b9 @" K( n

4 N  t. K! k: V( |% e) v    // This is a simple schedule, with only one action that is
# U  B# O9 Z5 C, h    // just repeated every time. See jmousetrap for more8 \5 u9 Z& Z6 M2 n
    // complicated schedules.
/ Y( V9 O! N; p' U- ]  `( \8 @% E  , J  R) R  Z* e/ j
    modelSchedule = new ScheduleImpl (getZone (), 1);) `, ~: J. j( L1 b6 h; H
    modelSchedule.at$createAction (0, modelActions);- E7 Y" ?! z7 c/ I
        
) R7 ^& J: ]. J; ?    return this;' d4 A# E# ~0 \: U/ s
  }
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