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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:% |3 V- `. ^9 q+ V

5 R( E, ?( W7 o. x: z' j" o) ? public Object buildActions () {
' ?+ ^" K  H- A4 n    super.buildActions();8 k7 f9 C0 v9 t. w( h! {1 t) w4 m
    % R7 a' g# ?9 n7 T$ Q2 Z$ |# k
    // Create the list of simulation actions. We put these in9 X, a5 \- N0 }1 F* m1 U, r1 C6 u, U& D
    // an action group, because we want these actions to be
3 T/ K& M; x# P1 E0 _    // executed in a specific order, but these steps should& s0 z. U% K, r5 I% @
    // take no (simulated) time. The M(foo) means "The message" P5 O% f7 o( H5 Y. J8 L; t7 ]0 d
    // called <foo>". You can send a message To a particular/ V2 i! ]; e2 {# _) o
    // object, or ForEach object in a collection." }) M) J7 U, \4 @, Z& u3 E
        - ]/ E3 _4 Z# V' L5 j
    // Note we update the heatspace in two phases: first run8 D( X# G$ R9 G1 b
    // diffusion, then run "updateWorld" to actually enact the9 E* j4 Y5 M4 @# u/ ~4 k+ y
    // changes the heatbugs have made. The ordering here is7 c8 H# a4 h! `1 a2 o$ E
    // significant!1 @$ o% g: I; b. K+ E
        
9 {# R6 K% r: f% ?* d( U% q) n! q    // Note also, that with the additional. G* s9 E2 }) @
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 x3 P0 b6 }# u8 j! X0 q    // randomize the order in which the bugs actually run
! j' `" _' S: L+ Q    // their step rule.  This has the effect of removing any* a! [  S% V5 E) v
    // systematic bias in the iteration throught the heatbug( U# N1 q* Y; a7 I+ g$ Y9 O9 {
    // list from timestep to timestep
$ ^: X: z7 b3 a7 T, k& m: W        
5 V, q  J6 L# @& b    // By default, all `createActionForEach' modelActions have, K1 P0 p0 x) C
    // a default order of `Sequential', which means that the
3 H- {: n+ P1 w( r    // order of iteration through the `heatbugList' will be
: t4 x+ }$ V) v, Y; s3 v( ?    // identical (assuming the list order is not changed
7 L% v. u6 A  Z4 d1 H    // indirectly by some other process).
# v: ]- q+ H# r# Q2 S+ y   
. M. y9 H: r3 c+ p% Y% g    modelActions = new ActionGroupImpl (getZone ());
6 K" W7 D. k7 r3 `) s1 h/ b3 X8 d% b2 }! @) p% g
    try {
0 [7 q1 K( R8 ?- C" M" q2 l: E2 |      modelActions.createActionTo$message1 N; ~/ q; N, Q  ~7 y
        (heat, new Selector (heat.getClass (), "stepRule", false));
  \6 j# _  I, b( n' ?& V    } catch (Exception e) {
0 ?: F" u- d! X" ^( y. `$ E$ l      System.err.println ("Exception stepRule: " + e.getMessage ());0 r+ K; t6 J5 ?9 q. E2 w7 x
    }3 t/ u, }6 h- i4 _) C
! [8 U0 ~3 Z: T" P" g
    try {8 ?* h9 U4 A5 ~4 W8 O
      Heatbug proto = (Heatbug) heatbugList.get (0);
9 s# b+ r# P- B      Selector sel = ! @# q* Z7 b: N2 i/ c3 E
        new Selector (proto.getClass (), "heatbugStep", false);5 V. D7 ^( D* I/ }# h7 D
      actionForEach =  @" ]3 }8 U5 p5 H( B( d! c+ i# }
        modelActions.createFActionForEachHomogeneous$call9 B: W9 P1 B: M
        (heatbugList,& x9 v  A: @2 z5 y. }) \4 Z
         new FCallImpl (this, proto, sel,; C" h) A* M: r& ^- Z8 k
                        new FArgumentsImpl (this, sel)));
1 c& B7 L. W- j) N    } catch (Exception e) {
, _* d4 x  A. r" Z* h+ t! N      e.printStackTrace (System.err);- j" p5 N7 Z+ Y, b* G" P- ?' J1 l, t
    }! s5 T3 m. {& n" o* m$ ?% t
   
; A0 c! f+ R" {. u9 ~    syncUpdateOrder ();
! b; ~% m: M/ @' X7 S8 I. a3 x
    try {
5 I, Y0 ^0 X  }: P/ c- O, ^      modelActions.createActionTo$message
4 [% L3 e9 |2 ?        (heat, new Selector (heat.getClass (), "updateLattice", false));
* q7 V: o/ |5 O* {. v$ z. B    } catch (Exception e) {
3 o% J/ x+ x  L8 D( \      System.err.println("Exception updateLattice: " + e.getMessage ());
6 h) m; K" b5 T1 a    }4 x* f; k- {+ h% t3 x9 {8 i; y# b. q
        
# N" K* \/ g8 l    // Then we create a schedule that executes the
# y* R! K: A: }- j6 Y, I2 v& Q    // modelActions. modelActions is an ActionGroup, by itself it
' t5 s$ P- \1 \+ k# \& @    // has no notion of time. In order to have it executed in
0 [0 O( A7 g- T) h+ ]  w    // time, we create a Schedule that says to use the' L/ A6 c7 O+ a8 @& c2 [& w; M/ y
    // modelActions ActionGroup at particular times.  This' K# v$ Z4 @4 q; B  W
    // schedule has a repeat interval of 1, it will loop every
: B( D  L3 g4 J% f' I4 }5 d, M$ P! R    // time step.  The action is executed at time 0 relative to
1 ^4 b' k/ o! D9 `6 V; `# ?5 o5 l    // the beginning of the loop.. u: E/ p& V6 F( [

7 [5 L" p+ M* l8 ^* t    // This is a simple schedule, with only one action that is1 Y5 }( `4 O6 Z1 |, k& }
    // just repeated every time. See jmousetrap for more
& M! D, t( b! {1 p1 ]    // complicated schedules.
8 f" ]; ]( {  T) T) I+ I  
0 M0 C5 G2 P( o5 X- V    modelSchedule = new ScheduleImpl (getZone (), 1);  ]3 T0 P1 |6 ^. K8 T
    modelSchedule.at$createAction (0, modelActions);
! o$ v. \' O/ U/ b        4 Z. S& t+ |  [* W, X5 @
    return this;
. c' J% e5 p# N3 l; n9 c* {  }
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