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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 o  c4 x; j" N0 Z$ u
2 o# W2 z/ C4 a2 ]2 h) L! q$ e- O1 u public Object buildActions () {
( v, R; K! ~5 d& t: ]    super.buildActions();  J; |! t: T0 @+ f0 N
    ! H. b$ _* s+ U' y0 A0 d
    // Create the list of simulation actions. We put these in
1 k+ ]+ W- T6 L+ x9 T+ Y    // an action group, because we want these actions to be
" ~, L) m9 p- W. H& K    // executed in a specific order, but these steps should8 y! B. ?6 G$ T8 \$ \# H
    // take no (simulated) time. The M(foo) means "The message, E+ u! z0 g9 c8 Q$ z& {) T
    // called <foo>". You can send a message To a particular
" Q: I1 b7 a! z    // object, or ForEach object in a collection.& K4 c" G3 T3 ^) [
        
) X+ @8 c1 n  ]; i    // Note we update the heatspace in two phases: first run  q4 _, m! v6 m3 ]( `
    // diffusion, then run "updateWorld" to actually enact the
) Z, u+ u7 F& \0 d  ~    // changes the heatbugs have made. The ordering here is8 U  j. S6 U' D: @
    // significant!1 _- |3 Y0 l- ]% }! k2 d9 y8 _
          z" `! v: F( ?$ C8 a
    // Note also, that with the additional2 ]8 b* |& ^7 a. H+ G# a
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
' L! y2 W0 ^: |    // randomize the order in which the bugs actually run/ h* a4 ]5 y7 }  Q  x
    // their step rule.  This has the effect of removing any
1 ~0 M8 z9 m/ E7 H3 Y    // systematic bias in the iteration throught the heatbug
8 w1 K2 \) a! z& W    // list from timestep to timestep3 i! R) Q+ }! Z
        
3 ]& s1 A, z' r4 V% r    // By default, all `createActionForEach' modelActions have5 l" f% x$ o. B1 I; X
    // a default order of `Sequential', which means that the+ P: }9 z$ o) f5 J! f) e, J7 P
    // order of iteration through the `heatbugList' will be
6 Y* d+ l7 l. q, J; c: j9 n+ f+ q    // identical (assuming the list order is not changed+ ]8 |* _/ i% J% I: L
    // indirectly by some other process).% g2 i$ V1 D5 O7 r# f; ~$ L* @
   
7 o8 e& X* _4 v0 g    modelActions = new ActionGroupImpl (getZone ());
( j  [+ [5 I  V3 R
  Y2 X% B* W* q5 P) P    try {1 X! n! e  @9 ^# X; B2 s
      modelActions.createActionTo$message( A" e) w, S# X7 l* |. S
        (heat, new Selector (heat.getClass (), "stepRule", false));1 k& M5 ~* ?( S+ T$ \
    } catch (Exception e) {
: C- ^& _$ d. M( P) o$ u      System.err.println ("Exception stepRule: " + e.getMessage ());3 Z, ^+ C% ^. U$ Y( N' `" X. r2 U
    }2 X( K  |5 p! D* s

! f- r: n. B8 q1 t- m# _( F+ i7 W    try {
8 }& T3 b+ v: e( u/ q1 M2 f7 E      Heatbug proto = (Heatbug) heatbugList.get (0);4 o1 l- C$ I; M4 M9 q& `, s
      Selector sel = 3 Q* ]5 q; H8 }! h
        new Selector (proto.getClass (), "heatbugStep", false);# o' T! |! L0 h( y
      actionForEach =
6 F! H4 i+ d% }/ N        modelActions.createFActionForEachHomogeneous$call
" j7 K4 h" l# [* @        (heatbugList,9 g& u5 G& K. ^0 E5 l9 M
         new FCallImpl (this, proto, sel,# K* ]* @' J7 O$ U: p
                        new FArgumentsImpl (this, sel)));
7 @) h( Y0 ~* n9 v6 [    } catch (Exception e) {: k" b( |5 B9 Z# O6 |
      e.printStackTrace (System.err);7 W; X  S1 q8 ~, f: i
    }
6 q, o7 t4 i9 y4 h" u& y5 ?- L   
; w* m3 f& p' o3 A    syncUpdateOrder ();
2 }/ H; ~$ w$ b  K! g& a7 J0 K: u+ H. V3 \9 A( z: W3 A
    try {
) e  `& E) X- d! t' J# l      modelActions.createActionTo$message & r( Z: g4 O8 I! _" I- j+ ]
        (heat, new Selector (heat.getClass (), "updateLattice", false));
- T) x( y# z* _& c7 A    } catch (Exception e) {7 {( q# p; J! p: A' W* w; a
      System.err.println("Exception updateLattice: " + e.getMessage ());- e2 {# U8 _/ I8 |& `
    }- ~1 A  ?+ ^' s! V$ u$ T
        
  O& a0 ]& l3 {' z5 V    // Then we create a schedule that executes the
* X( Q% b+ s7 }/ z8 Y1 s) }8 g, {    // modelActions. modelActions is an ActionGroup, by itself it, b: G- p8 a7 v1 ?
    // has no notion of time. In order to have it executed in
) n' Z: l. H, I$ I& O* E2 n    // time, we create a Schedule that says to use the6 I. q; E- z( ~, j, S, B2 [9 d
    // modelActions ActionGroup at particular times.  This- }0 V* C4 {6 y% S
    // schedule has a repeat interval of 1, it will loop every, `# e/ [* l! b# c5 V
    // time step.  The action is executed at time 0 relative to, h% n' m+ b( U  f8 u
    // the beginning of the loop.2 T' P  N& |/ H% S) p" R+ Y
" @8 Q' g, J; |9 W9 T
    // This is a simple schedule, with only one action that is! C, N+ n: f! p) d- A7 a! L
    // just repeated every time. See jmousetrap for more
, F  [; P# ?" D) \8 Y    // complicated schedules.
0 U- |2 P3 \4 q+ }3 w/ B$ d3 }  k  . z# a& q. c4 x9 V* d+ Y
    modelSchedule = new ScheduleImpl (getZone (), 1);
6 \9 s9 X% b2 g# Y2 a% S    modelSchedule.at$createAction (0, modelActions);# Y% i: B* e- c; n+ `
        
4 _2 b/ y8 Z4 d( }$ Z    return this;& a7 l0 d* s: j5 ]5 n( V
  }
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