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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:
% i- l$ V6 z0 b# g) M
, I5 F: a5 b/ D' E5 C6 o public Object buildActions () {$ x9 Q& ], X) e; v6 ]
    super.buildActions();7 I4 \6 n% I, E& M) h5 {0 s  B$ F
    ' I" F! l% `1 M7 L* L8 a" t
    // Create the list of simulation actions. We put these in
/ [9 k; u9 Z6 s    // an action group, because we want these actions to be
$ b! Q9 \1 p8 P    // executed in a specific order, but these steps should
* P, i' F% p7 J8 d2 C8 J    // take no (simulated) time. The M(foo) means "The message! c$ n/ O  D7 M& x8 G; l8 I2 R
    // called <foo>". You can send a message To a particular" b9 Q. F/ Q* p# q+ \9 w
    // object, or ForEach object in a collection.9 O9 ^9 d. t: ~+ j5 ]7 a
        
5 u; q: R! R) X) ~9 k( t    // Note we update the heatspace in two phases: first run# L1 q6 ?+ h  _9 }, `
    // diffusion, then run "updateWorld" to actually enact the
  z( r) i& `* A% T) `    // changes the heatbugs have made. The ordering here is
/ f* j% |( k' l/ K/ {3 `    // significant!* y) R* R' u8 X" x, U/ N
        
& g7 q0 u1 ]0 y- P5 B( `' \1 m    // Note also, that with the additional
% u& A  C, ^& C    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 W3 {: s; c, W, v' n+ J
    // randomize the order in which the bugs actually run
0 n0 L9 Q" Z% ]% A    // their step rule.  This has the effect of removing any
% E: ~# L* I; i8 ]4 ~9 r    // systematic bias in the iteration throught the heatbug$ e  j. N; O; [4 T
    // list from timestep to timestep2 h; {8 C) f* P
        
  l' s& b: [0 H  s9 U    // By default, all `createActionForEach' modelActions have
  j' z' W4 p6 i6 U& Z$ r2 c# p    // a default order of `Sequential', which means that the
0 Q2 [2 p0 b. ?& N2 `, `    // order of iteration through the `heatbugList' will be
- a) Q2 R/ R4 l  B% f$ T* }    // identical (assuming the list order is not changed, L8 Q2 J0 H. i/ Z
    // indirectly by some other process).2 `+ z7 q, @- y5 X+ s9 @( u2 k& y
    . ?9 I" `2 z) Y$ W& r1 D: y
    modelActions = new ActionGroupImpl (getZone ());; W' @8 p; K, h& A

( M; Z" P( Z7 O' x* m    try {
1 l2 N2 F* S. t- ?0 G9 w4 [3 e$ f! M' ^      modelActions.createActionTo$message. I; }' _; j4 z1 v; U1 r
        (heat, new Selector (heat.getClass (), "stepRule", false));+ B, u; z, L, B/ S0 C0 c4 s( e3 f5 W
    } catch (Exception e) {$ E. ?' u1 x# E
      System.err.println ("Exception stepRule: " + e.getMessage ());6 M# K, u, h4 s( B1 m
    }9 ^& I3 J0 H2 p' v+ ^4 T9 J- _
: F* V- P: ?$ o% \
    try {
. }3 o; T- X* n4 A      Heatbug proto = (Heatbug) heatbugList.get (0);0 x" X( j( g+ }$ ?& E
      Selector sel =
+ A. g- C, ]1 Q" J        new Selector (proto.getClass (), "heatbugStep", false);2 o$ F6 [0 i; g- c  l6 M, p# _
      actionForEach =
$ a: m6 m- t, Y' u/ m1 @        modelActions.createFActionForEachHomogeneous$call
6 X- S7 q& F  s! o        (heatbugList,
; w% |9 G5 o6 X( G         new FCallImpl (this, proto, sel,3 e- T  M7 x* k5 F3 B; s
                        new FArgumentsImpl (this, sel)));" U! X( o: Q0 x$ v& U/ z
    } catch (Exception e) {" w! Z. |6 c/ L8 O* I0 j
      e.printStackTrace (System.err);
) K: [# ]% w5 D) J- ^    }
5 l2 c/ u* i4 Y2 O; E    ' e2 L, G% z" a" o! F# G0 f2 I
    syncUpdateOrder ();
$ O! U3 N5 X: K' k- C3 p; F1 H* v# A. T; D& f; f
    try {
- [1 N- T) t1 M1 x# a- B      modelActions.createActionTo$message
$ l' z4 u! o& n3 ~  A% s0 d        (heat, new Selector (heat.getClass (), "updateLattice", false));. O! c* m# \8 d: b' p
    } catch (Exception e) {
) f9 k) W; @. x, I. @      System.err.println("Exception updateLattice: " + e.getMessage ());4 d5 I, F! U3 t
    }
1 L1 A9 d+ }; F- Y        
+ I: b0 l) C  V, g7 c3 I0 i- M    // Then we create a schedule that executes the- L& z( s3 e- J7 W
    // modelActions. modelActions is an ActionGroup, by itself it
/ U) t) }! j- \9 m8 {    // has no notion of time. In order to have it executed in
+ m9 A. r+ m* h: O7 o    // time, we create a Schedule that says to use the' [, h1 k! W2 N
    // modelActions ActionGroup at particular times.  This9 [! z  h! F, i8 p
    // schedule has a repeat interval of 1, it will loop every
, r9 }. u* ]- C+ a! ~' r, ^    // time step.  The action is executed at time 0 relative to
9 [7 Y' L: k! g/ e; Y! e    // the beginning of the loop.
: b3 F# h' N8 O! V9 U* I$ O6 V: A) Z+ _: h
    // This is a simple schedule, with only one action that is
6 O$ U6 r+ Z4 h! [    // just repeated every time. See jmousetrap for more% @" L4 j6 h2 W/ ^
    // complicated schedules.' b% \1 d' b: b
  # q7 u0 o* W& u/ o' B
    modelSchedule = new ScheduleImpl (getZone (), 1);
% K+ C% l2 ?1 n5 \7 f    modelSchedule.at$createAction (0, modelActions);
/ z' t- e" [. Z- F, ^; x  E3 t$ p        ! q# C2 x3 ]) p; c$ p
    return this;* T( e& _# m2 M$ a
  }
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