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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:
/ Q% \% f6 H6 m0 G& g* d
* h1 Q6 |0 [& r: B' _/ a public Object buildActions () {
( }' c) F& x. v3 O    super.buildActions();6 c* G: x/ [; M: v5 B2 @
   
+ O0 z, Q  f! V# q! t5 r    // Create the list of simulation actions. We put these in
8 ]) |3 u+ ]) z+ c( }    // an action group, because we want these actions to be
( A0 ~  \0 q* ]2 ~8 d0 p# g    // executed in a specific order, but these steps should$ F* o8 m' ]3 h; t# e! j
    // take no (simulated) time. The M(foo) means "The message* `' M+ G! Q5 L  C
    // called <foo>". You can send a message To a particular
7 }2 G' h+ g3 }/ K6 y3 p    // object, or ForEach object in a collection.
$ F4 \& P0 z% y% {2 h. m# e        
( d$ v, w% Z6 G) c( X    // Note we update the heatspace in two phases: first run
$ Y8 F9 e' l; d7 k) `! A0 ^7 M    // diffusion, then run "updateWorld" to actually enact the
+ D% [9 I* E, b, h    // changes the heatbugs have made. The ordering here is1 Q4 E& O5 p/ P5 z0 m1 z8 o
    // significant!
  f  u: E  c$ g# b        
* V- q9 k. D  G* T7 i7 T8 q    // Note also, that with the additional7 k( k' W2 O0 c
    // `randomizeHeatbugUpdateOrder' Boolean flag we can* X2 g0 X7 Z) d1 [, ~
    // randomize the order in which the bugs actually run
, K6 W/ y( P3 U& s    // their step rule.  This has the effect of removing any
3 c3 D+ t) _, \; O    // systematic bias in the iteration throught the heatbug- G( a( q0 e& ^
    // list from timestep to timestep4 f4 E2 ^$ G2 O  Y/ l6 t
        
+ i3 G7 u# [+ W% E    // By default, all `createActionForEach' modelActions have
) Y# ]* U1 V3 Q- x/ h/ J8 V* y. s    // a default order of `Sequential', which means that the% t7 ~2 {/ U! w- G# n& D1 I
    // order of iteration through the `heatbugList' will be# k5 t5 U0 A7 I0 M
    // identical (assuming the list order is not changed- j! @! [' _, A" Q- G
    // indirectly by some other process).7 B! y: X0 ^0 V# K" e
    $ K5 C$ r  F- h8 E
    modelActions = new ActionGroupImpl (getZone ());$ y+ K  A# k4 K( @4 Y# s

1 q/ q0 f2 ]8 q. J    try {' V' P" z! }+ _! {
      modelActions.createActionTo$message
  ?+ k$ T/ ^* D) T        (heat, new Selector (heat.getClass (), "stepRule", false));8 c- }; s5 H2 `9 v9 F
    } catch (Exception e) {
9 \- @0 ^# `& C0 z3 k      System.err.println ("Exception stepRule: " + e.getMessage ());+ S* O3 U8 o/ S! s$ h+ Q6 p& r
    }. c4 ^9 h  L/ y. X; H! \

+ Y0 d# I* M% F% G    try {
2 P% j- i$ w; n/ U7 Q/ O5 }      Heatbug proto = (Heatbug) heatbugList.get (0);
1 w+ }9 p. _: ]3 f8 Q  P6 G2 g% _% J5 O% j      Selector sel = ( P# K# H+ o& f/ J; U! [
        new Selector (proto.getClass (), "heatbugStep", false);
) X7 z, C) P& F6 b  B& ^  }/ f& l7 @) ]1 [      actionForEach =2 x1 I# [5 K/ ^  t
        modelActions.createFActionForEachHomogeneous$call
7 i& Y8 {5 {& l( V5 D3 K1 m* f6 z        (heatbugList,
- N6 f+ z5 m- X         new FCallImpl (this, proto, sel,
& r9 n) I! u: g! Z# g5 g5 e                        new FArgumentsImpl (this, sel)));
' s4 K+ H3 H/ H& d; Y( S# S6 s    } catch (Exception e) {# x  g8 A5 [! j9 z+ r( e, N
      e.printStackTrace (System.err);
4 E  p# _# r+ N( ]6 U    }
0 |& G" S2 O0 z/ u6 N   
* ~3 J/ C. b! A$ G6 ^) G: L7 Z    syncUpdateOrder ();
* n% K  o/ Q3 F' }+ J9 [5 i& n% m( D3 s/ m' A5 h# C
    try {
( d1 L$ D) h4 u+ a: |" O7 F% i      modelActions.createActionTo$message 1 Z8 D$ x+ Q) [
        (heat, new Selector (heat.getClass (), "updateLattice", false));# Q5 G7 w" `" C# e0 k" b" D
    } catch (Exception e) {# I. y* O4 `& L* J0 L2 P* w0 I
      System.err.println("Exception updateLattice: " + e.getMessage ());
' I) ?/ {; [' O- [7 a9 B    }
, z2 @$ {3 S6 {$ q        
2 S% W3 Y4 P- B! e1 F5 c* _0 m    // Then we create a schedule that executes the
! r9 Q* [: B. v; z) J    // modelActions. modelActions is an ActionGroup, by itself it
" ^$ N/ e6 z7 K3 r$ r* H5 c    // has no notion of time. In order to have it executed in# C7 @# B  Q& s; r, ~: H
    // time, we create a Schedule that says to use the7 A2 z+ W% T9 C2 d% V) ~9 Q
    // modelActions ActionGroup at particular times.  This3 [$ U2 ?: N" ?# }8 u
    // schedule has a repeat interval of 1, it will loop every7 h5 V. V+ D- x# q  M2 w1 t
    // time step.  The action is executed at time 0 relative to' C2 |2 B  h* `" U9 a$ I8 y
    // the beginning of the loop.2 k; v. i: A. _: d9 P% F: g
/ c$ {4 E6 F8 s7 e
    // This is a simple schedule, with only one action that is
7 t* X, _0 Q4 K+ l& r! C4 Y. k    // just repeated every time. See jmousetrap for more
- W& Q. O& |8 P+ U; h+ W' c    // complicated schedules./ \8 W. u6 y9 ^; T) S9 O6 G
  
: q; |( j& f- e4 c' n0 S    modelSchedule = new ScheduleImpl (getZone (), 1);+ T) [9 v) X  ~9 }' M
    modelSchedule.at$createAction (0, modelActions);
5 B* S* K  X- J$ h) E        
+ V# `/ u* q' W& d% G    return this;
% J# j( w4 {4 I% Z* p9 W& C1 D  }
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