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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:3 I' n- _0 J7 D* Q# s6 r- |

' t) ~& i) _# t; B1 z public Object buildActions () {
3 F; P) e2 S8 f3 f/ e" O& v; `    super.buildActions();" o6 F, {2 ~: @# l, S
   
7 Z* ^% v9 M* i3 S    // Create the list of simulation actions. We put these in5 E3 ~" I2 M3 b+ `# T( V4 Q0 t
    // an action group, because we want these actions to be* g& T+ x+ d3 e. g" w+ o
    // executed in a specific order, but these steps should/ y# J2 h, B; @5 D
    // take no (simulated) time. The M(foo) means "The message
% C) q4 `( }, @8 o    // called <foo>". You can send a message To a particular
- ~3 u/ b7 M, b' r5 Q7 j    // object, or ForEach object in a collection.
  h3 s& r! f  r4 `        8 A( h4 ]* Z. g: z! ?
    // Note we update the heatspace in two phases: first run* }& ?! @' O: d, M% M+ m; J
    // diffusion, then run "updateWorld" to actually enact the$ O; `; D1 p3 z# G7 y
    // changes the heatbugs have made. The ordering here is
; i2 [! i# G' E3 L: [- R& _    // significant!
9 X; u: j& O) R3 i8 w; b1 R        ! ^) Z5 w8 ^4 U# k
    // Note also, that with the additional% L5 Q" ^+ W* \, k
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
( d/ _( D- D0 T4 f' J% U0 V    // randomize the order in which the bugs actually run
& L* D/ a; g! h4 h    // their step rule.  This has the effect of removing any
2 }: y8 o5 L; l6 Y' O- m! U    // systematic bias in the iteration throught the heatbug
, a7 N: Z1 k9 h# A    // list from timestep to timestep: G4 {9 v1 E2 S1 B7 f
        
' o8 c' I( S$ b; Q    // By default, all `createActionForEach' modelActions have# ?* K" m- T$ e9 w8 Z* t/ ~
    // a default order of `Sequential', which means that the6 c1 e) m9 M; a, y3 Q
    // order of iteration through the `heatbugList' will be
: Z% K8 F# L& t0 v5 ]    // identical (assuming the list order is not changed
8 f2 p: c: K5 }6 V    // indirectly by some other process).
( F5 v1 s. c* K8 f0 }5 P& I4 Z+ q   
  ^: ^4 D* d  @5 C" U% q    modelActions = new ActionGroupImpl (getZone ());6 B  x6 L; B& _; Q1 T
) z/ I6 D: ~) j# o# M- R" c: b
    try {0 B' \8 O1 o3 R" G+ g, e/ B
      modelActions.createActionTo$message; b3 L) D; f/ Y. `8 }' O
        (heat, new Selector (heat.getClass (), "stepRule", false));) b' f/ k* u" d0 ~
    } catch (Exception e) {
( q: L" S) Q# U2 I6 D      System.err.println ("Exception stepRule: " + e.getMessage ());. ?) v" N) ?# F+ A: `2 n
    }. s" M: `; I  r& I8 ?
6 w2 \' ~/ @# n; h5 H
    try {
4 X: d& n) [- b# J' C      Heatbug proto = (Heatbug) heatbugList.get (0);% L% c( h( H& }# S5 h' \3 p3 H
      Selector sel =
- L/ b5 [/ I! N. N        new Selector (proto.getClass (), "heatbugStep", false);
. m5 c# h  U; [" j      actionForEach =
/ b" c$ K# E- ^& F  C, e& I1 U        modelActions.createFActionForEachHomogeneous$call: a  o* }9 \& `6 y$ B
        (heatbugList,8 t! m2 x$ H7 w* V  r7 t% U
         new FCallImpl (this, proto, sel,; a& Z; f% K; ^; \$ t9 K1 O3 x
                        new FArgumentsImpl (this, sel)));
! B& r1 O2 e6 T5 Q( G* \    } catch (Exception e) {
9 j5 b8 a/ c+ R* Q( j/ T9 {" z0 `: p      e.printStackTrace (System.err);) P, B. n( V& D& d: I
    }% x0 o+ t% p  h2 q
   
4 ~1 W5 X, c. {5 `, J    syncUpdateOrder ();! `& C: p- N3 V* ^8 F& `4 L9 p

: R+ w" }3 z) U" N5 B5 H    try {
" Y9 `  U9 j; h  w      modelActions.createActionTo$message ; r* Y5 Y' i, M3 a7 E0 g
        (heat, new Selector (heat.getClass (), "updateLattice", false));; o5 b8 ~* ^; M
    } catch (Exception e) {; W$ o$ t  J7 X( c: a( b
      System.err.println("Exception updateLattice: " + e.getMessage ());) G4 i6 Y( @; a' C. r+ _) u* s8 t& r
    }
# E, a: e; Q  n# |* {        
/ L, p9 y3 z9 E! q) `3 u    // Then we create a schedule that executes the, N2 L- c3 s/ b7 ]+ w7 w
    // modelActions. modelActions is an ActionGroup, by itself it
! L- n. P* ^' {+ {# y3 I0 |    // has no notion of time. In order to have it executed in! {% y7 g0 b: k9 p* Y
    // time, we create a Schedule that says to use the
' j3 X6 O# K) r" \3 A! [, ?    // modelActions ActionGroup at particular times.  This0 h6 w* E9 d) R+ l/ C  b2 J/ k# i
    // schedule has a repeat interval of 1, it will loop every7 V7 U- v; D9 e
    // time step.  The action is executed at time 0 relative to
- ~) h. z5 O# }( @" T" ]+ y    // the beginning of the loop.
4 a( u; ?0 x! E! A6 V! L  |9 `8 y. c5 Q- O
    // This is a simple schedule, with only one action that is% E- y; u; k) t5 o+ j1 {9 e( l
    // just repeated every time. See jmousetrap for more
  w7 ?" ?' j# w/ p) y    // complicated schedules.1 u) v( F+ ]5 f& R5 K! t% S
  ) E; b% W& w+ K7 ]9 k
    modelSchedule = new ScheduleImpl (getZone (), 1);+ [9 `4 y' I7 J/ d! J1 @
    modelSchedule.at$createAction (0, modelActions);" i4 Z! [  k7 t' s
        
6 y  J( A+ C# W% m. W+ R    return this;$ r: j6 H  ^# H4 C9 A) c1 g
  }
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