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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:/ r* |3 q/ @% v, r% @* V& W
7 Y- W; G( B' N. ]# G& [2 F) @
public Object buildActions () {& }/ z. ^8 v1 }
    super.buildActions();
8 j, h; }6 n9 p: X: g; V    / w8 F5 E3 E; a  b: r
    // Create the list of simulation actions. We put these in9 n, o6 K3 W& p/ u  r/ {6 ?
    // an action group, because we want these actions to be# Z! R& r+ F" f) w) Q  O6 b
    // executed in a specific order, but these steps should
2 Q: C6 b* W+ Q. e) n8 |! v2 C    // take no (simulated) time. The M(foo) means "The message
$ t3 Y( Y) J: l# b- c    // called <foo>". You can send a message To a particular
. v, I$ ]  f0 M2 w* G8 b( l. c( g    // object, or ForEach object in a collection.
" W" X' O9 l& o+ B; j1 n) `        $ M: y9 z+ N; ?2 r
    // Note we update the heatspace in two phases: first run
& [$ w) E# R& K( T& G$ Z    // diffusion, then run "updateWorld" to actually enact the/ J* f2 N$ i3 h$ N
    // changes the heatbugs have made. The ordering here is$ N/ F6 d% T  ~4 L" M& D3 s* s
    // significant!
7 k+ U& N0 B1 l0 S6 a: K        ) |2 z1 l: q- W; d& g: h
    // Note also, that with the additional  v' b4 ]4 A. R; i  Z' z
    // `randomizeHeatbugUpdateOrder' Boolean flag we can( ?7 i5 e' E3 g3 C- v- u
    // randomize the order in which the bugs actually run
5 l' c5 t. J' y& M" \    // their step rule.  This has the effect of removing any
+ \* F4 e: m' L/ E. d    // systematic bias in the iteration throught the heatbug
; A% R# l  U& C( _    // list from timestep to timestep. I7 ]7 _/ Q7 f4 c  d) j
        3 j# j/ g. W% g9 d
    // By default, all `createActionForEach' modelActions have
; C3 S7 U, p, I/ {! B7 @+ s    // a default order of `Sequential', which means that the
8 j& Z: {+ t! s, e" S    // order of iteration through the `heatbugList' will be8 i% Y: [6 Y4 Y/ v! g7 N+ W
    // identical (assuming the list order is not changed3 g; F0 `0 ~" O3 \
    // indirectly by some other process).! _# D3 i1 j. r* u1 t4 |
    * G6 c- g+ h& e8 y& [. j+ V
    modelActions = new ActionGroupImpl (getZone ());
) g2 l, `, ?1 J
6 X" m) s  C3 |* F9 r' W0 V1 q* G1 ]    try {
! j) I; O! f6 G( V* O5 q      modelActions.createActionTo$message
$ h% Z% m; J) G$ g        (heat, new Selector (heat.getClass (), "stepRule", false));
/ j- s% q+ ~$ n# l) |    } catch (Exception e) {1 Y$ B# N9 C: {
      System.err.println ("Exception stepRule: " + e.getMessage ());
* w* y/ a/ w# q2 \& t    }
# v$ W: n. f3 L# j  R& x4 ^( X* `3 o6 L1 o: j
    try {8 r. L) \% \' r
      Heatbug proto = (Heatbug) heatbugList.get (0);
) b2 ]1 _( U+ I8 l' n: ]0 V      Selector sel =
& n8 g- B0 T! X        new Selector (proto.getClass (), "heatbugStep", false);
( Y% t) F& U+ k( d      actionForEach =% t* |- Q7 @, C
        modelActions.createFActionForEachHomogeneous$call! D. d2 z3 z- v' O
        (heatbugList,8 o) D$ R& ~$ k9 m* j
         new FCallImpl (this, proto, sel,
4 {/ M& p. e" j  a3 V                        new FArgumentsImpl (this, sel)));
4 k# C; @1 W, z  P7 ^! C" a3 H' R8 v    } catch (Exception e) {/ Y3 y; v) f3 G4 w7 o7 b* H4 p
      e.printStackTrace (System.err);
) p$ O1 b. G; j% e, f    }/ B. x# V0 h+ `' q9 x+ A
   
  H% Y/ i+ Y- A9 s    syncUpdateOrder ();
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5 k% K4 R2 ~5 X6 g    try {9 ?& Y, J7 }- g  x: _0 m
      modelActions.createActionTo$message
9 F" h& P+ q5 F4 \4 }0 @        (heat, new Selector (heat.getClass (), "updateLattice", false));
5 I: v  N" _7 N$ F. z    } catch (Exception e) {
) |4 j1 U0 V/ y7 q& E! o8 J      System.err.println("Exception updateLattice: " + e.getMessage ());/ \' Q, O; Q7 E9 v4 \8 l9 h6 u
    }
/ d$ I( D$ Z. s8 X( }1 _% }1 O' p: i" I        
: x, b# X- n8 L1 F( f) F    // Then we create a schedule that executes the
, q* Q& a! K0 S, Q4 r" R/ W  R    // modelActions. modelActions is an ActionGroup, by itself it
; C3 Z% K7 e" M4 a    // has no notion of time. In order to have it executed in4 w& {( T3 E6 Q* l1 Y3 s* X2 e' ]# k+ @
    // time, we create a Schedule that says to use the0 c& A9 S: G2 ~5 }2 H7 R& e9 j
    // modelActions ActionGroup at particular times.  This% m% k# Y' x1 c. `9 i: b# b
    // schedule has a repeat interval of 1, it will loop every# K) c! k. E% [0 ]+ n- a
    // time step.  The action is executed at time 0 relative to$ p6 r1 f1 G! s! |' O4 P2 a3 Z
    // the beginning of the loop.& _9 S+ }3 z2 {- k6 d

) [  ^2 ~( @9 B- a* l" N- Y    // This is a simple schedule, with only one action that is2 M$ J- X! M) a+ f' W7 F9 q. ~; H
    // just repeated every time. See jmousetrap for more5 E. U6 t9 F0 _) j( ]; ?' C/ ]
    // complicated schedules.% b, A" [$ t( n" m
  
. ^/ t0 B: e' V/ Z- _    modelSchedule = new ScheduleImpl (getZone (), 1);
' R2 Y  I: ^. _$ _: [2 J    modelSchedule.at$createAction (0, modelActions);* o+ a1 i; A. D) m
          i- N: q/ C$ a8 d* R  W# t
    return this;- T  b% k* N3 E$ t4 g6 q, o! u
  }
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