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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:4 }1 }3 Z9 t& u! a, @% _& {

- `* W  v8 n2 s* g7 W public Object buildActions () {. J$ |  U4 d* Q7 {+ w* v
    super.buildActions();
5 v& I6 H, ?1 d/ L6 D   
+ M) }3 u* j. i3 r& [3 w    // Create the list of simulation actions. We put these in0 C+ W5 _; S- u( \2 f6 s
    // an action group, because we want these actions to be
% W3 I& h& G6 F7 J/ e2 O3 V& k    // executed in a specific order, but these steps should
7 s+ q3 }7 p/ I1 v4 n5 i$ q* L$ U# E    // take no (simulated) time. The M(foo) means "The message
" p8 k  P/ c1 D& Q' L* `) a$ `    // called <foo>". You can send a message To a particular" O; e+ r- N1 F+ o  Y& I
    // object, or ForEach object in a collection.
6 Y  T+ I5 t+ r        
3 N8 M8 t# K1 x/ U/ H' V    // Note we update the heatspace in two phases: first run
3 G; s& W0 P# X/ G    // diffusion, then run "updateWorld" to actually enact the
; g8 m% p2 q# l: Q) [4 b    // changes the heatbugs have made. The ordering here is; j9 L3 W/ M0 w; B# |
    // significant!0 X: r, Z+ h, I7 r/ H6 t- b6 S/ S2 y
        6 `1 T2 [: e% s. D
    // Note also, that with the additional
, v  b* u3 o) U6 @+ ?1 D    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 n3 O9 ?, B$ `' u# ?' @. Q
    // randomize the order in which the bugs actually run, T* p7 t+ _2 `3 x4 S7 [4 D
    // their step rule.  This has the effect of removing any7 G9 K# ]7 P! _4 _# o4 }3 @
    // systematic bias in the iteration throught the heatbug
! T, n; @3 J: R" C; S    // list from timestep to timestep5 R! N4 N7 R5 M/ z  U
        
4 Q7 r. {7 R0 {* b% \0 A8 j    // By default, all `createActionForEach' modelActions have
* ^$ B$ B# y% O    // a default order of `Sequential', which means that the$ n9 m8 X/ s" _5 U3 ^' Z
    // order of iteration through the `heatbugList' will be
7 r6 N  L0 J& w8 G: x& N    // identical (assuming the list order is not changed
( ^- \: a" n* P    // indirectly by some other process).
' Q- c* a3 x( g: k; m    # o' [1 P# |2 r6 D  K. x
    modelActions = new ActionGroupImpl (getZone ());
6 [4 n! L3 Z  t; |" m4 X. O: f+ g6 [: q
    try {
# ~7 g$ `5 B5 O5 w. L      modelActions.createActionTo$message
5 H- \' U+ N5 j        (heat, new Selector (heat.getClass (), "stepRule", false));
, C3 i. v. h7 K% U3 y9 k    } catch (Exception e) {* l; G" p# s0 Z4 O
      System.err.println ("Exception stepRule: " + e.getMessage ());
: {* m) a6 g9 b, B: J    }
2 D5 c. k2 U) ~9 S: O# x  d# I# s
    try {9 u  ~4 f( B3 Z! J) r2 a, i
      Heatbug proto = (Heatbug) heatbugList.get (0);1 X! K6 M* Y" M& D8 n
      Selector sel =
" _* j. v4 [# [- q6 C0 e" z; o+ {3 j2 `        new Selector (proto.getClass (), "heatbugStep", false);  X. L; ^; B) [$ i( I
      actionForEach =4 _  f$ k1 ^/ e: X  y$ w9 q
        modelActions.createFActionForEachHomogeneous$call
1 g+ [* b" G, t3 }        (heatbugList,
! D5 l$ m9 f% h3 C; f3 M4 ^( r         new FCallImpl (this, proto, sel,8 ^7 L  b; f' u- Q+ N
                        new FArgumentsImpl (this, sel)));
. f2 N! W0 G8 z& b9 s    } catch (Exception e) {2 H7 O6 Q* W& J; F- |+ d
      e.printStackTrace (System.err);
2 n! Y+ y6 D8 a0 t) J+ p5 A    }+ m( S: P" M! S  s
   
5 w8 r# R! L$ A8 O    syncUpdateOrder ();4 V- V7 @  j' ]8 J' l' ^1 u  J
2 }4 Q5 |2 |) @  C9 k% P% {# k
    try {: Q, i: V' x( w2 Y% I9 h) G2 C( G
      modelActions.createActionTo$message # D9 Q4 l$ ?, I# H. B
        (heat, new Selector (heat.getClass (), "updateLattice", false));
8 o- N/ Q7 b' u# ?7 o+ G! X9 L    } catch (Exception e) {0 f8 q& O( k8 i. w1 K+ o
      System.err.println("Exception updateLattice: " + e.getMessage ());
. O' F- h( K% X/ A    }
) f: v; @5 {' O) ]1 z        / S. F/ |  A8 f$ Q8 Q8 f
    // Then we create a schedule that executes the
. B$ T2 `8 x) Z    // modelActions. modelActions is an ActionGroup, by itself it. l, M# |' w6 I1 p* \, c4 g5 H
    // has no notion of time. In order to have it executed in( I% j) f. R7 g, X, j: w9 L/ p
    // time, we create a Schedule that says to use the
: l: ?8 Q- W0 g6 i3 p    // modelActions ActionGroup at particular times.  This
' c+ n3 _) `& {1 `; ^  v& P/ Y    // schedule has a repeat interval of 1, it will loop every
* E- W" @# n( s/ R2 @( x0 N8 f    // time step.  The action is executed at time 0 relative to. l) B. I6 x/ k, ]" I8 z% \
    // the beginning of the loop.  h: g5 l# M- \9 g# G0 o
- X2 [- T- R8 R+ u
    // This is a simple schedule, with only one action that is% _% S( M! |* v- m: [4 s! h
    // just repeated every time. See jmousetrap for more, M& V& b0 i$ G' L: c
    // complicated schedules.2 g! W3 c7 Y& P
  5 l) ^4 G4 z. l# Q
    modelSchedule = new ScheduleImpl (getZone (), 1);9 b0 I! g% q  ]7 v  p! Z+ [
    modelSchedule.at$createAction (0, modelActions);
( L# A1 {1 b+ m) @( t+ d        
9 y, e' O# N# \9 q' |    return this;
3 @" t# ], z  y  }
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