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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:
% [$ X$ E6 }: x
/ `. L. T* d* Q) g- q public Object buildActions () {% A7 @9 b3 Z2 j+ x" n# g
    super.buildActions();- j* D8 Q9 ]0 T8 m/ e* V; F
   
0 t/ \2 h$ z" C: ~! I+ i; w    // Create the list of simulation actions. We put these in2 S* e+ p' p6 [7 Q
    // an action group, because we want these actions to be
0 _  l& w; i1 a! {  N    // executed in a specific order, but these steps should
9 v' o  V! v/ a    // take no (simulated) time. The M(foo) means "The message
3 g8 x8 R; S1 f+ Y( k7 d    // called <foo>". You can send a message To a particular0 O. A0 z& J2 J7 Y  M: b
    // object, or ForEach object in a collection.
+ |& ?& g2 Q6 a) }) O/ [! w% X, `        
! Y5 t% d/ H$ m    // Note we update the heatspace in two phases: first run% Q% N5 R- c+ G
    // diffusion, then run "updateWorld" to actually enact the
  I# |* {* v& Y2 x0 s+ q    // changes the heatbugs have made. The ordering here is& g" e9 `) u( d( U3 R
    // significant!
" v! \5 H6 `3 p+ Q! E' i$ u        
) D, f$ |0 k( R  x% ?' X$ r5 G7 M( N4 F    // Note also, that with the additional
- M- c0 T8 _/ t0 ]. Q+ m    // `randomizeHeatbugUpdateOrder' Boolean flag we can$ F. I1 i/ ?, R5 H1 i2 ^% J
    // randomize the order in which the bugs actually run& l8 p( f8 j( z, a+ ]: w3 c
    // their step rule.  This has the effect of removing any
+ y1 \) p7 ^8 [    // systematic bias in the iteration throught the heatbug
( h% n- f' Y$ e( L' m: b    // list from timestep to timestep5 \. A0 H# b4 c# ^' b* ^
        
; D5 c+ Y7 V# A) _    // By default, all `createActionForEach' modelActions have1 b( T0 ~" }8 y
    // a default order of `Sequential', which means that the
3 l$ V. q. p" V: w% a, J! R    // order of iteration through the `heatbugList' will be  j& C4 {6 H& s3 m6 X0 f. T, o
    // identical (assuming the list order is not changed0 T0 G2 D( n2 n/ @# Z# U: r
    // indirectly by some other process).
* V5 U! w5 N1 P  o# Q5 d2 H    . D) ?3 ^4 |! G
    modelActions = new ActionGroupImpl (getZone ());
% a. T  Y4 x& \
/ w+ m* F2 q5 o* M    try {
1 z& e2 ~4 ?: x4 c, c  N+ l      modelActions.createActionTo$message$ C9 D' K# d+ n+ p/ w  x) q
        (heat, new Selector (heat.getClass (), "stepRule", false));; q* u+ h1 ^6 I  H# Q1 w
    } catch (Exception e) {
# t; K( l3 k; G9 o3 ~- j      System.err.println ("Exception stepRule: " + e.getMessage ());5 I: M6 r. y3 H- a" m
    }) T' g, e1 w- ], V; E7 z+ U

; Z" m8 ^4 Y1 p    try {- J$ F& G: ]; `8 x; S* Y9 W" ~) G
      Heatbug proto = (Heatbug) heatbugList.get (0);
. N# T  A' {# R& o9 u% _  F5 `      Selector sel = " {1 A- f/ h, W1 \( l
        new Selector (proto.getClass (), "heatbugStep", false);
, p3 p! M0 W9 R. T" b      actionForEach =
2 _/ R3 e& Q2 Q9 _; E8 s        modelActions.createFActionForEachHomogeneous$call
2 c$ L5 f+ Z8 t* R        (heatbugList,
  b8 F! O- d+ v9 U7 l$ O$ G& U! u& h         new FCallImpl (this, proto, sel,7 {, c, v2 _* y$ \4 w" ]$ n0 P
                        new FArgumentsImpl (this, sel)));
& D  |5 D/ y; ~    } catch (Exception e) {
0 t1 w4 |+ y7 {& z: {. J2 _      e.printStackTrace (System.err);
. k& W/ l' Y' n  w# V    }* F/ h5 x3 e& X. @1 Q$ r
    5 O$ j$ |, o0 t2 ^% `
    syncUpdateOrder ();
0 }% E8 B7 N( x
+ s9 G; _  P1 T8 D    try {
; `4 D, n* f% j3 f0 |, R      modelActions.createActionTo$message * `- |7 c: B/ y. U# u- Z/ N
        (heat, new Selector (heat.getClass (), "updateLattice", false));
. g2 _$ a9 a6 N% i3 C    } catch (Exception e) {* d/ [% Z3 [& B2 i
      System.err.println("Exception updateLattice: " + e.getMessage ());
& h5 e) o- ^; p/ Q- [" O9 Y" o    }
' f0 M) [+ I: t6 D        ! e/ O, T# J& @# v$ d+ g+ S; O
    // Then we create a schedule that executes the
2 k8 o  t9 w% C5 K+ K5 u( \- a8 N    // modelActions. modelActions is an ActionGroup, by itself it
4 A* p3 t5 @: ^8 k: c% F. T    // has no notion of time. In order to have it executed in
- H9 [- J; q; d; u    // time, we create a Schedule that says to use the5 A+ o/ s3 Y4 r' t) ?
    // modelActions ActionGroup at particular times.  This" r# {6 e9 Q7 M" ~& H0 L1 _: h
    // schedule has a repeat interval of 1, it will loop every
5 x7 c" D$ J: n- ^9 u8 B  d/ F( v# S    // time step.  The action is executed at time 0 relative to: m$ I) j% w) [3 b
    // the beginning of the loop.( e4 l  z, X, E1 }( Y% o
2 K  a/ f  e5 E  ]4 @- B' ^
    // This is a simple schedule, with only one action that is& f0 z1 m$ w) E/ p# i# C
    // just repeated every time. See jmousetrap for more$ E: N; g3 J$ c3 M! X" |
    // complicated schedules.. A: F; @, N8 y, o# Q& r$ X
  ! x6 E" H9 a2 _/ f* J
    modelSchedule = new ScheduleImpl (getZone (), 1);; Y# N" e5 j/ n( f! [  ]$ E
    modelSchedule.at$createAction (0, modelActions);. K( K" I. [! N1 Y5 _" g
        
, [( R! P  c* k! E9 e' l; ^# H    return this;
, U* X( r' r7 E* F8 W, d% @9 l  }
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