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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 @! ?& j0 U8 r* Z, L! c6 m

: i0 `5 y' ?0 J# \ public Object buildActions () {
2 u6 p( V% d0 c+ a    super.buildActions();: q4 m- {# {% S2 a
    8 t2 }9 F4 S" d2 U! h% t! g7 ^
    // Create the list of simulation actions. We put these in
4 F* O& h9 y( E& I/ ^3 s4 U$ n# f    // an action group, because we want these actions to be
" d0 x0 h; w1 H, W2 W  o* P  U    // executed in a specific order, but these steps should. |" t$ |8 w" b7 F% M2 z1 s: B
    // take no (simulated) time. The M(foo) means "The message
% o9 L, q  j$ G3 r& O9 e4 S- q    // called <foo>". You can send a message To a particular9 L8 h. K; A3 R, O
    // object, or ForEach object in a collection.; C; x& f. v2 {: L
        
4 X2 a; W6 c. W0 ]5 D    // Note we update the heatspace in two phases: first run! `- S: P5 u* w+ E
    // diffusion, then run "updateWorld" to actually enact the
6 l) E& \3 b2 y% T& F: b1 j    // changes the heatbugs have made. The ordering here is
# F" Z" n0 f8 R/ r1 d8 ^0 K1 m    // significant!# ?+ c! P$ T4 L; o
        ' N2 J' u1 ^  Z0 D$ P5 Q& P
    // Note also, that with the additional
: l% k# Z( A( [' Q9 D* n8 H! @0 ?% r    // `randomizeHeatbugUpdateOrder' Boolean flag we can  r4 ?" H  C2 D. e4 m6 c
    // randomize the order in which the bugs actually run
' r8 i1 \1 U2 n7 S    // their step rule.  This has the effect of removing any
: X3 U+ h4 d8 D$ W6 v    // systematic bias in the iteration throught the heatbug* y, d, y% s5 G) k
    // list from timestep to timestep/ @" b4 I6 Q7 ^; b1 Y$ z
        
( Z, R3 J- b6 f8 e    // By default, all `createActionForEach' modelActions have; W; D9 e# v3 ]& P( p
    // a default order of `Sequential', which means that the
! W3 @* L1 r* @  P. U' w    // order of iteration through the `heatbugList' will be
8 u4 W3 @; M" B1 Z; E5 o1 w    // identical (assuming the list order is not changed( f7 ?: v% P, I: Y* a. s
    // indirectly by some other process)./ l6 C  l5 k! K+ R  p& |
    0 F6 T7 o8 ?4 }- e# Q
    modelActions = new ActionGroupImpl (getZone ());
% m; x# {6 K8 z  g3 Z
& R1 h( _. t3 Y  X- |    try {
8 t+ \; A& v3 C9 f      modelActions.createActionTo$message2 s) H+ k4 P+ I
        (heat, new Selector (heat.getClass (), "stepRule", false));
$ B' [! q& Z4 x3 r8 O, n    } catch (Exception e) {
+ J0 B. k( a6 S# _) Y, j      System.err.println ("Exception stepRule: " + e.getMessage ());5 @" O2 f" ~% ^) E5 i
    }# i& f" d2 ]' z+ ~5 V3 }
5 b* r$ ~; ~& p) _8 X2 G
    try {
9 [4 d1 G1 S& g# U  N" G7 y1 H# ]      Heatbug proto = (Heatbug) heatbugList.get (0);
. k* ]2 x+ w, D% s4 w, d8 g      Selector sel = 5 u' x* U) @. F
        new Selector (proto.getClass (), "heatbugStep", false);0 F  }* ?( ^: W7 p  _0 r
      actionForEach =! q9 V& q2 g5 Z4 k8 M
        modelActions.createFActionForEachHomogeneous$call
' U& N- Z! p7 }+ c" v' a        (heatbugList,
3 U3 h5 q5 O, O) _$ S* s         new FCallImpl (this, proto, sel,6 m' O0 @5 ?' t# v+ B( w, G' ?( p
                        new FArgumentsImpl (this, sel)));2 ~. \; e& X: H) ]$ u/ @; X' K1 @7 i
    } catch (Exception e) {, I1 s4 `# Y, ]# ^/ z) ?) A7 G  w
      e.printStackTrace (System.err);
' h* R/ ]/ C8 b& k# ~) Y$ e( u: h$ X    }
1 z7 l- r$ F  h0 T  o- P( B% L. u   
1 J+ g0 \9 T- c- N7 C2 W    syncUpdateOrder ();7 x2 L& W3 ~+ S  l! p' I

$ Z( ]. V' d+ q) J$ B  q    try {
, Q( D3 o" `' `      modelActions.createActionTo$message + a9 E& E3 n. @8 l
        (heat, new Selector (heat.getClass (), "updateLattice", false));/ |# R  g2 }& u9 ^0 r! S1 R: _# t* ?
    } catch (Exception e) {
  f5 ~* A* l+ O& B+ Q; u$ O      System.err.println("Exception updateLattice: " + e.getMessage ());, J# A% F; i) e& M' M, R! O
    }
- L+ ~5 m8 E' [        1 O3 D% \1 K' a3 P! l! c' z: r. a
    // Then we create a schedule that executes the
/ D: e5 O) j" e  D4 J) R8 R. E    // modelActions. modelActions is an ActionGroup, by itself it
# R8 N0 K0 Y% H7 p    // has no notion of time. In order to have it executed in
  f" i. X% ?1 V; q2 H    // time, we create a Schedule that says to use the
8 s* m& w0 O- y8 C+ W    // modelActions ActionGroup at particular times.  This
; _/ y9 i. h1 `) s* J. S    // schedule has a repeat interval of 1, it will loop every9 h# D/ Q7 d" A; v" d
    // time step.  The action is executed at time 0 relative to' k( A7 u" r6 v! c+ j0 S
    // the beginning of the loop.
& E5 T, W% ~6 L5 e4 Z  y- u/ I* K7 g9 q5 g; X
    // This is a simple schedule, with only one action that is& U/ t" S! l( O- b
    // just repeated every time. See jmousetrap for more
6 i- v+ U+ `& K, |    // complicated schedules.
" h6 G3 Y6 a2 `3 T" E8 Y  
7 j6 y# U/ O; D, H% w' d7 Z8 }    modelSchedule = new ScheduleImpl (getZone (), 1);
) P- r- {' ?* \+ R  C( H    modelSchedule.at$createAction (0, modelActions);
/ z% K* Z9 y7 q- ^" ~        % Q& W4 _  `' l
    return this;
# t9 r* }, o9 R* C% c* ]6 Y  }
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