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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:
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public Object buildActions () {& Y( z( I1 Q7 z4 W. k
    super.buildActions();' k# k. B* s+ O5 C
   
% {# ~( F; U+ N" a: c, r    // Create the list of simulation actions. We put these in
% @, O5 x) M8 M, ~2 ?$ K- h6 ~    // an action group, because we want these actions to be
' d% }9 B! w1 j9 v+ t) |    // executed in a specific order, but these steps should7 H# ~5 I/ g8 x; g& V9 V
    // take no (simulated) time. The M(foo) means "The message, I: x# S5 y4 d! @) @4 }  z; a
    // called <foo>". You can send a message To a particular, A# a; g6 P' V& K5 U9 T# Q
    // object, or ForEach object in a collection.3 T1 `9 ]' `$ X& |
        0 l- d6 F+ I7 O
    // Note we update the heatspace in two phases: first run9 @8 g# l1 @5 B0 l4 E9 w
    // diffusion, then run "updateWorld" to actually enact the4 ~2 \$ K% i6 Q
    // changes the heatbugs have made. The ordering here is. M+ E6 e$ P0 Z8 z( D0 H, E
    // significant!
. S- o' M2 {$ O; P1 o; b        & r4 @/ p& `4 D; K  T! S. \- W( t
    // Note also, that with the additional3 C# ]9 ]6 p2 [/ |$ S% m
    // `randomizeHeatbugUpdateOrder' Boolean flag we can. q) w: K/ G1 U1 L
    // randomize the order in which the bugs actually run  U, T; e+ M2 s, p" U0 O0 T
    // their step rule.  This has the effect of removing any
2 d1 i/ Y1 t; p: ]/ L& X  H1 T1 v+ |    // systematic bias in the iteration throught the heatbug
! p4 A- P: k5 ~2 C8 ?    // list from timestep to timestep
: h6 h& o2 a! ]9 {        
5 B2 r/ R, N; r% q    // By default, all `createActionForEach' modelActions have; K) Z# k  a( x+ {+ u! w
    // a default order of `Sequential', which means that the
2 U6 Y, e+ H/ I9 }    // order of iteration through the `heatbugList' will be
( }6 e$ P: `- z5 o9 |    // identical (assuming the list order is not changed
+ ]+ m1 |* O0 k4 h4 K& H6 g4 P3 k4 g    // indirectly by some other process).$ k. s7 c1 t9 q3 F3 Q* Z4 o) Z
    5 ^0 n3 h: L$ E. C! o
    modelActions = new ActionGroupImpl (getZone ());/ X0 U' C+ i( ~$ z+ C  V
! J& T' y! b" U$ `/ O* L0 A4 K
    try {
+ [6 f8 S+ p0 F      modelActions.createActionTo$message
( x1 P9 Q' b- R9 `: M) U" M        (heat, new Selector (heat.getClass (), "stepRule", false));. q3 r: o. y0 ?3 I" u  {4 N
    } catch (Exception e) {
. J3 S6 Y; u  _6 H& I& I. Y' G      System.err.println ("Exception stepRule: " + e.getMessage ());% L$ d5 G/ j4 q  e: o( N
    }
- w7 f& F5 m  }: K& K# X$ ~- t: @9 s9 q
    try {
3 }5 [2 V8 Q. @% B      Heatbug proto = (Heatbug) heatbugList.get (0);4 Y& q0 k: I- o+ @; t" x
      Selector sel = $ }5 P. B; p4 r* }! @% d, z
        new Selector (proto.getClass (), "heatbugStep", false);
2 ?& g% G3 t! O) f! |      actionForEach =
% Y' k$ J" D- T2 e& S% ^  }& w2 q6 O        modelActions.createFActionForEachHomogeneous$call
3 p! G# a* A% o; U3 c        (heatbugList,
! P" R2 n" f6 O9 q( e         new FCallImpl (this, proto, sel,
( `+ b2 D  c. M/ d                        new FArgumentsImpl (this, sel)));* d/ [% g: m% |" c/ r9 u
    } catch (Exception e) {
  l6 |4 U) p3 L3 ?8 ]+ O      e.printStackTrace (System.err);: V8 ^& d2 o0 e9 [8 ~# p
    }7 {# ~( {+ R* @# @" T6 M
   
; q. X: L, r% X% ]$ Q    syncUpdateOrder ();
# W* l+ [2 e; D& g3 u5 ~" S' @6 @; F1 f# F! w! p& d
    try {7 O, K% M' r7 T/ a& a
      modelActions.createActionTo$message # W: ~6 V8 Y0 a" d5 ~6 v. N" M
        (heat, new Selector (heat.getClass (), "updateLattice", false));5 D' S/ L7 i: Z* O+ _
    } catch (Exception e) {( n  j5 [- h8 v+ d
      System.err.println("Exception updateLattice: " + e.getMessage ());& ^  w1 M5 Q* ?0 w6 r2 p, ]
    }; g4 _* C7 l/ U
        . H" r: {2 Q6 A4 T  _. d
    // Then we create a schedule that executes the8 r0 ]* I! d" x3 o' l! K. _3 y+ _
    // modelActions. modelActions is an ActionGroup, by itself it
0 x1 D  }+ B! Z% P4 q: ?/ |% Q    // has no notion of time. In order to have it executed in7 V  c- F3 |% y+ [3 w# j2 W! o3 \
    // time, we create a Schedule that says to use the+ P4 X" o6 P" z" h8 j- q$ U
    // modelActions ActionGroup at particular times.  This; A/ s8 a* w+ X% B2 b- r4 D
    // schedule has a repeat interval of 1, it will loop every! e5 D" W" g1 W* B8 E! A2 X
    // time step.  The action is executed at time 0 relative to0 P2 n/ C. X/ R; {5 `
    // the beginning of the loop.
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& G2 f2 I) F* f7 |& {& B7 K    // This is a simple schedule, with only one action that is* U* H8 K: H! U# D2 q% A& I7 M
    // just repeated every time. See jmousetrap for more
& s: u, ^" N' T" @- ], M3 \    // complicated schedules.$ s& f, z) B5 S3 c& X, g
  ; {- M1 `  q2 j, G" Y  k1 T1 W
    modelSchedule = new ScheduleImpl (getZone (), 1);" L7 i7 S! D' G1 I$ ?
    modelSchedule.at$createAction (0, modelActions);
2 s" i9 d+ `# y5 n: T7 M        
; v: I& Y. o5 q; a; A5 E: S    return this;
& j8 g' M( ~! p9 M0 {+ D  }
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