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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:; k# J) ]6 d- C, }

" T1 y. H( {, r public Object buildActions () {
% S! E2 ?  r/ {6 e( y% @2 O) X    super.buildActions();
4 ?) s# P6 Y+ k    : m9 M" j9 v! s% X5 A! }: \, g" Q
    // Create the list of simulation actions. We put these in
+ y7 a) W! h  B! a$ j% \1 m    // an action group, because we want these actions to be5 }5 |- u# F2 |& O* w" O& \
    // executed in a specific order, but these steps should
- Q1 \5 o% ~+ [! k- I& R/ y    // take no (simulated) time. The M(foo) means "The message
2 r; }" m+ `! p! C3 b; E9 p9 I    // called <foo>". You can send a message To a particular" n* X6 A2 p4 G! a7 `* {" |) v
    // object, or ForEach object in a collection./ Y9 `% K) u9 w: [' z7 O" E
        8 p8 E# d, P- V' M
    // Note we update the heatspace in two phases: first run% j+ R& T9 e8 m  \
    // diffusion, then run "updateWorld" to actually enact the/ Z% b( V# @* E3 h6 n- Y
    // changes the heatbugs have made. The ordering here is' y0 J3 Z" o5 x* ?9 h& u
    // significant!9 a+ Y4 b# E$ h5 L
        8 H, I* Z+ e9 |
    // Note also, that with the additional
+ \& }  _9 x, O/ r    // `randomizeHeatbugUpdateOrder' Boolean flag we can# R& Z" _* F8 V0 N% N5 i0 u0 F6 _
    // randomize the order in which the bugs actually run
* L  u! g8 W% f4 c" U2 [3 x1 a0 ?    // their step rule.  This has the effect of removing any/ ^' W# e- z3 X& M4 C
    // systematic bias in the iteration throught the heatbug, F* ]- ]# c5 m: `; J0 R
    // list from timestep to timestep. \9 E+ J4 D6 F
        
! I) o4 u$ H$ f) f" }5 b  \    // By default, all `createActionForEach' modelActions have
+ \, y. Z: `$ ^. d5 @, v    // a default order of `Sequential', which means that the
' d- z9 _( k/ H& A    // order of iteration through the `heatbugList' will be! r% t" V: l: l1 e% D
    // identical (assuming the list order is not changed  b3 v: B# ~$ ~+ F# f+ l/ f
    // indirectly by some other process).
1 l8 O6 T: m& \3 M# R1 s    " n) y4 L1 C" c* q, e
    modelActions = new ActionGroupImpl (getZone ());( l1 M) g5 Z* E9 T! S
2 @' A; U6 @, D/ _- W
    try {
( g8 v3 o" u2 v3 Z; H, U      modelActions.createActionTo$message( S8 i- [. K4 O/ |
        (heat, new Selector (heat.getClass (), "stepRule", false));
. V) i3 c) @: M+ A    } catch (Exception e) {  K' K- K) ]7 d
      System.err.println ("Exception stepRule: " + e.getMessage ());: V8 x$ m1 S/ ]" m3 D7 Z  {$ r) H% h
    }
, w5 f: u3 s, a& o1 i2 ~% |. j
8 n: h* O& W. _  L* A- W- v    try {* D5 _9 h- r' W' g( V
      Heatbug proto = (Heatbug) heatbugList.get (0);
' M2 @3 t+ E. n! y$ Q      Selector sel = ; p( o5 y& P; \4 S
        new Selector (proto.getClass (), "heatbugStep", false);
6 u# L$ P9 J" x) `2 j5 H      actionForEach =2 g* z. Y6 V/ ]1 V
        modelActions.createFActionForEachHomogeneous$call
& {" Q7 ^7 K# I, k        (heatbugList,
( ~0 L/ B1 K/ N         new FCallImpl (this, proto, sel,+ }! g: \1 c, w  W0 d, e- T
                        new FArgumentsImpl (this, sel)));
- R3 I; M/ y* V( h    } catch (Exception e) {
1 I) h" Z0 b4 ]# M0 S) S      e.printStackTrace (System.err);
7 ?  t" o' M9 u9 @5 Y    }. d0 S1 |7 [/ y4 m1 e3 A. J/ ^
    0 |" F9 Z* _2 g$ D
    syncUpdateOrder ();4 k/ J6 t5 S3 H+ [6 w
3 c( G; |0 }; P+ ~$ R7 F2 j
    try {
5 r5 }1 h, [+ R% H8 c      modelActions.createActionTo$message 3 G6 ~9 C3 F$ V7 M% m" A
        (heat, new Selector (heat.getClass (), "updateLattice", false));
) Q. j7 r3 {1 }2 v    } catch (Exception e) {
8 Q4 z( @4 O9 D      System.err.println("Exception updateLattice: " + e.getMessage ());$ u$ Y' h' e/ z" o
    }
# y! n! {% u1 ~        5 x0 Q) y3 z. V: {. P9 T, p
    // Then we create a schedule that executes the
9 z% R. ?9 D# @6 W' v. M    // modelActions. modelActions is an ActionGroup, by itself it
* e) \( {( l* r. \9 i    // has no notion of time. In order to have it executed in" p, V7 T; d% G1 m, |
    // time, we create a Schedule that says to use the
4 q! E+ e  p% i    // modelActions ActionGroup at particular times.  This' B) ]% i  p! W, [
    // schedule has a repeat interval of 1, it will loop every
! M# N6 R* z! Q' P3 O  v    // time step.  The action is executed at time 0 relative to
7 N8 Q6 t. j4 q, z( O    // the beginning of the loop.2 X) g0 L" l- D, q' r# T# g
4 \* z- J! I  x' C& y7 ^2 ^
    // This is a simple schedule, with only one action that is1 P/ M8 H, d+ U$ a+ C
    // just repeated every time. See jmousetrap for more- L) m0 {5 H& m1 L& v8 `
    // complicated schedules.
7 j% [4 U3 Q# ?7 l    t& f0 N! ?- Z; l
    modelSchedule = new ScheduleImpl (getZone (), 1);
" \. B1 Y" X, D' R# `    modelSchedule.at$createAction (0, modelActions);, J' \2 I$ e1 H, f
        
8 T' y+ ]* J1 I# q5 u    return this;
) i* T- K4 R- P( e  }
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