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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
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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:) h* ]/ w" d  i* X0 M# i. H/ i( E! M
5 c0 Z% ]( X0 v6 H- I) I* a
public Object buildActions () {: `0 m# G3 T6 w; U$ `( X4 _8 @8 @0 P& V
    super.buildActions();
  [' J8 w- g% d$ J& ]    ; ]* L. H  P# x/ k/ Y' z; Z
    // Create the list of simulation actions. We put these in' V: v4 c& V5 |$ f
    // an action group, because we want these actions to be
/ `  u5 J5 K0 K: t+ T* S- ], R    // executed in a specific order, but these steps should
( A7 u/ H7 ^8 g( X% r: Y1 h6 {    // take no (simulated) time. The M(foo) means "The message/ g" d+ w1 y$ d
    // called <foo>". You can send a message To a particular0 ]) l: d$ z" r0 c+ Y, k' [1 q0 a
    // object, or ForEach object in a collection.
5 _3 {8 e" t1 o) x) w* f        
+ |8 Y1 I4 H6 S6 S  S/ K  G    // Note we update the heatspace in two phases: first run
2 Z( |" i+ {- \  L3 W    // diffusion, then run "updateWorld" to actually enact the$ _+ [! Q; X3 D7 z: o
    // changes the heatbugs have made. The ordering here is2 E+ m, S! I7 b$ z
    // significant!! \! X/ O+ d: y5 q
        
2 R6 s0 s4 y. C! w    // Note also, that with the additional
4 ^. k" D# F  w- I6 r$ U    // `randomizeHeatbugUpdateOrder' Boolean flag we can. Y4 X3 l! C' r1 d) X
    // randomize the order in which the bugs actually run: V  g8 \- N& N3 ]7 H# C0 F
    // their step rule.  This has the effect of removing any
+ v) O- ~- B- m5 s' Q$ Y    // systematic bias in the iteration throught the heatbug
% d. i- B- w/ ~$ F. h; k( R    // list from timestep to timestep& i* ^& g3 ~  r1 @* y
        
0 B) R7 P" F2 P- h- }    // By default, all `createActionForEach' modelActions have! S+ `( j7 S' A/ G# f% v9 C" B
    // a default order of `Sequential', which means that the9 M2 g4 W* J" l6 L, \
    // order of iteration through the `heatbugList' will be, @' G" [& c  V- D9 `, z
    // identical (assuming the list order is not changed
2 t" a) r' u$ w/ ~. |2 U  \    // indirectly by some other process).
  Z4 J" H/ R& _, w5 d, u   
. [; d" X! U3 W# W    modelActions = new ActionGroupImpl (getZone ());
2 M' f  _9 P" H7 y6 K
: h+ R9 F4 T, e1 @; i7 g' G# T8 G    try {  L6 E5 G2 L8 K# \/ |
      modelActions.createActionTo$message
7 V6 {: d: f" ?        (heat, new Selector (heat.getClass (), "stepRule", false));$ m& @* y6 _# x% f* H: u
    } catch (Exception e) {6 t' k+ w$ C. O, H  w2 L5 Y
      System.err.println ("Exception stepRule: " + e.getMessage ());, @( Z. G$ B( ~5 p0 D8 {# {
    }
  d! w8 d, @* O5 _
# ?% G& a1 _' ^5 U! p3 V; |' u    try {
) l( l* i+ i3 K5 s      Heatbug proto = (Heatbug) heatbugList.get (0);
. Y' A" o  S: h: S      Selector sel =
5 o! {5 |5 l$ w  t        new Selector (proto.getClass (), "heatbugStep", false);
3 d7 E3 B6 V! Q- X. \      actionForEach =
2 P4 u7 c2 E3 L, \& g        modelActions.createFActionForEachHomogeneous$call
) _( R. b2 |+ E3 H        (heatbugList,1 X0 i. Z& [: ^2 ?) A; U, }2 Z
         new FCallImpl (this, proto, sel,4 k3 M1 e+ s0 N- U9 F
                        new FArgumentsImpl (this, sel)));" y+ r& v* u  _$ O- G
    } catch (Exception e) {
* Y. P6 ~( W  ~0 d6 f3 s# y      e.printStackTrace (System.err);
' s* G2 K# y. k; K    }
9 U, l; @4 m0 R! l: P    % n2 }* @. Z' w; ~0 e. _
    syncUpdateOrder ();0 ~: Z& m4 N" m
& \9 y7 D1 K, ~$ N
    try {
& p: E9 u  G' p" n/ K0 v$ [6 A7 E6 Q      modelActions.createActionTo$message ) F/ n" a! I; U4 S' w3 ?8 F9 w5 G
        (heat, new Selector (heat.getClass (), "updateLattice", false));
: U2 c* d1 m2 u& x    } catch (Exception e) {
$ S, F  }' P5 R      System.err.println("Exception updateLattice: " + e.getMessage ());1 H- _& Z( }) V3 a. B  ~7 m) H
    }. n) F. X6 |! j+ g* Q* s# k/ P) o9 e# }
        
$ l/ M- ~& _4 [5 ]    // Then we create a schedule that executes the
% _" Z7 A0 E+ x    // modelActions. modelActions is an ActionGroup, by itself it
, {( ?/ F9 Y7 f6 l. N5 d. N' z    // has no notion of time. In order to have it executed in$ M1 q7 y# m  |8 Q# z
    // time, we create a Schedule that says to use the: Q8 x" E$ h% c" k
    // modelActions ActionGroup at particular times.  This
8 Z( `% ?2 W% A. w    // schedule has a repeat interval of 1, it will loop every2 w' O5 ]! L' X2 v# W; G/ k# N
    // time step.  The action is executed at time 0 relative to
: V$ V) z* K6 M, _( p8 e    // the beginning of the loop.3 N* ^, X# K& e) J0 J

/ ^% e- S  r; ^5 i    // This is a simple schedule, with only one action that is
# W" }$ S) b7 P# H# k5 Z    // just repeated every time. See jmousetrap for more
& t( _* U" }$ {& n/ n    // complicated schedules.! [& h  p4 }% C5 P. U
  ' I1 ~2 B4 ?/ `2 T2 S0 b/ _
    modelSchedule = new ScheduleImpl (getZone (), 1);! M7 I6 u: H8 ~& o
    modelSchedule.at$createAction (0, modelActions);- d( }) U$ ?* B, l, d' u
        
! n  W0 K: K1 M    return this;) W( T$ L* Y, [/ l
  }
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