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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 () {0 L$ ]: l/ t1 s+ X  o
    super.buildActions();
7 g+ A# F. H5 N$ Z. G; U1 t. d   
5 h) b9 {* I& t# ?- w* O2 z    // Create the list of simulation actions. We put these in$ g6 `% G" `5 G! x
    // an action group, because we want these actions to be6 @, T" r* [/ [: i% z: P
    // executed in a specific order, but these steps should
" \% U7 d  L) S. y$ ~4 {  a' l4 D; Z' f    // take no (simulated) time. The M(foo) means "The message
+ y$ \% I' B9 _6 G$ ]4 p% f    // called <foo>". You can send a message To a particular
1 Q, H/ p" k( W1 h    // object, or ForEach object in a collection.3 B/ ^! g6 l* n0 n
        
' H. Y$ o4 o8 X: k* m6 [% r    // Note we update the heatspace in two phases: first run! f! P- W9 N2 v5 N% W) J* g
    // diffusion, then run "updateWorld" to actually enact the- W) G- h! m4 g( f
    // changes the heatbugs have made. The ordering here is4 d0 w7 l- m' a+ w; Z/ P
    // significant!# ^7 |; O4 f2 |9 u
        / O3 s4 ~4 O: ?- b+ F
    // Note also, that with the additional
0 N- \1 f2 R- J" \' E8 [    // `randomizeHeatbugUpdateOrder' Boolean flag we can
& p4 M* o* G: j. `: r( Z    // randomize the order in which the bugs actually run  ^7 |' d% {( h. i, o
    // their step rule.  This has the effect of removing any; {; n3 G9 e. D% i
    // systematic bias in the iteration throught the heatbug
, Y! o" m7 E/ |1 V% F. i& T8 b% c# T+ M    // list from timestep to timestep
& l; C3 U( t8 Q' g8 `        # X2 W3 b7 o/ `) f! d5 |/ S
    // By default, all `createActionForEach' modelActions have/ N- v" t6 K# R. ~  y! a
    // a default order of `Sequential', which means that the
; s/ R) W9 f3 K& m    // order of iteration through the `heatbugList' will be7 w) q9 a! F& G6 j7 y
    // identical (assuming the list order is not changed. n* u; R3 p) S8 z1 Z
    // indirectly by some other process).' E" h5 l: h" R5 z3 |2 |
    : B$ A+ N/ r; F1 s( l
    modelActions = new ActionGroupImpl (getZone ());
* z+ o& t5 b, {# G; z
; s9 \. Y1 C: p- Y    try {; D" @3 |% Q1 {: j* ~
      modelActions.createActionTo$message! E* k, F( i' ]
        (heat, new Selector (heat.getClass (), "stepRule", false));& S( Q1 s# m" l) ?& s5 ^$ y
    } catch (Exception e) {' ^. l+ h6 S7 e1 M
      System.err.println ("Exception stepRule: " + e.getMessage ());
( G+ j9 K) }/ k; E* d    }
7 V8 e( J" R/ r2 e$ V! z: ?$ ^6 w( ^2 y
    try {" m1 S' X$ v! {$ g
      Heatbug proto = (Heatbug) heatbugList.get (0);
# p6 R( [0 J% O3 [8 I  }3 r      Selector sel =
) D& V/ R' b( F, S        new Selector (proto.getClass (), "heatbugStep", false);) @1 s% r' n' O1 p6 E/ x/ @
      actionForEach =& _! R* {& y$ T3 _/ ~9 _$ e0 E
        modelActions.createFActionForEachHomogeneous$call
: s5 r4 }* v6 A0 ~8 _/ }) l        (heatbugList," Q. G4 k( V; x/ ]
         new FCallImpl (this, proto, sel,* X' K9 t5 a3 B& B1 k
                        new FArgumentsImpl (this, sel)));$ e- g8 B# @' `
    } catch (Exception e) {7 _$ B& Y( R; X+ t# G9 I- F) s
      e.printStackTrace (System.err);
0 V6 A: f. K* @) D5 ]' B9 b6 \    }3 S+ x" r0 v: R& p. a
   
: E+ z, m0 M+ @" m1 F    syncUpdateOrder ();7 Y% q/ B$ J: i, A; ?' K
+ s! {( Z! l; w. `  X( ~" f
    try {4 @. [# X2 a! s& G
      modelActions.createActionTo$message 6 o* [7 i. u, g7 H' ]7 r
        (heat, new Selector (heat.getClass (), "updateLattice", false));0 t1 q9 F' r: l& Z4 l# K
    } catch (Exception e) {
+ @7 e. f/ c# l: S      System.err.println("Exception updateLattice: " + e.getMessage ());% A8 q: U5 x, h, n# y+ r7 M
    }7 [3 C0 J7 x4 j1 d+ k3 e
        
! E0 Q1 w# o9 J8 ]& T( `4 T" V    // Then we create a schedule that executes the- e! ~3 i" j* v3 _( N+ _
    // modelActions. modelActions is an ActionGroup, by itself it# x) m# c! }7 J8 c/ o  S) w
    // has no notion of time. In order to have it executed in+ H9 x: H+ o. v: \
    // time, we create a Schedule that says to use the
4 H( S( t( S" }3 a, j- f' |    // modelActions ActionGroup at particular times.  This# G7 a* T/ R, \  l9 q8 @+ G
    // schedule has a repeat interval of 1, it will loop every! S3 A" u) v1 q* E7 F
    // time step.  The action is executed at time 0 relative to: W8 X- B& Z* l: O3 }9 f
    // the beginning of the loop.0 q9 s. }1 l$ ]9 K: n* {: y% k

$ k0 W6 ?! P& ]5 @7 ~2 c+ L    // This is a simple schedule, with only one action that is* c8 |( u8 s( j0 `! [5 b( F+ |
    // just repeated every time. See jmousetrap for more
% W' ~) g2 h# d* d& C! `# s    // complicated schedules./ d5 t' s+ ~4 O8 ^
  8 s9 t4 ]5 }% m% A
    modelSchedule = new ScheduleImpl (getZone (), 1);
7 R' s9 }4 t1 b; s! Z- H    modelSchedule.at$createAction (0, modelActions);6 ?' q& K2 b7 z* n! M6 m' M
        & e" k7 U7 [/ m
    return this;1 M2 _8 `9 T- d
  }
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