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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:
# f; m- F. w# l. q
. `6 |4 h8 D$ T  V. R7 ?- [ public Object buildActions () {  Y2 T' F. G& N9 t' ~* O
    super.buildActions();
! b4 \( U& \# j' _3 [% L5 p   
; P8 ]& l" O* u. Y1 F    // Create the list of simulation actions. We put these in, W" a3 w" o. X6 A8 [
    // an action group, because we want these actions to be2 H( c5 H/ k6 ]  c/ x
    // executed in a specific order, but these steps should0 T( u9 H/ R( I7 y4 ^
    // take no (simulated) time. The M(foo) means "The message
( y1 [( ?( b2 X8 P6 C    // called <foo>". You can send a message To a particular. h9 Z- B) ?+ A# \+ u
    // object, or ForEach object in a collection.
, Y0 E2 `: H3 D2 v) J        
8 b% ~) @9 O" ]& Y    // Note we update the heatspace in two phases: first run
% D) A' o) a& m$ D) L; E    // diffusion, then run "updateWorld" to actually enact the1 o0 W+ ^. b9 Y/ n# a$ e6 g1 f
    // changes the heatbugs have made. The ordering here is4 Q4 {  k1 N* ^- T! b2 k
    // significant!
6 D& `) j+ E3 ?  x5 }* z  T        ( ^1 E/ W0 w; C$ p. E
    // Note also, that with the additional
' L% }% U: a" E9 l    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 ~3 {8 f( s9 ]
    // randomize the order in which the bugs actually run. s- g& O0 [& M' M/ b3 c3 P
    // their step rule.  This has the effect of removing any% f; ?' h* P2 Z# C- V4 o
    // systematic bias in the iteration throught the heatbug7 Q# _* T8 t7 R3 I* b" [  {9 `
    // list from timestep to timestep+ K- |% j* w2 @* w: w0 d6 b  S) P9 k& k
        2 p9 y  @( b9 N* m4 F, t5 u) c% Z4 g/ I
    // By default, all `createActionForEach' modelActions have2 O; Z) A+ M4 r# H: @4 o6 M
    // a default order of `Sequential', which means that the
7 F+ k* R/ `/ U) \1 r9 L6 c    // order of iteration through the `heatbugList' will be& }# |5 o9 m* g
    // identical (assuming the list order is not changed+ s8 o: X8 i* n& B' |
    // indirectly by some other process).
3 s  ^, b  F* s2 |    % V3 `. P9 v+ h- O5 q" T2 [
    modelActions = new ActionGroupImpl (getZone ());, A5 y# Z$ O# E+ P# q( s

. D: P0 _- k8 I4 C7 `& m    try {
9 L* \0 q; S5 b4 x1 T6 _8 r+ P" i; P      modelActions.createActionTo$message) ~. c5 _# p, x3 P( @- R
        (heat, new Selector (heat.getClass (), "stepRule", false));
% N+ V& h  n) p( q) F+ N0 W$ d) u    } catch (Exception e) {* Y8 B7 ^, ~& J3 O0 W
      System.err.println ("Exception stepRule: " + e.getMessage ());
* Q2 ]: P6 i; O' P    }
* N6 |3 R+ a( a  g$ B; a" |' _" q# I% ?+ w  e, |7 k5 _
    try {' K1 d/ C. O# Y5 ]) z3 f
      Heatbug proto = (Heatbug) heatbugList.get (0);
1 X6 W. r) p' U      Selector sel =
; D1 X5 O2 Y' ]4 B        new Selector (proto.getClass (), "heatbugStep", false);  _+ a& z& ^7 r' P
      actionForEach =
6 e1 Q7 L* Z% m3 q        modelActions.createFActionForEachHomogeneous$call
& }9 C' Y! R5 `7 i: T' a: \( g7 T        (heatbugList,
# n6 I: P0 B5 g+ F         new FCallImpl (this, proto, sel,
+ I) z) r# k8 Y  |! c) O5 P8 t+ d6 j                        new FArgumentsImpl (this, sel)));$ `1 d8 C, E! x! Q- ^+ E# ~& f
    } catch (Exception e) {, r& S, x9 q4 |0 a5 G  E
      e.printStackTrace (System.err);" _: \4 J9 @0 \3 K
    }
3 o7 I) U/ t3 C4 i/ q# u    0 B6 l1 r  T) `
    syncUpdateOrder ();
: ^3 ]5 P( a# Q. [, e  D2 \/ K% u$ q) q% c/ A
    try {7 {- @4 B9 u" J& C$ \, [
      modelActions.createActionTo$message 2 h& s, {+ u! }$ ]4 d
        (heat, new Selector (heat.getClass (), "updateLattice", false));
8 a) o& l9 R5 L( n    } catch (Exception e) {
. e6 A( s, t, p! \7 f# f- u9 m      System.err.println("Exception updateLattice: " + e.getMessage ());
, _% e+ x! I+ L    }
& Z- G; O; c3 V) H- a        
$ K9 w0 Q' L+ U! b) ~# ?    // Then we create a schedule that executes the
: O6 J% P. u' Z$ k. e    // modelActions. modelActions is an ActionGroup, by itself it
8 K' x5 d& a4 J# k6 H    // has no notion of time. In order to have it executed in
  \3 x" F# N; ]( p1 V    // time, we create a Schedule that says to use the
( c& C( l' w% T8 V, E    // modelActions ActionGroup at particular times.  This
5 [, X2 {2 C9 T* Q    // schedule has a repeat interval of 1, it will loop every2 p: k# {3 U9 \
    // time step.  The action is executed at time 0 relative to
2 C! _. S% k/ C9 Z. h3 F    // the beginning of the loop.
! H& N6 U" g) C' ^: v
% E# q" E9 k; e4 s( n    // This is a simple schedule, with only one action that is( P+ c2 w7 w, w
    // just repeated every time. See jmousetrap for more" |3 L3 W& D  y( B1 K
    // complicated schedules.
7 s' l. L+ H8 R+ C0 g; c  
5 ~/ ?& Z4 u* s( O3 P; @) I& {$ l6 A    modelSchedule = new ScheduleImpl (getZone (), 1);
: {. O% N* {7 N9 j, `" y    modelSchedule.at$createAction (0, modelActions);
2 z5 Z) S; E6 O' {0 t        7 M7 s! e1 f, s6 W. {6 w; I
    return this;
) ^, `% g, g  p$ a& P  }
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