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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:
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public Object buildActions () {. {1 X8 [- t/ {* Y* p
    super.buildActions();
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    // Create the list of simulation actions. We put these in3 K; s1 y# j1 @* A
    // an action group, because we want these actions to be
7 I* r, v! e( }# _- a    // executed in a specific order, but these steps should
" u4 e$ T; r# C2 _    // take no (simulated) time. The M(foo) means "The message
. ^7 t7 W+ @& {  i+ J0 M" p    // called <foo>". You can send a message To a particular
$ P# u& E$ K6 ~: W    // object, or ForEach object in a collection.
4 }: j1 ?0 y, `  E7 x3 U        1 P7 U( l/ A% L; V8 s, O# T* _- {
    // Note we update the heatspace in two phases: first run
$ i  N; ^4 z0 B( T( a( S2 L( F    // diffusion, then run "updateWorld" to actually enact the
/ M% i5 w* |, g/ }    // changes the heatbugs have made. The ordering here is1 \* u9 ]4 L( y
    // significant!! H4 h; b0 D5 w% {  N5 a8 j/ Z
        ' g2 {: h1 y" ?7 }$ d/ m
    // Note also, that with the additional
" [1 z0 q# N0 p0 ]    // `randomizeHeatbugUpdateOrder' Boolean flag we can5 ^; U+ F) c1 L* V$ ~
    // randomize the order in which the bugs actually run
! X9 q- y5 ?, @: \4 P    // their step rule.  This has the effect of removing any
8 t  B. b. O+ c* N5 _6 I/ p    // systematic bias in the iteration throught the heatbug+ {( M1 P8 h& v* C5 t3 F0 }5 ^
    // list from timestep to timestep8 h9 l: O/ r  J% o# K9 \
        
0 W: Q8 U) U) p    // By default, all `createActionForEach' modelActions have
7 C. W& H- {8 U/ `! F/ I4 X8 t1 Q    // a default order of `Sequential', which means that the! r2 V/ o2 A0 U( ~: _
    // order of iteration through the `heatbugList' will be
% q1 @" g' t7 }. R$ p    // identical (assuming the list order is not changed1 {# v# g8 k2 I' A  J
    // indirectly by some other process).4 P: _8 F/ R; i7 e
    # J- H2 K  `6 O) ]3 n: a
    modelActions = new ActionGroupImpl (getZone ());3 h, i6 c& J9 k& J7 o! L3 ~2 f% D; c, `

  x7 ~! a& z6 T8 O* A1 J7 f- ^+ V    try {
. Z5 @8 L& O: r; J      modelActions.createActionTo$message+ n; y& ^; [& R& r0 ?/ _% r
        (heat, new Selector (heat.getClass (), "stepRule", false));' U+ z4 u* I# G) O: Y
    } catch (Exception e) {
5 B) ]- H2 v+ Z" N; a# ^: o5 V" k5 H' Q      System.err.println ("Exception stepRule: " + e.getMessage ());3 E) A# F0 i) D- M. V
    }
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+ b, |/ ~1 m- v8 W    try {- L9 p2 Q! m& e/ }% }
      Heatbug proto = (Heatbug) heatbugList.get (0);6 z: n9 P5 t; R. e- J9 a
      Selector sel =
$ p6 G: o; m0 m% U        new Selector (proto.getClass (), "heatbugStep", false);' o) [% M! f! \- {0 `2 J# a
      actionForEach =2 E" H# q2 J: h/ W& \  x8 I
        modelActions.createFActionForEachHomogeneous$call
/ d0 _0 m) }7 H        (heatbugList,
5 B) f1 a! d  P5 @         new FCallImpl (this, proto, sel,
/ `: j- L! Z/ ^                        new FArgumentsImpl (this, sel)));
" ?! o- o- d+ V    } catch (Exception e) {
8 r3 ]0 M- T: J      e.printStackTrace (System.err);
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    2 W0 P7 f. C( W9 M* m8 y
    syncUpdateOrder ();
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    try {
1 N: ], Z6 i' P4 J      modelActions.createActionTo$message
+ W( A! i3 a& E        (heat, new Selector (heat.getClass (), "updateLattice", false));
4 r8 N. q/ u2 e0 ~9 _    } catch (Exception e) {- t# M. u7 @$ W: @& k$ A
      System.err.println("Exception updateLattice: " + e.getMessage ());* c. l- @* `" T1 I6 m, I5 o3 P
    }
$ S1 a+ x7 Q" R2 h; J% x% g6 Q1 r        3 ^3 B7 H% |4 ~! D; ^
    // Then we create a schedule that executes the& Z! j, r% G" ^$ b
    // modelActions. modelActions is an ActionGroup, by itself it
' R) e! D& g3 u) b  ?    // has no notion of time. In order to have it executed in, T- `1 |- S& J& a
    // time, we create a Schedule that says to use the
& ~4 \6 [% }( ]1 \, m3 o0 C7 B    // modelActions ActionGroup at particular times.  This
0 B( E5 B( r& U2 a    // schedule has a repeat interval of 1, it will loop every) T. B4 v6 J( V* w# P! t7 Q/ f
    // time step.  The action is executed at time 0 relative to! P4 ?, ~/ b5 i- m2 ]
    // the beginning of the loop.  G( j0 O- S$ \4 v- o

9 O3 ~, A7 |( z1 I: b7 F    // This is a simple schedule, with only one action that is
7 u1 y- k0 ?$ V% t* i    // just repeated every time. See jmousetrap for more
5 G2 c2 i% D1 A) b; @% U    // complicated schedules.
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    modelSchedule = new ScheduleImpl (getZone (), 1);1 f8 C' I- T, G- d* J
    modelSchedule.at$createAction (0, modelActions);
( n% G# \  |6 k5 N1 x6 ~        
( x2 O* y+ n# _9 |( M& q    return this;
$ D& v( U; O' p  }
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