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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:
7 _0 D6 O2 M) h" D1 f- i5 h
& Y2 s' @  ?6 y7 l, B8 e public Object buildActions () {
, z9 G8 X5 l  x7 x    super.buildActions();
: t2 i/ B- J( u' F1 c4 j' H   
. z5 w8 y  \1 k    // Create the list of simulation actions. We put these in2 ^( f! y5 L! T+ \8 `; Q
    // an action group, because we want these actions to be
, U' f/ |0 m) G) q9 U  V, S    // executed in a specific order, but these steps should/ v  Q$ X; R4 m- m8 z& w
    // take no (simulated) time. The M(foo) means "The message
6 L! _, n  a/ m5 Y7 r  m    // called <foo>". You can send a message To a particular
) x2 \  u. W2 b  p4 d9 n" f( Y; p7 H    // object, or ForEach object in a collection.
! q6 D! d- l8 z' W        * l! P% n- I; p! z0 L) Q& O
    // Note we update the heatspace in two phases: first run
7 u7 K! ]  j) o* j+ ~' _    // diffusion, then run "updateWorld" to actually enact the+ y4 J* F& @5 c8 h
    // changes the heatbugs have made. The ordering here is
+ O8 Q1 ~7 T5 N7 w! x; y( ~/ r5 k    // significant!
0 S( P5 ~1 ^: N# F. q        
* ^* [8 Q" D7 k4 l: u    // Note also, that with the additional
' i( I/ ]/ c7 _: W    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# ]4 Y) B5 w% _    // randomize the order in which the bugs actually run
* a3 ^7 K3 y6 `$ ~' W% J" P/ r' W    // their step rule.  This has the effect of removing any- r6 ]8 J% p% f# o+ ~! ~: O
    // systematic bias in the iteration throught the heatbug
) Y4 _$ q3 U' g0 X6 V# |0 s    // list from timestep to timestep: G& A/ U* E7 L8 s3 z" ~8 y7 ]
        
- ~; F. N, n1 }+ F9 F    // By default, all `createActionForEach' modelActions have
9 R- s5 O# i! ^    // a default order of `Sequential', which means that the
- {/ ?; w" C1 f- h    // order of iteration through the `heatbugList' will be
$ v1 R+ f4 ?9 _( X    // identical (assuming the list order is not changed
' C$ U' y2 b  G  U  W$ a    // indirectly by some other process).3 c& N% `. w' X$ h) B) s& \9 u
    6 f# n  U3 U; ]( b' L
    modelActions = new ActionGroupImpl (getZone ());
' M5 W( l. R% @" ?1 I: l& P7 {9 Y6 ^; Z+ X' a1 D
    try {! X' V9 l+ s- Y3 `* _/ C) u
      modelActions.createActionTo$message
9 s7 U+ O9 A8 n: p7 f  O7 p        (heat, new Selector (heat.getClass (), "stepRule", false));
1 A1 u% K7 w+ j2 `    } catch (Exception e) {
3 S' x( M3 \& I, g. a      System.err.println ("Exception stepRule: " + e.getMessage ());
  y0 v% u) J0 r  X7 |5 F8 R7 a    }/ r7 n- c$ r; D5 ]
6 H5 l* t4 J$ H( r7 s  X
    try {
2 ~3 Z$ |: n; B) ?5 e5 C2 {      Heatbug proto = (Heatbug) heatbugList.get (0);2 d8 s: H" n* x
      Selector sel = / D; F1 Q; j5 W2 O" u* N  Q+ `" i
        new Selector (proto.getClass (), "heatbugStep", false);& @  O4 A3 t: O' T/ C
      actionForEach =
- J/ `0 N! t* H9 n3 k        modelActions.createFActionForEachHomogeneous$call8 @/ x! c6 l7 i' D* Q
        (heatbugList,5 G$ [& v  h/ E& J, z
         new FCallImpl (this, proto, sel,
! q6 C( h# _8 \' s) T) G                        new FArgumentsImpl (this, sel)));
0 Y6 \9 S; O  }8 t/ x  K" W& U+ |3 P    } catch (Exception e) {+ B" `! c% W9 T0 H/ g/ ]4 x, Q+ l
      e.printStackTrace (System.err);
- r. {- j  r$ a5 h, v    }! `7 t1 Q% @$ }
    0 @3 D! O" K! w( M
    syncUpdateOrder ();) G. j  v6 [: z# p/ Z# x5 E

" u7 O9 z+ M  _5 ~, b# N    try {
- n  q; X. ]# I+ a; z, c      modelActions.createActionTo$message 7 B, v8 ~8 l6 z( s3 e" D
        (heat, new Selector (heat.getClass (), "updateLattice", false));
6 v6 @4 l  h& g* a$ J$ r- ^    } catch (Exception e) {2 O$ {$ n% O' X6 }  [0 c$ ]
      System.err.println("Exception updateLattice: " + e.getMessage ());5 ?' X6 `5 j9 Q9 U! W
    }
- Z1 `. k$ c+ ?& ?% C        
# y( D+ @5 T. Y( C! s& B    // Then we create a schedule that executes the. j+ w9 B  h! K; N* H' X) ?9 t  `
    // modelActions. modelActions is an ActionGroup, by itself it
3 Y) k: M6 l0 t8 t    // has no notion of time. In order to have it executed in/ c+ M4 X: w- L) C
    // time, we create a Schedule that says to use the6 P: W; M% T8 T+ `$ g/ \5 u
    // modelActions ActionGroup at particular times.  This. q& w5 {1 y5 ^* Q2 U  C" H
    // schedule has a repeat interval of 1, it will loop every
# e# b) E1 ^& r8 p    // time step.  The action is executed at time 0 relative to% \# ^% z( T0 @
    // the beginning of the loop.
$ w/ L" p. c. Q/ t* G* i
9 l% U0 }. ^" ^7 A) z3 d- J    // This is a simple schedule, with only one action that is2 \1 M" N  f! u1 @- x7 ~0 x, T7 X
    // just repeated every time. See jmousetrap for more
% t4 n. B. s! N) U5 r! e    // complicated schedules.0 k' f5 o( D8 y( }
  8 I+ d3 T* x9 X; ]' ]( n
    modelSchedule = new ScheduleImpl (getZone (), 1);
: {4 ?3 `+ X9 b5 Q4 E7 N    modelSchedule.at$createAction (0, modelActions);  @+ e, e; C1 Q- K+ Y( v
        
1 a, W" v9 X* O$ J; X    return this;
% S* I6 x' y3 [  h) c  }
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