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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:
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public Object buildActions () {
) E4 m$ i+ T4 l    super.buildActions();, M2 N+ g9 m# B5 U8 J
    5 a) t( h" }: }; r  t/ U9 r
    // Create the list of simulation actions. We put these in9 a  @1 L* {- V4 w
    // an action group, because we want these actions to be
! [) \1 J% a7 \8 e* V0 k( h    // executed in a specific order, but these steps should
0 P! K3 Y& x  P9 X9 U4 Q8 L2 R% k    // take no (simulated) time. The M(foo) means "The message
  X. ^9 Y3 ^1 ^: r9 q    // called <foo>". You can send a message To a particular
  ~$ k8 G9 w; Z+ g    // object, or ForEach object in a collection.
) x. i* u: p5 A1 \9 w- x! u* `! y        1 x; p; I  R8 m  V5 b" k
    // Note we update the heatspace in two phases: first run8 M' B+ `( l( c2 r
    // diffusion, then run "updateWorld" to actually enact the! `  W4 ?$ X- p$ B% ]7 @) B
    // changes the heatbugs have made. The ordering here is% J- T0 e2 o, g- x3 H  V4 k
    // significant!$ ?0 B2 B  E8 Z5 E8 _6 n
        ' S1 c% W! }5 s* r1 ^0 o3 z) w) `
    // Note also, that with the additional9 }3 o! Q5 f  N- K; w) |
    // `randomizeHeatbugUpdateOrder' Boolean flag we can! x! g7 _) T# o' x
    // randomize the order in which the bugs actually run
" y# q1 k& E  ~! y! L/ M" x    // their step rule.  This has the effect of removing any' _: p' D/ j& o( u) m0 {
    // systematic bias in the iteration throught the heatbug
" d8 a5 U% X7 y- g. u2 T* t2 z/ ~    // list from timestep to timestep6 J" w" x+ o" `0 z
        " U+ p/ Q. C6 r, Q- c9 ]) ^
    // By default, all `createActionForEach' modelActions have
# h" ^. c( C; ~! F    // a default order of `Sequential', which means that the
) g- ?) ?7 \- r2 \3 j: a    // order of iteration through the `heatbugList' will be
5 J5 J9 g, `8 y    // identical (assuming the list order is not changed
7 O3 i! J: R4 U: ~* f    // indirectly by some other process).0 z5 w  U% K# x" z! W  e6 ]
    + g$ M( `* R/ I- |0 q# O( J+ \& J
    modelActions = new ActionGroupImpl (getZone ());
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- _3 ~/ \# u6 n4 G. X    try {4 J  E" u# @6 A
      modelActions.createActionTo$message: d; J- u2 \( Z, b6 l
        (heat, new Selector (heat.getClass (), "stepRule", false));" v- X9 s+ ~1 ]( G% Q7 M8 w4 H; y
    } catch (Exception e) {' I& ?; h6 R/ G* ]0 d1 b
      System.err.println ("Exception stepRule: " + e.getMessage ());
( U  P; _, F0 C4 R7 N    }
$ X, Y+ V  _) Y. T6 h2 R
2 F0 ?3 k% }% w9 J    try {; z5 v- Q% K9 m; L
      Heatbug proto = (Heatbug) heatbugList.get (0);: {  p2 \5 j/ ^8 X, \1 c& E' Z
      Selector sel = ; B8 T: X; h7 ^& p; w/ B; q' c
        new Selector (proto.getClass (), "heatbugStep", false);- b" C! J2 }6 }$ m+ r
      actionForEach =2 ~- y: Y) t( c9 r3 K- C/ Z
        modelActions.createFActionForEachHomogeneous$call
; f) X2 L: R6 J, n        (heatbugList,2 G6 u" j9 M; O" r
         new FCallImpl (this, proto, sel,
4 ^" |# w, K: }: j" d                        new FArgumentsImpl (this, sel)));/ E. b6 h2 q: c6 t( c
    } catch (Exception e) {# m$ k: z. |) V3 c2 r1 P
      e.printStackTrace (System.err);4 n  i- C* w, A, b6 B
    }6 x5 L; D2 d; W
    2 Y; {3 M0 d( I" f( m. C
    syncUpdateOrder ();
5 Q/ ?# j, Z2 R' U" X1 `# U5 H1 ~# M, {7 e' Y/ ~# V: H$ c: \: v
    try {
& d5 ^' v6 ]7 N% a* {+ z! E; O      modelActions.createActionTo$message
2 X  p5 B. R" t4 Y  J5 F  B        (heat, new Selector (heat.getClass (), "updateLattice", false));
% Z# e& ?% e. p    } catch (Exception e) {
% i! O+ H: h: s7 A6 q' V      System.err.println("Exception updateLattice: " + e.getMessage ());
% Y; ^1 ?5 [6 c4 F9 [    }4 y9 S' O& S9 @- E4 s, b
        
( x; ?' Y( W2 N& b$ H( p    // Then we create a schedule that executes the
4 [4 [- h1 a$ O( z  s1 x( w    // modelActions. modelActions is an ActionGroup, by itself it
% m  W8 t' Q' y2 Z+ ?0 a3 C    // has no notion of time. In order to have it executed in
$ W$ m$ s4 m7 Z$ D! E, f( Y5 I    // time, we create a Schedule that says to use the
0 I! a: a5 ?: R$ C    // modelActions ActionGroup at particular times.  This% C5 K# d8 h! x9 S2 e) W  w, v0 Y
    // schedule has a repeat interval of 1, it will loop every/ T) Y9 s2 u/ W. O
    // time step.  The action is executed at time 0 relative to- e! {/ n/ K6 l
    // the beginning of the loop.2 Z+ N* V* ^, |! K$ K3 L

: p6 O9 u" C, A0 [% l. L! Y/ s6 K    // This is a simple schedule, with only one action that is9 t" I; |9 N: G) n( F7 C$ {
    // just repeated every time. See jmousetrap for more
6 \. F. |5 ^+ t    // complicated schedules.
8 L1 r/ w3 r' _: N  + y4 f8 [9 V2 d
    modelSchedule = new ScheduleImpl (getZone (), 1);8 J, c8 G. w8 p8 Z8 V0 s: C
    modelSchedule.at$createAction (0, modelActions);
, T2 f4 P2 W3 @5 ~& @! T0 f        6 K' O* s: C3 s+ l) n9 u
    return this;& K2 F( b1 D! E8 [, F1 X
  }
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