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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:8 v! N* x5 ^6 |" i, d4 L7 H

, X) w* S' b  _9 h public Object buildActions () {4 {* u- F3 G& o- }2 d4 E# O* |
    super.buildActions();( `+ n+ m, e$ s5 J. E9 r" ]0 {) q
    - H( B' m2 [, T8 e0 W3 I
    // Create the list of simulation actions. We put these in
, p; Q, m1 i+ ]" }8 Q+ \( b. N    // an action group, because we want these actions to be
. @5 i! ^0 [2 z$ t    // executed in a specific order, but these steps should2 ?1 t0 y- V& I0 p( Q  R' G4 H$ U
    // take no (simulated) time. The M(foo) means "The message
# Z. f9 Q4 z& ?1 R/ M" r3 w  U    // called <foo>". You can send a message To a particular
; v) M( B: X. N& ~7 k( L5 `    // object, or ForEach object in a collection.
* M2 }" z6 z- S, C3 D        
6 z9 u- s& U* P" ^5 _    // Note we update the heatspace in two phases: first run5 Q6 q4 L* ~7 _/ U
    // diffusion, then run "updateWorld" to actually enact the
2 F! n& P( B0 z, _0 \# X0 ?2 f8 C    // changes the heatbugs have made. The ordering here is
) k( h, y$ o, `( n5 Q7 o! s7 m; U    // significant!% ]1 z: E  N1 m- K5 J% }  ?! N
        
% {) i' M3 j8 w9 [* d    // Note also, that with the additional
" V  P) ~, @+ C2 f: l7 y0 J% W    // `randomizeHeatbugUpdateOrder' Boolean flag we can
, ^# x+ P$ `" E    // randomize the order in which the bugs actually run
. {  \( T( l  v    // their step rule.  This has the effect of removing any
/ ?% n0 Y4 A' [    // systematic bias in the iteration throught the heatbug
% e! [3 J+ {* o# ?, `    // list from timestep to timestep
; s" j; F6 Q; J) g! K        
8 F" @  E) g% E. T2 e3 \+ F9 u/ j    // By default, all `createActionForEach' modelActions have% ^9 j1 G  p# a: _# E! W* ]
    // a default order of `Sequential', which means that the2 f1 T3 L& [! x) b7 v2 Y2 ^
    // order of iteration through the `heatbugList' will be6 A* u* C! b, K% d' W9 ^
    // identical (assuming the list order is not changed0 _& h$ r1 ~* Z1 Q" l* j5 a  [
    // indirectly by some other process).
, n! C+ Z% J: K7 \: X% U7 s8 y0 e' c   
( r6 W5 e' }/ D; }; u3 h: \    modelActions = new ActionGroupImpl (getZone ());7 W( r4 z& a( ^7 E1 U, M# O
# y% l9 X6 R; ^! @% S# e
    try {0 g8 u( \  h( ~3 I( g5 N1 J
      modelActions.createActionTo$message
4 {# V7 z' {% I/ Y        (heat, new Selector (heat.getClass (), "stepRule", false));
  q, A7 ~! t% ]0 I9 I& Y5 Y7 K1 c    } catch (Exception e) {
  {5 l7 f6 a8 p' Q      System.err.println ("Exception stepRule: " + e.getMessage ());
* M) d3 U. x. S: [. Y+ O: S8 d    }6 t& H/ U4 C" E4 Z  p9 Q0 o

. p, q2 r6 M, R" ?5 I6 ~' z    try {# E+ C' i1 r# I. @3 L' V" g8 n
      Heatbug proto = (Heatbug) heatbugList.get (0);$ n& _  ?% G5 {  }1 ]+ z! t: w
      Selector sel = 0 E3 S+ E/ |, X8 x9 @0 z
        new Selector (proto.getClass (), "heatbugStep", false);
4 i/ ?# M' |0 c- g      actionForEach =
& e4 H2 b% k4 P+ T        modelActions.createFActionForEachHomogeneous$call
( E8 g1 `8 D8 C  g9 M        (heatbugList," ^2 `5 C) [- R
         new FCallImpl (this, proto, sel,/ y( h) Y! u6 d7 I  T/ m
                        new FArgumentsImpl (this, sel)));
( x# r& A. F8 w; V8 R* D! W    } catch (Exception e) {
% t/ v/ B- v) E5 Y! `      e.printStackTrace (System.err);0 E/ f3 _* d. W8 @/ s
    }! G* }, O. x% f. H8 D) |
    2 T5 h, N4 _" w, v
    syncUpdateOrder ();+ ~- B; Z- ^$ G. p* z2 b) m
' u7 X7 p* K& o& U- O
    try {
' |! c* x: A) \! F      modelActions.createActionTo$message
5 N; R. ~4 T) E        (heat, new Selector (heat.getClass (), "updateLattice", false));
: h6 d, j. z& ?' Y/ _0 f    } catch (Exception e) {- [) Z/ v( j! G+ J2 Q% u0 q
      System.err.println("Exception updateLattice: " + e.getMessage ());1 O" U7 I7 f3 Y- O0 A
    }0 K% w* S" x: s  s* ]9 @4 V
        
4 z, j9 z6 y3 V    // Then we create a schedule that executes the
: @) y/ {4 J# `# L! L    // modelActions. modelActions is an ActionGroup, by itself it$ z( |- f: @* {5 @& ~. `. \
    // has no notion of time. In order to have it executed in% W; N, ^) J& @2 I. ^( _1 z
    // time, we create a Schedule that says to use the# {& }- K0 q; @, T
    // modelActions ActionGroup at particular times.  This
9 }# ]5 ]# ]8 O, @    // schedule has a repeat interval of 1, it will loop every9 R% k3 Z2 M' z, L+ D. V
    // time step.  The action is executed at time 0 relative to
6 N1 V0 ]) q: R* m# d    // the beginning of the loop.: W0 U2 c3 w$ U- N5 A1 X
. ^* }/ H  M9 {3 a) ^/ S1 s
    // This is a simple schedule, with only one action that is/ }7 o6 _1 g2 \2 W1 `% w0 D1 v/ V
    // just repeated every time. See jmousetrap for more
1 C- Q! i. U, V, t    // complicated schedules.
" Y! n) q6 _) f6 Q6 ^/ h. \$ S" g  2 s3 {: `( O4 {: Y& c
    modelSchedule = new ScheduleImpl (getZone (), 1);' y5 s  N1 _) U; M. _
    modelSchedule.at$createAction (0, modelActions);) ]. t# M. _7 ^0 ^' t9 M% {
        ( ]6 O1 d; l7 R+ U" B0 Q
    return this;$ c7 R) _$ l( o4 }, U3 z% U8 m. @
  }
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