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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:
! H% y6 y3 q7 N' z- S, M1 n7 j! P, C, o, @
public Object buildActions () {
1 R$ v! p1 {' n& t5 N: D    super.buildActions();7 e' Q7 y9 Y( U  {) X1 m
   
1 V) M% O+ P& U* }4 |! }    // Create the list of simulation actions. We put these in$ g8 i) `# `) J+ \, z, q, i2 ^
    // an action group, because we want these actions to be% X( f9 X: Q; x$ h  y- B
    // executed in a specific order, but these steps should
, y$ v, u# j& B1 L+ o    // take no (simulated) time. The M(foo) means "The message
8 ]4 R! H# f8 `  @6 ]+ W/ C& H    // called <foo>". You can send a message To a particular4 O/ R# y# Z( ~$ ]9 h) }7 T
    // object, or ForEach object in a collection.% ?' {! {  W2 G# Z- E" x1 \
        2 l0 x! G% M7 {
    // Note we update the heatspace in two phases: first run, s) @5 t! `; G. y
    // diffusion, then run "updateWorld" to actually enact the8 {8 @' d4 x1 ]; @
    // changes the heatbugs have made. The ordering here is' L, t1 m7 K6 r+ r8 T8 C
    // significant!) [( O7 t& _. D' C- p9 c
        # G: o1 y; [5 j, M, @5 M
    // Note also, that with the additional
  D5 W) ]7 H; Q2 e    // `randomizeHeatbugUpdateOrder' Boolean flag we can
  h  ]' u* n( o" Q. Z6 }5 \( s2 c. \$ e    // randomize the order in which the bugs actually run2 h* u  q. M6 L2 S
    // their step rule.  This has the effect of removing any
; k7 N4 u' Q; F  H( E& O    // systematic bias in the iteration throught the heatbug
# w) t: C& Z1 y8 c/ Z    // list from timestep to timestep
; O. [0 f8 A) \0 m; ?. s        ; }. Z: A, I; i+ Q+ F6 d, |
    // By default, all `createActionForEach' modelActions have1 F7 n, S  ^! O  t5 {  W2 d9 r
    // a default order of `Sequential', which means that the2 N5 J/ Q6 t3 v0 [# S6 H9 x( F
    // order of iteration through the `heatbugList' will be
1 n) l' Q. h  Y$ @% p    // identical (assuming the list order is not changed. k' b' {3 E* i
    // indirectly by some other process).0 k) v2 b0 E! h; y  Z
    $ B& u) O0 J* Y% S' c+ ]
    modelActions = new ActionGroupImpl (getZone ());3 _9 n' b9 f8 m5 g6 w! P

7 p( Y  V; _, n- W3 C    try {# M" {0 p" v0 \% J2 B6 M# F. C
      modelActions.createActionTo$message
+ I/ G7 n: Z& Y$ {8 u1 A8 G  Z        (heat, new Selector (heat.getClass (), "stepRule", false));
, R7 s( w2 N  e    } catch (Exception e) {0 P7 r% a  H7 L- ?. \
      System.err.println ("Exception stepRule: " + e.getMessage ());' n7 Z8 W# r0 I/ O
    }
  E. U8 o  ^0 N6 `4 B/ ~
4 J) R; L7 u9 A+ N, w    try {8 |/ o8 |; @& s4 y, n9 D
      Heatbug proto = (Heatbug) heatbugList.get (0);
% L$ d+ o$ S! _; u; s      Selector sel =
: l2 d8 D& V; {$ e. H# B& t        new Selector (proto.getClass (), "heatbugStep", false);
1 H9 t+ {9 r' l; Z$ U( t/ a      actionForEach =
+ r; @+ `# m7 s: G& T5 X6 P0 i        modelActions.createFActionForEachHomogeneous$call8 Z0 a4 ^5 Z& I2 d9 i' l& ?( C
        (heatbugList,$ x5 q3 J) |4 @. [" s3 B
         new FCallImpl (this, proto, sel,+ s8 g" n" k8 T8 j
                        new FArgumentsImpl (this, sel)));! f8 y" p% R9 h5 {' A8 S9 \1 a
    } catch (Exception e) {
+ o! o5 @( \& w9 \7 X2 F$ |      e.printStackTrace (System.err);8 i$ W5 O6 m/ Y. y9 n9 Z- c4 g8 U
    }# \7 X4 C% ?' F
    , {/ \% I/ V. I8 S; Q! s
    syncUpdateOrder ();6 {" b$ J0 t. X1 P& k; S6 V4 ^/ [
! {2 m# j8 y5 i& T: M0 m- @" R
    try {
) d7 V1 |% h4 B      modelActions.createActionTo$message % d' l; [9 a# w( c! u4 V; }$ B2 ~' u
        (heat, new Selector (heat.getClass (), "updateLattice", false));4 G# z3 |. l5 j( c3 ]6 Z% B
    } catch (Exception e) {
" P: ?3 E. |# x: ?% O      System.err.println("Exception updateLattice: " + e.getMessage ());% r+ L( U% H% y/ o' b
    }6 A0 _# @* A  x+ v- C% I  ]
        
8 J# s8 F" R1 z- m/ y+ X    // Then we create a schedule that executes the, E/ K  S0 l* {
    // modelActions. modelActions is an ActionGroup, by itself it5 M- m3 P4 y. w+ ^% S3 e
    // has no notion of time. In order to have it executed in
" W  t- n0 H0 K1 `3 q    // time, we create a Schedule that says to use the6 y6 F' r+ Z) `, ]6 \8 P5 S6 m
    // modelActions ActionGroup at particular times.  This+ Z( C( {4 Q* M  B! O* C
    // schedule has a repeat interval of 1, it will loop every2 e% n- v' b& I; I4 n: k. a# ]
    // time step.  The action is executed at time 0 relative to
' k' `- P7 x7 W) C2 r8 e5 I* m# L    // the beginning of the loop.2 D5 k* ?: M# X

7 j% t$ M/ i! v* W8 K    // This is a simple schedule, with only one action that is
! p2 ~% A6 m7 {5 P3 e" ?! T- z    // just repeated every time. See jmousetrap for more
5 _& w0 X2 o) C) Y    // complicated schedules.6 e! U( K2 }" ^0 h9 u- ]+ ~
  2 i6 N7 P8 H, D/ K
    modelSchedule = new ScheduleImpl (getZone (), 1);
  U+ G* T' b' A  }; N2 y    modelSchedule.at$createAction (0, modelActions);
8 {& f7 E/ C4 O/ ~4 Y4 S        
, R8 t! L8 `. W6 n    return this;
6 D( z7 [' c/ o/ T3 G+ T9 c  }
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