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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:; {- V6 [: a5 L# M) q0 q# T
2 t, E# O, \, e! H5 v0 J8 M6 H0 x
public Object buildActions () {( V/ r: {4 Y) n4 _, ^2 a6 ~
    super.buildActions();5 q, ?% m1 T1 a1 t; H
   
+ L- r/ o1 x! P/ O: F    // Create the list of simulation actions. We put these in
: `% {1 t. v* k    // an action group, because we want these actions to be/ ?6 B- f/ K5 u( L
    // executed in a specific order, but these steps should. u1 D( X- N9 c+ A
    // take no (simulated) time. The M(foo) means "The message: u+ W9 `1 T0 k1 e% E% [, J( V7 F
    // called <foo>". You can send a message To a particular7 [: \0 H5 F. O0 C% @0 t
    // object, or ForEach object in a collection.
: q4 j7 S9 d" N# {3 K" Q        
3 q& i/ e* X5 p  v1 t* W$ |    // Note we update the heatspace in two phases: first run! ?- H1 M( q, S% G; }2 ^
    // diffusion, then run "updateWorld" to actually enact the
1 [7 ^) u% G  ~! w    // changes the heatbugs have made. The ordering here is  a% `& ?" F# G% M% a) s' x
    // significant!
8 c) g0 E, W& {( O& f+ b        
4 x4 D* O7 [) |" [" ^0 Z6 w% j  q    // Note also, that with the additional
" D4 N' y' x) }! i, ^+ q( I# V/ o    // `randomizeHeatbugUpdateOrder' Boolean flag we can, o6 i; w( @' T
    // randomize the order in which the bugs actually run
: I6 w: y, @8 e/ ~5 C    // their step rule.  This has the effect of removing any
# x" M8 q/ Z3 |' Y& S    // systematic bias in the iteration throught the heatbug# ^5 G2 i/ Z% e9 o
    // list from timestep to timestep
' b8 k( ]6 F+ @1 ?3 w5 R2 d        
: ~- c5 O  a, W9 e) V$ ~    // By default, all `createActionForEach' modelActions have" t) `. ?! }6 e; k/ {1 V" L
    // a default order of `Sequential', which means that the; q1 Z: Z' |7 z* g
    // order of iteration through the `heatbugList' will be- I$ ]* S8 _; h: G" `& |
    // identical (assuming the list order is not changed& f1 v( r# j3 G& \
    // indirectly by some other process).# `5 ]$ V  D% L$ m' _
   
9 V0 w' J: n5 i! y    modelActions = new ActionGroupImpl (getZone ());
, X; v: R/ V' y  j; Q- {! \+ M8 ^. x8 s: j; L
    try {" ~8 @3 D( [% [6 m
      modelActions.createActionTo$message+ `3 }9 G" r5 S9 l
        (heat, new Selector (heat.getClass (), "stepRule", false));, y# a8 ~1 q1 @6 H- b! ^
    } catch (Exception e) {6 U' ~4 S1 @& D# M: I
      System.err.println ("Exception stepRule: " + e.getMessage ());0 M; `5 v; [7 R
    }. O, @3 S/ V% T, p% M6 U; ]
- \$ \0 o. ?% e7 b- F
    try {# _- w: ?$ C8 ~0 h
      Heatbug proto = (Heatbug) heatbugList.get (0);; y5 |* O. ~' O; B* x
      Selector sel =
7 l2 q! z' i3 m9 q: w9 l* x( b( ^        new Selector (proto.getClass (), "heatbugStep", false);! K: a, {) x8 Y
      actionForEach =& i8 X8 Z8 G! S+ [$ T
        modelActions.createFActionForEachHomogeneous$call! B8 Z7 Z2 r( h( |4 W
        (heatbugList,2 b; g3 f# c6 I# {) @
         new FCallImpl (this, proto, sel,
# g. i! ^5 \4 ^) @& J" s" O) d/ m                        new FArgumentsImpl (this, sel)));
+ z% ]! A: M; a  c2 `    } catch (Exception e) {
" F1 i9 M' u' n+ _; T/ Z5 o      e.printStackTrace (System.err);  S6 w% P$ e/ Z5 K1 {. x
    }# i+ R0 x0 H! D2 z. f
    $ K2 ^" v7 B' w
    syncUpdateOrder ();2 A! [8 C. k, T, M5 L
4 A4 _- {: g% ^( l# N9 S* L; i
    try {
% ]2 a+ e5 H. ^! d( C      modelActions.createActionTo$message
, b* D* l) \; {        (heat, new Selector (heat.getClass (), "updateLattice", false));
! j! G# M' B! v; O: X    } catch (Exception e) {
- Q$ U8 J9 v+ |! O- \      System.err.println("Exception updateLattice: " + e.getMessage ());
+ [1 M3 Z( W9 v, R  Q    }
( }5 V( Q/ Z# q( j0 y        
+ V$ k0 ], f: S2 @    // Then we create a schedule that executes the
2 U: ^4 f. g. I/ e7 P9 p    // modelActions. modelActions is an ActionGroup, by itself it
$ G( p; s9 L% L; z: Q4 q2 m$ K    // has no notion of time. In order to have it executed in& w! l" s1 }# D2 ~' e
    // time, we create a Schedule that says to use the5 ]1 t' M: w* |8 R4 O3 e3 i+ c
    // modelActions ActionGroup at particular times.  This. b% U* p8 V% ]5 e" t7 ~+ M7 ?; \
    // schedule has a repeat interval of 1, it will loop every
  v0 p3 V% W7 i) `6 l8 U7 ~    // time step.  The action is executed at time 0 relative to; [( K" I3 p/ P& m
    // the beginning of the loop.- R# m( p' O* e: v; G" M" T

" u! ]3 j" S* O( O( Z    // This is a simple schedule, with only one action that is' \" }* M: q  y
    // just repeated every time. See jmousetrap for more
" |8 l9 A! G* g+ Y9 ]5 m6 S    // complicated schedules.. K3 W( J; Q: B4 \( K
  
4 R, E' L* |: b6 B3 D: Q% J* f    modelSchedule = new ScheduleImpl (getZone (), 1);
0 S: U, \, J* r. B    modelSchedule.at$createAction (0, modelActions);
0 D  y* }, X4 E/ h7 Y        
* \9 |4 P8 b0 h  W+ q% H    return this;1 O6 }9 |# C4 B* N. X9 }
  }
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