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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:+ t2 O6 z/ U0 l9 r4 A* w3 I0 j

$ {5 ?. I$ m' Z, s  `/ z public Object buildActions () {* H0 f2 c' S. d, l) ~0 w& Y+ `
    super.buildActions();& r* e& W- J9 \' ]% l
    8 H2 G, f6 C+ t3 G, F/ c5 s
    // Create the list of simulation actions. We put these in
( o9 y# u1 g5 f. \. ^: b% q    // an action group, because we want these actions to be
* [$ c5 f  s" J* L! h! y5 @- R: ~    // executed in a specific order, but these steps should9 ]9 J3 m0 i* r. b/ J+ Z2 K: o
    // take no (simulated) time. The M(foo) means "The message+ u* O" A6 ~4 J
    // called <foo>". You can send a message To a particular
) R8 B7 v4 k, b. ?5 l5 g    // object, or ForEach object in a collection.
# L2 i$ |# l# a4 ?9 L4 r1 q        ( V8 G# r4 k% H, C: Z2 o
    // Note we update the heatspace in two phases: first run: j# f: a; _8 @" z! l8 {
    // diffusion, then run "updateWorld" to actually enact the, G: G4 ~+ o7 y. u6 G
    // changes the heatbugs have made. The ordering here is1 w8 ~" C7 I! m( j
    // significant!) M, E% k9 C/ i8 K, E# e/ P
        ' g  |3 Q8 C* r5 g
    // Note also, that with the additional
& h5 w5 M9 Q# s! F    // `randomizeHeatbugUpdateOrder' Boolean flag we can+ T" P, r7 J/ T) ^
    // randomize the order in which the bugs actually run
. O: ^! l" m$ u5 J5 d( t! `    // their step rule.  This has the effect of removing any( `9 F& N0 }" U6 e
    // systematic bias in the iteration throught the heatbug  A2 `* U8 r& y
    // list from timestep to timestep% k' Z6 z# d( S$ Z
        $ m: d. l5 _* J% K! y0 N% x
    // By default, all `createActionForEach' modelActions have' M$ M5 ?& G* W
    // a default order of `Sequential', which means that the
( f$ I8 n" D8 Q+ b    // order of iteration through the `heatbugList' will be% d. r" T! C" v3 K$ X
    // identical (assuming the list order is not changed
' ]+ N& r+ d* e# p# k& W    // indirectly by some other process).
+ D4 l& l5 f* d# n) A: w" Q   
+ Y& P# {1 _: x    modelActions = new ActionGroupImpl (getZone ());: x8 e& g' \3 P* T( c; }- n

# U1 R3 _+ X2 y9 |; y    try {
* [' H2 `. C, P  s5 u: F0 R      modelActions.createActionTo$message6 l- U  v: m' n. p: _- f! k
        (heat, new Selector (heat.getClass (), "stepRule", false));! W& O1 f2 n+ f+ {
    } catch (Exception e) {
" J7 y! ]. }: T' I      System.err.println ("Exception stepRule: " + e.getMessage ());
! u/ m' n; I4 i! E) M    }& M: G6 s3 Z9 e, c: D1 {6 x2 {

  a8 ]/ i+ ]* r& Z4 _) `# u* a    try {+ b* B. _, x" }4 W0 b
      Heatbug proto = (Heatbug) heatbugList.get (0);! S8 U% Z3 }$ a6 t5 N% L7 [( x9 V% t4 F
      Selector sel =
' L+ O! E) c2 W/ Y9 z/ s( C        new Selector (proto.getClass (), "heatbugStep", false);
; l5 u. s" |: Z" O' \* I      actionForEach =
) p+ u. `, L/ L1 o2 P        modelActions.createFActionForEachHomogeneous$call
! |* H! _2 N7 m        (heatbugList,
1 r& \, C! C, U2 n+ A         new FCallImpl (this, proto, sel,
! y5 J; k1 A  T3 P. a8 h                        new FArgumentsImpl (this, sel)));
5 l% g! `: q' L2 \    } catch (Exception e) {1 W2 `( }7 }2 y7 ^  d; @# v. G2 f
      e.printStackTrace (System.err);7 E4 L. D  W, A9 U
    }8 t% V4 M( j" b- Y( M; C9 c  j  H
   
7 }6 l8 Q. c2 z+ P    syncUpdateOrder ();$ _% r3 |* b1 c  ]8 u9 U/ e; I" C0 K

, z' ]- i- X9 J6 Z$ @  B& S    try {$ L9 L4 S- g! {6 q; o: s, X
      modelActions.createActionTo$message
1 s0 I3 q% m/ P  G: c        (heat, new Selector (heat.getClass (), "updateLattice", false));
* m+ O5 F/ u( ]0 f    } catch (Exception e) {
( t- Z  l) M! |* R      System.err.println("Exception updateLattice: " + e.getMessage ());
* Q7 ^+ i! N; v# j. v$ h: T; `    }4 r" X+ E* ^: G0 m6 J5 T. ~
        
; z1 R# a4 h& z+ L    // Then we create a schedule that executes the
6 T4 P; I6 |6 X# n, f# V    // modelActions. modelActions is an ActionGroup, by itself it
2 }% R/ |: }) k8 `    // has no notion of time. In order to have it executed in# L" n6 p& A0 @& v& A: U# G
    // time, we create a Schedule that says to use the
! R+ I, v9 k3 A" _* Q( ^" y    // modelActions ActionGroup at particular times.  This
3 A- h" n, g# D1 ]/ i    // schedule has a repeat interval of 1, it will loop every
- v" r, W4 [! c, b& q    // time step.  The action is executed at time 0 relative to
9 F' F( [: A3 }% c7 w) p% K; f# J    // the beginning of the loop." u( @% y6 ?0 y! O5 f$ z
4 n% I  T! }8 v* _% M8 R
    // This is a simple schedule, with only one action that is
" h  P0 P$ i% q: K2 O! E    // just repeated every time. See jmousetrap for more
- e7 n! u- p% ?7 v$ ^    // complicated schedules.  o2 ?& a$ f' d# K2 S
  
8 Q* F1 F% [: Y9 d7 s; L- f    modelSchedule = new ScheduleImpl (getZone (), 1);
3 e' F. j2 r: j! ~" F/ o# b    modelSchedule.at$createAction (0, modelActions);$ ]/ `" J3 u' i8 [
        
/ g3 a0 [! @; Q; i( o  K    return this;) n$ f* w9 h9 y/ q
  }
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